Support flush history in private supergroups

app/js/controllers.js

@@ -469,6 +469,7 @@ angular.module('myApp.controllers', ['myApp.i18n'])
         } else {
           $scope.$broadcast('ui_history_focus')
         }
+        $modalStack.dismissAll()
       } else {
         var peerID = AppPeersManager.getPeerID(peerData.peerString)
         var username = AppPeersManager.getPeer(peerID).username
@@ -4003,6 +4004,14 @@ angular.module('myApp.controllers', ['myApp.i18n'])
       })
     }
 
+    $scope.flushHistory = function () {
+      ErrorService.confirm({type: 'HISTORY_FLUSH'}).then(function () {
+        AppMessagesManager.flushHistory(-$scope.chatID).then(function () {
+          $rootScope.$broadcast('history_focus', {peerString: $scope.chatFull.peerString})
+        })
+      })
+    }
+
     $scope.joinChannel = function () {
       MtpApiManager.invokeApi('channels.joinChannel', {
         channel: AppChatsManager.getChannelInput($scope.chatID)

app/js/messages_manager.js

@@ -1262,6 +1262,26 @@ angular.module('myApp.services')
     }
 
     function flushHistory (peerID, justClear) {
+      if (AppPeersManager.isChannel(peerID)) {
+        return getHistory(peerID, false, 1).then(function (historyResult) {
+          var channelID = -peerID
+          var maxID = AppMessagesIDsManager.getMessageLocalID(historyResult.history[0] || 0)
+          return MtpApiManager.invokeApi('channels.deleteHistory', {
+            channel: AppChatsManager.getChannelInput(channelID),
+            max_id: maxID
+          }).then(function () {
+            ApiUpdatesManager.processUpdateMessage({
+              _: 'updateShort',
+              update: {
+                _: 'updateChannelAvailableMessages',
+                channel_id: channelID,
+                available_min_id: maxID
+              }
+            })
+            return true
+          })
+        })
+      }
       return doFlushHistory(AppPeersManager.getInputPeerByID(peerID), justClear).then(function () {
         if (justClear) {
           $rootScope.$broadcast('dialog_flush', {peerID: peerID})
@@ -3360,6 +3380,22 @@ angular.module('myApp.services')
           }
           break
 
+        case 'updateChannelAvailableMessages':
+          var channelID = update.channel_id
+          var messages = []
+          var peerID = -channelID
+          var history = (historiesStorage[peerID] || {}).history || []
+          if (history.length) {
+            angular.forEach(history, function (msgID) {
+              if (!update.available_min_id ||
+                  AppMessagesIDsManager.getMessageLocalID(msgID) <= update.available_min_id) {
+                messages.push(msgID)
+              }
+            })
+          }
+          update.messages = messages
+          console.warn(dT(), update, channelID, messages, history)
+
         case 'updateDeleteMessages':
         case 'updateDeleteChannelMessages':
           var dialogsUpdated = {}

app/js/services.js

@@ -796,7 +796,7 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
       if (chatFull.participants && chatFull.participants._ == 'channelParticipants') {
         var isAdmin = chat.pFlags.creator || chat.pFlags.editor || chat.pFlags.moderator
         angular.forEach(chatFull.participants.participants, function (participant) {
-          participant.canLeave = !chat.pFlags.creator && participant._ == 'channelParticipantSelf'
+          participant.canLeave = participant._ == 'channelParticipantSelf'
           participant.canKick = isAdmin && participant._ == 'channelParticipant'
 
           // just for order by last seen

app/partials/desktop/channel_modal.html

@@ -99,10 +99,19 @@
 
       </div>
 
-      <div class="md_modal_iconed_section_wrap md_modal_iconed_section_link" ng-if="chatFull.chat.pFlags.creator || !chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
+      <div class="md_modal_iconed_section_wrap md_modal_iconed_section_link" ng-if="isMegagroup && !chatFull.chat.username && !chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked">
         <i class="md_modal_section_icon md_modal_section_icon_more"></i>
 
-        <div class="md_modal_section_link_wrap" ng-if="!chatFull.chat.pFlags.creator && !chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
+        <div class="md_modal_section_link_wrap">
+          <a class="md_modal_section_link" ng-click="flushHistory()" my-i18n="group_modal_menu_clear_history"></a>
+        </div>
+
+      </div>
+
+      <div class="md_modal_iconed_section_wrap md_modal_iconed_section_link" ng-if="!chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
+        <i class="md_modal_section_icon md_modal_section_icon_more"></i>
+
+        <div class="md_modal_section_link_wrap" ng-if="!chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
           <a class="md_modal_section_link" ng-click="leaveChannel()" my-i18n="channel_modal_leave_channel"></a>
         </div>
 

app/partials/mobile/channel_modal.html

@@ -117,7 +117,11 @@
       </a>
     </div>
 
-    <div class="mobile_modal_action_wrap" ng-if="!chatFull.chat.pFlags.creator && !chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
+    <div class="mobile_modal_action_wrap" ng-if="isMegagroup && !chatFull.chat.username && !chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked">
+      <a class="mobile_modal_action" ng-click="flushHistory()" my-i18n="group_modal_menu_clear_history"></a>
+    </div>
+
+    <div class="mobile_modal_action_wrap" ng-if="!chatFull.chat.pFlags.left && !chatFull.chat.pFlags.kicked && !isMegagroup">
       <a class="mobile_modal_action" ng-click="leaveChannel()" my-i18n="channel_modal_leave_channel"></a>
     </div>