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;