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const http = require("http");
const fs = require("fs");

const {
    default: makeWASocket,
    useMultiFileAuthState,
    fetchLatestBaileysVersion
} = require("@whiskeysockets/baileys");

const PORT = process.env.PORT || 5900;

let sock;
let initialized = false;

// ๐ŸŒ HTML UI
const htmlContent = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Baileys Linker</title>
<style>
body {
    font-family: system-ui, sans-serif;
    background: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.box {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 360px;
    text-align: center;
}
input, select {
    width: 90%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}
button {
    background: #25D366;
    color: white;
    border: none;
    padding: 12px;
    width: 97%;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    font-weight: bold;
}
button:hover {
    background: #1ebd56;
}
</style>
</head>
<body>

<div class="box">
    <h2>Link WhatsApp Account</h2>
    <p>Enter your number with country code</p>

    <form method="GET" action="/get-code">

        <select name="country">
            <option value="373">๐Ÿ‡ฒ๐Ÿ‡ฉ Moldova (+373)</option>
            <option value="1">๐Ÿ‡บ๐Ÿ‡ธ United States (+1)</option>
            <option value="44">๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom (+44)</option>
            <option value="91">๐Ÿ‡ฎ๐Ÿ‡ณ India (+91)</option>
        </select>

        <input type="text" name="phone" placeholder="Phone number" required>

        <button type="submit">Generate Pairing Code</button>
    </form>
</div>

</body>
</html>
`;

// ๐Ÿš€ HTTP SERVER (NO url module)
const server = http.createServer(async (req, res) => {

    // HOME PAGE
    if (req.url === "/") {
        res.writeHead(200, { "Content-Type": "text/html" });
        return res.end(htmlContent);
    }

    // GET CODE (manual parsing, NO url module)
    if (req.url.startsWith("/get-code")) {

        // extract query manually
        const queryString = req.url.split("?")[1] || "";
        const params = {};

        queryString.split("&").forEach(pair => {
            const [key, value] = pair.split("=");
            if (key) params[key] = decodeURIComponent(value || "");
        });

        const country = params.country;
        const phone = params.phone;

        const number = country + phone;

        try {

            if (!initialized) {
                const { state, saveCreds } = await useMultiFileAuthState("auth");
                const { version } = await fetchLatestBaileysVersion();

                sock = makeWASocket({
                    version,
                    auth: state,
                    printQRInTerminal: false
                });

                sock.ev.on("creds.update", saveCreds);

                sock.ev.on("connection.update", (update) => {
                    if (update.connection === "open") {
                        console.log("WhatsApp Connected");
                    }
                });

                initialized = true;
            }

            const code = await sock.requestPairingCode(number);

            console.log("PAIR CODE:", code);

            res.writeHead(200, { "Content-Type": "text/html" });
            return res.end(`
                <h2>Pairing Code Generated</h2>
                <h1>${code}</h1>
                <a href="/">Back</a>
            `);

        } catch (err) {
            console.log(err);
            res.writeHead(500);
            return res.end("Error generating pairing code");
        }
    }

    res.writeHead(404);
    res.end("Not Found");
});

// ๐ŸŒ START SERVER
server.listen(PORT, "0.0.0.0", () => {
    console.log("server running on http://127.0.0.1:" + PORT);
});