import e from "express";
import cors from "cors";
import bodyParser from "body-parser";
import bcrypt from "bcrypt";
import Database from "better-sqlite3";

const app = e();
const port = 3000;
const db = new Database("./database.db");

app.use(cors());
app.use(e.json());
app.use(bodyParser.json());

Date.prototype.addHours= function(h){
    this.setTime(this.getTime() + (h*60*60*1000));
    return this;
}

function getPeriod() {
    const now = new Date();
    let hours = now.getHours();
    let minutes = now.getMinutes();
    if ((hours == 8) || (hours == 9 && minutes < 45)) {
        // P1
        return 1;
    }
    if ((hours == 9 && minutes >= 45) || (hours == 11 && minutes < 5) || (hours == 10)) {
        // P2 / Break
        return 2;
    }
    if ((hours == 11 && minutes >= 5) || (hours == 12 && minutes < 5)) {
        // P3
        return 3;
    }
    if ((hours == 12 && minutes >= 5) || (hours == 13 && minutes < 5)) {
        // P4
        return 4;
    }
    if ((hours == 13 && minutes >= 5) || (hours == 15 && minutes < 15) || (hours == 14)) {
        // Lunch to P5
        return 5;
    } else {
        // too early / late
        return -1;
    }
}

function incrementUserSubmissions(userid) {
    const stmt = db.prepare(`UPDATE Users SET Submissions = Submissions + 1 WHERE Id=${parseInt(userid)};`);
    stmt.run();
}

app.use('/', e.static('../frontend/dist'));

app.get('/getPeriod', (req, res) => {
    // req has nothing
    // res has current period
    res.status(200).json({period: getPeriod()});
});

app.post('/currentRooms', (req, res) => {
    // req has day
    // res has all room at current time
    console.log("currentRooms");
    const currentPeriod = getPeriod();
    if (currentPeriod == -1) {
        res.status(418).send("Not in school");
        return;
    }
    const today = req.body.day;
    let stmt = db.prepare(`SELECT TimeSlots.Id, TimeSlots.Period, TimeSlots.Day, Timeslots.Room, Rooms.RoomName FROM TimeSlots INNER JOIN Rooms ON Rooms.Id=TimeSlots.Room WHERE TimeSlots.Period BETWEEN ${currentPeriod - 1} AND ${currentPeriod + 1} AND Timeslots.Day=${today} ORDER BY Rooms.RoomName ASC;`);
    let records = stmt.all();
    res.status(200).json({records: records});
});

app.post('/addTimeSlot', (req, res) => {
    // req has roomid userid period and day
    // res has success or faliure
    console.log("addTimeSlot");
    const body = req.body;
    let roomid = parseInt(body.roomid);
    let userid = parseInt(body.userid);
    let stmt = db.prepare(`INSERT INTO TimeSlots (Period, Day, Room) VALUES (${body.period}, ${body.day}, ${roomid});`);
    stmt.run();
    incrementUserSubmissions(userid)
    res.status(200).send("added timeslot");
});

app.post('/removeTimeSlot', (req, res) => {
    // req has roomid and userid
    // ress has success or faliure
    console.log("removeTimeSlot");
    const body = req.body;
    const slotid = parseInt(body.Id);
    const userid = parseInt(body.userId);
    let stmt = db.prepare(`DELETE FROM TimeSlots WHERE Id=${slotid};`);
    stmt.run();
    incrementUserSubmissions(userid);
    res.status(200).send("removed timeslot");
})

app.post('/addRoom', (req, res) => {
    // req has userid and roomname
    // res has success or faliure
    console.log("addRoom");
    const body = req.body;
    let name = req.body.roomName.toUpperCase();
    let stmt = db.prepare(`SELECT * FROM Rooms WHERE RoomName='${name}'`);
    let storedRecord = stmt.get();
    if (storedRecord) {
        res.status(418).send("room already exists");
        return;
    }
    stmt = db.prepare(`INSERT INTO Rooms (RoomName) VALUES ('${name}')`);
    stmt.run();
    incrementUserSubmissions(parseInt(body.userid));
    res.status(200).send("added room");
});

app.get('/getRooms', (req, res) => {
    // req has no data
    // res has success or faliure
    console.log("getRooms");
    let stmt = db.prepare(`SELECT * FROM Rooms ORDER BY RoomName ASC;`);
    let records = stmt.all();
    res.status(200).send({records: records});
});

app.post('/createUser', async (req, res) => {
    // req has email pass(hashed) and name
    // res has success or fail
    console.log("sign up");
    const body = req.body;
    let stmt = db.prepare(`SELECT * FROM Users WHERE Email='${body.email}';`);
    let storedRecord = stmt.get();
    if (storedRecord) {
        res.status(418).send("account with that email already exists");
        return;
    }
    const generatedHash = await bcrypt.hash(body.pass, 10);
    stmt = db.prepare(`INSERT INTO Users (Email, Pass, Username, Submissions) VALUES ('${body.email}', '${generatedHash}', '${body.name}', 0);`);
    stmt.run();
    stmt = db.prepare(`SELECT Id FROM Users WHERE Email='${body.email}';`);
    const uid = stmt.get();
    res.status(200).send({uid: uid});
});

app.post('/login', async (req, res) => {
    // req has email and pass(hashed)
    // res has success or fail
    console.log("login");
    const body = req.body;
    let stmt = db.prepare(`SELECT Pass FROM Users WHERE Email='${body.email}';`);
    let storedHash = stmt.get();
    if (!storedHash) {
        res.status(418).send("problem with email");
        return;
    }
    if (await bcrypt.compare(body.pass, storedHash.Pass)){
        stmt = db.prepare(`SELECT Id FROM Users WHERE Email='${body.email}';`);
        const uid = stmt.get();
        res.status(200).send({uid: uid});
    } else {
        res.status(418).send("incorrect password");
    }
});

app.listen(port, () => {
    console.log(`Listening on ${port}`);
});