import D from 'debug';
import io from 'socket.io-client';

import {compose, EventEmitter} from '@avocado/core';

import {SocketIoParser, allPackets, idFromPacket} from '../packet';

const debug = D('@avocado/net:socket');

const decorate = compose(
  EventEmitter,
);

export class SocketClient extends decorate(class {}) {

  constructor(address, options = {}) {
    super();
    this.address = address;
    this.isConnected = false;
    this.isReconnecting = false;
    this.options = {
      parser: SocketIoParser,
      path: '/avocado',
      perMessageDeflate: false,
      reconnection: false,
      ...options
    };
    this.socket = null;
    this.connect();
  }

  connect() {
    if (this.socket) {
      this.socket.destroy();
    }
    this.socket = io(this.address, {
      ...this.options,
    });
    this.socket.on('connect', () => {
      debug('connect');
      this.isConnected = true;
      this.emit('connect');
    });
    this.socket.on('connect_error', () => {
      debug('connect_error');
      this.tryReconnect();
    });
    this.socket.on('connect_timeout', () => {
      debug('connect_timeout');
      this.tryReconnect();
    });
    this.socket.on('disconnect', () => {
      this.isConnected = false;
      this.emit('disconnect');
      debug('disconnect');
      this.tryReconnect();
    });
    for (const Packet of allPackets()) {
      const id = idFromPacket(Packet);
      this.socket.on(id, (data) => {
        const packet = new Packet(data);
        debug('recieved packet %o', packet);
        this.emit('packet', packet);
      });
    }
  }

  disconnect() {
    this.socket.disconnect();
  }

  get id() {
    return this.socket ? this.socket.id : undefined;
  }

  send(packet) {
    debug('sending packet %o', packet);
    const id = idFromPacket(packet.constructor);
    this.socket.binary(true).emit(id, packet.data);
  }

  get session() {
    return this.socket.handshake.session;
  }

  to(channel) {
    return {
      send: (packet) => {
        const id = idFromPacket(packet.constructor);
        this.socket.binary(true).to(channel).emit(id, packet.data);
      },
    };
  }

  tryReconnect() {
    if (this.isReconnecting) {
      return;
    }
    this.isReconnecting = true;
    let backoff = 100;
    const tryToReconnect = () => {
      debug('try to reconnect');
      if (this.isConnected) {
        debug('is connected');
        this.isReconnecting = false;
        return;
      }
      this.connect();
      backoff = Math.min(2000, backoff * 1.5);
      debug('backoff', backoff);
      setTimeout(tryToReconnect, backoff);
    }
    setTimeout(tryToReconnect, 0);
  }

}