var events = require('events');
var fs = require('fs');

var Server = require('./server');

var filePath = "servers.json";

var Manager = function (config) {
  this.config = config;
  this.serversArr = [];
  this.serversHash = {};
};

Manager.prototype = new events.EventEmitter();

Manager.prototype.addServer = (function (options) {
  var server = this._addServer(options);
  this.save();
  return server;
});

Manager.prototype.removeServer = (function (id) {
  var server = this.serversHash[id];

  if (!server) {
    return {};
  }

  var index = this.serversArr.indexOf(server);
  if (index > -1) {
    this.serversArr.splice(index, 1);
  }
  this.save();

  if (server.pid) {
    server.stop();
  }

  return server;
});

Manager.prototype._addServer = (function (data) {
  var server = new Server(this.config.path, this.config.type, data);
  this.serversArr.push(server);
  this.serversArr.sort(function(a, b) {
    return a.title.localeCompare(b.title);
  });
  this.serversHash[server.id] = server;

  var self = this;
  var statusChanged = function () {
    self.emit('servers');
  };
  server.on('state', statusChanged);

  return server;
});

Manager.prototype.getServer = (function (id) {
  return this.serversHash[id];
});

Manager.prototype.getServers = (function () {
  return this.serversArr;
});

Manager.prototype.load = (function () {
  var self = this;

  fs.readFile(filePath, function (err, data) {
    if (err) {
      console.log(err);
      return;
    }

    try {
      JSON.parse(data).forEach(function (server) {
        self._addServer(server);
      });
    } catch(e) {
        console.error("Manager load error: " + e);
    }
  });
});

Manager.prototype.save = (function () {
  var data = [];
  var self = this;

  this.serversArr.sort(function (a, b) {
    return a.title.toLowerCase().localeCompare(b.title.toLowerCase());
  });

  this.serversHash = {};
  this.serversArr.forEach(function (server) {
    data.push({
      admin_password: server.admin_password,
      battle_eye: server.battle_eye,
      headless: server.headless,
      max_players: server.max_players,
      mods: server.mods,
      password: server.password,
      persistent: server.persistent,
      port: server.port,
      title: server.title,
      von: server.von,
    });

    self.serversHash[server.id] = server;
  });

  fs.writeFile(filePath, JSON.stringify(data), function(err) {
    if (err) {
      throw err;
    } else {
      self.emit('servers');
    }
  });
});

module.exports = Manager;