/**
 *
 * User: Martin Donnelly
 * Date: 2016-07-06
 * Time: 13:37
 *
 */

var cp = require('child_process');
var spawn = cp.spawn;
var fork = cp.fork;
var spawnP = require('child-process-promise').spawn;

var EventEmitter = require('events');
var busEmitter = new EventEmitter();

var util = require('util');

var logger = require('log4js').getLogger();

var bluetest = module.exports = function(options) {
  'use strict';

  var core = {
    mac: '',
    gatt: null
  };


  core.gattConnected = function() {
    logger.debug('Gatt connected!!!!!');

    core.gatt.stdin.write('primary\n');
  };

  core.connectGattP = function() {
    core.gatt = spawn('gatttool',['-I']);
    var child = core.gatt.childProcess;

    child.on('error', function(err) {
      logger.error('child',err);
    });
    child.on('exit', function(code) {

      logger.debug('child','gatt exit code', code);
    });

    child.on('message', function(m) {
      logger.info('child',m);
    });

    child.stdout.on('data', (data) => {

      logger.info('child',`stdout: ${data}`);

      if (data.indexOf('Connection successful') > -1) {

        busEmitter.emit('child','connected');
      }
    });

    child.stderr.on('data', (data) => {
      logger.info('child',`stderr: ${data}`);
    });

    child.on('close', (code) => {
      logger.warn('child',`child process exited with code ${code}`);
    });


    core.gatt.then(function () {
            console.log('[spawn] done!');
        })
        .catch(function (err) {
            console.error('[spawn] ERROR: ', err);
        });


  };

  core.connectGatt = function() {
    logger.info('trying to connect using gatttool');
    core.gatt = spawn('gatttool',['-I']);
    var cStr;
    core.gatt.on('error', function(err) {
      logger.error(err);
    });
    core.gatt.on('exit', function(code) {

      logger.debug('gatt exit code', code);
    });

    core.gatt.on('message', function(m) {
      logger.info(m);
    });

    core.gatt.stdout.on('data', (data) => {

      logger.info(`stdout: ${data}`);

      if (data.indexOf('Connection successful') > -1) {

        busEmitter.emit('connected');
      }
    });

    core.gatt.stderr.on('data', (data) => {
      logger.info(`stderr: ${data}`);
    });

    core.gatt.on('close', (code) => {
      logger.warn(`child process exited with code ${code}`);
    });



    logger.info('Trying to connect to ', core.mac);
    cStr = 'connect ' + core.mac + '\n';
    core.gatt.stdin.write(cStr);


  };

  core.init = function(options) {


    var tool_path = '';
    var hcidev = 'hvi0';

    if (typeof options.mac !== 'undefined') {
      core.mac = options.mac;
    } else {
      console.log('You need to pass a mac address.');
      process.exit(1);
    }
    logger.info('Working with:' , options);


    var hciconfig = spawn(tool_path + 'hciconfig', [hcidev, 'up']);

    hciconfig.on('exit', function(code) {

      logger.debug('code',code);


      if (code !== 0) {

        // Could not get the device UP, maybe due to permissions, should run with sudo.
        busEmitter.emit('error','hciconfig: failed to bring up device ' + hcidev + '. Try running with sudo.');
        return;

      } else {

        core.connectGattP();

      }


    });

  };

  busEmitter.on('connected', core.gattConnected);
  core.init(options);
};
util.inherits(bluetest, EventEmitter);