import { call, put, take, apply } from 'redux-saga/effects'
import { createSubscriptionChannel } from '../utils/websocket'
import { push } from 'react-router-redux'

import { normalize } from 'normalizr'
import { game as gameSchema } from '../schemas/games'

import { actions as gameActions, types } from '../redux/games'
import { actions as playerActions } from '../redux/players'

function getCurrentGameId() {
  const path = window.location.pathname
  return path.split('lobby/')[1]
}

function *watchLobbyUpdates({ socket }) {
  const currentGameId = getCurrentGameId()
  const lobbyUpdatesChannel = yield call(createSubscriptionChannel, socket, `/topic/lobby/${currentGameId}/updated`)
  try {
    while (true) {
      const lobby = yield take(lobbyUpdatesChannel)
      const normalized = normalize(lobby, gameSchema)
      yield put(gameActions.updateGames(normalized.entities.games))
      yield put(playerActions.updatePlayers(normalized.entities.players))
    }
  } finally {
    yield apply(lobbyUpdatesChannel, lobbyUpdatesChannel.close)
  }
}

function *watchGameStart({ socket }) {
  const currentGameId = getCurrentGameId()
  const gameStartedChannel = yield call(createSubscriptionChannel, socket, `/topic/lobby/${currentGameId}/started`)
  try {
    yield take(gameStartedChannel)
    yield put(gameActions.enterGame())
    yield put(push('/game'))
  } finally {
    yield apply(gameStartedChannel, gameStartedChannel.close)
  }
}

function *startGame({ socket }) {
  while (true) {
    yield take(types.REQUEST_START_GAME)
    yield apply(socket, socket.send, ['/app/lobby/startGame', {}])
  }
}

function *lobbySaga(socketConnection) {
  yield [
    call(watchLobbyUpdates, socketConnection),
    call(watchGameStart, socketConnection),
    call(startGame, socketConnection)
  ]
}

export default lobbySaga