/**
 * This module is started with bin/run.sh. It sets up a Express HTTP and a Socket.IO Server. 
 * Static file Requests are answered directly from this module, Socket.IO messages are passed 
 * to MessageHandler and minfied requests are passed to minified.
 */

/*
 * 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var ERR = require("async-stacktrace");
var log4js = require('log4js');
var os = require("os");
var socketio = require('socket.io');
var fs = require('fs');
var settings = require('./utils/Settings');
var db = require('./db/DB');
var async = require('async');
var express = require('express');
var path = require('path');
var minify = require('./utils/Minify');
var formidable = require('formidable');
var plugins = require("./pluginfw/plugins");
var hooks = require("./pluginfw/hooks");
var apiHandler;
var exportHandler;
var importHandler;
var exporthtml;
var readOnlyManager;
var padManager;
var securityManager;
var socketIORouter;

//try to get the git version
var version = "";
try
{
  var rootPath = path.normalize(__dirname + "/../")
  var ref = fs.readFileSync(rootPath + ".git/HEAD", "utf-8");
  var refPath = rootPath + ".git/" + ref.substring(5, ref.indexOf("\n"));
  version = fs.readFileSync(refPath, "utf-8");
  version = version.substring(0, 7);
  console.log("Your Etherpad Lite git version is " + version);
}
catch(e) 
{
  console.warn("Can't get git version for server header\n" + e.message)
}

console.log("Report bugs at https://github.com/Pita/etherpad-lite/issues")

var serverName = "Etherpad-Lite " + version + " (http://j.mp/ep-lite)";

//cache 6 hours
exports.maxAge = 1000*60*60*6;

//set loglevel
log4js.setGlobalLogLevel(settings.loglevel);

async.waterfall([
  //initalize the database
  function (callback)
  {
    db.init(callback);
  },

  plugins.update,

  function (callback) {
    console.log(["plugins", plugins.plugins]);
    console.log(["parts", plugins.parts]);
    console.log(["hooks", plugins.hooks]);
    callback();
  },

  //initalize the http server
  function (callback)
  {
    //create server
    var app = express.createServer();
    hooks.callAll("expressCreateServer", {"app": app});

    app.use(function (req, res, next) {
      res.header("Server", serverName);
      next();
    });

    //load modules that needs a initalized db
    readOnlyManager = require("./db/ReadOnlyManager");
    exporthtml = require("./utils/ExportHtml");
    exportHandler = require('./handler/ExportHandler');
    importHandler = require('./handler/ImportHandler');
    apiHandler = require('./handler/APIHandler');
    padManager = require('./db/PadManager');
    securityManager = require('./db/SecurityManager');
    socketIORouter = require("./handler/SocketIORouter");
    hasPadAccess = require("./padaccess");
    
    //install logging      
    var httpLogger = log4js.getLogger("http");
    app.configure(function() { hooks.callAll("expressConfigure", {"app": app}); });
    
    app.error(function(err, req, res, next){
      res.send(500);
      console.error(err.stack ? err.stack : err.toString());
      gracefulShutdown();
    });
    
    //serve timeslider.html under /p/$padname/timeslider
    app.get('/p/:pad/:rev?/export/:type', function(req, res, next)
    {
      var types = ["pdf", "doc", "txt", "html", "odt", "dokuwiki"];
      //send a 404 if we don't support this filetype
      if(types.indexOf(req.params.type) == -1)
      {
        next();
        return;
      }
      
      //if abiword is disabled, and this is a format we only support with abiword, output a message
      if(settings.abiword == null &&
         ["odt", "pdf", "doc"].indexOf(req.params.type) !== -1)
      {
        res.send("Abiword is not enabled at this Etherpad Lite instance. Set the path to Abiword in settings.json to enable this feature");
        return;
      }
      
      res.header("Access-Control-Allow-Origin", "*");
      
      hasPadAccess(req, res, function()
      {
        exportHandler.doExport(req, res, req.params.pad, req.params.type);
      });
    });
    
    //handle import requests
    app.post('/p/:pad/import', function(req, res, next)
    {
      //if abiword is disabled, skip handling this request
      if(settings.abiword == null)
      {
        next();
        return; 
      }
    
      hasPadAccess(req, res, function()
      {
        importHandler.doImport(req, res, req.params.pad);
      });
    });
    
    var apiLogger = log4js.getLogger("API");

