import io from 'socket.io-client';

import 'register-packets';
import {SocketIoParser} from '../packet';

let socket = null;

function onMessageConnect({address, options}) {
  socket = io(address, {
    parser: SocketIoParser,
    ...options,
  });
  const onSocketConnect = () => {
    postMessage({
      type: 'emit',
      payload: ['connect'],
    });
  }
  const onSocketConnectError = (error) => {
    postMessage({
      type: 'emit',
      payload: ['connect_error', error.toString()],
    });
  }
  const onSocketConnectTimeout = (timeout) => {
    postMessage({
      type: 'emit',
      payload: ['connect_timeout', timeout],
    });
  }
  const onSocketDisconnect = (reason) => {
    postMessage({
      type: 'emit',
      payload: ['disconnect', reason],
    });
  }
  const onSocketError = (error) => {
    postMessage({
      type: 'emit',
      payload: ['error', error.toString()],
    });
  }
  const onSocketReconnect = (attempt) => {
    postMessage({
      type: 'emit',
      payload: ['reconnect', attempt],
    });
  }
  const onSocketReconnectAttempt = (attempt) => {
    postMessage({
      type: 'emit',
      payload: ['reconnect_attempt', attempt],
    });
  }
  const onSocketReconnecting = (attempt) => {
    postMessage({
      type: 'emit',
      payload: ['reconnecting', attempt],
    });
  }
  const onSocketReconnectError = (error) => {
    postMessage({
      type: 'emit',
      payload: ['reconnect_error', error.toString()],
    });
  }
  const onSocketReconnectFailed = () => {
    postMessage({
      type: 'emit',
      payload: ['reconnect_failed'],
    });
  }
  const onSocketPing = () => {
    postMessage({
      type: 'emit',
      payload: ['ping'],
    });
  }
  const onSocketPong = (latency) => {
    postMessage({
      type: 'emit',
      payload: ['pong', latency],
    });
  }
  socket.on('connect', onSocketConnect);
  socket.on('connect_error', onSocketConnectError);
  socket.on('connect_timeout', onSocketConnectTimeout);
  socket.on('disconnect', onSocketDisconnect);
  socket.on('error', onSocketError);
  socket.on('reconnect', onSocketReconnect);
  socket.on('reconnect_attempt', onSocketReconnectAttempt);
  socket.on('reconnecting', onSocketReconnecting);
  socket.on('reconnect_error', onSocketReconnectError);
  socket.on('reconnect_failed', onSocketReconnectFailed);
  socket.on('ping', onSocketPing);
  socket.on('pong', onSocketPong);
}

function onMessageClose() {
  if (!socket) {
    return;
  }
  socket.close();
  socket = undefined;
}

function onMessageEmit(args) {
  if (!socket) {
    return;
  }
  socket.emit(...args);
}

function onMessageOn(type) {
  if (!socket) {
    return;
  }
  if (socket.listeners(type).length !== 0) {
    return;
  }
  socket.on(type, function(...args) {
    postMessage({
      type: 'emit',
      payload: [type].concat(args),
    });
  });
}

self.onmessage = function({data: action}) {
  switch(action.type) {
    case 'connect':
      return onMessageConnect(action.payload);
    case 'emit':
      return onMessageEmit(action.payload);
    case 'on':
      return onMessageOn(action.payload);
    case 'close':
      return onMessageClose();
  }
}