/**
 * Copyright 2013 Calvin 'calzoneman' Montgomery
 *
 * Licensed under Creative Commons Attribution-NonCommercial 3.0
 * See http://creativecommons.org/licenses/by-nc/3.0/
 *
 */

var mysql = require('mysql-libmysqlclient');
var Config = require('./config.js');
var Rank = require('./rank.js');
// I should use the <noun><verb>er naming scheme more often
var InfoGetter = require('./get-info.js');
var Media = require('./media.js').Media;
var ChatCommand = require('./chatcommand.js');
var io = require('./server.js').io;

var Channel = function(name) {
    console.log("Opening channel " + name);
    this.name = name;
    this.registered = false;
    this.users = [];
    this.queue = [];
    this.library = {};
    this.currentPosition = -1;
    this.currentMedia = null;
    this.leader = null;
    this.recentChat = [];
    this.qlocked = true;
    this.poll = false;

    // Autolead stuff
    // Accumulator
    this.i = 0;
    // Time of last update
    this.time = new Date().getTime();

    this.loadMysql();
};

// Check if this channel is registered
// If it is, fetch the library
Channel.prototype.loadMysql = function() {
    var db = mysql.createConnectionSync();
    db.connectSync(Config.MYSQL_SERVER, Config.MYSQL_USER,
                   Config.MYSQL_PASSWORD, Config.MYSQL_DB);
    if(!db.connectedSync()) {
        console.log("MySQL Connection Failed");
        return false;
    }
    // Check if channel exists
    var query = 'SELECT * FROM channels WHERE name="{}"'
        .replace(/\{\}/, this.name);
    var results = db.querySync(query);
    if(!results) {
        console.log("channel query failed");
        return;
    }
    var rows = results.fetchAllSync();
    if(rows.length == 0) {
        console.log("Channel " + this.name + " is unregistered");
        return;
    }
    this.registered = true;

    // Load library
    var query = 'SELECT * FROM chan_{}_library'
        .replace(/\{\}/, this.name);
    var results = db.querySync(query);
    if(!results) {
        console.log("channel library query failed");
        return;
    }
    var rows = results.fetchAllSync();
    for(var i = 0; i < rows.length; i++) {
        this.library[rows[i].id] = new Media(rows[i].id, rows[i].title, rows[i].seconds, rows[i].type);
    }
    console.log("Loaded channel " + this.name + " from MySQL DB");
    db.closeSync();
}

// Creates a new channel record in the MySQL Database
// Currently unused, but might be useful if I add a registration page
Channel.prototype.createTables = function() {
    var db = mysql.createConnectionSync();
    db.connectSync(Config.MYSQL_SERVER, Config.MYSQL_USER,
                   Config.MYSQL_PASSWORD, Config.MYSQL_DB);
    if(!db.connectedSync()) {
        console.log("MySQL Connection Failed");
        return false;
    }
    // Create library table
    var query= "CREATE TABLE `chan_{}_library` \
                    (`id` VARCHAR(255) NOT NULL, \
                    `title` VARCHAR(255) NOT NULL, \
                    `seconds` INT NOT NULL, \
                    `playtime` VARCHAR(8) NOT NULL, \
                    `type` VARCHAR(2) NOT NULL, \
                    PRIMARY KEY (`id`)) \
                    ENGINE = MyISAM;"
        .replace(/\{\}/, this.name);
    var results = db.querySync(query);

    // Create rank table
    var query = "CREATE TABLE  `chan_{}_ranks` (\
                    `name` VARCHAR( 32 ) NOT NULL ,\
                    `rank` INT NOT NULL ,\
                    UNIQUE (\
                    `name`\
                    )\
                    ) ENGINE = MYISAM"
        .replace(/\{\}/, this.name);
    results = db.querySync(query) || results;

    // Insert into global channel table
    var query = 'INSERT INTO channels (`id`, `name`) VALUES (NULL, "{}")'
        .replace(/\{\}/, this.name);
    results = db.querySync(query) || results;
    db.closeSync();
    return results;
}

Channel.prototype.tryRegister = function(user) {
    if(this.registered) {
        user.socket.emit('registerChannel', {
            success: false,
            error: "This channel is already registered"
        });
    }
    else if(!user.loggedIn) {
        user.socket.emit('registerChannel', {
            success: false,
            error: "You must log in to register a channel"
        });

