var cst         = require('../../../constants.js');
var Common      = require('../../Common.js');
var chalk       = require('chalk');
var fs          = require('fs');
var KMDaemon    = require('@pm2/agent/src/InteractorClient');
var pkg         = require('../../../package.json')

module.exports = function(CLI) {

  CLI.prototype.linkManagement = function(cmd, public_key, machine, opts, cb) {
    var that = this;

    // pm2 link stop || kill
    if (cmd == 'stop' || cmd == 'kill') {
      that.gl_is_km_linked = false
      console.log(cst.PM2_IO_MSG + ' Stopping agent...');

      return that.killAgent(function(err) {
        if (err) {
          Common.printError(err);
          return process.exit(cst.ERROR_EXIT);
        }
        console.log(cst.PM2_IO_MSG + ' Stopped');

        that.reload('all', () => {
          return process.exit(cst.SUCCESS_EXIT);
        })
      });
    }

    // pm2 link info
    if (cmd == 'info') {
      console.log(cst.PM2_IO_MSG + ' Getting agent information...');
      that.agentInfos(function(err, infos) {
        if (err) {
          console.error(cst.PM2_IO_MSG_ERR + ' ' + err.message);
          return that.exitCli(cst.ERROR_EXIT);
        }
        console.log(infos);
        return that.exitCli(cst.SUCCESS_EXIT);
      });
      return false;
    }

    // pm2 link delete
    if (cmd == 'delete') {
      that.gl_is_km_linked = false
      console.log(cst.PM2_IO_MSG + ' Permanently disable agent...');
      that.killAgent(function(err) {
        try {
          fs.unlinkSync(cst.INTERACTION_CONF);
        } catch(e) {
          console.log(cst.PM2_IO_MSG + ' No interaction config file found');
          return process.exit(cst.SUCCESS_EXIT);
        }
        console.log(cst.PM2_IO_MSG + ' Agent interaction ended');
        if (!cb)
          return process.exit(cst.SUCCESS_EXIT);
        return cb()
      });
      return false;
    }

    if (cmd && !public_key) {
      console.error(cst.PM2_IO_MSG + ' Command [%s] unknown or missing public key', cmd);
      return process.exit(cst.ERROR_EXIT);
    }

    // pm2 link xxx yyy
    var infos;

    if (!cmd) {
      infos = null;
    }
    else
      infos = {
        public_key : public_key,
        secret_key : cmd,
        machine_name : machine,
        info_node : opts.infoNode || null,
        pm2_version: pkg.version
      }

    that.link(infos, cb)
  };

  CLI.prototype.link = function(infos, cb) {
    var that = this;

    process.env.WS_JSON_PATCH = true

    KMDaemon.launchAndInteract(cst, infos, function(err, dt) {
      if (err) {
        Common.printError(cst.PM2_IO_MSG + ' Run `$ pm2 plus` to connect')
        return that.exitCli(cst.ERROR_EXIT);
      }
      console.log(chalk.bold.green('[+] PM2+ activated!'))
      if (!cb) {
        return that.exitCli(cst.SUCCESS_EXIT);
      }
      return cb(null, dt)
    });
  };

  CLI.prototype.agentInfos = function(cb) {
    KMDaemon.getInteractInfo(this._conf, function(err, data) {
      if (err)
        return cb(Common.retErr(err));
      return cb(null, data);
    });
  };

  CLI.prototype.killAgent = function(cb) {
    var that = this;
    KMDaemon.killInteractorDaemon(that._conf, function(err) {
      if (err)
        return cb ? cb(Common.retErr(err)) : that.exitCli(cst.SUCCESS_EXIT);
      return cb ? cb(null) : that.exitCli(cst.SUCCESS_EXIT);
    });
  };

  CLI.prototype.unlink = function(cb) {
    this.linkManagement('delete', cb);
  };
};