webogram-i2p/app/js/messages_manager.js

/*!
 * Webogram v0.5.4 - messaging web application for MTProto
 * https://github.com/zhukov/webogram
 * Copyright (C) 2014 Igor Zhukov <igor.beatle@gmail.com>
 * https://github.com/zhukov/webogram/blob/master/LICENSE
 */

'use strict';

angular.module('myApp.services')

.service('AppMessagesManager', function ($q, $rootScope, $location, $filter, $timeout, $sce, ApiUpdatesManager, AppUsersManager, AppChatsManager, AppPeersManager, AppPhotosManager, AppDocsManager, AppStickersManager, AppMessagesIDsManager, DraftsManager, AppWebPagesManager, MtpApiManager, MtpApiFileManager, ServerTimeManager, RichTextProcessor, NotificationsManager, Storage, AppProfileManager, TelegramMeWebService, ErrorService, StatusManager, _) {

  var messagesStorage = {};
  var messagesForHistory = {};
  var messagesForDialogs = {};
  var historiesStorage = {};
  var dialogsStorage = {count: null, dialogs: []};
  var pendingByRandomID = {};
  var pendingByMessageID = {};
  var pendingAfterMsgs = {};
  var sendFilePromise = $q.when();
  var tempID = -1;

  var dialogsIndex = SearchIndexManager.createIndex(),
      cachedResults = {query: false};

  var lastSearchFilter = {},
      lastSearchResults = [];

  var needSingleMessages = [],
      fetchSingleMessagesTimeout = false;

  var incrementedMessageViews = {},
      needIncrementMessageViews = [],
      incrementMessageViewsTimeout = false;

  var maxSeenID = false;
  if (Config.Modes.packed) {
    Storage.get('max_seen_msg').then(function (maxID) {
      maxSeenID = maxID || 0;
    });
  }


  var dateOrTimeFilter = $filter('dateOrTime');
  var fwdMessagesPluralize = _.pluralize('conversation_forwarded_X_messages');

  NotificationsManager.start();

  var allDialogsLoaded = false
  var dialogsOffsetDate = 0;
  var dialogsNum = 0;

  var migratedFromTo = {};
  var migratedToFrom = {};

  function getConversations (query, offsetIndex, limit) {
    var curDialogStorage = dialogsStorage;
    var isSearch = angular.isString(query) && query.length;

    if (isSearch) {
      if (!limit || cachedResults.query !== query) {
        cachedResults.query = query;

        var results = SearchIndexManager.search(query, dialogsIndex);

        cachedResults.dialogs = [];
        angular.forEach(dialogsStorage.dialogs, function (dialog) {
          if (results[dialog.peerID]) {
            cachedResults.dialogs.push(dialog);
          }
        });
        cachedResults.count = cachedResults.dialogs.length;
      }
      curDialogStorage = cachedResults;
    } else {
      cachedResults.query = false;
    }

    var offset = 0;
    if (offsetIndex > 0) {
      for (offset = 0; offset < curDialogStorage.dialogs.length; offset++) {
        if (offsetIndex > curDialogStorage.dialogs[offset].index) {
          break;
        }
      }
    }

    limit = limit || 20;

    if (
      isSearch ||
      allDialogsLoaded ||
      curDialogStorage.dialogs.length >= offset + limit
    ) {
      return $q.when({
        dialogs: curDialogStorage.dialogs.slice(offset, offset + limit)
      });
    }

    return getTopMessages(limit).then(function () {
      offset = 0;
      if (offsetIndex > 0) {
        for (offset = 0; offset < curDialogStorage.dialogs.length; offset++) {
          if (offsetIndex > curDialogStorage.dialogs[offset].index) {
            break;
          }
        }
      }
      return {
        dialogs: curDialogStorage.dialogs.slice(offset, offset + limit)
      }
    });
  }

  function getDialogByPeerID (peerID) {
    for (var i = 0; i < dialogsStorage.dialogs.length; i++) {
      if (dialogsStorage.dialogs[i].peerID == peerID) {
        return [dialogsStorage.dialogs[i], i];
      }
    }

    return [];
  }

  function saveConversation (dialog) {
    var peerID = AppPeersManager.getPeerID(dialog.peer);
    if (!peerID) {
      return false;
    }
    var channelID = AppPeersManager.isChannel(peerID) ? -peerID : 0;
    var peerText = AppPeersManager.getPeerSearchText(peerID);
    SearchIndexManager.indexObject(peerID, peerText, dialogsIndex);

    var isMegagroup = AppPeersManager.isMegagroup(channelID);
    var mid = AppMessagesIDsManager.getFullMessageID(dialog.top_message, channelID);
    var message = getMessage(mid);
    var offsetDate = message.date;

    if (!channelID && peerID < 0) {
      var chat = AppChatsManager.getChat(-peerID);
      if (chat && chat.migrated_to && chat.pFlags.deactivated) {
        var migratedToPeer = AppPeersManager.getPeerID(chat.migrated_to);
        migratedFromTo[peerID] = migratedToPeer;
        migratedToFrom[migratedToPeer] = peerID;
        return;
      }
    }

    dialog.top_message = mid;
    dialog.read_inbox_max_id = AppMessagesIDsManager.getFullMessageID(dialog.read_inbox_max_id, channelID);
    dialog.read_outbox_max_id = AppMessagesIDsManager.getFullMessageID(dialog.read_outbox_max_id, channelID);

    var topDate = message.date;
    if (channelID) {
      var channel = AppChatsManager.getChat(channelID);
      if (!topDate || channel.date && channel.date > topDate) {
        topDate = channel.date;
      }
    }
    var savedDraft = DraftsManager.saveDraft(peerID, dialog.draft);
    if (savedDraft && savedDraft.date > topDate) {
      topDate = savedDraft.date;
    }

    dialog.index = generateDialogIndex(topDate);
    dialog.peerID = peerID;

    pushDialogToStorage(dialog, offsetDate);

    // Because we saved message without dialog present
    var unreadKey = message.pFlags.out ? 'read_outbox_max_id' : 'read_inbox_max_id';
    if (message.mid && message.mid > dialog[unreadKey]) {
      message.pFlags.unread = true;
    }

    if (historiesStorage[peerID] === undefined &&
        !message.deleted) {
      var historyStorage = {count: null, history: [mid], pending: []};
      historiesStorage[peerID] = historyStorage;
      if (mergeReplyKeyboard(historyStorage, message)) {
        $rootScope.$broadcast('history_reply_markup', {peerID: peerID});
      }
    }

    NotificationsManager.savePeerSettings(peerID, dialog.notify_settings);

    if (channelID && dialog.pts) {
      ApiUpdatesManager.addChannelState(channelID, dialog.pts);
    }

    if (
      !channelID &&
      dialog.unread_count > 0 &&
      maxSeenID &&
      dialog.top_message > maxSeenID
    ) {
      var notifyPeer = message.flags & 16 ? message.from_id : peerID;
      if (message.pFlags.unread &&
          !message.pFlags.out &&
          !message.pFlags.silent) {
        NotificationsManager.getPeerMuted(notifyPeer).then(function (muted) {
          if (!muted) {
            notifyAboutMessage(message);
          }
        });
      }
    }
  }

  function getTopMessages (limit) {
    var first = true;
    var dialogs = dialogsStorage.dialogs;
    var offsetDate = 0;
    var offsetID = 0;
    var offsetPeerID = 0;
    if (dialogsOffsetDate) {
      offsetDate = dialogsOffsetDate + ServerTimeManager.serverTimeOffset;
    }
    return MtpApiManager.invokeApi('messages.getDialogs', {
      offset_date: offsetDate,
      offset_id: AppMessagesIDsManager.getMessageLocalID(offsetID),
      offset_peer: AppPeersManager.getInputPeerByID(offsetPeerID),
      limit: limit
    }, {
      timeout: 300
    }).then(function (dialogsResult) {
      if (!offsetDate) {
        TelegramMeWebService.setAuthorized(true);
      }

      AppUsersManager.saveApiUsers(dialogsResult.users);
      AppChatsManager.saveApiChats(dialogsResult.chats);
      saveMessages(dialogsResult.messages);

      var maxSeenIdIncremented = offsetDate ? true : false;
      angular.forEach(dialogsResult.dialogs, function (dialog) {
        saveConversation(dialog);

        if (!maxSeenIdIncremented &&
            !AppPeersManager.isChannel(AppPeersManager.getPeerID(dialog.peer))) {
          incrementMaxSeenID(dialog.top_message);
          maxSeenIdIncremented = true;
        }
      });

      if (!dialogsResult.dialogs.length ||
          !dialogsResult.count ||
          dialogs.length >= dialogsResult.count) {
        allDialogsLoaded = true;
      }
    });
  }

  function generateDialogIndex (date) {
    if (date === undefined) {
      date = tsNow(true) + ServerTimeManager.serverTimeOffset;
    }
    return (date * 0x10000) + ((++dialogsNum) & 0xFFFF);
  }

  function pushDialogToStorage (dialog, offsetDate) {
    if (offsetDate && (!dialogsOffsetDate || offsetDate < dialogsOffsetDate)) {
      dialogsOffsetDate = offsetDate;
    }
    var dialogs = dialogsStorage.dialogs;
    var pos = getDialogByPeerID(dialog.peerID)[1];
    if (pos !== undefined) {
      dialogs.splice(pos, 1);
    }

    var index = dialog.index;
    var i, len = dialogs.length;
    if (!len || index < dialogs[len - 1].index) {
      dialogs.push(dialog);
    }
    else if (index >= dialogs[0].index) {
      dialogs.unshift(dialog);
    }
    else {
      for (i = 0; i < len; i++) {
        if (index > dialogs[i].index) {
          dialogs.splice(i, 0, dialog);
          break;
        }
      }
    }
  }

  function requestHistory (peerID, maxID, limit, offset) {
    var isChannel = AppPeersManager.isChannel(peerID);
    var isMegagroup = isChannel && AppPeersManager.isMegagroup(peerID);

    return MtpApiManager.invokeApi('messages.getHistory', {
      peer: AppPeersManager.getInputPeerByID(peerID),
      offset_id: maxID ? AppMessagesIDsManager.getMessageLocalID(maxID) : 0,
      add_offset: offset || 0,
      limit: limit || 0
    }, {
      timeout: 300,
      noErrorBox: true
    }).then(function (historyResult) {
      AppUsersManager.saveApiUsers(historyResult.users);
      AppChatsManager.saveApiChats(historyResult.chats);
      saveMessages(historyResult.messages);

      if (isChannel) {
        ApiUpdatesManager.addChannelState(-peerID, historyResult.pts);
      }

      var length = historyResult.messages.length;
      if (length &&
          historyResult.messages[length - 1].deleted) {
        historyResult.messages.splice(length - 1, 1);
        length--;
        historyResult.count--;
      }

      if (
        peerID < 0 ||
        !AppUsersManager.isBot(peerID) ||
        (length == limit && limit < historyResult.count)
      ) {
        return historyResult;
      }

      return AppProfileManager.getProfile(peerID).then(function (userFull) {
        var description = userFull.bot_info && userFull.bot_info.description;
        if (description) {
          var messageID = tempID--;
          var message = {
            _: 'messageService',
            id: messageID,
            from_id: peerID,
            to_id: AppPeersManager.getOutputPeer(peerID),
            flags: 0,
            pFlags: {},
            date: tsNow(true) + ServerTimeManager.serverTimeOffset,
            action: {
              _: 'messageActionBotIntro',
              description: description
            }
          };
          saveMessages([message]);
          historyResult.messages.push(message);
          if (historyResult.count) {
            historyResult.count++;
          }
        }
        return historyResult;
      });
    }, function (error) {
      switch (error.type) {
        case 'CHANNEL_PRIVATE':
          var channel = AppChatsManager.getChat(-peerID);
          channel = {_: 'channelForbidden', access_hash: channel.access_hash, title: channel.title};
          ApiUpdatesManager.processUpdateMessage({
            _: 'updates',
            updates: [{
              _: 'updateChannel',
              channel_id: -peerID
            }],
            chats: [channel],
            users: []
          });
          break;
      }
      return $q.reject(error);
    });
  }

  function fillHistoryStorage (peerID, maxID, fullLimit, historyStorage) {
    // console.log('fill history storage', peerID, maxID, fullLimit, angular.copy(historyStorage));
    var offset = (migratedFromTo[peerID] && !maxID) ? 1 : 0;
    return requestHistory(peerID, maxID, fullLimit, offset).then(function (historyResult) {
      historyStorage.count = historyResult.count || historyResult.messages.length;

