const ReconnectingWebSocket = require('reconnecting-websocket');
import * as riot from 'riot';
import CONFIG from './config';

class Connection {
	constructor(me) {
		// BIND -----------------------------------
		this.onOpen =    this.onOpen.bind(this);
		this.onClose =   this.onClose.bind(this);
		this.onMessage = this.onMessage.bind(this);
		this.send =      this.send.bind(this);
		this.close =     this.close.bind(this);
		// ----------------------------------------

		riot.observable(this);

		this.state = 'initializing';
		this.me = me;
		this.buffer = [];

		const host = CONFIG.apiUrl.replace('http', 'ws');
		this.socket = new ReconnectingWebSocket(`${host}?i=${me.token}`);
		this.socket.addEventListener('open', this.onOpen);
		this.socket.addEventListener('close', this.onClose);
		this.socket.addEventListener('message', this.onMessage);

		this.on('i_updated', me.update);
	}

	onOpen() {
		this.state = 'connected';
		this.trigger('_connected_');

		// バッファーを処理
		const _buffer = [].concat(this.buffer); // Shallow copy
		this.buffer = []; // Clear buffer
		_buffer.forEach(message => {
			this.send(message); // Resend each buffered messages
		});
	}

	onClose() {
		this.state = 'reconnecting';
		this.trigger('_closed_');
	}

	onMessage(message) {
		try {
			const msg = JSON.parse(message.data);
			if (msg.type) this.trigger(msg.type, msg.body);
		} catch(e) {
			// noop
		}
	}

	send(message) {
		// まだ接続が確立されていなかったらバッファリングして次に接続した時に送信する
		if (this.state != 'connected') {
			this.buffer.push(message);
			return;
		};

		this.socket.send(JSON.stringify(message));
	}

	close() {
		this.socket.removeEventListener('open', this.onOpen);
		this.socket.removeEventListener('message', this.onMessage);
	}
}

export default Connection;