// twister_newmsgs.js
// 2013 Miguel Freitas
//
// Periodically check for new mentions and private messages (DMs)
// Update UI counters in top bar. Load/save state to localStorage.

// --- mentions ---

var _knownMentions = {}
var _lastMentionTime = 0;
var _newMentions = 0;
var _lastLocalMentionId = -1;
var PURGE_OLD_MENTIONS_TIMEOUT = 3600 * 24 * 30; // one month
var _newMentionsUpdated = false;
var _newDMsUpdated = false;

// process a mention received to check if it is really new
function processMention(user, mentionTime, data) {
    var key = user + ";" + mentionTime;
    var curTime = new Date().getTime() / 1000;
    if( mentionTime > curTime + 3600 * 2 ) {
        console.log("mention from the future will be ignored");
    } else {
        if( !(key in _knownMentions) ) {
            // mention must be somewhat recent compared to last known one to be considered new
            if( mentionTime + 3600 * 24 * 3 > _lastMentionTime ) {
                _newMentions++;
                _newMentionsUpdated = true;
                _lastMentionTime = Math.max(mentionTime,_lastMentionTime);
                data["isNew"] = true;
            }
            _knownMentions[key] = {mentionTime:mentionTime, data:data};
            purgeOldMentions();
            saveMentionsToStorage();
        }
    }
}

function purgeOldMentions() {
    for( var key in _knownMentions ) {
        if( _knownMentions.hasOwnProperty(key) ) {
            if( !_knownMentions[key].mentionTime || !_knownMentions[key].data ||
                _knownMentions[key].mentionTime + PURGE_OLD_MENTIONS_TIMEOUT < _lastMentionTime ) {
                delete _knownMentions[key];
            }
        }
    }
}

function saveMentionsToStorage() {
    var ns=$.initNamespaceStorage(defaultScreenName);
    ns.localStorage.set("knownMentions", _knownMentions);
    ns.localStorage.set("lastMentionTime", _lastMentionTime);
    ns.localStorage.set("newMentions", _newMentions);
    ns.localStorage.set("lastLocalMentionId",_lastLocalMentionId);
}

function loadMentionsFromStorage() {
    var ns=$.initNamespaceStorage(defaultScreenName);
    if( ns.localStorage.isSet("knownMentions") )
        _knownMentions = ns.localStorage.get("knownMentions");
    if( ns.localStorage.isSet("lastMentionTime") )
        _lastMentionTime = ns.localStorage.get("lastMentionTime");
    if( ns.localStorage.isSet("newMentions") )
        _newMentions = ns.localStorage.get("newMentions");
    if( ns.localStorage.isSet("lastLocalMentionId") )
        _lastLocalMentionId = ns.localStorage.get("lastLocalMentionId");
}

function requestMentionsCount() {
    // first: getmentions from torrents we follow
    twisterRpc("getmentions", [defaultScreenName, 100, {"since_id":_lastLocalMentionId}],
           function(args, data) {
               if( data ) {
                   for( var i = 0; i < data.length; i++ ) {
                       _lastLocalMentionId = Math.max(_lastLocalMentionId, data[i]["id"]);
                       var userpost = data[i]["userpost"];
                       processMention( userpost["n"], userpost["time"], data[i]);
                   }
                   $.MAL.updateNewMentionsUI(_newMentions);
               }
           }, null,
           function(req, ret) {console.log("getmentions API requires twister-core > 0.9.27");}, null);

    // second: get mentions from dht (not-following)
    dhtget( defaultScreenName, "mention", "m",
           function(args, data) {
               if( data ) {
                   for( var i = 0; i < data.length; i++ ) {
                       var userpost = data[i]["userpost"];
                       processMention( userpost["n"], userpost["time"], data[i]);
                   }
                   $.MAL.updateNewMentionsUI(_newMentions);
               }
           }, {},
           [10000,2000,3]); // use extended timeout parameters (requires twister_core >= 0.9.14)

    if( _newMentionsUpdated ) {
        _newMentionsUpdated = false;

        $.MAL.soundNotifyMentions();

        if ($.Options.getShowDesktopNotifMentionsOpt() === 'enable') {
            $.MAL.showDesktopNotif(false, polyglot.t('You got')+' '+polyglot.t('new_mentions', _newMentions)+'.', false,'twister_notification_new_mentions', $.Options.getShowDesktopNotifMentionsTimerOpt(), function() {
                if (window.location.pathname === '/home.html' || window.location.pathname === '/following.html' ) {
                     openMentionsModal();
                } else {
                    window.location.href = '/home.html#mentions?user='+defaultScreenName;
                }
            }, false)
        }
    }