      var offset = 0;
      if (!maxID && historyResult.messages.length) {
        maxID = historyResult.messages[0].mid + 1;
      }
      if (maxID > 0) {
        for (offset = 0; offset < historyStorage.history.length; offset++) {
          if (maxID > historyStorage.history[offset]) {
            break;
          }
        }
      }

      var wasTotalCount = historyStorage.history.length;

      historyStorage.history.splice(offset, historyStorage.history.length - offset);
      angular.forEach(historyResult.messages, function (message) {
        if (mergeReplyKeyboard(historyStorage, message)) {
          $rootScope.$broadcast('history_reply_markup', {peerID: peerID});
        }
        historyStorage.history.push(message.mid);
      });

      var totalCount = historyStorage.history.length;
      fullLimit -= (totalCount - wasTotalCount);

      var migratedNextPeer = migratedFromTo[peerID];
      var migratedPrevPeer = migratedToFrom[peerID];
      var isMigrated = migratedNextPeer !== undefined || migratedPrevPeer !== undefined;

      if (isMigrated) {
        historyStorage.count = Math.max(historyStorage.count, totalCount) + 1;
      }

      if (fullLimit > 0) {
        maxID = historyStorage.history[totalCount - 1];
        if (isMigrated) {
          if (!historyResult.messages.length) {
            if (migratedPrevPeer) {
              maxID = 0;
              peerID = migratedPrevPeer;
            } else {
              historyStorage.count = totalCount;
              return true;
            }
          }
          return fillHistoryStorage(peerID, maxID, fullLimit, historyStorage);
        }
        else if (totalCount < historyStorage.count) {
          return fillHistoryStorage(peerID, maxID, fullLimit, historyStorage);
        }
      }
      return true;
    });
  };

  function wrapHistoryResult (peerID, result) {
    var unreadOffset = result.unreadOffset;
    if (unreadOffset) {
      var i, message;
      for (i = result.history.length - 1; i >= 0; i--) {
        message = messagesStorage[result.history[i]];
        if (message && !message.pFlags.out && message.pFlags.unread) {
          result.unreadOffset = i + 1;
          break;
        }
      }
    }
    return $q.when(result);
  }

  function migrateChecks (migrateFrom, migrateTo) {
    if (!migratedFromTo[migrateFrom] &&
        !migratedToFrom[migrateTo] &&
        AppChatsManager.hasChat(-migrateTo)) {

      var fromChat = AppChatsManager.getChat(-migrateFrom);
      if (fromChat &&
          fromChat.migrated_to &&
          fromChat.migrated_to.channel_id == -migrateTo) {
        migratedFromTo[migrateFrom] = migrateTo;
        migratedToFrom[migrateTo] = migrateFrom;

        $timeout(function () {
          var foundDialog = getDialogByPeerID(migrateFrom);
          if (foundDialog.length) {
            dialogsStorage.dialogs.splice(foundDialog[1], 1);
            $rootScope.$broadcast('dialog_drop', {peerID: migrateFrom});
          }
          $rootScope.$broadcast('dialog_migrate', {migrateFrom: migrateFrom, migrateTo: migrateTo});
        }, 100);
      }
    }
  }

  function convertMigratedPeer (peerID) {
    if (migratedFromTo[peerID]) {
      return migratedFromTo[peerID];
    }
  }

  function getHistory (peerID, maxID, limit, backLimit, prerendered) {
    if (migratedFromTo[peerID]) {
      peerID = migratedFromTo[peerID];
    }
    var historyStorage = historiesStorage[peerID],
        offset = 0,
        offsetNotFound = false,
        unreadOffset = false,
        unreadSkip = false;

    prerendered = prerendered ? Math.min(50, prerendered) : 0;

    if (historyStorage === undefined) {
      historyStorage = historiesStorage[peerID] = {count: null, history: [], pending: []};
    }

    var isMigrated = false;
    var reqPeerID = peerID;
    if (migratedToFrom[peerID]) {
      isMigrated = true;
      if (maxID && maxID < fullMsgIDModulus) {
        reqPeerID = migratedToFrom[peerID];
      }
    }

    if (!limit && !maxID) {
      var foundDialog = getDialogByPeerID(peerID)[0];
      if (foundDialog && foundDialog.unread_count > 1) {
        var unreadCount = foundDialog.unread_count;
        if (unreadSkip = (unreadCount > 50)) {
          if (foundDialog.read_inbox_max_id) {
            maxID = foundDialog.read_inbox_max_id;
            backLimit = 16;
            unreadOffset = 16;
            limit = 4;
          } else {
            limit = 20;
            unreadOffset = 16;
            offset = unreadCount - unreadOffset;
          }
        } else {
          limit = Math.max(10, prerendered, unreadCount + 2);
          unreadOffset = unreadCount;
        }
      }
      else if (Config.Mobile) {
        limit = 20;
      }
    }
    if (maxID > 0) {
      offsetNotFound = true;
      for (offset = 0; offset < historyStorage.history.length; offset++) {
        if (maxID > historyStorage.history[offset]) {
          offsetNotFound = false;
          break;
        }
      }
    }

    if (!offsetNotFound && (
          historyStorage.count !== null && historyStorage.history.length == historyStorage.count ||
          historyStorage.history.length >= offset + (limit || 1)
    )) {
      if (backLimit) {
        backLimit = Math.min(offset, backLimit);
        offset = Math.max(0, offset - backLimit);
        limit += backLimit;
      } else {
        limit = limit || (offset ? 20 : (prerendered || 5));
      }
      var history = historyStorage.history.slice(offset, offset + limit);
      if (!maxID && historyStorage.pending.length) {
        history = historyStorage.pending.slice().concat(history);
      }
      return wrapHistoryResult(peerID, {
        count: historyStorage.count,
        history: history,
        unreadOffset: unreadOffset,
        unreadSkip: unreadSkip
      });
    }

    if (!backLimit && !limit) {
      limit = prerendered || 20;
    }
    if (offsetNotFound) {
      offset = 0;
    }
    if (backLimit || unreadSkip || maxID && historyStorage.history.indexOf(maxID) == -1) {
      if (backLimit) {
        offset = -backLimit;
        limit += backLimit;
      }
      return requestHistory(reqPeerID, maxID, limit, offset).then(function (historyResult) {
        historyStorage.count = historyResult.count || historyResult.messages.length;
        if (isMigrated) {
          historyStorage.count++;
        }

        var history = [];
        angular.forEach(historyResult.messages, function (message) {
          history.push(message.mid);
        });
        if (!maxID && historyStorage.pending.length) {
          history = historyStorage.pending.slice().concat(history);
        }

        return wrapHistoryResult(peerID, {
          count: historyStorage.count,
          history: history,
          unreadOffset: unreadOffset,
          unreadSkip: unreadSkip
        });
      })
    }

    return fillHistoryStorage(peerID, maxID, limit, historyStorage).then(function () {
      offset = 0;
      if (maxID > 0) {
        for (offset = 0; offset < historyStorage.history.length; offset++) {
          if (maxID > historyStorage.history[offset]) {
            break;
          }
        }
      }

      var history = historyStorage.history.slice(offset, offset + limit);
      if (!maxID && historyStorage.pending.length) {
        history = historyStorage.pending.slice().concat(history);
      }

      return wrapHistoryResult(peerID, {
        count: historyStorage.count,
        history: history,
        unreadOffset: unreadOffset,
        unreadSkip: unreadSkip
      });
    });
  }

  function getReplyKeyboard (peerID) {
    return (historiesStorage[peerID] || {}).reply_markup || false;
  }

  function mergeReplyKeyboard (historyStorage, message) {
    // console.log('merge', message.mid, message.reply_markup, historyStorage.reply_markup);
    if (!message.reply_markup &&
        !message.pFlags.out &&
        !message.action) {
      return false;
    }
    if (message.reply_markup &&
        message.reply_markup._ == 'replyInlineMarkup') {
      return false;
    }
    var messageReplyMarkup = message.reply_markup;
    var lastReplyMarkup = historyStorage.reply_markup;
    if (messageReplyMarkup) {
      if (lastReplyMarkup && lastReplyMarkup.mid >= message.mid) {
        return false;
      }
      if (messageReplyMarkup.pFlags.selective &&
          !(message.flags & 16)) {
        return false;
      }
      if (historyStorage.maxOutID &&
          message.mid < historyStorage.maxOutID &&
          messageReplyMarkup.pFlags.single_use) {
        messageReplyMarkup.pFlags.hidden = true;
      }
      messageReplyMarkup = angular.extend({
        mid: message.mid
      }, messageReplyMarkup);
      if (messageReplyMarkup._ != 'replyKeyboardHide') {
        messageReplyMarkup.fromID = message.from_id;
      }
      historyStorage.reply_markup = messageReplyMarkup;
      // console.log('set', historyStorage.reply_markup);
      return true;
    }

    if (message.pFlags.out) {
      if (lastReplyMarkup) {
        if (lastReplyMarkup.pFlags.single_use &&
            !lastReplyMarkup.pFlags.hidden &&
            (message.mid > lastReplyMarkup.mid || message.mid < 0) &&
            message.message) {
          lastReplyMarkup.pFlags.hidden = true;
          // console.log('set', historyStorage.reply_markup);
          return true;
        }
      } else if (!historyStorage.maxOutID ||
                  message.mid > historyStorage.maxOutID) {
        historyStorage.maxOutID = message.mid;
      }
    }

    if (message.action &&
        message.action._ == 'messageActionChatDeleteUser' &&
        (lastReplyMarkup
          ? message.action.user_id == lastReplyMarkup.fromID
          : AppUsersManager.isBot(message.action.user_id)
        )
      ) {
      historyStorage.reply_markup = {
        _: 'replyKeyboardHide',
        mid: message.mid,
        flags: 0,
        pFlags: {}
      };
      // console.log('set', historyStorage.reply_markup);
      return true;
    }

    return false;
  }

  function getSearch (peerID, query, inputFilter, maxID, limit) {
    var foundMsgs = [],
        useSearchCache = !query,
        newSearchFilter = {peer: peerID, filter: inputFilter},
        sameSearchCache = useSearchCache && angular.equals(lastSearchFilter, newSearchFilter);

    if (useSearchCache && !sameSearchCache) {
      lastSearchFilter = newSearchFilter;
      lastSearchResults = [];
    }

    if (peerID && !maxID && !query) {
      var historyStorage = historiesStorage[peerID];

      if (historyStorage !== undefined && historyStorage.history.length) {
        var neededContents = {},
            neededDocType,
            neededLimit = limit || 20,
            i, message;

        switch (inputFilter._) {
          case 'inputMessagesFilterPhotos':
            neededContents['messageMediaPhoto'] = true;
            break;

          case 'inputMessagesFilterPhotoVideo':
            neededContents['messageMediaPhoto'] = true;
            neededContents['messageMediaDocument'] = true;
            neededDocType = 'video';
            break;

          case 'inputMessagesFilterVideo':
            neededContents['messageMediaDocument'] = true;
            neededDocType = 'video';
            break;

          case 'inputMessagesFilterDocument':
            neededContents['messageMediaDocument'] = true;
            neededDocType = false;
            break;

          case 'inputMessagesFilterVoice':
            neededContents['messageMediaDocument'] = true;
            neededDocType = 'voice';
            break;
        }
        for (i = 0; i < historyStorage.history.length; i++) {
          message = messagesStorage[historyStorage.history[i]];
          if (message.media && neededContents[message.media._]) {
            if (neededDocType !== undefined &&
                message.media._ == 'messageMediaDocument' &&
                message.media.document.type != neededDocType) {
              continue;
            }
            foundMsgs.push(message.mid);
            if (foundMsgs.length >= neededLimit) {
              break;
            }
          }
        }
      }

