const express = require('express');
const bodyParser = require('body-parser');
const jwt = require('jsonwebtoken');
const cors = require('cors');

const { Document, Schema, connect } = require('camo');

// Define the Racers schema
class Racer extends Document {
  constructor() {
    super();

    this.name = String;
    this.gameHandle = String;
  }
}

// Define the Seasons schema
class Season extends Document {
  constructor() {
    super();

    this.title = String;
    this.subTitle = String;
    this.startDate = String;
  }
}

class SeasonRacer extends Document{
  constructor() {
    super();

    this.racer = Racer;
    this.seasion = Season;
  }
}

// Define the Races schema
class Race extends Document {
  constructor() {
    super();

    this.weekNumber = Number;
    this.startDate = Date;
    this.endDate = Date;
    this.mapName = String;
    this.mapThumbnailUrl = String;
    this.mapUID = String;
    this.season = Season;
  }
}

// Define the RaceResults schema
class RaceResult extends Document {
  constructor() {
    super();

    this.race = Race;
    this.racer = Racer;
    this.timeInMilliseconds = Number;
    this.replayPath = String;
  }
}

connect('nedb://./nedb-database');

const fs = require('fs');
const app = express();
const upload = require('./backend/routes/upload-replay');
const TMIO = require('trackmania.io'),
    client = new TMIO.Client();

const AdvancableBuffer = require('./backend/utilities/AdvancableBuffer.js');
const gbxHeader = require('./backend/trackmania-replays/gbx-header.js');
const gbxReplay = require('./backend/trackmania-replays/gbx-replay');
  
// handling CORS 
app.use(cors());
app.use(bodyParser.json());

//const RSA_PRIVATE_KEY = fs.readFileSync('./private.key');
const RSA_PRIVATE_KEY = "Secret_KeY";
const RSA_PUBLIC_KEY = fs.readFileSync('./public.key');

const users = [
  { id: 1, username: 'user1', password: 'password1' },
  { id: 2, username: 'user2', password: 'password2' }
];

function verifyToken(req, res, next) {
  const token = req.headers['authorization'];
  console.log(token);

  if (!token || !token.startsWith('Bearer ')) {
    return res.status(401).json({ message: 'Unauthorized' });
  }

  const tokenWithoutBearer = token.slice(7); // Remove 'Bearer ' prefix
  jwt.verify(tokenWithoutBearer, RSA_PRIVATE_KEY, (err, decoded) => {
    if (err) {
      console.error(err);
      return res.status(401).json({ message: 'Invalid token' });
    }
    req.user = decoded.user;
    next();
  });
}

app.post('/api/login', (req, res) => {
  const { username, password } = req.body;

  // Check if the user exists and the password is correct
  const user = users.find(u => u.username === username && u.password === password);

  if (!user) {
    return res.status(401).json({ message: 'Invalid username or password' });
  }

  // Generate and return a JWT token
  const token = jwt.sign({ userId: user.id }, RSA_PRIVATE_KEY, { expiresIn: '1h', algorithm: 'HS256' });
  console.log(token);
  res.json({ token });
});

app.get('/api/seasons', async (req, res) => {
  const seasons = await Season.find();
  res.json({seasons: seasons});
});

function remapRaceInfo(raceRecord) {
  modableRaceObject = {
    weekNumber: raceRecord.weekNumber,
    startDate: raceRecord.startDate,
    endDate: raceRecord.endDate,
    mapName: raceRecord.mapName,
    mapThumbnailUrl: raceRecord.mapThumbnailUrl,
    mapUID: raceRecord.mapUID,
    season: raceRecord.season,
    entries: []
  }
  return modableRaceObject;
}

app.get('/api/seasons/:id', async (req, res) => {
  const { id } = req.params;
  try {
    let races = []
    let racersInSeason = [];
    const seasonDetails = await Season.findOne({_id: id});
    const seasonRaceDetails = await Race.find({season: id});
    for (let i = 0; i < seasonRaceDetails.length; i++) {
      let seasonRace = seasonRaceDetails[i];
      let modableRace = remapRaceInfo(seasonRace);