    // was moved here from requestDMsCount() because that is not ticking right
    // we would place it with other notifications into separate notification center
    if( _newDMsUpdated ) {
        _newDMsUpdated = false;

        var newDMs = getNewDMsCount();
        if ( newDMs ) {
            $.MAL.soundNotifyDM();

            if ($.Options.getShowDesktopNotifDMsOpt() === 'enable') {
                $.MAL.showDesktopNotif(false, polyglot.t('You got')+' '+polyglot.t('new_direct_messages', newDMs)+'.', false, 'twister_notification_new_DMs', $.Options.getShowDesktopNotifDMsTimerOpt(), function() {
                    if (window.location.pathname === '/home.html' || window.location.pathname === '/following.html' ) {
                        window.location.hash = '#directmessages';
                    } else {
                        window.location.href = '/home.html#directmessages';
                    }
                }, false)
            }
        }
    }
}

function resetMentionsCount() {
    _newMentions = 0;
    for( var key in _knownMentions ) {
        if( _knownMentions.hasOwnProperty(key) && _knownMentions[key].data ) {
            delete _knownMentions[key].data["isNew"]
        }
    }
    saveMentionsToStorage();
    $.MAL.updateNewMentionsUI(_newMentions);
}

function initMentionsCount() {
    // polling mentions is a temporary solution
    loadMentionsFromStorage();
    $.MAL.updateNewMentionsUI(_newMentions);
    requestMentionsCount();
    setInterval("requestMentionsCount()", 10000);
}

function getMentionsData() {
    mentions = []
    for( var key in _knownMentions ) {
        if( _knownMentions.hasOwnProperty(key) && _knownMentions[key].data ) {
            mentions.push(_knownMentions[key].data);
        }
    }
    return mentions;
}

// --- direct messages ---

var _lastDMIdPerUser = {};
var _newDMsPerUser = {};

function saveDMsToStorage() {
    var ns=$.initNamespaceStorage(defaultScreenName);
    ns.localStorage.set("lastDMIdPerUser", _lastDMIdPerUser);
    ns.localStorage.set("newDMsPerUser", _newDMsPerUser);
}

function loadDMsFromStorage() {
    var ns=$.initNamespaceStorage(defaultScreenName);
    if( ns.localStorage.isSet("lastDMIdPerUser") )
        _lastDMIdPerUser = ns.localStorage.get("lastDMIdPerUser");
    if( ns.localStorage.isSet("newDMsPerUser") )
        _newDMsPerUser = ns.localStorage.get("newDMsPerUser");
}

function requestDMsCount() {
    var followList = [];
    for( var i = 0; i < followingUsers.length; i++ ) {
        followList.push({username:followingUsers[i]});
    }

    twisterRpc("getdirectmsgs", [defaultScreenName, 1, followList],
           function(req, dmUsers) {
               for( var u in dmUsers ) {
                   if( dmUsers.hasOwnProperty(u) ) {
                       var dmData = dmUsers[u][0];
                       if( (u in _lastDMIdPerUser) && (u in _newDMsPerUser) ) {
                           if( dmData.id != _lastDMIdPerUser[u] ) {
                               _newDMsPerUser[u] += (dmData.id - _lastDMIdPerUser[u]);
                               _newDMsUpdated = true;
                           }
                       } else {
                           _newDMsPerUser[u] = dmData.id+1;
                           _newDMsUpdated = true;
                       }
                       _lastDMIdPerUser[u] = dmData.id;
                   }
               }
               if( _newDMsUpdated ) {
                 saveDMsToStorage();
                 $.MAL.updateNewDMsUI(getNewDMsCount());
               }
           }, null,
           function(req, ret) {console.log("ajax error:" + ret);}, null);
}

function getNewDMsCount() {
    var newDMs = 0;

    for( var key in _newDMsPerUser ) {
        if( _newDMsPerUser.hasOwnProperty(key) ) {
            newDMs += _newDMsPerUser[key];
        }
    }
    return newDMs;
}

function resetNewDMsCountForUser(user, lastId) {
    _newDMsPerUser[user] = 0;
    _lastDMIdPerUser[user] = lastId;

    saveDMsToStorage();
    $.MAL.updateNewDMsUI(getNewDMsCount());
}

function initDMsCount() {
    loadDMsFromStorage();
    $.MAL.updateNewDMsUI(getNewDMsCount());
    requestDMsCount();
    //polling not needed: processNewPostsConfirmation will call requestDMsCount.
    //setInterval("requestDMsCount()", 5000);
}

function newmsgsChangedUser() {
    _knownMentions = {}
    _lastMentionTime = 0;
    _newMentions = 0;
}