      // console.log(dT(), sameSearchCache, foundMsgs, lastSearchResults);
      if (foundMsgs.length < neededLimit && lastSearchResults.length && sameSearchCache) {
        var minID = foundMsgs.length ? foundMsgs[foundMsgs.length - 1] : 0xFFFFFFFF;
        for (var i = 0; i < lastSearchResults.length; i++) {
          if (lastSearchResults[i] < minID) {
            foundMsgs.push(lastSearchResults[i]);
            if (foundMsgs.length >= neededLimit) {
              break;
            }
          }
        }
      }
      // console.log(dT(), foundMsgs);
    }

    if (foundMsgs.length || limit == 1000) {
      if (useSearchCache) {
        lastSearchResults = listMergeSorted(lastSearchResults, foundMsgs);
      }

      return $q.when({
        count: null,
        history: foundMsgs
      });
    }

    var apiPromise;

    if (peerID || !query) {
      var flags = 0;
      if (AppPeersManager.isChannel(peerID) &&
          !AppPeersManager.isMegagroup(peerID)) {
        flags |= 1;
      }
      apiPromise = MtpApiManager.invokeApi('messages.search', {
        flags: flags,
        peer: AppPeersManager.getInputPeerByID(peerID),
        q: query || '',
        filter: inputFilter || {_: 'inputMessagesFilterEmpty'},
        min_date: 0,
        max_date: 0,
        limit: limit || 20,
        max_id: maxID || 0
      }, {
        timeout: 300,
        noErrorBox: true
      });
    } else {
      var offsetDate = 0;
      var offsetPeerID = 0;
      var offsetID = 0;
      var offsetMessage = maxID && getMessage(maxID);

      if (offsetMessage && offsetMessage.date) {
        offsetDate = offsetMessage.date + ServerTimeManager.serverTimeOffset;
        offsetID = offsetMessage.id;
        offsetPeerID = getMessagePeer(offsetMessage);
      }
      apiPromise = MtpApiManager.invokeApi('messages.searchGlobal', {
        q: query,
        offset_date: offsetDate,
        offset_peer: AppPeersManager.getInputPeerByID(offsetPeerID),
        offset_id: AppMessagesIDsManager.getMessageLocalID(offsetID),
        limit: limit || 20
      }, {
        timeout: 300,
        noErrorBox: true
      });
    }

    return apiPromise.then(function (searchResult) {
      AppUsersManager.saveApiUsers(searchResult.users);
      AppChatsManager.saveApiChats(searchResult.chats);
      saveMessages(searchResult.messages);

      var foundCount = searchResult.count || searchResult.messages.length;

      foundMsgs = [];
      angular.forEach(searchResult.messages, function (message) {
        var peerID = getMessagePeer(message);
        if (peerID < 0) {
          var chat = AppChatsManager.getChat(-peerID);
          if (chat.migrated_to) {
            migrateChecks(peerID, -chat.migrated_to.channel_id);
          }
        }
        foundMsgs.push(message.mid);
      });

      if (useSearchCache) {
        lastSearchResults = listMergeSorted(lastSearchResults, foundMsgs);
      }

      return {
        count: foundCount,
        history: foundMsgs
      };
    }, function (error) {
      if (error.code == 400) {
        error.handled = true;
      }
      return $q.reject(error);
    });
  }

  function getMessage (messageID) {
    return messagesStorage[messageID] || {deleted: true};
  }

  function deleteMessages (messageIDs) {
    var splitted = AppMessagesIDsManager.splitMessageIDsByChannels(messageIDs);
    var promises = [];
    angular.forEach(splitted.msgIDs, function (msgIDs, channelID) {
      var promise;
      if (channelID > 0) {
        var channel = AppChatsManager.getChat(channelID);
        if (!channel.pFlags.creator && !(channel.pFlags.editor && channel.pFlags.megagroup)) {
          var goodMsgIDs = [];
          if (channel.pFlags.editor || channel.pFlags.megagroup) {
            angular.forEach(msgIDs, function (msgID, i) {
              var message = getMessage(splitted.mids[channelID][i]);
              if (message.pFlags.out) {
                goodMsgIDs.push(msgID);
              }
            });
          }
          if (!goodMsgIDs.length) {
            return;
          }
          msgIDs = goodMsgIDs;
        }
        promise = MtpApiManager.invokeApi('channels.deleteMessages', {
          channel: AppChatsManager.getChannelInput(channelID),
          id: msgIDs
        }).then(function (affectedMessages) {
          ApiUpdatesManager.processUpdateMessage({
            _: 'updateShort',
            update: {
              _: 'updateDeleteChannelMessages',
              channel_id: channelID,
              messages: msgIDs,
              pts: affectedMessages.pts,
              pts_count: affectedMessages.pts_count
            }
          });
        });
      } else {
        promise = MtpApiManager.invokeApi('messages.deleteMessages', {
          id: msgIDs
        }).then(function (affectedMessages) {
          ApiUpdatesManager.processUpdateMessage({
            _: 'updateShort',
            update: {
              _: 'updateDeleteMessages',
              messages: msgIDs,
              pts: affectedMessages.pts,
              pts_count: affectedMessages.pts_count
            }
          });
        });
      }
      promises.push(promise);
    });

    return $q.all(promises);
  }

  function getMessageShareLink(fullMsgID) {
    var info = AppMessagesIDsManager.getMessageIDInfo(fullMsgID);
    var msgID = info[0];
    var channelID = info[1];
    if (!channelID) {
      return $q.reject();
    }
    var message = getMessage(fullMsgID);
    if (!message || !message.pFlags || !message.pFlags.post) {
      return $q.reject();
    }
    return MtpApiManager.invokeApi('channels.exportMessageLink', {
      channel: AppChatsManager.getChannelInput(channelID),
      id: msgID
    }).then(function (exportedMessageLink) {
      return exportedMessageLink.link;
    });
  }

  function readHistory (peerID) {
    // console.trace('start read');
    var isChannel = AppPeersManager.isChannel(peerID),
        historyStorage = historiesStorage[peerID],
        foundDialog = getDialogByPeerID(peerID)[0];

    if (!foundDialog || !foundDialog.unread_count) {

      if (!historyStorage || !historyStorage.history.length) {
        return false;
      }

      var messageID,
          message,
          foundUnread = false;
      for (i = historyStorage.history.length; i >= 0; i--) {
        messageID = historyStorage.history[i];
        message = messagesStorage[messageID];
        if (message && !message.pFlags.out && message.pFlags.unread) {
          foundUnread = true;
          break;
        }
      }
      if (!foundUnread) {
        return false;
      }
    }

    if (historyStorage.readPromise) {
      return historyStorage.readPromise;
    }

    var apiPromise;
    if (isChannel) {
      apiPromise = MtpApiManager.invokeApi('channels.readHistory', {
        channel: AppChatsManager.getChannelInput(-peerID),
        max_id: 0
      });
    } else {
      apiPromise = MtpApiManager.invokeApi('messages.readHistory', {
        peer: AppPeersManager.getInputPeerByID(peerID),
        max_id: 0
      }).then(function (affectedMessages) {
        ApiUpdatesManager.processUpdateMessage({
          _: 'updateShort',
          update: {
            _: 'updatePts',
            pts: affectedMessages.pts,
            pts_count: affectedMessages.pts_count
          }
        });
      })
    }

    historyStorage.readPromise = apiPromise.then(function () {
      if (foundDialog) {
        // console.log('done read history', peerID);
        foundDialog.unread_count = 0;
        $rootScope.$broadcast('dialog_unread', {peerID: peerID, count: 0});
        $rootScope.$broadcast('messages_read');
        if (historyStorage && historyStorage.history.length) {
          foundDialog.read_inbox_max_id = historyStorage.history[0];
        }
      }
    })['finally'](function () {
      delete historyStorage.readPromise;
    });

    if (historyStorage && historyStorage.history.length) {
      var messageID, message, i, peerID, foundDialog, dialog;
      for (i = 0; i < historyStorage.history.length; i++) {
        messageID = historyStorage.history[i];
        message = messagesStorage[messageID];
        if (message && !message.pFlags.out) {
          message.pFlags.unread = false;
          if (messagesForHistory[messageID]) {
            messagesForHistory[messageID].pFlags.unread = false;
          }
          if (messagesForDialogs[messageID]) {
            messagesForDialogs[messageID].pFlags.unread = false;
          }
          NotificationsManager.cancel('msg' + messageID);
        }
      }
    }

    NotificationsManager.soundReset(AppPeersManager.getPeerString(peerID))

    return historyStorage.readPromise;
  }

  function readMessages (messageIDs) {
    MtpApiManager.invokeApi('messages.readMessageContents', {
      id: messageIDs
    }).then(function (affectedMessages) {
      ApiUpdatesManager.processUpdateMessage({
        _: 'updateShort',
        update: {
          _: 'updateReadMessagesContents',
          messages: messageIDs,
          pts: affectedMessages.pts,
          pts_count: affectedMessages.pts_count
        }
      });
    });
  }

  function doFlushHistory (inputPeer, justClear) {
    var flags = 0;
    if (justClear) {
      flags |= 1;
    }
    return MtpApiManager.invokeApi('messages.deleteHistory', {
      flags: flags,
      peer: inputPeer,
      max_id: 0
    }).then(function (affectedHistory) {
      ApiUpdatesManager.processUpdateMessage({
        _: 'updateShort',
        update: {
          _: 'updatePts',
          pts: affectedHistory.pts,
          pts_count: affectedHistory.pts_count
        }
      });
      if (!affectedHistory.offset) {
        return true;
      }
      return doFlushHistory(inputPeer, justClear);
    });
  }

  function flushHistory (peerID, justClear) {
    return doFlushHistory(AppPeersManager.getInputPeerByID(peerID), justClear).then(function () {
      if (justClear) {
        $rootScope.$broadcast('dialog_flush', {peerID: peerID});
      } else {
        var foundDialog = getDialogByPeerID(peerID);
        if (foundDialog[0]) {
          dialogsStorage.dialogs.splice(foundDialog[1], 1);
        }
        delete historiesStorage[peerID];
        $rootScope.$broadcast('dialog_drop', {peerID: peerID});
      }
    });
  }

  function saveMessages (apiMessages, options) {
    options = options || {};
    angular.forEach(apiMessages, function (apiMessage) {
      if (apiMessage.pFlags === undefined) {
        apiMessage.pFlags = {};
      }
      if (!apiMessage.pFlags.out) {
        apiMessage.pFlags.out = false;
      }
      if (!apiMessage.pFlags.unread) {
        apiMessage.pFlags.unread = false;
      }
      if (apiMessage._ == 'messageEmpty') {
        return;
      }

      var toPeerID = AppPeersManager.getPeerID(apiMessage.to_id);
      var isChannel = apiMessage.to_id._ == 'peerChannel';
      var channelID = isChannel ? -toPeerID : 0;
      var isBroadcast = isChannel && !AppChatsManager.isMegagroup(channelID);

      var mid = AppMessagesIDsManager.getFullMessageID(apiMessage.id, channelID);
      apiMessage.mid = mid;

      var dialog = getDialogByPeerID(toPeerID)[0];
      if (dialog && mid > 0) {
        var dialogKey = apiMessage.pFlags.out
          ? 'read_outbox_max_id'
          : 'read_inbox_max_id';

        apiMessage.pFlags.unread = mid > dialog[dialogKey];
      }
      else if (options.isNew) {
        apiMessage.pFlags.unread = true;
      }

      if (apiMessage.reply_to_msg_id) {
        apiMessage.reply_to_mid = AppMessagesIDsManager.getFullMessageID(apiMessage.reply_to_msg_id, channelID);
      }

      apiMessage.date -= ServerTimeManager.serverTimeOffset;

      var fwdHeader = apiMessage.fwd_from;
      if (fwdHeader) {
        apiMessage.fwdFromID = fwdHeader.channel_id ? -fwdHeader.channel_id : fwdHeader.from_id;
        fwdHeader.date -= ServerTimeManager.serverTimeOffset;
      }

      apiMessage.toID = toPeerID;
      apiMessage.fromID = apiMessage.pFlags.post ? toPeerID : apiMessage.from_id;
      apiMessage.signID = apiMessage.pFlags.post && apiMessage.from_id ||
                          fwdHeader && fwdHeader.channel_id && fwdHeader.from_id;

      if (apiMessage.via_bot_id > 0) {
        apiMessage.viaBotID = apiMessage.via_bot_id;
      }

      var mediaContext = {
        user_id: apiMessage.fromID,
        date: apiMessage.date
      };

      if (apiMessage.media) {
        switch (apiMessage.media._) {
          case 'messageMediaEmpty':
            delete apiMessage.media;
            break;
          case 'messageMediaPhoto':
            AppPhotosManager.savePhoto(apiMessage.media.photo, mediaContext);
            break;
          case 'messageMediaDocument':
            AppDocsManager.saveDoc(apiMessage.media.document, mediaContext);
            break;
          case 'messageMediaWebPage':
            AppWebPagesManager.saveWebPage(apiMessage.media.webpage, apiMessage.mid, mediaContext);
            break;
        }
      }
      if (apiMessage.action) {
        var migrateFrom, migrateTo;
        switch (apiMessage.action._) {
          case 'messageActionChatEditPhoto':
            AppPhotosManager.savePhoto(apiMessage.action.photo, mediaContext);
            if (isBroadcast) {
              apiMessage.action._ = 'messageActionChannelEditPhoto';
            }
            break;

          case 'messageActionChatEditTitle':
            if (isBroadcast) {
              apiMessage.action._ = 'messageActionChannelEditTitle';
            }
            break;

          case 'messageActionChatDeletePhoto':
            if (isBroadcast) {
              apiMessage.action._ = 'messageActionChannelDeletePhoto';
            }
            break;

