var fs     = require('fs');
var ipm2   = require('pm2-interface');
var rpc    = require('pm2-axon-rpc');
var axon   = require('pm2-axon');
var debug  = require('debug')('interface:driver'); // Interface
var chalk  = require('chalk');

var pkg    = require('../../package.json');

var cst               = require('../../constants.js');
var Cipher            = require('./Cipher.js');
var Filter            = require('./Filter.js');
var ReverseInteractor = require('./ReverseInteractor.js');
var PushInteractor    = require('./PushInteractor.js');
var WatchDog          = require('./WatchDog.js');

var Url = require('url');
var os = require('os');

var HttpRequest       = require('./HttpRequest.js');

var Daemon = {
  connectToPM2 : function() {
    return ipm2({bind_host: 'localhost'});
  },
  exit : function() {
    setTimeout(function() {
      if (!this._rpc || !this._rpc.sock)
        return process.exit(cst.ERROR_EXIT);

      this._rpc.sock.close(function() {
        process.exit(cst.SUCCESS_EXIT);
      });
    }, 100);
  },
  activateRPC : function() {
    console.log('Launching Interactor exposure');

    var self          = this;
    var rep           = axon.socket('rep');
    var daemon_server = new rpc.Server(rep);
    var sock          = rep.bind(cst.INTERACTOR_RPC_PORT);

    daemon_server.expose({
      kill : function(cb) {
        console.log('Killing interactor');
        cb(null);

        Daemon.exit();
      },
      getInfos : function(cb) {
        return cb(null, {
          machine_name : self.opts.MACHINE_NAME,
          public_key   : self.opts.PUBLIC_KEY,
          secret_key   : self.opts.SECRET_KEY,
          remote_host  : cst.REMOTE_HOST,
          remote_port  : cst.REMOTE_PORT,
          reverse_interaction : self.opts.REVERSE_INTERACT
        });
      }
    });
    return daemon_server;
  },
  formatMetada : function() {
    var cpu, memory;

    var self = this;

    try {
      cpu    = os.cpus();
      memory = Math.floor(os.totalmem() / 1024 / 1024);
    } catch(e) {
      cpu    = 0;
      memory = 0;
    };

    var ciphered_data = Cipher.cipherMessage(JSON.stringify({
      MACHINE_NAME : this.opts.MACHINE_NAME,
      PUBLIC_KEY   : this.opts.PUBLIC_KEY,
      PM2_VERSION  : this.opts.PM2_VERSION,
      MEMORY       : memory,
      HOSTNAME     : os.hostname(),
      CPUS         : cpu.length
    }), this.opts.SECRET_KEY);

    return ciphered_data;
  },
  refreshWorker : function() {
    var self = this;

    function refreshMetadata() {
      var ciphered_data = Daemon.formatMetada();

      HttpRequest.post({
        url  : self.opts.ROOT_URL,
        port : self.opts.ROOT_PORT,
        data : {
          public_id : self.opts.PUBLIC_KEY,
          data      : ciphered_data
        }
      }, function(err, km_data) {
        if (err) return console.error(err);
        if (km_data.disabled == true) {
          console.error(chalk.cyan('[Keymetrics.io]') + ' Server DISABLED BY ADMINISTRATION contact support contact@keymetrics.io with reference to your public and secret keys)');
          return Daemon.exit();
        }

        /**************************************
         *  Urls has changed = update workers *
         **************************************/

        if ((Daemon.current_km_data.endpoints.push != km_data.endpoints.push) ||
            (Daemon.current_km_data.endpoints.reverse != km_data.endpoints.reverse)) {
          console.log('[Interactor] Urls changed');
          PushInteractor.changeUrl(km_data.endpoints.push);
          ReverseInteractor.changeUrl(km_data.endpoints.reverse);
          Daemon.current_km_data = km_data;
        }
        return false;
      });

    };

