'use strict';

const config = require('config');
const bhttp = require('bhttp');
const WebSocket = require('ws');

async function auth() {
    const httpSession = bhttp.session();

    const res = await httpSession.post(`${config.api}/session`, config.user, {
	encodeJSON: true,
    });

    if (res.statusCode !== 200) {
	throw new Error(`Failed to authenticate: ${res.body.toString()}`);
    }

    return {
	user: res.body,
	httpSession,
	sessionCookie: res.headers['set-cookie'][0],
    };
}

async function getWsId(httpSession) {
    const res = await httpSession.get(`${config.api}/socket`);

    if (res.statusCode !== 200) {
	throw new Error(`Failed to retrieve WebSocket ID: ${res.body.toString()}`);
    }

    return res.body;
}

function connect(wsCreds, sessionCookie) {
    const ws = new WebSocket(`${config.socket}?${new URLSearchParams({ v: wsCreds.wsId, t: wsCreds.timestamp }).toString()}`, [], {
	headers: {
	    cookie: sessionCookie,
	},
    });

    return ws;
}

function onConnect(data, ws) {
    ws.transmit('joinRooms', { rooms: config.channels });
}

function onRooms({ rooms }, ws) {
    rooms.forEach((room) => {
	ws.transmit('message', {
	    roomId: room.id,
	    body: `Hi, I am ${config.user.username}, your game host!`
	});
    });
}

const handlers = {
    connect: onConnect,
    rooms: onRooms,
};

async function init() {
    const { user, httpSession, sessionCookie } = await auth();
    const wsCreds = await getWsId(httpSession);
    const ws = connect(wsCreds, sessionCookie);

    ws.transmit = (domain, data) => {
	ws.send(JSON.stringify([domain, data]));
    }

    ws.on('message', (msg) => {
	const [domain, data] = JSON.parse(msg);

	handlers[domain]?.(data, ws);
    });
}

init();