          case 'messageActionChatAddUser':
            if (apiMessage.action.users.length == 1) {
              apiMessage.action.user_id = apiMessage.action.users[0];
              if (apiMessage.fromID == apiMessage.action.user_id) {
                if (isChannel) {
                  apiMessage.action._ = 'messageActionChatJoined';
                } else {
                  apiMessage.action._ = 'messageActionChatReturn';
                }
              }
            }
            else if (apiMessage.action.users.length > 1) {
              apiMessage.action._ = 'messageActionChatAddUsers';
            }
            break;

          case 'messageActionChatDeleteUser':
            if (apiMessage.fromID == apiMessage.action.user_id) {
              apiMessage.action._ = 'messageActionChatLeave';
            }
            break;

          case 'messageActionChannelMigrateFrom':
            migrateFrom = -apiMessage.action.chat_id;
            migrateTo = -channelID;
            break;

          case 'messageActionChatMigrateTo':
            migrateFrom = -channelID;
            migrateTo = -apiMessage.action.channel_id;
            break;

          case 'messageActionHistoryClear':
            apiMessage.deleted = true;
            apiMessage.clear_history = true;
            apiMessage.pFlags.out = false;
            apiMessage.pFlags.unread = false;
            break;
        }
        if (migrateFrom &&
            migrateTo &&
            !migratedFromTo[migrateFrom] &&
            !migratedToFrom[migrateTo]) {
          migrateChecks(migrateFrom, migrateTo);
        }
      }

      if (apiMessage.message && apiMessage.message.length) {
        var myEntities = RichTextProcessor.parseEntities(apiMessage.message);
        var apiEntities = apiMessage.entities || [];
        apiMessage.totalEntities = RichTextProcessor.mergeEntities(myEntities, apiEntities, !apiMessage.pending);
      }

      if (!options.isEdited) {
        messagesStorage[mid] = apiMessage;
      }
    });
  }

  function sendText(peerID, text, options) {
    if (!angular.isString(text)) {
      return;
    }
    options = options || {};
    var entities = options.entities || [];
    if (!options.viaBotID) {
      text = RichTextProcessor.parseMarkdown(text, entities);
    }
    if (!text.length) {
      return;
    }

    var messageID = tempID--,
        randomID = [nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)],
        randomIDS = bigint(randomID[0]).shiftLeft(32).add(bigint(randomID[1])).toString(),
        historyStorage = historiesStorage[peerID],
        flags = 0,
        pFlags = {},
        replyToMsgID = options.replyToMsgID,
        isChannel = AppPeersManager.isChannel(peerID),
        isMegagroup = isChannel && AppPeersManager.isMegagroup(peerID),
        asChannel = isChannel && !isMegagroup ? true : false,
        message;

    if (historyStorage === undefined) {
      historyStorage = historiesStorage[peerID] = {count: null, history: [], pending: []};
    }

    var fromID = AppUsersManager.getSelf().id;
    if (peerID != fromID) {
      flags |= 2;
      pFlags.out = true;
      if (!isChannel && !AppUsersManager.isBot(peerID)) {
        flags |= 1;
        pFlags.unread = true;
      }
    }
    if (replyToMsgID) {
      flags |= 8;
    }
    if (asChannel) {
      fromID = 0;
    } else {
      flags |= 256;
    }
    message = {
      _: 'message',
      id: messageID,
      from_id: fromID,
      to_id: AppPeersManager.getOutputPeer(peerID),
      flags: flags,
      pFlags: pFlags,
      date: tsNow(true) + ServerTimeManager.serverTimeOffset,
      message: text,
      random_id: randomIDS,
      reply_to_msg_id: replyToMsgID,
      via_bot_id: options.viaBotID,
      reply_markup: options.reply_markup,
      entities: entities,
      views: asChannel && 1,
      pending: true
    };

    var toggleError = function (on) {
      var historyMessage = messagesForHistory[messageID];
      if (on) {
        message.error = true;
        if (historyMessage) {
          historyMessage.error = true;
        }
      } else {
        delete message.error;
        if (historyMessage) {
          delete historyMessage.error;
        }
      }
      $rootScope.$broadcast('messages_pending');
    }

    message.send = function () {
      toggleError(false);
      var sentRequestOptions = {};
      if (pendingAfterMsgs[peerID]) {
        sentRequestOptions.afterMessageID = pendingAfterMsgs[peerID].messageID;
      }
      var flags = 0;
      if (replyToMsgID) {
        flags |= 1;
      }
      if (asChannel) {
        flags |= 16;
      }
      if (options.clearDraft) {
        flags |= 128;
      }
      var apiPromise;
      if (options.viaBotID) {
        apiPromise = MtpApiManager.invokeApi('messages.sendInlineBotResult', {
          flags: flags,
          peer: AppPeersManager.getInputPeerByID(peerID),
          random_id: randomID,
          reply_to_msg_id: AppMessagesIDsManager.getMessageLocalID(replyToMsgID),
          query_id: options.queryID,
          id: options.resultID
        }, sentRequestOptions);
      } else {
        if (entities.length) {
          flags |= 8;
        }
        apiPromise = MtpApiManager.invokeApi('messages.sendMessage', {
          flags: flags,
          peer: AppPeersManager.getInputPeerByID(peerID),
          message: text,
          random_id: randomID,
          reply_to_msg_id: AppMessagesIDsManager.getMessageLocalID(replyToMsgID),
          entities: entities
        }, sentRequestOptions)
      }
      // console.log(flags, entities);
      apiPromise.then(function (updates) {
        if (updates._ == 'updateShortSentMessage') {
          message.flags = updates.flags;
          message.date = updates.date;
          message.id = updates.id;
          message.media = updates.media;
          message.entities = updates.entities;
          updates = {
            _: 'updates',
            users: [],
            chats: [],
            seq: 0,
            updates: [{
              _: 'updateMessageID',
              random_id: randomIDS,
              id: updates.id
            }, {
              _: isChannel ? 'updateNewChannelMessage' : 'updateNewMessage',
              message: message,
              pts: updates.pts,
              pts_count: updates.pts_count
            }]
          };
        }
        ApiUpdatesManager.processUpdateMessage(updates);
      }, function (error) {
        toggleError(true);
      })['finally'](function () {
        if (pendingAfterMsgs[peerID] === sentRequestOptions) {
          delete pendingAfterMsgs[peerID];
        }
      });

      pendingAfterMsgs[peerID] = sentRequestOptions;
    };

    saveMessages([message]);
    historyStorage.pending.unshift(messageID);
    $rootScope.$broadcast('history_append', {peerID: peerID, messageID: messageID, my: true});

    setZeroTimeout(message.send);
    // setTimeout(function () {
    //   message.send();
    // }, 5000);

    ApiUpdatesManager.processUpdateMessage({
      _: 'updateShort',
      update: {
        _: 'updateDraftMessage',
        peer: AppPeersManager.getOutputPeer(peerID),
        draft: {_: 'draftMessageEmpty'}
      }
    });

    pendingByRandomID[randomIDS] = [peerID, messageID];
  };

  function sendFile(peerID, file, options) {
    options = options || {};
    var messageID = tempID--,
        randomID = [nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)],
        randomIDS = bigint(randomID[0]).shiftLeft(32).add(bigint(randomID[1])).toString(),
        historyStorage = historiesStorage[peerID],
        flags = 0,
        pFlags = {},
        replyToMsgID = options.replyToMsgID,
        isChannel = AppPeersManager.isChannel(peerID),
        isMegagroup = isChannel && AppPeersManager.isMegagroup(peerID),
        asChannel = isChannel && !isMegagroup ? true : false,
        attachType, apiFileName, realFileName;

    if (!options.isMedia) {
      attachType = 'document';
      apiFileName = 'document.' + file.type.split('/')[1];
    } else if (['image/jpeg', 'image/png', 'image/bmp'].indexOf(file.type) >= 0) {
      attachType = 'photo';
      apiFileName = 'photo.' + file.type.split('/')[1];
    } else if (file.type.substr(0, 6) == 'audio/' || ['video/ogg'].indexOf(file.type) >= 0) {
      attachType = 'audio';
      apiFileName = 'audio.' + (file.type.split('/')[1] == 'ogg' ? 'ogg' : 'mp3');
    } else if (file.type.substr(0, 6) == 'video/') {
      attachType = 'video';
      apiFileName = 'video.mp4';
    } else {
      attachType = 'document';
      apiFileName = 'document.' + file.type.split('/')[1];
    }

    console.log(attachType, apiFileName, file.type);

    if (historyStorage === undefined) {
      historyStorage = historiesStorage[peerID] = {count: null, history: [], pending: []};
    }

    var fromID = AppUsersManager.getSelf().id;
    if (peerID != fromID) {
      flags |= 2;
      pFlags.out = true;
      if (!isChannel && !AppUsersManager.isBot(peerID)) {
        flags |= 1;
        pFlags.unread = true;
      }
    }
    if (replyToMsgID) {
      flags |= 8;
    }
    if (asChannel) {
      fromID = 0;
    } else {
      flags |= 256;
    }
    var media = {
      _: 'messageMediaPending',
      type: attachType,
      file_name: file.name || apiFileName,
      size: file.size,
      progress: {percent: 1, total: file.size}
    };

    var message = {
      _: 'message',
      id: messageID,
      from_id: fromID,
      to_id: AppPeersManager.getOutputPeer(peerID),
      flags: flags,
      pFlags: pFlags,
      date: tsNow(true) + ServerTimeManager.serverTimeOffset,
      message: '',
      media: media,
      random_id: randomIDS,
      reply_to_msg_id: replyToMsgID,
      views: asChannel && 1,
      pending: true
    };

    var toggleError = function (on) {
      var historyMessage = messagesForHistory[messageID];
      if (on) {
        message.error = true;
        if (historyMessage) {
          historyMessage.error = true;
        }
      } else {
        delete message.error;
        if (historyMessage) {
          delete historyMessage.error;
        }
      }
      $rootScope.$broadcast('messages_pending');
    }

    var uploaded = false,
        uploadPromise;

    message.send = function () {
      var sendFileDeferred = $q.defer();

      sendFilePromise.then(function () {
        if (!uploaded || message.error) {
          uploaded = false;
          uploadPromise = MtpApiFileManager.uploadFile(file);
        }

        uploadPromise.then(function (inputFile) {
          inputFile.name = apiFileName;
          uploaded = true;
          var inputMedia;
          switch (attachType) {
            case 'photo':
              inputMedia = {_: 'inputMediaUploadedPhoto', file: inputFile};
              break;

            case 'document':
            default:
              inputMedia = {_: 'inputMediaUploadedDocument', file: inputFile, mime_type: file.type, caption: '', attributes: [
                {_: 'documentAttributeFilename', file_name: file.name}
              ]};
          }
          var flags = 0;
          if (replyToMsgID) {
            flags |= 1;
          }
          if (asChannel) {
            flags |= 16;
          }
          MtpApiManager.invokeApi('messages.sendMedia', {
            flags: flags,
            peer: AppPeersManager.getInputPeerByID(peerID),
            media: inputMedia,
            random_id: randomID,
            reply_to_msg_id: AppMessagesIDsManager.getMessageLocalID(replyToMsgID)
          }).then(function (updates) {
            ApiUpdatesManager.processUpdateMessage(updates);
          }, function (error) {
            if (attachType == 'photo' &&
                error.code == 400 &&
                (error.type == 'PHOTO_INVALID_DIMENSIONS' ||
                 error.type == 'PHOTO_SAVE_FILE_INVALID')) {
              error.handled = true;
              attachType = 'document';
              message.send();
              return;
            }
            toggleError(true);
          });
        }, function (error) {
          toggleError(true);
        }, function (progress) {
          // console.log('upload progress', progress);
          media.progress.done = progress.done;
          media.progress.percent = Math.max(1, Math.floor(100 * progress.done / progress.total));
          $rootScope.$broadcast('history_update', {peerID: peerID});
        });

        media.progress.cancel = function () {
          if (!uploaded) {
            sendFileDeferred.resolve();
            uploadPromise.cancel();
            cancelPendingMessage(randomIDS);
          }
        }

        uploadPromise['finally'](function () {
          sendFileDeferred.resolve();
        });
      });

      sendFilePromise = sendFileDeferred.promise;
    };

    saveMessages([message]);
    historyStorage.pending.unshift(messageID);
    $rootScope.$broadcast('history_append', {peerID: peerID, messageID: messageID, my: true});

    setZeroTimeout(message.send);

    pendingByRandomID[randomIDS] = [peerID, messageID];
  }

  function sendOther(peerID, inputMedia, options) {
    options = options || {};

