<?php
error_reporting(0);
date_default_timezone_set("Asia/Dhaka");

/* ================= CONFIG ================= */

define("BOT_TOKEN", "YOUR_BOT_TOKEN");
define("BOT_USERNAME", "YOUR_BOT_USERNAME");
define("ADMIN_ID", "8528135139");

define("CHANNEL", "@bytestormbangladesh");
define("CHANNEL_LINK", "https://t.me/bytestormbangladesh");
define("BKASH", "01887787165");

define("DB_FILE", __DIR__ . "/data.json");

/* ================= DATABASE ================= */

function defaultDB() {
    return [
        "users" => [],
        "keys" => [
            "1" => [],
            "3" => [],
            "7" => [],
            "15" => [],
            "30" => []
        ],
        "free_keys" => [],
        "free_claims" => [],
        "prices" => [
            "1" => 20,
            "3" => 50,
            "7" => 100,
            "15" => 180,
            "30" => 300
        ],
        "deposits" => [],
        "apk" => [],
        "referrals" => []
    ];
}

function db() {
    if (!file_exists(DB_FILE)) {
        file_put_contents(
            DB_FILE,
            json_encode(defaultDB(), JSON_PRETTY_PRINT),
            LOCK_EX
        );
    }

    $data = json_decode(file_get_contents(DB_FILE), true);

    if (!is_array($data)) {
        $data = defaultDB();
    }

    return array_replace_recursive(defaultDB(), $data);
}

function saveDB($data) {
    file_put_contents(
        DB_FILE,
        json_encode($data, JSON_PRETTY_PRINT),
        LOCK_EX
    );
}

/* ================= TELEGRAM API ================= */

function api($method, $data = []) {
    $url = "https://api.telegram.org/bot" . BOT_TOKEN . "/" . $method;

    $ch = curl_init($url);

    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_CONNECTTIMEOUT => 10,
        CURLOPT_TIMEOUT => 30
    ]);

    $result = curl_exec($ch);
    curl_close($ch);

    return json_decode($result, true);
}

function sendMsg($chat, $text, $keyboard = null) {
    $data = [
        "chat_id" => $chat,
        "text" => $text,
        "parse_mode" => "HTML"
    ];

    if ($keyboard) {
        $data["reply_markup"] = json_encode($keyboard);
    }

    return api("sendMessage", $data);
}

function answerCallback($id, $text = "") {
    api("answerCallbackQuery", [
        "callback_query_id" => $id,
        "text" => $text
    ]);
}

/* ================= HELPERS ================= */

function isAdmin($id) {
    return (string)$id === (string)ADMIN_ID;
}

function blue($text) {
    return [
        "text" => $text,
        "style" => "primary"
    ];
}

function green($text) {
    return [
        "text" => $text,
        "style" => "success"
    ];
}

/* ================= KEYBOARDS ================= */

function mainMenu($admin = false) {
    $keyboard = [
        [blue("🛒 Buy Key"), green("🎁 Free Key")],
        [blue("💰 Balance"), green("➕ Add Fund")],
        [blue("📦 Stock"), green("👤 Profile")],
        [blue("📁 Get File"), green("👥 Referral")],
        [blue("ℹ️ Help")]
    ];

    if ($admin) {
        $keyboard[] = [green("⚙️ Admin Panel")];
    }

    return [
        "keyboard" => $keyboard,
        "resize_keyboard" => true,
        "is_persistent" => true
    ];
}

function adminMenu() {
    return [
        "keyboard" => [
            [green("➕ Add Paid Key"), blue("🎁 Add Free Key")],
            [green("💲 Set Price"), blue("📤 Upload APK")],
            [green("💳 Pending Deposits"), blue("📊 Statistics")],
            [blue("🏠 Main Menu")]
        ],
        "resize_keyboard" => true,
        "is_persistent" => true
    ];
}

function planMenu($data) {
    $buttons = [];

    foreach ($data["prices"] as $days => $price) {
        $buttons[] = blue($days . " Days - ৳" . $price);
    }

    $buttons = array_chunk($buttons, 2);

