const express = require("express");
const sql = require("mssql");
const bcrypt = require("bcrypt");
const cors = require("cors");
const jwt = require("jsonwebtoken")
const dotenv = require("dotenv")

const serverPort = 3001;

const dev = process.argv.length > 2 && process.argv[2] == "-dev";

const app = express();
app.use(express.json());
app.use((req, res, next) =>{
    if (req.path.endsWith(".html")) {
        res.redirect(req.path.replace(".html", ""));
        return;
    }
    next();
})
app.use(express.static("public"))
app.use(cors({
    origin: [
        "https://project.rochesterx.dev",
        "https://localhost:3001"
    ]
}));

let dbConfig = null;

dbConfig = {
    user: "server",
    password: "TorusField1*",
    server: "mssql.rochesterx.dev",
    database: "ProjectTest",
    options: { trustServerCertificate: true }
};

let pool = null;
setupPool();

dotenv.config();

const JWT_SECRET = process.env.JWT_SECRET;
if (!JWT_SECRET) {
    throw new Error("JWT_SECRET not set in environment.");
}

async function setupPool() {
    pool = await sql.connect(dbConfig);
}

app.post("/register", async (req, res) => {
    const { username, password, role } = req.body;
    try {
        const hash = await bcrypt.hash(password, 10);
        await pool.request()
            .input("username", sql.VarChar, username)
            .input("hash", sql.VarChar, hash)
            .input("role", sql.VarChar, role)
            .query("INSERT INTO Users (Username, PasswordHash, Role, CreatedAt) VALUES (@username, @hash, @role, SYSUTCDATETIME())");
        res.send({ success: true, message: "User registered" })
    } catch (err) {
        if (err.message.includes("Violation of UNIQUE KEY constraint")) {
            res.status(500).send({ success: false, message: `Username "${username}" is already taken.` });
        }
        res.status(500).send({ success: false, message: err.message });
    }
});

app.post("/login", async (req, res) => {
    const { username, password } = req.body;
    try {
        const result = await pool.request()
            .input("username", sql.VarChar, username)
            .query("SELECT * FROM Users WHERE Username = @username");
        
        if (result.recordset.length == 0) return res.status(400).send({ message: "User not found" });

        const hash = result.recordset[0].PasswordHash;
        const isDeleted = result.recordset[0].IsDeleted;

        if (isDeleted === true) {
            return res.status(400).json({ message: "User not found (deleted)" })
        }

        const match = await bcrypt.compare(password, hash);

        if (match){
            const token = jwt.sign(result.recordset[0], JWT_SECRET, { expiresIn: "1h" });
            res.send({
                success: true,
                message: "Login successful",
                token
            });
            await pool.request()
                .input("username", sql.VarChar, username)
                .query("UPDATE Users SET LastLogin = SYSUTCDATETIME() WHERE Username = @username");
            
            console.log("Issued token: " + JSON.stringify(token))
        }
        else res.status(401).send({ success: false, message: "Invalid credentials" });
    } catch (err) {
        res.status(500).send({ success: false, message: err.message });
    }
});

app.post("/getPlayers", authenticate, async (req, res) => {
    const { player } = req.body;

    const result = await pool.request()
        .input("query", sql.VarChar, player)
        .query(`SELECT * FROM Player WHERE player_name LIKE '%' + @query + '%'`);

    res.status(200).json({ query: player, matches: result.recordset });
});

app.post("/getPlayer", authenticate, async (req, res) => {
    const { id } = req.body;

    const result = await pool.request()
        .input("query", sql.VarChar, id)
        .query(`SELECT * FROM Player WHERE player_id = @query`);

    if (result.recordset.length !== 1) {
        res.status(400).json({ success: false })
        return;
    }
    res.status(200).json({ success: true, match: result.recordset[0] });
});

app.post("/getInfo", authenticate, async (req, res) => {
    const userData = req.user;

    res.status(200).json(userData);
});

app.post("/getCourses", authenticate, async (req, res) => {
    const result = await pool.request()
        .query("SELECT * FROM Courses");

    const courses = result.recordset;

    res.status(200).json(courses);
});

app.post("/setInfo", authenticate, async (req, res) => {
    const { firstName, lastName, dob } = req.body;

    try {
        await pool.request()
            .input("username", sql.VarChar, req.user.Username)
            .input("firstName", sql.NVarChar(50), firstName)
            .input("lastName", sql.NVarChar(50), lastName)
            .input("dob", sql.Date, dob)
            .query(`
                UPDATE Users
                SET FirstName = @firstName,
                    LastName = @lastName,
                    DOB = @dob
                WHERE Username = @username
            `);
    } catch (error) {
        console.log(error);
        res.status(500).json({ message: "Update request failed" })
    }

    var updatedUser = req.user;
    updatedUser.FirstName = firstName;
    updatedUser.LastName = lastName;
    updatedUser.DOB = dob;

    const token = jwt.sign(updatedUser, JWT_SECRET);
    console.log("Issued token: " + JSON.stringify(token))
    res.status(200).send({
        success: true,
        message: "Information updated successfully",
        token
    });
});

app.post("/delete", authenticate, async (req, res) => {
    let { username, actor } = req.body;

    if (username === true) {
        username = req.user.Username;
    }
    if (actor === true) {
        actor = req.user.Username;
    }
        
    console.log(`Deleting user ${username}`);

    await pool.request()
        .input("username", sql.VarChar, username)
        .input("actor", sql.VarChar, actor)
        .query("UPDATE Users SET IsDeleted = 1, DeletedAt = SYSUTCDATETIME(), DeletedBy = @actor WHERE Username = @username");

    console.log(`User ${username} deleted`);
    res.status(200).json({ message: `User "${username}" deleted.` });
});

async function authenticate(req, res, next) {
    try {
        const authenticationHeader = req.headers["authorization"];
        console.log("authenticationheader: " + authenticationHeader);
        const token = authenticationHeader.split(" ")[1];

        console.log(JSON.stringify(authenticationHeader));
        const decoded = jwt.verify(token, JWT_SECRET);

        req.user = decoded;

        console.log(req.user);

        console.log(decoded.Username + " authenticated");
    } catch (error) {
        console.log("Authentication header missing");
        console.log(error);
        res.status(401).json({ message: "You are not logged in", error: error, logout: true });
        return;
    }
    next();
}

app.get("/player/:id", (req, res) => {
    res.sendFile(__dirname + "/public/player.html");
})

app.get("/search", (req, res) => {
    res.sendFile(__dirname + "/public/search.html");
})

app.get("/home", (req, res) => {
    res.sendFile(__dirname + "/public/home.html");
})

app.get("/info", (req, res) => {
    res.sendFile(__dirname + "/public/info.html");
})

app.get("/register", (req, res) => {
    res.sendFile(__dirname + "/public/register.html");
})

app.get("/login", (req, res) => {
    res.sendFile(__dirname + "/public/login.html");
})
app.listen(serverPort, "0.0.0.0", () => console.log(`Running ${dev ? "dev " : ""}server on port ${serverPort}`));