    var messageID = tempID--,
        randomID = [nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)],
        randomIDS = bigint(randomID[0]).shiftLeft(32).add(bigint(randomID[1])).toString(),
        historyStorage = historiesStorage[peerID],
        replyToMsgID = options.replyToMsgID,
        isChannel = AppPeersManager.isChannel(peerID),
        isMegagroup = isChannel && AppPeersManager.isMegagroup(peerID),
        asChannel = isChannel && !isMegagroup ? true : false;

    if (historyStorage === undefined) {
      historyStorage = historiesStorage[peerID] = {count: null, history: [], pending: []};
    }

    var fromID = AppUsersManager.getSelf().id;
    var media;
    switch (inputMedia._) {
      case 'inputMediaPhoto':
        media = {
          _: 'messageMediaPhoto',
          photo: AppPhotosManager.getPhoto(inputMedia.id.id),
          caption: inputMedia.caption || ''
        };
        break;

      case 'inputMediaDocument':
        var doc = AppDocsManager.getDoc(inputMedia.id.id);
        if (doc.sticker && doc.stickerSetInput) {
          AppStickersManager.pushPopularSticker(doc.id);
        };
        media = {
          _: 'messageMediaDocument',
          'document': doc,
          caption: inputMedia.caption || ''
        };
        break;

      case 'inputMediaContact':
        media = {
          _: 'messageMediaContact',
          phone_number: inputMedia.phone_number,
          first_name: inputMedia.first_name,
          last_name: inputMedia.last_name,
          user_id: 0
        };
        break;

      case 'inputMediaGeoPoint':
        media = {
          _: 'messageMediaGeo',
          geo: {
            _: 'geoPoint',
            'lat': inputMedia.geo_point['lat'],
            'long': inputMedia.geo_point['long']
          }
        };
        break;

      case 'inputMediaVenue':
        media = {
          _: 'messageMediaVenue',
          geo: {
            _: 'geoPoint',
            'lat': inputMedia.geo_point['lat'],
            'long': inputMedia.geo_point['long']
          },
          title: inputMedia.title,
          address: inputMedia.address,
          provider: inputMedia.provider,
          venue_id: inputMedia.venue_id
        };
        break;

      case 'messageMediaPending':
        media = inputMedia;
        break;
    }

    var flags = 0;
    var pFlags = {};
    if (peerID != fromID) {
      flags |= 2;
      pFlags.out = true;
      if (!AppUsersManager.isBot(peerID)) {
        flags |= 1;
        pFlags.unread = true;
      }
    }
    if (replyToMsgID) {
      flags |= 8;
    }
    if (asChannel) {
      fromID = 0;
    } else {
      flags |= 256;
    }

    var message = {
      _: 'message',
      id: messageID,
      from_id: fromID,
      to_id: AppPeersManager.getOutputPeer(peerID),
      flags: flags,
      pFlags: pFlags,
      date: tsNow(true) + ServerTimeManager.serverTimeOffset,
      message: '',
      media: media,
      random_id: randomIDS,
      reply_to_msg_id: replyToMsgID,
      via_bot_id: options.viaBotID,
      reply_markup: options.reply_markup,
      views: asChannel && 1,
      pending: true
    };

    var toggleError = function (on) {
      var historyMessage = messagesForHistory[messageID];
      if (on) {
        message.error = true;
        if (historyMessage) {
          historyMessage.error = true;
        }
      } else {
        delete message.error;
        if (historyMessage) {
          delete historyMessage.error;
        }
      }
      $rootScope.$broadcast('messages_pending');
    }

    message.send = function () {
      var flags = 0;
      if (replyToMsgID) {
        flags |= 1;
      }
      if (asChannel) {
        flags |= 16;
      }

      var sentRequestOptions = {};
      if (pendingAfterMsgs[peerID]) {
        sentRequestOptions.afterMessageID = pendingAfterMsgs[peerID].messageID;
      }

      var apiPromise;
      if (options.viaBotID) {
        apiPromise = MtpApiManager.invokeApi('messages.sendInlineBotResult', {
          flags: flags,
          peer: AppPeersManager.getInputPeerByID(peerID),
          random_id: randomID,
          reply_to_msg_id: AppMessagesIDsManager.getMessageLocalID(replyToMsgID),
          query_id: options.queryID,
          id: options.resultID
        }, sentRequestOptions);
      } else {
        apiPromise = MtpApiManager.invokeApi('messages.sendMedia', {
          flags: flags,
          peer: AppPeersManager.getInputPeerByID(peerID),
          media: inputMedia,
          random_id: randomID,
          reply_to_msg_id: AppMessagesIDsManager.getMessageLocalID(replyToMsgID)
        }, sentRequestOptions);
      }
      apiPromise.then(function (updates) {
        ApiUpdatesManager.processUpdateMessage(updates);
      }, function (error) {
        toggleError(true);
      })['finally'](function () {
        if (pendingAfterMsgs[peerID] === sentRequestOptions) {
          delete pendingAfterMsgs[peerID];
        }
      });
      pendingAfterMsgs[peerID] = sentRequestOptions;
    };

    saveMessages([message]);
    historyStorage.pending.unshift(messageID);
    $rootScope.$broadcast('history_append', {peerID: peerID, messageID: messageID, my: true});

    setZeroTimeout(message.send);

    pendingByRandomID[randomIDS] = [peerID, messageID];
  }

  function forwardMessages (peerID, mids) {
    mids = mids.sort();

    var flags = 0;
    var isChannel = AppPeersManager.isChannel(peerID);
    var isMegagroup = isChannel && AppPeersManager.isMegagroup(peerID);
    var asChannel = isChannel && !isMegagroup ? true : false;

    if (asChannel) {
      flags |= 16;
    }

    var splitted = AppMessagesIDsManager.splitMessageIDsByChannels(mids);
    var promises = [];
    angular.forEach(splitted.msgIDs, function (msgIDs, channelID) {
      var len = msgIDs.length;
      var randomIDs = [];
      for (var i = 0; i < len; i++) {
        randomIDs.push([nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)]);
      }
      var sentRequestOptions = {};
      if (pendingAfterMsgs[peerID]) {
        sentRequestOptions.afterMessageID = pendingAfterMsgs[peerID].messageID;
      }
      var promise = MtpApiManager.invokeApi('messages.forwardMessages', {
        flags: flags,
        from_peer: AppPeersManager.getInputPeerByID(-channelID),
        id: msgIDs,
        random_id: randomIDs,
        to_peer: AppPeersManager.getInputPeerByID(peerID),
      }, sentRequestOptions).then(function (updates) {
        ApiUpdatesManager.processUpdateMessage(updates);
      })['finally'](function () {
        if (pendingAfterMsgs[peerID] === sentRequestOptions) {
          delete pendingAfterMsgs[peerID];
        }
      });
      pendingAfterMsgs[peerID] = sentRequestOptions;
      promises.push(promise);
    });

    return $q.all(promises);
  };

  function startBot (botID, chatID, startParam) {
    var peerID = chatID ? -chatID : botID;
    if (startParam) {
      var randomID = bigint(nextRandomInt(0xFFFFFFFF)).shiftLeft(32).add(bigint(nextRandomInt(0xFFFFFFFF))).toString();

      return MtpApiManager.invokeApi('messages.startBot', {
        bot: AppUsersManager.getUserInput(botID),
        peer: AppPeersManager.getInputPeerByID(peerID),
        random_id: randomID,
        start_param: startParam
      }).then(function (updates) {
        ApiUpdatesManager.processUpdateMessage(updates);
      });
    }

    if (chatID) {
      if (AppChatsManager.isChannel(chatID)) {
        return MtpApiManager.invokeApi('channels.inviteToChannel', {
          channel: AppChatsManager.getChannelInput(chatID),
          users: [AppUsersManager.getUserInput(botID)]
        }).then(function (updates) {
          ApiUpdatesManager.processUpdateMessage(updates);
          sendText(peerID, '/start@' + bot.username);
        }, function (error) {
          if (error && error.type == 'USER_ALREADY_PARTICIPANT') {
            var bot = AppUsersManager.getUser(botID);
            sendText(peerID, '/start@' + bot.username);
            error.handled = true;
          }
        });
      } else {
        return MtpApiManager.invokeApi('messages.addChatUser', {
          chat_id: AppChatsManager.getChatInput(chatID),
          user_id: AppUsersManager.getUserInput(botID)
        }).then(function (updates) {
          ApiUpdatesManager.processUpdateMessage(updates);
          sendText(peerID, '/start@' + bot.username);
        }, function (error) {
          if (error && error.type == 'USER_ALREADY_PARTICIPANT') {
            var bot = AppUsersManager.getUser(botID);
            sendText(peerID, '/start@' + bot.username);
            error.handled = true;
          }
        });
      }
    }

    return sendText(peerID, '/start');
  }

  function cancelPendingMessage (randomID) {
    var pendingData = pendingByRandomID[randomID];

    console.log('pending', randomID, pendingData);

    if (pendingData) {
      var peerID = pendingData[0],
          tempID = pendingData[1],
          historyStorage = historiesStorage[peerID],
          pos = historyStorage.pending.indexOf(tempID);

      ApiUpdatesManager.processUpdateMessage({
        _: 'updateShort',
        update: {
          _: 'updateDeleteMessages',
          messages: [tempID]
        }
      });

      if (pos != -1) {
        historyStorage.pending.splice(pos, 1);
      }

      delete messagesForHistory[tempID];
      delete messagesStorage[tempID];

      return true;
    }

    return false;
  }

  function finalizePendingMessage(randomID, finalMessage) {
    var pendingData = pendingByRandomID[randomID];
    // console.log('pdata', randomID, pendingData);

    if (pendingData) {
      var peerID = pendingData[0],
          tempID = pendingData[1],
          historyStorage = historiesStorage[peerID],
          message,
          historyMessage;

      // console.log('pending', randomID, historyStorage.pending);
      var pos = historyStorage.pending.indexOf(tempID);
      if (pos != -1) {
        historyStorage.pending.splice(pos, 1);
      }

      if (message = messagesStorage[tempID]) {
        delete message.pending;
        delete message.error;
        delete message.random_id;
        delete message.send;
      }

      if (historyMessage = messagesForHistory[tempID]) {
        messagesForHistory[finalMessage.mid] = angular.extend(historyMessage, wrapForHistory(finalMessage.mid));
        delete historyMessage.pending;
        delete historyMessage.error;
        delete historyMessage.random_id;
        delete historyMessage.send;

        $rootScope.$broadcast('messages_pending');
      }

      delete messagesForHistory[tempID];
      delete messagesStorage[tempID];

      return message;
    }

    return false;
  }

  function getMessagePeer (message) {
    var toID = message.to_id && AppPeersManager.getPeerID(message.to_id) || 0;

    if (toID < 0) {
      return toID;
    } else if (message.pFlags && message.pFlags.out || message.flags & 2) {
      return toID;
    }
    return message.from_id;
  }

  function wrapForDialog (msgID, dialog) {
    var useCache = msgID && dialog !== undefined;
    var unreadCount = dialog && dialog.unread_count;

    if (useCache && messagesForDialogs[msgID] !== undefined) {
      delete messagesForDialogs[msgID].typing;
      messagesForDialogs[msgID].unreadCount = unreadCount;
      return messagesForDialogs[msgID];
    }

    var message = angular.copy(messagesStorage[msgID]);

    if (!message || !message.to_id) {
      if (dialog && dialog.peerID) {
        message = {_: 'message', to_id: AppPeersManager.getOutputPeer(dialog.peerID), deleted: true, date: tsNow(true), pFlags: {}};
        message.deleted = true;
      } else {
        return message;
      }
    }

    message.peerID = getMessagePeer(message);
    message.peerData = AppPeersManager.getPeer(message.peerID);
    message.peerString = AppPeersManager.getPeerString(message.peerID);
    message.unreadCount = unreadCount;

    if (message._ == 'messageService' && message.action.user_id) {
      message.action.user = AppUsersManager.getUser(message.action.user_id);
    }

    if (message.message && message.message.length) {
      message.richMessage = RichTextProcessor.wrapRichText(message.message.substr(0, 64), {noLinks: true, noLinebreaks: true});
    }

    message.dateText = dateOrTimeFilter(message.date);

    if (useCache) {
      message.draft = DraftsManager.getServerDraft(message.peerID);
      messagesForDialogs[msgID] = message;
    }

    return message;
  }

  function wrapSingleMessage(msgID) {
    if (messagesStorage[msgID]) {
      return wrapForDialog(msgID);
    }
    if (needSingleMessages.indexOf(msgID) == -1) {
      needSingleMessages.push(msgID);
      if (fetchSingleMessagesTimeout === false) {
        fetchSingleMessagesTimeout = setTimeout(fetchSingleMessages, 100);
      }
    }
    return {mid: msgID, loading: true};
  }