    $buttons[] = [
        green("🔙 Back"),
        blue("🏠 Main Menu")
    ];

    return [
        "keyboard" => $buttons,
        "resize_keyboard" => true,
        "is_persistent" => true
    ];
}

function joinMenu() {
    return [
        "inline_keyboard" => [
            [
                [
                    "text" => "🔵 Join Channel",
                    "url" => CHANNEL_LINK
                ]
            ],
            [
                [
                    "text" => "🟢 Verify",
                    "callback_data" => "verify"
                ]
            ]
        ]
    ];
}

/* ================= USER ================= */

function userExists($data, $id) {
    return isset($data["users"][(string)$id]);
}

function isJoined($id) {
    $res = api("getChatMember", [
        "chat_id" => CHANNEL,
        "user_id" => $id
    ]);

    if (empty($res["ok"])) {
        return false;
    }

    $status = $res["result"]["status"] ?? "";

    return in_array($status, [
        "member",
        "administrator",
        "creator"
    ]);
}

function createUser(&$data, $id, $ref = "") {
    $id = (string)$id;

    if (userExists($data, $id)) {
        return;
    }

    $data["users"][$id] = [
        "balance" => 0,
        "state" => "",
        "verified" => false,
        "ref" => $ref,
        "joined" => time(),
        "purchases" => 0
    ];
}

function referralBonus(&$data, $newUser) {
    $newUser = (string)$newUser;

    if (!isset($data["users"][$newUser])) {
        return;
    }

    $ref = (string)($data["users"][$newUser]["ref"] ?? "");

    if ($ref === "" || $ref === $newUser) {
        return;
    }

    if (!isset($data["users"][$ref])) {
        return;
    }

    if (isset($data["referrals"][$newUser])) {
        return;
    }

    $data["users"][$ref]["balance"] += 20;
    $data["referrals"][$newUser] = $ref;

    sendMsg(
        $ref,
        "🎉 <b>Referral Bonus!</b>\n\nYou received ৳20."
    );
}

function welcome($chat, $id) {
    sendMsg(
        $chat,
        "✅ <b>Verification Successful!</b>\n\nWelcome to Key Selling Bot.\nChoose an option:",
        mainMenu(isAdmin($id))
    );
}

/* ================= UPDATE ================= */

$update = json_decode(file_get_contents("php://input"), true);

if (!$update) {
    exit;
}

$data = db();

$message = $update["message"] ?? null;
$callback = $update["callback_query"] ?? null;

/* ================= CALLBACK HANDLER ================= */

if ($callback) {
    $callbackData = $callback["data"] ?? "";
    $id = (string)$callback["from"]["id"];
    $chat = $callback["message"]["chat"]["id"];
    $messageId = $callback["message"]["message_id"];

    /* Membership verification */

    if ($callbackData === "verify") {
        if (!isJoined($id)) {
            answerCallback(
                $callback["id"],
                "Please join the channel first!"
            );
            exit;
        }

        if (!userExists($data, $id)) {
            createUser($data, $id);
        }

        if (empty($data["users"][$id]["verified"])) {
            referralBonus($data, $id);
            $data["users"][$id]["verified"] = true;
            saveDB($data);
        }

        answerCallback($callback["id"], "Verified!");
        welcome($chat, $id);
        exit;
    }

    /* Deposit approval */

    if (
        strpos($callbackData, "approve_") === 0 ||
        strpos($callbackData, "reject_") === 0
    ) {
        if (!isAdmin($id)) {
            answerCallback($callback["id"], "Not allowed!");
            exit;
        }

        $parts = explode("_", $callbackData, 2);
        $action = $parts[0];
        $depositId = $parts[1];

        if (!isset($data["deposits"][$depositId])) {
            answerCallback($callback["id"], "Deposit not found!");
            exit;
        }

        $deposit = $data["deposits"][$depositId];

        if ($deposit["status"] !== "pending") {
            answerCallback($callback["id"], "Already processed!");
            exit;
        }

