'use strict';

const jwt = require('jsonwebtoken');
const CryptoJS = require('crypto-js');

const { v4: uuidV4 } = require('uuid');

const config = require('./config');
const JWT_KEY = config.jwt.key;
const JWT_EXP = config.jwt.exp;
module.exports = class ServerApi {
    constructor(host = null, authorization = null, api_key_secret = null) {
        this._host = host;
        this._authorization = authorization;
        this._api_key_secret = api_key_secret;
    }

    isAuthorized() {
        if (this._authorization != this._api_key_secret) return false;
        return true;
    }

    getStats(peers, timestamp = new Date().toISOString()) {
        const metaKeys = new Set(['lock', 'password']);
        let totalRooms = 0;
        let totalPeers = 0;

        for (const room_id in peers) {
            totalRooms++; // Increment room count
            totalPeers += Object.keys(peers[room_id]).filter((k) => !metaKeys.has(k)).length;
        }

        return {
            timestamp,
            totalRooms,
            totalPeers,
        };
    }

    getActiveRooms(roomList) {
        const metaKeys = new Set(['lock', 'password']);
        return Object.entries(roomList).map(([roomId, room]) => ({
            id: roomId,
            peers: room && typeof room === 'object' ? Object.keys(room).filter((k) => !metaKeys.has(k)).length : 0,
            join: this.getProtocol() + this._host + '/' + roomId,
        }));
    }

    getMeetings(peers) {
        const meetings = {};
        for (const room_id in peers) {
            const meeting = peers[room_id];
            meetings[room_id] = meeting;
        }
        return meetings;
    }

    getMeetingURL() {
        return this.getProtocol() + this._host + '/join/' + uuidV4();
    }

    getJoinURL(data) {
        // Get data
        const { room, name, avatar, audio, video, screen, chat, notify, hide, duration, token } = data;

        const roomValue = room || uuidV4();
        const nameValue = name || 'User-' + this.getRandomNumber();
        const avatarValue = avatar || false;
        const audioValue = audio || false;
        const videoValue = video || false;
        const screenValue = screen || false;
        const chatValue = chat || false;
        const hideValue = hide || false;
        const notifyValue = notify || false;
        const durationValue = duration || 'unlimited';
        const jwtToken = token ? '&token=' + this.getToken(token) : '';

        const joinURL =
            this.getProtocol() +
            this._host +
            '/join?' +
            `room=${roomValue}` +
            `&name=${encodeURIComponent(nameValue)}` +
            `&avatar=${encodeURIComponent(avatarValue)}` +
            `&audio=${audioValue}` +
            `&video=${videoValue}` +
            `&screen=${screenValue}` +
            `&chat=${chatValue}` +
            `&hide=${hideValue}` +
            `&notify=${notifyValue}` +
            `&duration=${durationValue}` +
            jwtToken;

        return joinURL;
    }

    getToken(token) {
        if (!token) return '';

        const { username = 'username', password = 'password', presenter = false, expire } = token;

        const expireValue = expire || JWT_EXP;

        // Constructing payload
        const payload = {
            username: String(username),
            password: String(password),
            presenter: String(presenter),
        };

        // Encrypt payload using AES encryption
        const payloadString = JSON.stringify(payload);
        const encryptedPayload = CryptoJS.AES.encrypt(payloadString, JWT_KEY).toString();

        // Constructing JWT token
        const jwtToken = jwt.sign({ data: encryptedPayload }, JWT_KEY, { expiresIn: expireValue });

        return jwtToken;
    }

    getProtocol() {
        return 'http' + (this._host.includes('localhost') ? '' : 's') + '://';
    }

    getRandomNumber() {
        return Math.floor(Math.random() * 999999);
    }
};