  function clearDialogCache (msgID) {
    delete messagesForDialogs[msgID];
  }

  function wrapForHistory (msgID) {
    if (messagesForHistory[msgID] !== undefined) {
      return messagesForHistory[msgID];
    }

    var message = angular.copy(messagesStorage[msgID]) || {id: msgID};

    if (message.media && message.media.progress !== undefined) {
      message.media.progress = messagesStorage[msgID].media.progress;
    }

    var fromUser = message.from_id && AppUsersManager.getUser(message.from_id);
    var fromBot = fromUser && fromUser.pFlags.bot && fromUser.username || false;
    var withBot = (fromBot ||
                    message.to_id && (
                      message.to_id.chat_id ||
                      message.to_id.user_id && AppUsersManager.isBot(message.to_id.user_id)
                    )
                  );

    if (message.media) {
      if (message.media.caption &&
          message.media.caption.length) {
        message.media.rCaption = RichTextProcessor.wrapRichText(message.media.caption, {
          noCommands: !withBot,
          fromBot: fromBot
        });
      }

      switch (message.media._) {
        case 'messageMediaPhoto':
          message.media.photo = AppPhotosManager.wrapForHistory(message.media.photo.id);
          break;

        case 'messageMediaDocument':
          message.media.document = AppDocsManager.wrapForHistory(message.media.document.id);
          break;

        case 'messageMediaGeo':
          var mapUrl = 'https://maps.google.com/?q=' + message.media.geo['lat'] + ',' + message.media.geo['long'];
          message.media.mapUrl = $sce.trustAsResourceUrl(mapUrl);
          break;

        case 'messageMediaVenue':
          var mapUrl;
          if (message.media.provider == 'foursquare' &&
              message.media.venue_id) {
            mapUrl = 'https://foursquare.com/v/' + encodeURIComponent(message.media.venue_id);
          } else {
            mapUrl = 'https://maps.google.com/?q=' + message.media.geo['lat'] + ',' + message.media.geo['long'];
          }
          message.media.mapUrl = $sce.trustAsResourceUrl(mapUrl);
          break;

        case 'messageMediaContact':
          message.media.rFullName = RichTextProcessor.wrapRichText(
            message.media.first_name + ' ' + (message.media.last_name || ''),
            {noLinks: true, noLinebreaks: true}
          );
          break;

        case 'messageMediaWebPage':
          if (!message.media.webpage ||
              message.media.webpage._ == 'webPageEmpty') {
            delete message.media;
            break;
          }
          message.media.webpage = AppWebPagesManager.wrapForHistory(message.media.webpage.id);
          break;
      }
    }
    else if (message.action) {
      switch (message.action._) {
        case 'messageActionChatEditPhoto':
        case 'messageActionChannelEditPhoto':
          message.action.photo = AppPhotosManager.wrapForHistory(message.action.photo.id);
          break;

        case 'messageActionChatCreate':
        case 'messageActionChatEditTitle':
        case 'messageActionChannelCreate':
        case 'messageActionChannelEditTitle':
          message.action.rTitle = RichTextProcessor.wrapRichText(message.action.title, {noLinebreaks: true}) || _('chat_title_deleted');
          break;

        case 'messageActionBotIntro':
          message.action.rDescription = RichTextProcessor.wrapRichText(message.action.description, {
            noCommands: !withBot,
            fromBot: fromBot
          });
          break;
      }
    }

    var replyToMsgID = message.reply_to_mid;
    if (replyToMsgID) {
      message.reply_to_msg = wrapSingleMessage(replyToMsgID);
    }

    return messagesForHistory[msgID] = message;
  }

  function wrapReplyMarkup (replyMarkup) {
    if (!replyMarkup ||
        replyMarkup._ == 'replyKeyboardHide') {
      return false;
    }
    if (replyMarkup.wrapped) {
      return replyMarkup;
    }
    var isInline = replyMarkup._ == 'replyInlineMarkup';
    var count = replyMarkup.rows && replyMarkup.rows.length || 0;
    if (!isInline &&
        count > 0 &&
        count <= 4 &&
        !(replyMarkup.pFlags && replyMarkup.pFlags.resize)) {
      replyMarkup.splitCount = count;
    }
    replyMarkup.wrapped = true;
    angular.forEach(replyMarkup.rows, function (markupRow) {
      angular.forEach(markupRow.buttons, function (markupButton) {
        markupButton.rText = RichTextProcessor.wrapRichText(markupButton.text, {noLinks: true, noLinebreaks: true});
        if (markupButton._ == 'keyboardButtonUrl') {
          markupButton.pUrl = RichTextProcessor.wrapUrl(markupButton.url, 1);
        }
      })
    });
    return replyMarkup;
  }

  function fetchSingleMessages () {
    if (fetchSingleMessagesTimeout !== false) {
      clearTimeout(fetchSingleMessagesTimeout);
      fetchSingleMessagesTimeout = false;
    }
    if (!needSingleMessages.length) {
      return;
    }
    var mids = needSingleMessages.slice();
    needSingleMessages = [];

    var splitted = AppMessagesIDsManager.splitMessageIDsByChannels(mids);
    angular.forEach(splitted.msgIDs, function (msgIDs, channelID) {
      var promise;
      if (channelID > 0) {
        promise = MtpApiManager.invokeApi('channels.getMessages', {
          channel: AppChatsManager.getChannelInput(channelID),
          id: msgIDs
        });
      } else {
        promise = MtpApiManager.invokeApi('messages.getMessages', {
          id: msgIDs
        });
      }

      promise.then(function (getMessagesResult) {
        AppUsersManager.saveApiUsers(getMessagesResult.users);
        AppChatsManager.saveApiChats(getMessagesResult.chats);
        saveMessages(getMessagesResult.messages);

        $rootScope.$broadcast('messages_downloaded', splitted.mids[channelID]);
      })
    })
  }

  function incrementMessageViews () {
    if (incrementMessageViewsTimeout !== false) {
      clearTimeout(incrementMessageViewsTimeout);
      incrementMessageViewsTimeout = false;
    }
    if (!needIncrementMessageViews.length) {
      return;
    }
    var mids = needIncrementMessageViews.slice();
    needIncrementMessageViews = [];

    var splitted = AppMessagesIDsManager.splitMessageIDsByChannels(mids);
    angular.forEach(splitted.msgIDs, function (msgIDs, channelID) {
      // console.log('increment', msgIDs, channelID);
      MtpApiManager.invokeApi('messages.getMessagesViews', {
        peer: AppPeersManager.getInputPeerByID(-channelID),
        id: msgIDs,
        increment: true
      }).then(function (views) {
        if (channelID) {
          var mids = splitted.mids[channelID];
          var updates = [];
          for (var i = 0; i < mids.length; i++) {
            updates.push({
              _: 'updateChannelMessageViews',
              channel_id: channelID,
              id: mids[i],
              views: views[i]
            });
          }
          ApiUpdatesManager.processUpdateMessage({
            _: 'updates',
            updates: updates,
            chats: [],
            users: []
          });
        }
      })
    })
  }

  function regroupWrappedHistory (history, limit) {
    if (!history || !history.length) {
      return false;
    }
    var start = 0,
        len = history.length,
        end = len,
        i, curDay, prevDay, curMessage, prevMessage, curGrouped, prevGrouped,
        wasUpdated = false,
        groupFwd = !Config.Mobile;

    if (limit > 0) {
      end = Math.min(limit, len);
    } else if (limit < 0) {
      start = Math.max(0, end + limit);
    }

    for (i = start; i < end; i++) {
      if (history[i].deleted) {
        history.splice(i, 1);
        end--;
        continue;
      }
      curMessage = history[i];
      curDay = Math.floor((curMessage.date + ServerTimeManager.midnightOffset) / 86400);

      prevGrouped = prevMessage && prevMessage.grouped;
      curGrouped = curMessage.grouped;

      if (curDay === prevDay) {
        if (curMessage.needDate) {
          delete curMessage.needDate;
          wasUpdated = true;
        }
      } else if (!i || prevMessage) {
        if (!curMessage.needDate) {
          curMessage.needDate = true;
          wasUpdated = true;
        }
      }

      if (curMessage.fwdFromID &&
          curMessage.media &&
          curMessage.media.document &&
          (curMessage.media.document.sticker || curMessage.media.document.audioTitle) &&
          (curMessage.fromID != (prevMessage || {}).fromID || !(prevMessage || {}).fwdFromID)) {
        delete curMessage.fwdFromID;
        curMessage._ = 'message';
      }

      if (curMessage.views &&
          !incrementedMessageViews[curMessage.mid]) {
        incrementedMessageViews[curMessage.mid] = true;
        needIncrementMessageViews.push(curMessage.mid);
        if (incrementMessageViewsTimeout === false) {
          incrementMessageViewsTimeout = setTimeout(incrementMessageViews, 10000);
        }
      }

      if (prevMessage &&
          // !curMessage.views &&
          prevMessage.fromID == curMessage.fromID &&
          !prevMessage.fwdFromID == !curMessage.fwdFromID &&
          prevMessage.viaBotID == curMessage.viaBotID &&
          !prevMessage.action &&
          !curMessage.action &&
          curMessage.date < prevMessage.date + 900) {

        var singleLine = curMessage.message && curMessage.message.length < 70 && curMessage.message.indexOf("\n") == -1 && !curMessage.reply_to_mid;
        if (groupFwd &&
            curMessage.fwdFromID &&
            curMessage.fwdFromID == prevMessage.fwdFromID &&
            curMessage.viaBotID == prevMessage.viaBotID) {
          curMessage.grouped = singleLine ? 'im_grouped_fwd_short' : 'im_grouped_fwd';
        } else {
          curMessage.grouped = !curMessage.fwdFromID && singleLine ? 'im_grouped_short' : 'im_grouped';
        }
        if (groupFwd && curMessage.fwdFromID) {
          if (!prevMessage.grouped) {
            prevMessage.grouped = 'im_grouped_fwd_start';
          }
          if (curMessage.grouped && i == len - 1) {
            curMessage.grouped += ' im_grouped_fwd_end';
          }
        }
      } else if (prevMessage || !i) {
        delete curMessage.grouped;

        if (groupFwd && prevMessage && prevMessage.grouped && prevMessage.fwdFromID) {
          prevMessage.grouped += ' im_grouped_fwd_end';
        }
      }
      if (!wasUpdated && prevGrouped != (prevMessage && prevMessage.grouped)) {
        wasUpdated = true;
      }
      prevMessage = curMessage;
      prevDay = curDay;
    }
    if (!wasUpdated && curGrouped != (prevMessage && prevMessage.grouped)) {
      wasUpdated = true;
    }

    return wasUpdated;
  }

  function getMessageThumb (message, thumbWidth, thumbHeight) {
    var thumbPhotoSize;
    var sticker = false;
    if (message.media) {
      switch (message.media._) {
        case 'messageMediaPhoto':
          thumbPhotoSize = AppPhotosManager.choosePhotoSize(message.media.photo, thumbWidth, thumbHeight);
          break;

        case 'messageMediaDocument':
          thumbPhotoSize = message.media.document.thumb;
          if (message.media.document.sticker) {
            sticker = true;
          }
          break;
      }
    }

    if (thumbPhotoSize && thumbPhotoSize._ != 'photoSizeEmpty') {
      var dim = calcImageInBox(thumbPhotoSize.w, thumbPhotoSize.h, thumbWidth, thumbHeight, true);

      var thumb = {
        width: dim.w,
        height: dim.h,
        location: thumbPhotoSize.location,
        size: thumbPhotoSize.size
      };
      if (sticker) {
        thumb.location.sticker = true;
      }

      return thumb;
    }

    return false;
  }

  function incrementMaxSeenID (maxID) {
    if (maxSeenID !== false && maxID && maxID > maxSeenID) {
      Storage.set({
        max_seen_msg: maxID
      });
    }
  }

  function notifyAboutMessage (message, options) {
    options = options || {};

    var peerID = getMessagePeer(message);
    var peerString;
    var notification = {},
        notificationMessage = false,
        notificationPhoto;

    var notifySettings = NotificationsManager.getNotifySettings();