        $userId = (string)$deposit["user"];
        $amount = (float)$deposit["amount"];

        if ($action === "approve") {
            $data["users"][$userId]["balance"] += $amount;
            $data["deposits"][$depositId]["status"] = "approved";

            sendMsg(
                $userId,
                "✅ <b>Deposit Approved!</b>\n\n৳$amount added to your balance."
            );

            answerCallback($callback["id"], "Approved!");

            $statusText = "✅ <b>DEPOSIT APPROVED</b>";
        } else {
            $data["deposits"][$depositId]["status"] = "rejected";

            sendMsg(
                $userId,
                "❌ <b>Deposit Rejected!</b>\n\nPlease contact support."
            );

            answerCallback($callback["id"], "Rejected!");

            $statusText = "❌ <b>DEPOSIT REJECTED</b>";
        }

        saveDB($data);

        api("editMessageCaption", [
            "chat_id" => $chat,
            "message_id" => $messageId,
            "caption" => $statusText .
                "\n\nUser: <code>$userId</code>" .
                "\nAmount: ৳$amount",
            "parse_mode" => "HTML"
        ]);

        exit;
    }
}

/* ================= MESSAGE HANDLER ================= */

if (!$message) {
    exit;
}

$chat = $message["chat"]["id"];
$id = (string)$message["from"]["id"];
$text = trim($message["text"] ?? "");

$photo = $message["photo"] ?? [];
$document = $message["document"] ?? null;

/* ================= START ================= */

if (strpos($text, "/start") === 0) {
    $parts = explode(" ", $text, 2);
    $ref = $parts[1] ?? "";

    createUser($data, $id, $ref);

    if (isAdmin($id)) {
        $data["users"][$id]["verified"] = true;
        saveDB($data);
        welcome($chat, $id);
        exit;
    }

    if (!isJoined($id)) {
        saveDB($data);

        sendMsg(
            $chat,
            "🔒 <b>Channel Join Required</b>\n\nPlease join our official channel and press Verify.",
            joinMenu()
        );

        exit;
    }

    if (empty($data["users"][$id]["verified"])) {
        referralBonus($data, $id);
        $data["users"][$id]["verified"] = true;
        saveDB($data);
    }

    saveDB($data);
    welcome($chat, $id);
    exit;
}

/* ================= FORCE JOIN ================= */

if (!isAdmin($id)) {
    if (
        !userExists($data, $id) ||
        empty($data["users"][$id]["verified"]) ||
        !isJoined($id)
    ) {
        sendMsg(
            $chat,
            "🔒 Join our channel and verify first.",
            joinMenu()
        );
        exit;
    }
}

if (!userExists($data, $id)) {
    createUser($data, $id);
}

/* ================= NAVIGATION FIRST ================= */

if ($text === "🏠 Main Menu") {
    $data["users"][$id]["state"] = "";
    saveDB($data);

    sendMsg($chat, "🏠 Main Menu", mainMenu(isAdmin($id)));
    exit;
}

if ($text === "🔙 Back") {
    $data["users"][$id]["state"] = "";
    saveDB($data);

    sendMsg($chat, "🛒 Select a plan:", planMenu($data));
    exit;
}

if ($text === "⚙️ Admin Panel" && isAdmin($id)) {
    $data["users"][$id]["state"] = "";
    saveDB($data);

    sendMsg($chat, "⚙️ <b>Admin Control Panel</b>", adminMenu());
    exit;
}

/* ================= ADMIN MENU BUTTONS ================= */

if (isAdmin($id)) {

    if ($text === "➕ Add Paid Key") {
        $data["users"][$id]["state"] = "add_paid_key";
        saveDB($data);

        sendMsg(
            $chat,
            "➕ <b>Add Paid Key</b>\n\nSend in this format:\n<code>7 YOUR-KEY</code>"
        );
        exit;
    }

    if ($text === "🎁 Add Free Key") {
        $data["users"][$id]["state"] = "add_free_key";
        saveDB($data);

        sendMsg($chat, "Send your free key:");
        exit;
    }

    if ($text === "💲 Set Price") {
        $data["users"][$id]["state"] = "set_price";
        saveDB($data);

        sendMsg(
            $chat,
            "Send plan and price:\n<code>7 120</code>"
        );
        exit;
    }

    if ($text === "📤 Upload APK") {
        $data["users"][$id]["state"] = "upload_apk";
        saveDB($data);

        sendMsg($chat, "Send APK as a document:");
        exit;
    }

    if ($text === "📊 Statistics") {
        $pending = 0;

        foreach ($data["deposits"] as $deposit) {
            if ($deposit["status"] === "pending") {
                $pending++;
            }
        }

