'use strict'
const EventEmitter = require('events')
const createObjectURL = require('../browser/createObjectURL')
const debug = require('debug')('peer-calls:streamStore')
const dispatcher = require('../dispatcher/dispatcher.js')

const emitter = new EventEmitter()
const addListener = cb => emitter.on('change', cb)
const removeListener = cb => emitter.removeListener('change', cb)

const streams = {}

const handlers = {
  'add-stream': ({ userId, stream }) => {
    debug('add-stream, user: %s', userId)
    streams[userId] = {
      stream,
      url: createObjectURL(stream)
    }
  },
  'remove-stream': ({ userId }) => {
    debug('remove-stream, user: %s', userId)
    delete streams[userId]
  }
}

const dispatcherIndex = dispatcher.register(action => {
  let handle = handlers[action.type]
  if (!handle) return
  handle(action)
  emitter.emit('change')
})

function getStream (userId) {
  return streams[userId]
}

function getStreams () {
  return streams
}

module.exports = {
  dispatcherIndex,
  addListener,
  removeListener,
  getStream,
  getStreams
}