    if (message.fwdFromID && options.fwd_count) {
      notificationMessage = fwdMessagesPluralize(options.fwd_count);
    } else if (message.message) {
      if (notifySettings.nopreview) {
        notificationMessage = _('conversation_message_sent');
      } else {
        notificationMessage = RichTextProcessor.wrapPlainText(message.message);
      }
    } else if (message.media) {
      switch (message.media._) {
        case 'messageMediaPhoto':
          notificationMessage = _('conversation_media_photo_raw');
          break;
        case 'messageMediaDocument':
          switch (message.media.document.type) {
            case 'gif':
              notificationMessage = _('conversation_media_gif_raw');
              break;
            case 'sticker':
              notificationMessage = _('conversation_media_sticker');
              var stickerEmoji = message.media.document.stickerEmojiRaw;
              if (stickerEmoji !== undefined) {
                notificationMessage = RichTextProcessor.wrapPlainText(stickerEmoji) + ' ' + notificationMessage;
              }
              break;
            case 'video':
              notificationMessage = _('conversation_media_video_raw');
              break;
            case 'voice':
            case 'audio':
              notificationMessage = _('conversation_media_audio_raw');
              break;
            default:
              notificationMessage = message.media.document.file_name || _('conversation_media_document_raw');
              break;
          }
          break;

        case 'messageMediaGeo':
        case 'messageMediaVenue':
          notificationMessage = _('conversation_media_location_raw');
          break;
        case 'messageMediaContact':
          notificationMessage = _('conversation_media_contact_raw');
          break;
        default:
          notificationMessage = _('conversation_media_attachment_raw');
          break;
      }
    } else if (message._ == 'messageService') {
      switch (message.action._) {
        case 'messageActionChatCreate':
          notificationMessage = _('conversation_group_created_raw');
          break;
        case 'messageActionChatEditTitle':
          notificationMessage = _('conversation_group_renamed_raw');
          break;
        case 'messageActionChatEditPhoto':
          notificationMessage = _('conversation_group_photo_updated_raw');
          break;
        case 'messageActionChatDeletePhoto':
          notificationMessage = _('conversation_group_photo_removed_raw');
          break;
        case 'messageActionChatAddUser':
        case 'messageActionChatAddUsers':
          notificationMessage = _('conversation_invited_user_message_raw');
          break;
        case 'messageActionChatReturn':
          notificationMessage = _('conversation_returned_to_group_raw');
          break;
        case 'messageActionChatJoined':
          notificationMessage = _('conversation_joined_group_raw');
          break;
        case 'messageActionChatDeleteUser':
          notificationMessage = _('conversation_kicked_user_message_raw');
          break;
        case 'messageActionChatLeave':
          notificationMessage = _('conversation_left_group_raw');
          break;
        case 'messageActionChatJoinedByLink':
          notificationMessage = _('conversation_joined_by_link_raw');
          break;
        case 'messageActionChannelCreate':
          notificationMessage = _('conversation_created_channel_raw');
          break;
        case 'messageActionChannelEditTitle':
          notificationMessage = _('conversation_changed_channel_name_raw');
          break;
        case 'messageActionChannelEditPhoto':
          notificationMessage = _('conversation_changed_channel_photo_raw');
          break;
        case 'messageActionChannelDeletePhoto':
          notificationMessage = _('conversation_removed_channel_photo_raw');
          break;
      }
    }


    if (peerID > 0) {
      var fromUser = AppUsersManager.getUser(message.from_id);
      var fromPhoto = AppUsersManager.getUserPhoto(message.from_id);

      notification.title = (fromUser.first_name || '') +
                           (fromUser.first_name && fromUser.last_name ? ' ' : '') +
                           (fromUser.last_name || '');
      if (!notification.title) {
        notification.title = fromUser.phone || _('conversation_unknown_user_raw');
      }

      notificationPhoto = fromPhoto;

      peerString = AppUsersManager.getUserString(peerID);

    } else {
      notification.title = AppChatsManager.getChat(-peerID).title || _('conversation_unknown_chat_raw');

      if (message.from_id > 0) {
        var fromUser = AppUsersManager.getUser(message.from_id);
        notification.title = (fromUser.first_name || fromUser.last_name || _('conversation_unknown_user_raw')) +
                             ' @ ' +
                             notification.title;
      }

      notificationPhoto = AppChatsManager.getChatPhoto(-peerID);

      peerString = AppChatsManager.getChatString(-peerID);
    }

    notification.title = RichTextProcessor.wrapPlainText(notification.title);

    notification.onclick = function () {
      $rootScope.$broadcast('history_focus', {
        peerString: peerString,
        messageID: message.flags & 16 ? message.mid : 0,
      });
    };

    notification.message = notificationMessage;
    notification.key = 'msg' + message.mid;
    notification.tag = peerString;

    if (notificationPhoto.location && !notificationPhoto.location.empty) {
      MtpApiFileManager.downloadSmallFile(notificationPhoto.location, notificationPhoto.size).then(function (blob) {
        if (message.pFlags.unread) {
          notification.image = blob;
          NotificationsManager.notify(notification);
        }
      });
    } else {
      NotificationsManager.notify(notification);
    }
  }

  var newMessagesHandlePromise = false;
  var newMessagesToHandle = {};
  var newDialogsHandlePromise = false;
  var newDialogsToHandle = {};
  var notificationsHandlePromise = false;
  var notificationsToHandle = {};

  function handleNewMessages () {
    $timeout.cancel(newMessagesHandlePromise);
    newMessagesHandlePromise = false;
    $rootScope.$broadcast('history_multiappend', newMessagesToHandle);
    newMessagesToHandle = {};
  }

  function handleNewDialogs () {
    $timeout.cancel(newDialogsHandlePromise);
    newDialogsHandlePromise = false;
    angular.forEach(newDialogsToHandle, function (dialog) {
      pushDialogToStorage(dialog);
    });
    $rootScope.$broadcast('dialogs_multiupdate', newDialogsToHandle);
    newDialogsToHandle = {};
  }

  function handleNotifications () {
    $timeout.cancel(notificationsHandlePromise);
    notificationsHandlePromise = false;

    var timeout = $rootScope.idle.isIDLE && StatusManager.isOtherDeviceActive() ? 30000 : 1000;
    angular.forEach(notificationsToHandle, function (notifyPeerToHandle) {
      notifyPeerToHandle.isMutedPromise.then(function (muted) {
        var topMessage = notifyPeerToHandle.top_message;
        if (muted ||
            !topMessage.pFlags.unread) {
          return;
        }
        setTimeout(function () {
          if (topMessage.pFlags.unread) {
            notifyAboutMessage(topMessage, {
              fwd_count: notifyPeerToHandle.fwd_count
            });
          }
        }, timeout);
      });
    });

    notificationsToHandle = {};
  }

  $rootScope.$on('apiUpdate', function (e, update) {
    // if (update._ != 'updateUserStatus') {
    //   console.log('on apiUpdate', update);
    // }
    switch (update._) {
      case 'updateMessageID':
        var randomID = update.random_id;
        var pendingData = pendingByRandomID[randomID];
        if (pendingData) {
          var peerID = pendingData[0];
          var channelID = AppPeersManager.isChannel(peerID) ? -peerID : 0;
          pendingByMessageID[AppMessagesIDsManager.getFullMessageID(update.id, channelID)] = randomID;
        }
        break;

      case 'updateNewMessage':
      case 'updateNewChannelMessage':
        var message = update.message,
            peerID = getMessagePeer(message),
            historyStorage = historiesStorage[peerID];

        if (update._ == 'updateNewChannelMessage') {
          var chat = AppChatsManager.getChat(-peerID);
          if (chat.pFlags && (chat.pFlags.left || chat.pFlags.kicked)) {
            break;
          }
        }

        saveMessages([message], {isNew: true});

        if (historyStorage !== undefined) {
          var history = historyStorage.history;
          if (history.indexOf(message.mid) != -1) {
            return false;
          }
          var topMsgID = history[0];
          history.unshift(message.mid);
          if (message.mid > 0 && message.mid < topMsgID) {
            history.sort(function (a, b) {
              return b - a;
            });
          }
          if (historyStorage.count !== null) {
            historyStorage.count++;
          }
        } else {
          historyStorage = historiesStorage[peerID] = {
            count: null,
            history: [message.mid],
            pending: []
          };
        }

        if (mergeReplyKeyboard(historyStorage, message)) {
          $rootScope.$broadcast('history_reply_markup', {peerID: peerID})
        }

        if (!message.pFlags.out && message.from_id) {
          AppUsersManager.forceUserOnline(message.from_id);
        }

        var randomID = pendingByMessageID[message.mid],
            pendingMessage;

        if (randomID) {
          if (pendingMessage = finalizePendingMessage(randomID, message)) {
            $rootScope.$broadcast('history_update', {peerID: peerID});
          }
          delete pendingByMessageID[message.mid];
        }

        if (!pendingMessage) {
          if (newMessagesToHandle[peerID] === undefined) {
            newMessagesToHandle[peerID] = [];
          }
          newMessagesToHandle[peerID].push(message.mid);
          if (!newMessagesHandlePromise) {
            newMessagesHandlePromise = $timeout(handleNewMessages, 0);
          }
        }

        var foundDialog = getDialogByPeerID(peerID);
        var dialog;
        var inboxUnread = !message.pFlags.out && message.pFlags.unread;

        if (foundDialog.length) {
          dialog = foundDialog[0];
          dialog.top_message = message.mid;
          if (inboxUnread) {
            dialog.unread_count++;
          }
        } else {
          SearchIndexManager.indexObject(peerID, AppPeersManager.getPeerSearchText(peerID), dialogsIndex);
          dialog = {
            peerID: peerID,
            unread_count: inboxUnread ? 1 : 0,
            top_message: message.mid
          };
        }
        dialog.index = generateDialogIndex(message.date);

        newDialogsToHandle[peerID] = dialog;
        if (!newDialogsHandlePromise) {
          newDialogsHandlePromise = $timeout(handleNewDialogs, 0);
        }

        if (inboxUnread &&
            ($rootScope.selectedPeerID != peerID || $rootScope.idle.isIDLE) &&
            !message.pFlags.silent) {

          var notifyPeer = message.flags & 16 ? message.from_id : peerID;
          var notifyPeerToHandle = notificationsToHandle[notifyPeer];
          if (notifyPeerToHandle === undefined) {
            notifyPeerToHandle = notificationsToHandle[notifyPeer] = {
              isMutedPromise: NotificationsManager.getPeerMuted(notifyPeer),
              fwd_count: 0,
              from_id: 0
            };
          }

          if (notifyPeerToHandle.from_id != message.from_id) {
            notifyPeerToHandle.from_id = message.from_id;
            notifyPeerToHandle.fwd_count = 0;
          }
          if (message.fwdFromID) {
            notifyPeerToHandle.fwd_count++;
          }

          notifyPeerToHandle.top_message = message;

          if (!notificationsHandlePromise) {
            notificationsHandlePromise = $timeout(handleNotifications, 1000);
          }
        }

        incrementMaxSeenID(message.id);
        break;

      case 'updateEditMessage':
      case 'updateEditChannelMessage':
        var message = update.message;
        var peerID = getMessagePeer(message);
        var channelID = message.to_id._ == 'peerChannel' ? -peerID : 0;
        var mid = AppMessagesIDsManager.getFullMessageID(message.id, channelID);
        if (messagesStorage[mid] === undefined) {
          break;
        }