        $paidStock = 0;

        foreach ($data["keys"] as $keys) {
            $paidStock += count($keys);
        }

        sendMsg(
            $chat,
            "📊 <b>Statistics</b>\n\n" .
            "Users: " . count($data["users"]) . "\n" .
            "Pending Deposits: $pending\n" .
            "Paid Keys: $paidStock\n" .
            "Free Keys: " . count($data["free_keys"])
        );
        exit;
    }

    if ($text === "💳 Pending Deposits") {
        $found = false;

        foreach ($data["deposits"] as $depositId => $deposit) {
            if ($deposit["status"] !== "pending") {
                continue;
            }

            $found = true;

            $keyboard = [
                "inline_keyboard" => [[
                    [
                        "text" => "🟢 Approve",
                        "callback_data" => "approve_" . $depositId,
                        "style" => "success"
                    ],
                    [
                        "text" => "🔵 Reject",
                        "callback_data" => "reject_" . $depositId,
                        "style" => "primary"
                    ]
                ]]
            ];

            api("sendPhoto", [
                "chat_id" => $chat,
                "photo" => $deposit["file_id"],
                "caption" =>
                    "💰 <b>Deposit Request</b>\n\n" .
                    "User: <code>" . $deposit["user"] . "</code>\n" .
                    "Amount: ৳" . $deposit["amount"] . "\n" .
                    "ID: <code>$depositId</code>",
                "parse_mode" => "HTML",
                "reply_markup" => json_encode($keyboard)
            ]);
        }

        if (!$found) {
            sendMsg($chat, "No pending deposits.");
        }

        exit;
    }
}

/* ================= INPUT STATES ================= */

$state = $data["users"][$id]["state"] ?? "";

/* Add paid key */

if (isAdmin($id) && $state === "add_paid_key") {
    $parts = explode(" ", $text, 2);

    if (
        count($parts) !== 2 ||
        !isset($data["keys"][$parts[0]]) ||
        trim($parts[1]) === ""
    ) {
        sendMsg($chat, "Invalid format.\nExample: <code>7 YOUR-KEY</code>");
        exit;
    }

    $days = $parts[0];
    $key = trim($parts[1]);

    $data["keys"][$days][] = $key;
    $data["users"][$id]["state"] = "";

    saveDB($data);

    sendMsg($chat, "✅ Paid key added successfully.", adminMenu());
    exit;
}

/* Add free key */

if (isAdmin($id) && $state === "add_free_key") {
    if ($text === "") {
        sendMsg($chat, "Please send a valid key.");
        exit;
    }

    $data["free_keys"][] = $text;
    $data["users"][$id]["state"] = "";

    saveDB($data);

    sendMsg($chat, "✅ Free key added.", adminMenu());
    exit;
}

/* Set price */

if (isAdmin($id) && $state === "set_price") {
    $parts = preg_split('/\s+/', $text);

    if (
        count($parts) !== 2 ||
        !isset($data["prices"][$parts[0]]) ||
        !is_numeric($parts[1]) ||
        $parts[1] < 0
    ) {
        sendMsg($chat, "Invalid format.\nExample: <code>7 120</code>");
        exit;
    }

    $data["prices"][$parts[0]] = (float)$parts[1];
    $data["users"][$id]["state"] = "";

    saveDB($data);

    sendMsg($chat, "✅ Price updated.", adminMenu());
    exit;
}

/* Upload APK */

if (isAdmin($id) && $state === "upload_apk") {
    if (!$document) {
        sendMsg($chat, "Please send APK as a document.");
        exit;
    }