    //This is for making an api call, collecting all post information and passing it to the apiHandler
    var apiCaller = function(req, res, fields)
    {
      res.header("Content-Type", "application/json; charset=utf-8");
    
      apiLogger.info("REQUEST, " + req.params.func + ", " + JSON.stringify(fields));
      
      //wrap the send function so we can log the response
      res._send = res.send;
      res.send = function(response)
      {
        response = JSON.stringify(response);
        apiLogger.info("RESPONSE, " + req.params.func + ", " + response);
        
        //is this a jsonp call, if yes, add the function call
        if(req.query.jsonp)
          response = req.query.jsonp + "(" + response + ")";
        
        res._send(response);
      }
      
      //call the api handler
      apiHandler.handle(req.params.func, fields, req, res);
    }
    
    //This is a api GET call, collect all post informations and pass it to the apiHandler
    app.get('/api/1/:func', function(req, res)
    {
      apiCaller(req, res, req.query)
    });

    //This is a api POST call, collect all post informations and pass it to the apiHandler
    app.post('/api/1/:func', function(req, res)
    {
      new formidable.IncomingForm().parse(req, function(err, fields, files) 
      {
        apiCaller(req, res, fields)
      });
    });
    
    //The Etherpad client side sends information about how a disconnect happen
    app.post('/ep/pad/connection-diagnostic-info', function(req, res)
    {
      new formidable.IncomingForm().parse(req, function(err, fields, files) 
      { 
        console.log("DIAGNOSTIC-INFO: " + fields.diagnosticInfo);
        res.end("OK");
      });
    });
    
    //The Etherpad client side sends information about client side javscript errors
    app.post('/jserror', function(req, res)
    {
      new formidable.IncomingForm().parse(req, function(err, fields, files) 
      { 
        console.error("CLIENT SIDE JAVASCRIPT ERROR: " + fields.errorInfo);
        res.end("OK");
      });
    });

    //let the server listen
    app.listen(settings.port, settings.ip);
    console.log("Server is listening at " + settings.ip + ":" + settings.port);

    var onShutdown = false;
    var gracefulShutdown = function(err)
    {
      if(err && err.stack)
      {
        console.error(err.stack);
      }
      else if(err)
      {
        console.error(err);
      }
      
      //ensure there is only one graceful shutdown running
      if(onShutdown) return;
      onShutdown = true;
    
      console.log("graceful shutdown...");
      
      //stop the http server
      app.close();

      //do the db shutdown
      db.db.doShutdown(function()
      {
        console.log("db sucessfully closed.");
        
        process.exit(0);
      });
      
      setTimeout(function(){
        process.exit(1);
      }, 3000);
    }

    //connect graceful shutdown with sigint and uncaughtexception
    if(os.type().indexOf("Windows") == -1)
    {
      //sigint is so far not working on windows
      //https://github.com/joyent/node/issues/1553
      process.on('SIGINT', gracefulShutdown);
    }
    
    process.on('uncaughtException', gracefulShutdown);

    //init socket.io and redirect all requests to the MessageHandler
    var io = socketio.listen(app);
    
    //this is only a workaround to ensure it works with all browers behind a proxy
    //we should remove this when the new socket.io version is more stable
    io.set('transports', ['xhr-polling']);
    
    var socketIOLogger = log4js.getLogger("socket.io");
    io.set('logger', {
      debug: function (str)
      {
        socketIOLogger.debug.apply(socketIOLogger, arguments);
      }, 
      info: function (str)
      {
        socketIOLogger.info.apply(socketIOLogger, arguments);
      },
      warn: function (str)
      {
        socketIOLogger.warn.apply(socketIOLogger, arguments);
      },
      error: function (str)
      {
        socketIOLogger.error.apply(socketIOLogger, arguments);
      },
    });
    
    //minify socket.io javascript
    if(settings.minify)
      io.enable('browser client minification');
    
    var padMessageHandler = require("./handler/PadMessageHandler");
    var timesliderMessageHandler = require("./handler/TimesliderMessageHandler");
    
    //Initalize the Socket.IO Router
    socketIORouter.setSocketIO(io);
    socketIORouter.addComponent("pad", padMessageHandler);
    socketIORouter.addComponent("timeslider", timesliderMessageHandler);
    
    callback(null);  
  }
]);