const express = require("express");
const sqlite = require("better-sqlite3");
const bcrypt = require("bcrypt");
const cors = require("cors");
const jwt = require("jsonwebtoken")
const dotenv = require("dotenv");
const Database = require("better-sqlite3");

const serverPort = 3006;

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"
    ]
}));

const db = new Database("project.db");
db.pragma("journal_mode = WAL")

dotenv.config();

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

app.post("/register", async (req, res) => {
    const { username, password, role, salt } = req.body;
    try {
        const hash = await bcrypt.hash(password, 10);

        const inputs = {
            username: username,
            hash: hash,
            role: role,
            salt: salt
        }
        const query = db.prepare("INSERT INTO Users (Username, PasswordHash, Role, CreatedAt, Salt) VALUES (@username, @hash, @role, datetime('now'), @salt)");
        query.run(inputs);

        res.send({ success: true, message: "User registered" })

    } catch (err) {
        if (err.message.includes("UNIQUE")) {
            res.status(500).send({ success: false, message: `Username "${username}" is already taken.` });
            return;
        }
        res.status(500).send({ success: false, message: err.message });
    }
});

app.post("/login", async (req, res) => {
    const { username, password } = req.body;
    //try {
        const query = db.prepare("SELECT * FROM Users WHERE Username = @username");
        const results = query.all({ username: username });
        
        if (results.length == 0) return res.status(400).send({ message: "User not found" });

        const hash = results[0].PasswordHash;
        const isDeleted = results[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(results[0], JWT_SECRET, { expiresIn: "1h" });
            res.send({
                success: true,
                message: "Login successful",
                token,
                salt: results[0].Salt
            });
            const update = db.prepare("UPDATE Users SET LastLogin = datetime('now') WHERE Username = @username");
            update.run({ 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("/getSalt", async (req, res) => {
    const { username } = req.body;
    try {
        const query = db.prepare("SELECT * FROM Users WHERE Username = @username");
        const results = query.all({ username: username });
        
        if (results.length == 0) return res.status(400).send({ message: "User not found" });

        const isDeleted = results[0].IsDeleted;

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

        res.send({
            salt: results[0].Salt
        });
    } catch (err) {
        res.status(500).send({ success: false, message: err.message });
    }
});

app.post("/setPassword", authenticate, async (req, res) => {
    try {
        const { name, iv, password } = req.body;

        const inputs = {
            name: name,
            userID: req.user.Id,
            iv: iv,
            password: password
        }

        const query = db.prepare("INSERT INTO Passwords (Name, UserID, Password, IV) VALUES (@name, @userID, @password, @iv)");
        query.run(inputs);

        res.status(200).json({ success: true, message: "Success" });
    } catch (err) {
        res.status(500).json({ success: false, message: err.message });
    }
});

app.post("/updatePassword", authenticate, async (req, res) => {
    try {
        const { name, iv, password } = req.body;

        const inputs = {
            name: name,
            userID: req.user.Id,
            iv: iv,
            password: password
        }

        const query = db.prepare("UPDATE Passwords SET Password = @password, IV = @iv WHERE UserID = @userID AND Name = @name");
        query.run(inputs);

        res.status(200).json({ success: true, message: "Success" });
    } catch (err) {
        res.status(500).json({ success: false, message: err.message });
    }
});

app.post("/getPassword", authenticate, async (req, res) => {
    try {
        const { name } = req.body;

        const query = db.prepare("SELECT * FROM Passwords WHERE UserID = @userID AND Name = @name");
        const results = query.all({ userID: req.user.Id, name: name});

        if (results.length == 0) {
            res.status(500).json({ success: false, message: `No password with name ${name}` });
            return;
        }

        if (results.length > 1) {
            res.status(500).json({ success: false, message: `More than one password with name ${name}` });
            return;
        }

        res.status(200).json({ password: results[0].Password, iv: results[0].IV, success: true, message: "Success" });
    } catch (err) {
        res.status(500).json({ success: false, message: err.message });
    }
});
        
app.post("/getPasswords", authenticate, async (req, res) => {
    try {
        const query = db.prepare("SELECT * FROM Passwords WHERE UserID = @userID");
        const results = query.all({ userID: req.user.Id});

        if (results.length == 0) {
            res.status(500).json({ success: false, message: `No passwords` });
            return;
        }

        res.status(200).json({ results: results, success: true, message: "Success" });
    } catch (err) {
        res.status(500).json({ success: false, message: err.message });
    }
});

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

    const query = db.prepare(`SELECT Player.PlayerName, Player.Team, Player.Position, Player.PlayerID FROM Watch JOIN Player ON Watch.PlayerID = Player.PlayerID WHERE UserID = @userID ORDER BY Player.PlayerName`);
    const watchlist = query.all({
        userID: req.user.Id,
        id: id
    });


    res.status(200).json({ watchlist: watchlist });
});

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

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

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}`);

    const query = ("UPDATE Users SET IsDeleted = 1, DeletedAt = datetime('now'), DeletedBy = @actor WHERE Username = @username");
    query.run({
        username: username,
        actor: actor
    });

    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}`));