'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); /*
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     * All objects in the event handling chain should inherit from this class
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     */

var _logger = require('./utils/logger');

var _errors = require('./errors');

var _events = require('./events');

var _events2 = _interopRequireDefault(_events);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var EventHandler = function () {
  function EventHandler(hls) {
    _classCallCheck(this, EventHandler);

    this.hls = hls;
    this.onEvent = this.onEvent.bind(this);

    for (var _len = arguments.length, events = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      events[_key - 1] = arguments[_key];
    }

    this.handledEvents = events;
    this.useGenericHandler = true;

    this.registerListeners();
  }

  _createClass(EventHandler, [{
    key: 'destroy',
    value: function destroy() {
      this.unregisterListeners();
    }
  }, {
    key: 'isEventHandler',
    value: function isEventHandler() {
      return _typeof(this.handledEvents) === 'object' && this.handledEvents.length && typeof this.onEvent === 'function';
    }
  }, {
    key: 'registerListeners',
    value: function registerListeners() {
      if (this.isEventHandler()) {
        this.handledEvents.forEach(function (event) {
          if (event === 'hlsEventGeneric') {
            throw new Error('Forbidden event name: ' + event);
          }
          this.hls.on(event, this.onEvent);
        }, this);
      }
    }
  }, {
    key: 'unregisterListeners',
    value: function unregisterListeners() {
      if (this.isEventHandler()) {
        this.handledEvents.forEach(function (event) {
          this.hls.off(event, this.onEvent);
        }, this);
      }
    }

    /**
     * arguments: event (string), data (any)
     */

  }, {
    key: 'onEvent',
    value: function onEvent(event, data) {
      this.onEventGeneric(event, data);
    }
  }, {
    key: 'onEventGeneric',
    value: function onEventGeneric(event, data) {
      var eventToFunction = function eventToFunction(event, data) {
        var funcName = 'on' + event.replace('hls', '');
        if (typeof this[funcName] !== 'function') {
          throw new Error('Event ' + event + ' has no generic handler in this ' + this.constructor.name + ' class (tried ' + funcName + ')');
        }
        return this[funcName].bind(this, data);
      };
      try {
        eventToFunction.call(this, event, data).call();
      } catch (err) {
        _logger.logger.error('internal error happened while processing ' + event + ':' + err.message);
        this.hls.trigger(_events2.default.ERROR, { type: _errors.ErrorTypes.OTHER_ERROR, details: _errors.ErrorDetails.INTERNAL_EXCEPTION, fatal: false, event: event, err: err });
      }
    }
  }]);

  return EventHandler;
}();

exports.default = EventHandler;