    // Refresh metadata every 10 minutes
    setInterval(function() {
      refreshMetadata();
    }, 60000 * 10);
  },
  validateData : function() {
    var opts = {};

    opts.MACHINE_NAME     = process.env.PM2_MACHINE_NAME;
    opts.PUBLIC_KEY       = process.env.PM2_PUBLIC_KEY;
    opts.SECRET_KEY       = process.env.PM2_SECRET_KEY;
    opts.REVERSE_INTERACT = JSON.parse(process.env.PM2_REVERSE_INTERACT);
    opts.PM2_VERSION      = pkg.version;

    if (!opts.MACHINE_NAME) {
      console.error('You must provide a PM2_MACHINE_NAME environment variable');
      process.exit(cst.ERROR_EXIT);
    }
    else if (!opts.PUBLIC_KEY) {
      console.error('You must provide a PM2_PUBLIC_KEY environment variable');
      process.exit(cst.ERROR_EXIT);
    }
    else if (!opts.SECRET_KEY) {
      console.error('You must provide a PM2_SECRET_KEY environment variable');
      process.exit(cst.ERROR_EXIT);
    }
    return opts;
  },
  welcome : function(cb) {
    var self = this;
    var ciphered_data = Daemon.formatMetada();

    if (!ciphered_data) {
      process.send({
        msg : 'Error while ciphering data',
        error : true
      });
      return process.exit(1);
    }

    HttpRequest.post({
      url  : self.opts.ROOT_URL,
      port : self.opts.ROOT_PORT,
      data : {
        public_id : this.opts.PUBLIC_KEY,
        data      : ciphered_data
      }
    }, function(err, km_data) {
      self.current_km_data = km_data;

      if (err) {
        return cb(err);
      }

      // For Human feedback
      if (process.send)
        process.send({
          error               : false,
          km_data             : km_data,
          online              : true,
          pid                 : process.pid,
          machine_name        : self.opts.MACHINE_NAME,
          public_key          : self.opts.PUBLIC_KEY,
          secret_key          : self.opts.SECRET_KEY,
          reverse_interaction : self.opts.REVERSE_INTERACT
        });

      // Return get data
      return cb(null, km_data);
    });
  },
  start : function() {
    var self = this;

    self.opts = self.validateData();
    self.opts.ipm2 = null;
    self.current_km_data = null;

    self._rpc = self.activateRPC();

    // WatchDog.start({
    //   conf : self.opts
    // });

    if (cst.DEBUG) {
      self.opts.ROOT_URL  = '127.0.0.1';
      if (process.env.NODE_ENV == 'test')
        self.opts.ROOT_PORT = 3400;
      else
        self.opts.ROOT_PORT = 3000;
    }
    else {
      self.opts.ROOT_URL = cst.KEYMETRICS_ROOT_URL;
      self.opts.ROOT_PORT = 443;
    }

    Daemon.welcome(function(err, km_data) {
      if (err) {
        process.send({
          error : true,
          msg : err.stack || err
        });
        return Daemon.exit();
      }

      if (km_data.disabled == true) {
        console.error('Interactor disabled');
        return Daemon.exit();
      }
      if (km_data.pending == true) {
        console.error('Interactor pending');
        return Daemon.exit();
      }

      if (km_data.active == true) {

        self.opts.ipm2 = self.connectToPM2();

        PushInteractor.start({
          url  : km_data.endpoints.push,
          conf : self.opts
        });

        if (self.opts.REVERSE_INTERACT == true) {
          ReverseInteractor.start({
            url : km_data.endpoints.reverse,
            conf : self.opts
          });
        }
        Daemon.refreshWorker();
      }
    });


  }
};

/**
 * MAIN
 */
if (require.main === module) {
  console.log(chalk.cyan.bold('[Keymetrics.io]') + ' Launching agent');
  process.title = 'PM2: Keymetrics.io Agent';

  Daemon.start();
}