    }
    else if(!Rank.hasPermission(user, "registerChannel")) {
        user.socket.emit('registerChannel', {
            success: false,
            error: "You don't have permission to register this channel"
        });
    }
    else {
        if(this.createTables()) {
            this.registered = true;
            this.saveRank(user);
            user.socket.emit('registerChannel', {
                success: true,
            });
        }
        else {
            user.socket.emit('registerChannel', {
                success: false,
                error: "Unable to register channel, see an admin"
            });
        }
    }
}

// Retrieves a user's rank from the database
Channel.prototype.getRank = function(name) {
    if(!this.registered)
        return Rank.Guest;
    var db = mysql.createConnectionSync();
    db.connectSync(Config.MYSQL_SERVER, Config.MYSQL_USER,
                   Config.MYSQL_PASSWORD, Config.MYSQL_DB);
    if(!db.connectedSync()) {
        console.log("MySQL Connection Failed");
        return Rank.Guest;
    }
    var query = 'SELECT * FROM chan_{1}_ranks WHERE name="{2}"'
        .replace(/\{1\}/, this.name)
        .replace(/\{2\}/, name);
    var results = db.querySync(query);
    var rows = results.fetchAllSync();
    if(rows.length == 0) {
        return Rank.Guest;
    }

    db.closeSync();
    return rows[0].rank;
}

// Saves a user's rank to the database
Channel.prototype.saveRank = function(user) {
    if(!this.registered)
        return false;
    var db = mysql.createConnectionSync();
    db.connectSync(Config.MYSQL_SERVER, Config.MYSQL_USER,
                   Config.MYSQL_PASSWORD, Config.MYSQL_DB);
    if(!db.connectedSync()) {
        console.log("MySQL Connection Failed");
        return false;
    }
    var query = 'UPDATE chan_{1}_ranks SET rank="{2}" WHERE name="{3}"'
        .replace(/\{1\}/, this.name)
        .replace(/\{2\}/, user.rank)
        .replace(/\{3\}/, user.name);
    var results = db.querySync(query);
    // Gonna have to insert a new one, bugger
    if(!results.fetchAllSync) {
        var query = 'INSERT INTO chan_{1}_ranks (`name`, `rank`) VALUES ("{2}", "{3}")'
            .replace(/\{1\}/, this.name)
            .replace(/\{2\}/, user.name)
            .replace(/\{3\}/, user.rank);
        results = db.querySync(query);
    }
    db.closeSync();
    return results;
}

// Caches media metadata to the channel library.
// If the channel is registered, stores it in the database as well
Channel.prototype.addToLibrary = function(media) {
    this.library[media.id] = media;
    if(!this.registered)
        return;
    var db = mysql.createConnectionSync();
    db.connectSync(Config.MYSQL_SERVER, Config.MYSQL_USER,
                   Config.MYSQL_PASSWORD, Config.MYSQL_DB);
    if(!db.connectedSync()) {
        console.log("MySQL Connection Failed");
        return false;
    }
    var query = 'INSERT INTO chan_{1}_library VALUES ("{2}", "{3}", {4}, "{5}", "{6}")'
        .replace(/\{1\}/, this.name)
        .replace(/\{2\}/, media.id)
        .replace(/\{3\}/, media.title)
        .replace(/\{4\}/, media.seconds)
        .replace(/\{5\}/, media.duration)
        .replace(/\{6\}/, media.type);
    var results = db.querySync(query);
    db.closeSync();
    return results;
}

// Searches the local library for media titles containing query
Channel.prototype.searchLibrary = function(query) {
    query = query.toLowerCase();
    var results = [];
    for(var id in this.library) {
        if(this.library[id].title.toLowerCase().indexOf(query) != -1) {
            results.push(this.library[id]);
        }
    }
    results.sort(function(a, b) {
        var x = a.title.toLowerCase();
        var y = b.title.toLowerCase();

