var http = require('http');
var url = require('url');
var winston = require('winston');
var strftime = require('strftime');
var strptime = require('micro-strptime').strptime;
var request = require('request');
var striptags = require('striptags');
var fs = require('fs');
var ini = require('ini');

var config = ini.parse(fs.readFileSync(__dirname + '/config.ini', 'utf-8'));

var last_message_hash;

var logger = new (winston.Logger)({
  transports: [
    new (winston.transports.Console)({
      timestamp: function() {
        return strftime('%F %T', new Date());
      }
    }),
    new (winston.transports.DailyRotateFile)({
      filename: __dirname + '/logs/log',
      timestamp: function() {
        return strftime('%F %T', new Date());
      }
    })
  ]
});


var ym = require('yahoomessenger');
ym.newInstance();

function onReady(){
  ym.login(config.globals.username, config.globals.password);
}

function onLoginSuccessful(data) {
    logger.info('Login successful as ' + data.firstname + ' ' + data.lastname + ' (' + data.user_id + ')', {data: data});
}

function sendIgnoreResponse(destination, message) {
    ym.sendPM(destination, "Pesan anda diabaikan, silahkan diulang beberapa saat lagi jika diperlukan: " + message);
}

function onPm(data) {
    logger.info('onPM()', {data: data});
    
    var message = striptags(data.message);
    var new_message_hash = data.sender + ': ' + message;
    
    if (last_message_hash == new_message_hash) {
        return;
    }
    
    last_message_hash = new_message_hash;
    ym.sendPM(data.sender, "Pesan anda telah diterima dan akan segera diproses: " + message);
    
    forwardMessageToEvo(data.sender, message, formatTimestamp(data.time));
}

function onOfflinePM(data) {
    logger.info('onOfflinePM()', {data: data});
    sendIgnoreResponse(data.sender, data.message);
}

function onBuddyAddRequest(data) {
    logger.info('onBuddyAddRequest()', {data: data});
    ym.acceptAddBuddy(data.username);
    logger.info('Accept buddy add request: ' + data.username, {data: data});
}

function onHttpIncomingMessage(request, response) {
    var qs = url.parse(request.url, true).query;
    logger.info("onHttpIncomingMessage()", {qs: qs});
    
    var destination = qs.to.replace(config.globals.msisdn_suffix, '');
    ym.sendPM(destination, qs.msg);
    response.end('OK');
}

function formatTimestamp(ts) {
    var _ts = strptime(ts, '%A %b %d %Y %H:%M:%S GMT%z');
    return strftime('%F %T', _ts);
}

function forwardMessageToEvo(sender, message, ts) {
    var msisdn = sender + config.globals.msisdn_suffix;
    var opts = {
        url: config.globals.evo_url,
        qs: {
            msg: message,
            msisdn: msisdn,
            smsc: config.globals.smsc,
            ts: ts
        }
    };
    
    logger.info("Forwarding message to evo", {request_opts: opts});
    request(opts, function(err, response, body) {
        if (err) {
            logger.warn('Error forwarding to evo: ' + err);
            return;
        }
    });
}

function createHttpServer() {
    logger.verbose('createHttpServer()');
    
    var httpServer = http.createServer(onHttpIncomingMessage);
    httpServer.listen(config.globals.listen_port, function(){
        logger.info("HTTP server listening on " + config.globals.listen_port);
    });
}

ym.on('ready', onReady);
ym.on('loginSuccessful', onLoginSuccessful);
ym.on('pm', onPm);
ym.on('buddyAddRequest', onBuddyAddRequest);