    $data["apk"][] = [
        "file_id" => $document["file_id"],
        "name" => $document["file_name"] ?? "Application"
    ];

    $data["users"][$id]["state"] = "";

    saveDB($data);

    sendMsg($chat, "✅ APK uploaded.", adminMenu());
    exit;
}

/* Deposit amount */

if ($state === "deposit_amount") {
    if (!is_numeric($text) || $text < 10) {
        sendMsg($chat, "Enter a valid amount. Minimum ৳10.");
        exit;
    }

    $data["users"][$id]["deposit_amount"] = (float)$text;
    $data["users"][$id]["state"] = "deposit_proof";

    saveDB($data);

    sendMsg(
        $chat,
        "💳 <b>Payment Details</b>\n\n" .
        "bKash: <code>" . BKASH . "</code>\n" .
        "Amount: ৳$text\n\n" .
        "Send your payment screenshot now."
    );
    exit;
}

/* Deposit proof */

if ($state === "deposit_proof") {
    if (empty($photo) && !$document) {
        sendMsg($chat, "Please send a payment screenshot.");
        exit;
    }

    $fileId = $document
        ? $document["file_id"]
        : end($photo)["file_id"];

    $depositId = uniqid("DEP");

    $amount = $data["users"][$id]["deposit_amount"];

    $data["deposits"][$depositId] = [
        "user" => $id,
        "amount" => $amount,
        "file_id" => $fileId,
        "status" => "pending",
        "time" => time()
    ];

    $data["users"][$id]["state"] = "";

    saveDB($data);

    sendMsg(
        $chat,
        "✅ Deposit proof submitted!\n\nPlease wait for admin approval.",
        mainMenu(false)
    );

    $keyboard = [
        "inline_keyboard" => [[
            [
                "text" => "🟢 Approve",
                "callback_data" => "approve_" . $depositId,
                "style" => "success"
            ],
            [
                "text" => "🔵 Reject",
                "callback_data" => "reject_" . $depositId,
                "style" => "primary"
            ]
        ]]
    ];

    api("sendPhoto", [
        "chat_id" => ADMIN_ID,
        "photo" => $fileId,
        "caption" =>
            "💰 <b>New Deposit Request</b>\n\n" .
            "User: <code>$id</code>\n" .
            "Amount: ৳$amount\n" .
            "ID: <code>$depositId</code>",
        "parse_mode" => "HTML",
        "reply_markup" => json_encode($keyboard)
    ]);

    exit;
}

/* ================= BUY KEY ================= */

if ($text === "🛒 Buy Key") {
    $data["users"][$id]["state"] = "";
    saveDB($data);

    sendMsg(
        $chat,
        "🛒 <b>Select Your Plan</b>",
        planMenu($data)
    );
    exit;
}

foreach ($data["prices"] as $days => $price) {
    if ($text === "$days Days - ৳$price") {

        $stock = $data["keys"][$days] ?? [];

        if (empty($stock)) {
            sendMsg(
                $chat,
                "❌ No stock available for this plan.",
                planMenu($data)
            );
            exit;
        }

        $balance = $data["users"][$id]["balance"];

        if ($balance < $price) {
            sendMsg(
                $chat,
                "❌ Insufficient Balance!\n\n" .
                "Price: ৳$price\n" .
                "Balance: ৳$balance",
                planMenu($data)
            );
            exit;
        }

        $key = array_shift($data["keys"][$days]);

        $data["users"][$id]["balance"] -= $price;
        $data["users"][$id]["purchases"]++;
        $data["users"][$id]["state"] = "";

        saveDB($data);

        sendMsg(
            $chat,
            "🎉 <b>Purchase Successful!</b>\n\n" .
            "Plan: $days Days\n" .
            "Key:\n<code>$key</code>\n\n" .
            "Thank you!",
            mainMenu(isAdmin($id))
        );
        exit;
    }
}