      const fastestTimesMap = new Map();
      const raceResults = await RaceResult.find({race: seasonRace._id});

      raceResults.forEach(result => {
        const racerId = result.racer._id;
        const timeInMilliseconds = result.timeInMilliseconds;
  
        if (!fastestTimesMap.has(racerId) || timeInMilliseconds < fastestTimesMap.get(racerId)) {
          fastestTimesMap.set(racerId, {"racer":result.racer, "timeInMilliseconds":timeInMilliseconds});
        }
      });

      fastestTimesMap.forEach((values, key) =>{
        modableRace.entries.push({"racer":values.racer, "timeInMilliseconds":values.timeInMilliseconds, "position":0})
      })
      
      //modableRace.entries = Array.from(fastestTimesMap.entries()).map(([racerId, timeInMilliseconds]) => ({
      //  racerId,
      //  timeInMilliseconds
      //}));

      // This is wrong it will get only the racers the in last race it processes.
      racersInSeason = Array.from(new Set(raceResults.map(result => result.racer)));

      races.push(modableRace);
    }

    let i = 1;
    let standings = []
    racersInSeason.forEach((racer) => {
      let entry = {}
      entry._id = i;
      entry.position = i;
      entry.points = 100-i;
      entry.user = racer;
      standings.push(entry);
    });
    
    res.json({season: seasonDetails, races: races, standings: standings});
  }
  catch( error ) {
    console.error(error)
    res.status(500).send('Internal Server Error');
  }
});

app.post('/api/seasons/add', verifyToken, async (req, res) => {
  const { title, subTitle, startDate } = req.body;
  const season = await Season.create({ title, subTitle, startDate }).save();
  console.log(season);
  res.json(season);
});

app.post('/api/race/add', verifyToken, async (req, res) => {
  const { seasonId, startDate, endDate, mapUID, weekNumber } = req.body;

  try{
    client.maps.get(mapUID).then(async mapInfo => {
      console.log(mapInfo.name);
      const season = await Season.findOne({_id: seasonId});
      const mapName = mapInfo.name;
      const mapThumbnailUrl = mapInfo.thumbnail;
      const race = await Race.create({ weekNumber, startDate, endDate, mapName, mapUID, mapThumbnailUrl, season })
      console.log(race);
      race.save();
      res.json(race);
    });
  }
  catch (error) {
    console.error(error)
    res.status(500).send('Internal Server Error');
  }
  
});

app.post('/api/racer/add', verifyToken, async (req, res) => {
  const { name, gamerHandle, seasonId } = req.body;
  const season = await Season.findOne({_id: seasonId});
  let existingRacer = await Racer.findOne({ gameHandle: gamerHandle });
  if (existingRacer == undefined) {
    existingRacer = await Racer.create({ name, gamerHandle });
    existingRacer.save();
  }
});

// route for handling requests from the Angular client 
app.post('/api/upload-replay', upload.single('file'), async (req, res) => {
  let file = req.file;
  const { seasonId } = req.body;
  console.log("File uploaded: ", req.file);
  
  await fs.readFile(file.path, async function(err, buffer)
  {
    buff = new AdvancableBuffer(buffer);
    header = new gbxHeader();
    header.parse(buff);
    if (header.is_vaild == false)
    {
      return;
    }
    console.log(header);
    replay = new gbxReplay();
    replay.parse(buff);
    let currentRacer = await Racer.findOne({gameHandle: replay.gamerHandle});
    console.log(currentRacer);
    if (currentRacer == undefined)
    {
      currentRacer = await Racer.create({name: "DanH", gameHandle: replay.gamerHandle});
      currentRacer.save();
    }

    let race = await Race.findOne({season: seasonId, mapUID: replay.mapUID})

    result = await RaceResult.create({race: race, racer: currentRacer, timeInMilliseconds: replay.bestTime, replayPath: file.destination});
    result.save();

    res.status(200);
  });
});
  
app.listen(3000, () => { 
    console.log('Server listening on port 3000'); 
});