        return (x == y) ? 0 : (x < y ? -1 : 1);
    });
    return results;
}

// Called when a new user enters the channel
Channel.prototype.userJoin = function(user) {
    user.socket.join(this.name);
    // Prevent duplicate login
    if(user.name != "") {
        for(var i = 0; i < this.users.length; i++) {
            if(this.users[i].name == user.name) {
                user.name = "";
                user.loggedIn = false;
                user.socket.emit('login', {
                    success: false,
                    error: "The username " + user.name + " is already in use on this channel"
                });
            }
        }
    }
    // If the channel is empty and isn't registered, the first person
    // gets ownership of the channel (temporarily)
    if(this.users.length == 0 && !this.registered) {
        user.rank = (user.rank < Rank.Owner) ? Rank.Owner + 7 : user.rank;
        user.socket.emit('channelNotRegistered');
    }
    this.users.push(user);
    if(user.name != "") {
        this.broadcastNewUser(user);
    }
    this.updateUsercount();
    // Set the new guy up
    this.sendPlaylist(user);
    user.socket.emit('queueLock', {locked: this.qlocked});
    this.sendUserlist(user);
    this.sendRecentChat(user);
    if(this.poll) {
        user.socket.emit('newPoll', this.poll.packUpdate());
    }
    if(user.playerReady)
        this.sendMediaUpdate(user);
    console.log("/" + user.ip + " joined channel " + this.name);
}

// Called when a user leaves the channel
Channel.prototype.userLeave = function(user) {
    try {
        user.socket.leave(this.name);
    }
    catch(e) {}
    if(this.poll) {
        this.poll.unvote(user.ip);
        this.broadcastPollUpdate();
    }
    if(this.leader == user) {
        this.changeLeader("");
    }
    this.users.splice(this.users.indexOf(user), 1);
    this.updateUsercount();
    if(user.name != "") {
        this.sendAll('userLeave', {
            name: user.name
        });
    }
}

// Queues a new media
Channel.prototype.enqueue = function(data) {
    var idx = data.pos == "next" ? this.currentPosition + 1 : this.queue.length;
    // Try to look up cached metadata first
    if(data.id in this.library) {
        this.queue.splice(idx, 0, this.library[data.id]);
        this.sendAll('queue', {
            media: this.library[data.id].pack(),
            pos: idx
        });
    }
    // Query metadata from YouTube
    else if(data.type == "yt") {
        var callback = (function(chan, id) { return function(res, data) {
            if(res != 200) {
                return;
            }

            // Whoever decided on this variable name should be fired
            var seconds = data.entry.media$group.yt$duration.seconds;
            // This one's slightly better
            var title = data.entry.title.$t;
            var vid = new Media(id, title, seconds, "yt");
            chan.queue.splice(idx, 0, vid);
            chan.sendAll('queue', {
                media: vid.pack(),
                pos: idx
            });
            chan.addToLibrary(vid);
        }})(this, data.id);
        InfoGetter.getYTInfo(data.id, callback);
    }
    // Set up twitch metadata
    else if(data.type == "tw") {
        var media = new Media(data.id, "Twitch ~ " + data.id, 0, "tw");
        this.queue.splice(idx, 0, media);
        this.sendAll('queue', {
            media: media.pack(),
            pos: idx
        });
    }
    else if(data.type == "li") {
        var media = new Media(data.id, "Livestream ~ " + data.id, 0, "li");
        this.queue.splice(idx, 0, media);
        this.sendAll('queue', {
            media: media.pack(),
            pos: idx
        });
    }
    // Query metadata from Soundcloud
    else if(data.type == "sc") {
        var callback = (function(chan, id) { return function(res, data) {
            if(res != 200) {
                return;
            }

            var seconds = data.duration / 1000;
            var title = data.title;
            var vid = new Media(id, title, seconds, "sc");
            chan.queue.splice(idx, 0, vid);
            chan.sendAll('queue', {
                media: vid.pack(),
                pos: idx
            });
            chan.addToLibrary(vid);
        }})(this, data.id);
        InfoGetter.getSCInfo(data.id, callback);
    }
    // Query metadata from Vimeo
    else if(data.type == "vi") {
        var callback = (function(chan, id) { return function(res, data) {
            if(res != 200) {
                return;
            }

            data = data[0];
            var seconds = data.duration;
            var title = data.title;
            var vid = new Media(id, title, seconds, "vi");
            chan.queue.splice(idx, 0, vid);
            chan.sendAll('queue', {
                media: vid.pack(),
                pos: idx
            });
            chan.addToLibrary(vid);
        }})(this, data.id);
        InfoGetter.getVIInfo(data.id, callback);
    }