/* ================= FREE KEY ================= */

if ($text === "🎁 Free Key") {

    // One free key per user
    if (isset($data["free_claims"][$id])) {
        sendMsg(
            $chat,
            "❌ <b>Already Claimed!</b>\n\nYou have already received your Free Key. Only one Free Key is allowed per account.",
            mainMenu(isAdmin($id))
        );
        exit;
    }

    if (empty($data["free_keys"])) {
        sendMsg(
            $chat,
            "❌ No Free Keys Available.",
            mainMenu(isAdmin($id))
        );
        exit;
    }

    $key = array_shift($data["free_keys"]);

    $data["free_claims"][$id] = [
        "key" => $key,
        "time" => time()
    ];

    saveDB($data);

    sendMsg(
        $chat,
        "🎁 <b>Free Key Claimed!</b>\n\n<code>$key</code>\n\nYou can claim only one Free Key per account.",
        mainMenu(isAdmin($id))
    );

    exit;
}

/* ================= BALANCE ================= */

if ($text === "💰 Balance") {
    $balance = $data["users"][$id]["balance"];

    sendMsg(
        $chat,
        "💰 <b>Your Balance</b>\n\n৳$balance",
        mainMenu(isAdmin($id))
    );
    exit;
}

/* ================= ADD FUND ================= */

if ($text === "➕ Add Fund") {
    $data["users"][$id]["state"] = "deposit_amount";
    saveDB($data);

    sendMsg(
        $chat,
        "💳 <b>Add Fund</b>\n\nEnter the amount.\nMinimum: ৳10"
    );
    exit;
}

/* ================= PROFILE ================= */

if ($text === "👤 Profile") {
    $user = $data["users"][$id];

    sendMsg(
        $chat,
        "👤 <b>Your Profile</b>\n\n" .
        "ID: <code>$id</code>\n" .
        "Balance: ৳" . $user["balance"] . "\n" .
        "Purchases: " . $user["purchases"] . "\n" .
        "Joined: " . date("d M Y", $user["joined"]),
        mainMenu(isAdmin($id))
    );
    exit;
}

/* ================= REFERRAL ================= */

if ($text === "👥 Referral") {
    $link = "https://t.me/" . BOT_USERNAME . "?start=" . $id;

    $count = 0;

    foreach ($data["referrals"] as $newUser => $referrer) {
        if ((string)$referrer === $id) {
            $count++;
        }
    }

    sendMsg(
        $chat,
        "👥 <b>Your Referral</b>\n\n" .
        "Your link:\n<code>$link</code>\n\n" .
        "Successful referrals: $count\n" .
        "Bonus per referral: ৳20",
        mainMenu(isAdmin($id))
    );
    exit;
}

/* ================= STOCK ================= */

if ($text === "📦 Stock") {
    $msg = "📦 <b>Available Stock</b>\n\n";

    foreach ($data["prices"] as $days => $price) {
        $count = count($data["keys"][$days] ?? []);
        $msg .= "$days Days: $count keys\n";
    }

    $msg .= "\nFree Keys: " . count($data["free_keys"]);

    sendMsg($chat, $msg, mainMenu(isAdmin($id)));
    exit;
}

/* ================= GET FILE ================= */

if ($text === "📁 Get File") {
    if (empty($data["apk"])) {
        sendMsg($chat, "No files available.");
        exit;
    }

    foreach ($data["apk"] as $file) {
        api("sendDocument", [
            "chat_id" => $chat,
            "document" => $file["file_id"],
            "caption" => $file["name"]
        ]);
    }

    exit;
}

/* ================= HELP ================= */

if ($text === "ℹ️ Help") {
    sendMsg(
        $chat,
        "ℹ️ <b>Help Center</b>\n\n" .
        "🛒 Buy Key - Purchase keys\n" .
        "🎁 Free Key - Get free keys\n" .
        "💰 Balance - Check balance\n" .
        "➕ Add Fund - Deposit money\n" .
        "👥 Referral - Invite friends\n" .
        "📁 Get File - Download files\n\n" .
        "Contact admin for support.",
        mainMenu(isAdmin($id))
    );
    exit;
}

/* ================= DEFAULT ================= */

sendMsg(
    $chat,
    "Please select a button from the menu.",
    mainMenu(isAdmin($id))
);

?>