        // console.trace(dT(), 'edit message', message);
        saveMessages([message], {isEdited: true});
        safeReplaceObject(messagesStorage[mid], message);

        var wasForHistory = messagesForHistory[mid];
        if (wasForHistory !== undefined) {
          delete messagesForHistory[mid];
          var newForHistory = wrapForHistory(mid);
          safeReplaceObject(wasForHistory, newForHistory);
          messagesForHistory[mid] = wasForHistory;
        }

        if (message.clear_history) {
          var foundDialog = getDialogByPeerID(peerID);
          if (foundDialog[0] &&
              foundDialog[0].top_message == mid) {
            $rootScope.$broadcast('dialog_flush', {peerID: peerID});
          } else {
            $rootScope.$broadcast('history_delete', {peerID: peerID, msgs: [mid]});
          }
        } else {
          $rootScope.$broadcast('message_edit', {
            peerID: peerID,
            id: message.id,
            mid: mid
          });
        }
        break;

      case 'updateReadHistoryInbox':
      case 'updateReadHistoryOutbox':
      case 'updateReadChannelInbox':
      case 'updateReadChannelOutbox':
        var isOut = update._ == 'updateReadHistoryOutbox' || update._ == 'updateReadChannelOutbox';
        var channelID = update.channel_id;
        var maxID = AppMessagesIDsManager.getFullMessageID(update.max_id, channelID);
        var peerID = channelID ? -channelID : AppPeersManager.getPeerID(update.peer);
        var foundDialog = getDialogByPeerID(peerID);
        var history = (historiesStorage[peerID] || {}).history || [];
        var newUnreadCount = false;
        var length = history.length;
        var foundAffected = false;
        var messageID, message, i;

        if (peerID > 0 && isOut) {
          AppUsersManager.forceUserOnline(peerID);
        }

        for (i = 0; i < length; i++) {
          messageID = history[i];
          if (messageID > maxID) {
            continue;
          }
          message = messagesStorage[messageID];

          if (message.pFlags.out != isOut) {
            continue;
          }
          if (!message.pFlags.unread) {
            break;
          }
          // console.log('read', messageID, message.pFlags.unread, message);
          if (message && message.pFlags.unread) {
            message.pFlags.unread = false;
            if (messagesForHistory[messageID]) {
              messagesForHistory[messageID].pFlags.unread = false;
              if (!foundAffected) {
                foundAffected = true;
              }
            }
            if (messagesForDialogs[messageID]) {
              messagesForDialogs[messageID].pFlags.unread = false;
            }
            if (!message.pFlags.out) {
              if (foundDialog[0]) {
                newUnreadCount = --foundDialog[0].unread_count;
              }
              NotificationsManager.cancel('msg' + messageID);
            }
          }
        }
        if (foundDialog[0]) {
          if (!isOut &&
              newUnreadCount &&
              foundDialog[0].top_message <= maxID) {
            newUnreadCount = foundDialog[0].unread_count = 0;
          }
          var dialogKey = isOut ? 'read_outbox_max_id' : 'read_inbox_max_id';
          foundDialog[0][dialogKey] = maxID;
        }

        if (newUnreadCount !== false) {
          $rootScope.$broadcast('dialog_unread', {peerID: peerID, count: newUnreadCount});
        }
        if (foundAffected) {
          $rootScope.$broadcast('messages_read');
        }
        break;

      case 'updateReadMessagesContents':
        var messages = update.messages;
        var len = messages.length;
        var i, messageID, message, historyMessage;
        for (i = 0; i < len; i++) {
          messageID = messages[i];
          if (message = messagesStorage[messageID]) {
            delete message.pFlags.media_unread;
          }
          if (historyMessage = messagesForHistory[messageID]) {
            delete historyMessage.pFlags.media_unread;
          }
        }
        break;

      case 'updateDeleteMessages':
      case 'updateDeleteChannelMessages':
        var dialogsUpdated = {};
        var historiesUpdated = {};
        var channelID = update.channel_id;
        var messageID, message, i, peerID, foundDialog, history;
        var peerMessagesToHandle, peerMessagesHandlePos;

        for (i = 0; i < update.messages.length; i++) {
          messageID = AppMessagesIDsManager.getFullMessageID(update.messages[i], channelID);
          message = messagesStorage[messageID];
          if (message) {
            peerID = getMessagePeer(message);
            history = historiesUpdated[peerID] || (historiesUpdated[peerID] = {count: 0, unread: 0, msgs: {}});

            if (!message.pFlags.out && message.pFlags.unread) {
              history.unread++;
              NotificationsManager.cancel('msg' + messageID);
            }
            history.count++;
            history.msgs[messageID] = true;

            if (messagesForHistory[messageID]) {
              messagesForHistory[messageID].deleted = true;
              delete messagesForHistory[messageID];
            }
            if (messagesForDialogs[messageID]) {
              messagesForDialogs[messageID].deleted = true;
              delete messagesForDialogs[messageID];
            }
            message.deleted = true;
            messagesStorage[messageID] = {
              deleted: true,
              id: messageID,
              from_id: message.from_id,
              to_id: message.to_id,
              flags: message.flags,
              pFlags: message.pFlags,
              date: message.date
            };

            peerMessagesToHandle = newMessagesToHandle[peerID];
            if (peerMessagesToHandle && peerMessagesToHandle.length) {
              peerMessagesHandlePos = peerMessagesToHandle.indexOf(messageID);
              if (peerMessagesHandlePos != -1) {
                peerMessagesToHandle.splice(peerMessagesHandlePos);
              }
            }
          }
        }

        angular.forEach(historiesUpdated, function (updatedData, peerID) {
          var historyStorage = historiesStorage[peerID];
          if (historyStorage !== undefined) {
            var newHistory = [],
                newPending = [];
            for (var i = 0; i < historyStorage.history.length; i++) {
              if (!updatedData.msgs[historyStorage.history[i]]) {
                newHistory.push(historyStorage.history[i]);
              }
            }
            historyStorage.history = newHistory;
            if (updatedData.count &&
                historyStorage.count !== null &&
                historyStorage.count > 0) {
              historyStorage.count -= updatedData.count;
              if (historyStorage.count < 0) {
                historyStorage.count = 0;
              }
            }

            for (var i = 0; i < historyStorage.pending.length; i++) {
              if (!updatedData.msgs[historyStorage.pending[i]]) {
                newPending.push(historyStorage.pending[i]);
              }
            }
            historyStorage.pending = newPending;

            $rootScope.$broadcast('history_delete', {peerID: peerID, msgs: updatedData.msgs});
          }

          var foundDialog = getDialogByPeerID(peerID)[0];
          if (foundDialog) {
            if (updatedData.unread) {
              foundDialog.unread_count -= updatedData.unread;

              $rootScope.$broadcast('dialog_unread', {
                peerID: peerID,
                count: foundDialog.unread_count
              });
            }

            if (updatedData.msgs[foundDialog.top_message]) {
              reloadConversation(peerID);
            }
          }
        });
        break;

      case 'updateChannel':
        var channelID = update.channel_id;
        var peerID = -channelID;
        var channel = AppChatsManager.getChat(channelID);

        var needDialog = channel._ == 'channel' && (!channel.pFlags.left && !channel.pFlags.kicked);
        var foundDialog = getDialogByPeerID(peerID);
        var hasDialog = foundDialog.length > 0;

        var canViewHistory = channel._ == 'channel' && (channel.username || !channel.pFlags.left && !channel.pFlags.kicked) && true || false;
        var hasHistory = historiesStorage[peerID] !== undefined;

        if (canViewHistory != hasHistory) {
          delete historiesStorage[peerID];
          $rootScope.$broadcast('history_forbidden', peerID);
        }
        if (hasDialog != needDialog) {
          if (needDialog) {
            reloadConversation(-channelID);
          } else {
            if (foundDialog[0]) {
              dialogsStorage.dialogs.splice(foundDialog[1], 1);
              $rootScope.$broadcast('dialog_drop', {peerID: peerID});
            }
          }
        }
        break;

      case 'updateChannelReload':
        var channelID = update.channel_id;
        var peerID = -channelID;
        var foundDialog = getDialogByPeerID(peerID);
        if (foundDialog[0]) {
          dialogsStorage.dialogs.splice(foundDialog[1], 1);
        }
        delete historiesStorage[peerID];
        reloadConversation(-channelID).then(function () {
          $rootScope.$broadcast('history_reload', peerID);
        });
        break;

      case 'updateChannelMessageViews':
        var views = update.views;
        var mid = AppMessagesIDsManager.getFullMessageID(update.id, update.channel_id);
        var message = getMessage(mid);
        if (message && message.views && message.views < views) {
          message.views = views;
          $rootScope.$broadcast('message_views', {
            mid: mid,
            views: views
          });
        }
        break;

      case 'updateDraftMessage':
        var peerID = AppPeersManager.getPeerID(update.peer);
        var draft = DraftsManager.saveDraft(peerID, update.draft);

        var dialog = getDialogByPeerID(peerID)[0];
        if (dialog) {
          if (dialog && draft && draft.date) {
            dialog.index = generateDialogIndex(draft.date);
            pushDialogToStorage(dialog);
          }
          $rootScope.$broadcast('dialog_draft', {
            peerID: peerID,
            draft: draft
          });
        }
        break;
    }
  });

  function reloadConversation (peerID) {
    return MtpApiManager.invokeApi('messages.getPeerDialogs', {
      peers: [
        AppPeersManager.getInputPeerByID(peerID)
      ]
    }).then(function (dialogsResult) {
      AppUsersManager.saveApiUsers(dialogsResult.users);
      AppChatsManager.saveApiChats(dialogsResult.chats);
      saveMessages(dialogsResult.messages);

      var updatedDialogs = {};
      var hasUpdated = false;
      angular.forEach(dialogsResult.dialogs, function (dialog) {
        if (dialog.top_message) {
          saveConversation(dialog);
          if (getDialogByPeerID(dialog.peerID).length) {
            $rootScope.$broadcast('dialog_top', dialog);
          } else {
            updatedDialogs[dialog.peerID] = dialog;
            hasUpdated = true;
          }
        } else {
          var peerID = AppPeersManager.getPeerID(dialog.peer);
          var foundDialog = getDialogByPeerID(peerID);
          if (foundDialog.length) {
            dialogsStorage.dialogs.splice(foundDialog[1], 1);
            $rootScope.$broadcast('dialog_drop', {peerID: peerID});
          }
        }
      });
      if (hasUpdated) {
        $rootScope.$broadcast('dialogs_multiupdate', updatedDialogs);
      }
    });
  }

  $rootScope.$on('webpage_updated', function (e, eventData) {
    angular.forEach(eventData.msgs, function (msgID) {
      var historyMessage = messagesForHistory[msgID];
      if (historyMessage) {
        historyMessage.media = {
          _: 'messageMediaWebPage',
          webpage: AppWebPagesManager.wrapForHistory(eventData.id)
        };
        $rootScope.$broadcast('message_edit', {
          peerID: getMessagePeer(historyMessage),
          id: historyMessage.id,
          mid: msgID,
          justMedia: true
        });
      }
    })
  });

  $rootScope.$on('draft_updated', function (e, eventData) {
    var peerID = eventData.peerID;
    var draft = eventData.draft;

    var dialog = getDialogByPeerID(peerID)[0];
    if (dialog) {
      if (dialog && draft && draft.date) {
        dialog.index = generateDialogIndex(draft.date);
        pushDialogToStorage(dialog);
      }
    }
  });

  return {
    getConversations: getConversations,
    getHistory: getHistory,
    getSearch: getSearch,
    getMessage: getMessage,
    getReplyKeyboard: getReplyKeyboard,
    readHistory: readHistory,
    readMessages: readMessages,
    flushHistory: flushHistory,
    deleteMessages: deleteMessages,
    sendText: sendText,
    sendFile: sendFile,
    sendOther: sendOther,
    forwardMessages: forwardMessages,
    startBot: startBot,
    convertMigratedPeer: convertMigratedPeer,
    getMessagePeer: getMessagePeer,
    getMessageThumb: getMessageThumb,
    getMessageShareLink: getMessageShareLink,
    clearDialogCache: clearDialogCache,
    wrapForDialog: wrapForDialog,
    wrapForHistory: wrapForHistory,
    wrapReplyMarkup: wrapReplyMarkup,
    wrapSingleMessage: wrapSingleMessage,
    regroupWrappedHistory: regroupWrappedHistory
  }
})

.service('AppMessagesIDsManager', function () {
  var channelLocals = {};
  var channelsByLocals = {};
  var channelCurLocal = 0;
  var fullMsgIDModulus = 4294967296;

  return {
    getFullMessageID: getFullMessageID,
    getMessageIDInfo: getMessageIDInfo,
    getMessageLocalID: getMessageLocalID,
    splitMessageIDsByChannels: splitMessageIDsByChannels,
  }

  function getFullMessageID (msgID, channelID) {
    if (!channelID || msgID <= 0) {
      return msgID;
    }
    msgID = getMessageLocalID(msgID);
    var localStart = channelLocals[channelID];
    if (!localStart) {
      localStart = (++channelCurLocal) * fullMsgIDModulus;
      channelsByLocals[localStart] = channelID;
      channelLocals[channelID] = localStart;
    }

    return localStart + msgID;
  }

  function getMessageIDInfo (fullMsgID) {
    if (fullMsgID < fullMsgIDModulus) {
      return [fullMsgID, 0];
    }
    var msgID = fullMsgID % fullMsgIDModulus;
    var channelID = channelsByLocals[fullMsgID - msgID];

    return [msgID, channelID];
  }

  function getMessageLocalID (fullMsgID) {
    if (!fullMsgID) {
      return 0;
    }
    return fullMsgID % fullMsgIDModulus;
  }

  function splitMessageIDsByChannels (mids) {
    var msgIDsByChannels = {};
    var midsByChannels = {};
    var i, mid, msgChannel, channelID;
    for (i = 0; i < mids.length; i++) {
      mid = mids[i];
      msgChannel = getMessageIDInfo(mid);
      channelID = msgChannel[1];
      if (msgIDsByChannels[channelID] === undefined) {
        msgIDsByChannels[channelID] = [];
        midsByChannels[channelID] = [];
      }
      msgIDsByChannels[channelID].push(msgChannel[0]);
      midsByChannels[channelID].push(mid);
    }

    return {
      msgIDs: msgIDsByChannels,
      mids: midsByChannels
    };
  }
})