}

// Removes a media from the play queue
Channel.prototype.unqueue = function(data) {
    // Stop trying to break my server
    if(data.pos < 0 || data.pos >= this.queue.length)
        return;

    this.queue.splice(data.pos, 1);
    this.sendAll('unqueue', {
        pos: data.pos
    });

    if(data.pos < this.currentPosition) {
        this.currentPosition--;
        this.sendAll('updatePlaylistIdx', {
            idx: this.currentPosition
        });
    }
    if(data.pos == this.currentPosition) {
        this.currentPosition--;
        this.playNext();
    }
}

// Play the next media in the queue
Channel.prototype.playNext = function() {
    if(this.currentPosition + 1 >= this.queue.length) {
        this.currentMedia = null;
        return;
    }
    this.currentPosition++;
    this.currentMedia = this.queue[this.currentPosition];
    this.currentMedia.currentTime = 0;

    this.sendAll('mediaUpdate', this.currentMedia.packupdate());
    this.sendAll('updatePlaylistIdx', {
        idx: this.currentPosition
    });
    // Enable autolead for non-twitch
    if(this.leader == null && this.currentMedia.type != "tw" && this.currentMedia.type != "li") {
        this.time = new Date().getTime();
        channelVideoUpdate(this, this.currentMedia.id);
    }
}

Channel.prototype.setLock = function(locked) {
    this.qlocked = locked;
    this.sendAll('queueLock', {locked: locked});
    for(var i = 0; i < this.users.length; i++) {
        this.sendPlaylist(this.users[i]);
    }
}

// Synchronize to a sync packet from the leader
Channel.prototype.update = function(data) {
    if(this.currentMedia == null) {
        this.currentMedia = new Media(data.id, data.title, data.seconds, data.type);
        this.currentMedia.currentTime = data.currentTime;
    }
    else
        this.currentMedia.currentTime = data.seconds;
    this.sendAll('mediaUpdate', this.currentMedia.packupdate());
}

// Move something around in the queue
Channel.prototype.moveMedia = function(data) {
    if(data.src < 0 || data.src >= this.queue.length)
        return;
    if(data.dest < 0 || data.dest > this.queue.length)
        return;

    var media = this.queue[data.src];
    this.queue.splice(data.src, 1);
    this.queue.splice(data.dest, 0, media);
    this.sendAll('moveVideo', {
        src: data.src,
        dest: data.dest
    });

    if(data.src < this.currentPosition && data.dest >= this.currentPosition) {
        this.currentPosition--;
    }
    if(data.src > this.currentPosition && data.dest < this.currentPosition) {
        this.currentPosition++
    }
}

// Chat message from a user
Channel.prototype.chatMessage = function(user, msg) {
    if(msg.indexOf("/") == 0)
        ChatCommand.handle(this, user, msg);

    else if(msg.indexOf(">") == 0)
        this.sendMessage(user.name, msg, "greentext");

    else
        this.sendMessage(user.name, msg, "");
}

Channel.prototype.sendMessage = function(username, msg, msgclass) {
    // I don't want HTML from strangers
    msg = msg.replace(/</g, "&lt;").replace(/>/g, "&gt;");
    // Match URLs
    msg = msg.replace(/(((https?)|(ftp))(:\/\/[0-9a-zA-Z\.]+(:[0-9]+)?[^\s$]+))/, "<a href=\"$1\" target=\"_blank\">$1</a>");
    this.sendAll('chatMsg', {
        username: username,
        msg: msg,
        msgclass: msgclass
    });
    this.recentChat.push({
        username: username,
        msg: msg,
        msgclass: msgclass
    });
    if(this.recentChat.length > 15)
        this.recentChat.shift();
};

// Promotion!  Actor is the client who initiated the promotion, name is the
// name of the person being promoted
Channel.prototype.promoteUser = function(actor, name) {
    var receiver;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            receiver = this.users[i];
            break;
        }
    }

    if(receiver) {
        // You can only promote someone if you are 2 ranks or higher above
        // them.  This way you can't promote them to your rank and end
        // up in a situation where you can't demote them
        if(actor.rank > receiver.rank + 1) {
            receiver.rank++;
            if(receiver.loggedIn) {
                this.saveRank(receiver);
            }
            this.broadcastRankUpdate(receiver);
        }
    }
}

