import express, { Request, Response } from 'express';
import ReadSettings from './settings';
import { GetRandomPort, OpenGameInstance } from './helpers';
import { Settings, Player, Room, QueueEntry } from './types';

const version = "v1.0";
console.log("Starting Cupid Matchmaker for unity " + version);

const app = express();
const queueGraceTime = 2000;

// Read settings
const settings = ReadSettings();
if (settings == null) { 
    console.error("Failed to read settings");
    process.exit(1);
}

// Type assertion since we've already checked for null
const typedSettings = settings as Settings;
const logLevel = typedSettings.log_level;

LogVerbose(typedSettings);

let Rooms: Room[] = [];
let Queue: QueueEntry[] = [];

app.get('/settings', (req: Request, res: Response) => {
    if (req.query.password !== typedSettings.password) {
        res.send("403 Unauthorized");
        return;
    }
    const m_settings = {
        minimum_players: typedSettings.minimum_players,
        maximum_players: typedSettings.maximum_players,
        waiting_time: typedSettings.waiting_time,
        port_range_min: typedSettings.port_range_min,
        port_range_max: typedSettings.port_range_max,
        games: typedSettings.games
    };
    console.log(m_settings);
    res.send(m_settings);
});

app.get('/', (req: Request, res: Response) => {
    const username = req.query.username?.toString() ?? "";
    const game_name = req.query.game_name?.toString() ?? "";


    if (!ValidateRequest(req, res)) {
        return;
    }

    // Check query
    let joinedRoom: Room | null = null;
    let alreadyOnQueue = false;
    
    Queue.forEach(element => {
        if (element.Name === username) {
            element.LastSeen = Date.now();
            alreadyOnQueue = true;
        } else {
            if (Date.now() - element.LastSeen > queueGraceTime) {
                const index = Queue.indexOf(element);
                if (index > -1) {
                    Queue.splice(index, 1);
                }
                Log(`Player ${element.Name} is afk, removing.`);
            }
        }
    });

    // Check on rooms if not in the queue, Maybe they already joined a room
    let possibleRoom: Room | null = null;

    Rooms.forEach(element => {
        let roomValid = true;
        if (Date.now() - element.InitTime > typedSettings.waiting_time) {
            // This room is expired
            LogDebug("This room is expired, Removing now");
            LogDebug(element);
            const index = Rooms.indexOf(element);
            if (index > -1) {
                Rooms.splice(index, 1);
            }
            roomValid = false;
        }
        if (roomValid) {
            element.Players.forEach(player => {
                if (player.Name === username) {// Already in a room
                    joinedRoom = element;
                }
            });
            if (element.Players.length === 0) {
                // This room is empty, remove it

                const index = Rooms.indexOf(element);
                if (index > -1) {
                    Rooms.splice(index, 1);
                }
            } else if (element.Players.length < typedSettings.maximum_players && element.GameName === game_name) {
                possibleRoom = element;
            }
        }
    });

    if (joinedRoom !== null) { // Already in a room. Stopping here
        res.send(joinedRoom);
        return;
    }

    // Neither in a room nor in queue, Let's see
    if (possibleRoom === null) {
        if (Queue.length >= typedSettings.minimum_players) {
            const newPort = GetRandomPort(typedSettings.port_range_min, typedSettings.port_range_max);
            const newRoom: Room = {
                Players: [{ Name: username, LastSeen: Date.now() }],
                GameName: game_name,
                Port: newPort,
                InitTime: Date.now()
            };
            Rooms.push(newRoom);
            //TODO: Get the correct game exe from the game id
            OpenGameInstance(typedSettings.games[0].exe, newPort);
            res.send(newRoom);
            return;
        }
    } else {
        // We know possibleRoom is a Room type here since we checked it's not null
        const room: Room = possibleRoom;
        room.Players.push({ Name: username, LastSeen: Date.now() });
        res.send(room);
        return;
    }

    // Not even got a new room. Back to queue
    if (!alreadyOnQueue) {
        const newQueueEntry: QueueEntry = { Name: username, LastSeen: Date.now() };
        LogVerbose(newQueueEntry);
        Queue.push(newQueueEntry);
    }
    LogVerbose("Rooms");
    Rooms.forEach(element => {
        LogVerbose(element);
    });
    LogVerbose("Queue");
    LogVerbose(Queue);
    res.send("0");
});

app.get('/cancel', (req: Request, res: Response) => {
    const username = req.query.username?.toString() ?? "";

    if (!ValidateRequest(req, res)) {
        return;
    }
    let foundUser = false;
    Queue.forEach((element) => {
        if (element.Name === username) {
            const index = Queue.indexOf(element);
            if (index > -1) {
                Queue.splice(index, 1);
            }
            res.send("1");
            foundUser = true;
            return;
        }
    });
    if (!foundUser) {
        res.send("Couldn't find user " + username + " in the queue");
    }
});

function ValidateRequest(req: Request, res: Response): boolean {
    const username = req.query.username?.toString() ?? "";
    const password = req.query.password?.toString() ?? "";
    if (password !== typedSettings.password) {
        res.send("403 Unauthorized");
        LogVerbose("Unauthorized call " + password + ":" + typedSettings.password);
        return false;
    }
    if (username.length < 2) {
        res.send("Bad credentials");
        return false;
    }
    return true;
}

function Log(msg: any): void {
    console.log(msg);
}

function LogDebug(msg: any): void {
    if (logLevel > 0) {
        console.log(msg);
    }
}

function LogVerbose(msg: any): void {
    if (logLevel > 1) {
        console.log(msg);
    }
}

app.listen(typedSettings.port);
console.log("Listening on port " + typedSettings.port);