'use strict';

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

function Bus(params) {
  events.EventEmitter.call(this);
  this.db = params.db;
}

util.inherits(Bus, events.EventEmitter);

Bus.prototype.subscribe = function(name) {
  for (var i = 0; i < this.db.modules.length; i++) {
    var mod = this.db.modules[i];
    var events = mod.getPublishEvents();
    for (var j = 0; j < events.length; j++) {
      var event = events[j];
      var params = Array.prototype.slice.call(arguments).slice(1);
      params.unshift(this);
      if (name === event.name) {
        event.subscribe.apply(event.scope, params);
      }
    }
  }
};

Bus.prototype.unsubscribe = function(name) {
  for (var i = 0; i < this.db.modules.length; i++) {
    var mod = this.db.modules[i];
    var events = mod.getPublishEvents();
    for (var j = 0; j < events.length; j++) {
      var event = events[j];
      var params = Array.prototype.slice.call(arguments).slice(1);
      params.unshift(this);
      if (name === event.name) {
        event.unsubscribe.apply(event.scope, params);
      }
    }
  }
};

Bus.prototype.close = function() {
  // Unsubscribe from all events
  for (var i = 0; i < this.db.modules.length; i++) {
    var mod = this.db.modules[i];
    var events = mod.getPublishEvents();
    for (var j = 0; j < events.length; j++) {
      var event = events[j];
      event.unsubscribe.call(event.scope, this);
    }
  }
};

module.exports = Bus;