// You're fired
Channel.prototype.demoteUser = function(actor, name) {
    var receiver;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            receiver = this.users[i];
            break;
        }
    }

    if(receiver) {
        // Wouldn't it be funny if you could demote people who rank higher
        // than you?  No, it wouldn't.
        if(actor.rank > receiver.rank) {
            receiver.rank--;
            if(receiver.loggedIn) {
                this.saveRank(receiver);
            }
            this.broadcastRankUpdate(receiver);
        }
    }
}

// Manual leader.  This shouldn't be necessary since the server autoleads,
// but you never know
Channel.prototype.changeLeader = function(name) {
    if(this.leader != null) {
        var old = this.leader;
        this.leader = null;
        this.broadcastRankUpdate(old);
    }
    if(name == "") {
        if(this.currentMedia != null) {
            this.time = new Date().getTime();
            this.i = 0;
            channelVideoUpdate(this, this.currentMedia.id);
        }
        return;
    }
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            this.leader = this.users[i];
            this.broadcastRankUpdate(this.leader);
        }
    }
}

// Send the userlist to a client
// Do you know you're all my very best friends?
Channel.prototype.sendUserlist = function(user) {
    var users = [];
    for(var i = 0; i < this.users.length; i++) {
        // Skip people who haven't logged in
        if(this.users[i].name != "") {
            users.push({
                name: this.users[i].name,
                rank: this.users[i].rank,
                leader: this.users[i] == this.leader
            });
        }
    }
    user.socket.emit('userlist', users)
}

Channel.prototype.updateUsercount = function() {
    this.sendAll('usercount', {
        count: this.users.length
    });
}

// Send the play queue
Channel.prototype.sendPlaylist = function(user) {
    user.socket.emit('playlist', {
        pl: this.queue
    });
    user.socket.emit('updatePlaylistIdx', {
        idx: this.currentPosition
    });
}

// Send the last 15 messages for context
Channel.prototype.sendRecentChat = function(user) {
    for(var i = 0; i < this.recentChat.length; i++) {
        user.socket.emit('chatMsg', this.recentChat[i]);
    }
}

// Send a sync packet
Channel.prototype.sendMediaUpdate = function(user) {
    if(this.currentMedia != null) {
        user.socket.emit('mediaUpdate', this.currentMedia.packupdate());
    }
    else {
        console.log('currentMedia is null');
    }
}

// Sent when someone logs in, to add them to the user list
Channel.prototype.broadcastNewUser = function(user) {
    this.sendAll('addUser', {
        name: user.name,
        rank: user.rank,
        leader: this.leader == user
    });
}

// Someone's rank changed, or their leadership status changed
Channel.prototype.broadcastRankUpdate = function(user) {
    this.sendAll('updateUser', {
        name: user.name,
        rank: user.rank,
        leader: this.leader == user
    });
}

Channel.prototype.broadcastPoll = function() {
    this.sendAll('newPoll', this.poll.packUpdate());
}

Channel.prototype.broadcastPollUpdate = function() {
    this.sendAll('updatePoll', this.poll.packUpdate());
}

Channel.prototype.broadcastPollClose = function() {
    this.sendAll('closePoll');
}

// Send to ALL the clients!
Channel.prototype.sendAll = function(message, data) {
    io.sockets.in(this.name).emit(message, data);
}

// Autolead yay
function channelVideoUpdate(chan, id) {
    // Someone changed the video or there's a manual leader, so your
    // argument is invalid
    if(chan.currentMedia == null || id != chan.currentMedia.id || chan.leader != null)
        return;
    // Add dt since last update
    chan.currentMedia.currentTime += (new Date().getTime() - chan.time)/1000.0;
    chan.time = new Date().getTime();
    // Video over, move on to next
    if(chan.currentMedia.currentTime > chan.currentMedia.seconds) {
        chan.playNext();
    }
    // Every ~5 seconds send a sync packet to everyone
    else if(chan.i % 5 == 0)
        chan.sendAll('mediaUpdate', chan.currentMedia.packupdate());
    chan.i++;
    // Do it all over again in about a second
    setTimeout(function() { channelVideoUpdate(chan, id); }, 1000);
}

exports.Channel = Channel;