<?php
defined($security_key) or exit;

//------------------------------------------
// Payment Creation (for Software Upgrades)
//------------------------------------------
// This endpoint creates a Mollie payment and stores transaction data
// SECURITY: Price is calculated SERVER-SIDE, never trusted from frontend

//Connect to DB
$pdo = dbConnect($dbname);

//CONTENT FROM API (POST)
$post_content = json_decode($input, true);

// Validate required inputs
if (empty($post_content['serial_number']) || empty($post_content['version_id'])) {
    http_response_code(400);
    echo json_encode(['error' => 'Missing required fields: serial_number, version_id'], JSON_UNESCAPED_UNICODE);
    exit;
}

$serial_number = $post_content['serial_number'];
$version_id = $post_content['version_id'];
$user_data = $post_content['user_data'] ?? [];

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 1: Get equipment data from serial_number
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
$sql = 'SELECT rowID, sw_version, sw_version_license, hw_version FROM equipment WHERE serialnumber = ?';
$stmt = $pdo->prepare($sql);
$stmt->execute([$serial_number]);
$equipment = $stmt->fetch(PDO::FETCH_ASSOC);

if (!$equipment) {
    http_response_code(404);
    echo json_encode(['error' => 'Device not found with serial number: ' . $serial_number], JSON_UNESCAPED_UNICODE);
    exit;
}

$equipment_id = $equipment['rowID'];
$current_sw_version = trim(strtolower(ltrim($equipment['sw_version'], '0')));
$sw_version_license = $equipment['sw_version_license'] ?? null;
$hw_version = $equipment['hw_version'] ?? '';

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 2: Get version data from version_id
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
$sql = 'SELECT v.rowID as version_id, v.version, v.name, v.description, v.hw_version, p.productcode
        FROM products_software_versions v
        JOIN products_software p ON v.product_software_id = p.rowID
        WHERE v.rowID = ? AND v.is_active = 1';
$stmt = $pdo->prepare($sql);
$stmt->execute([$version_id]);
$version = $stmt->fetch(PDO::FETCH_ASSOC);

if (!$version) {
    http_response_code(404);
    echo json_encode(['error' => 'Software version not found or inactive'], JSON_UNESCAPED_UNICODE);
    exit;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 3: Calculate price SERVER-SIDE (same logic as software_update.php)
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
$final_price = '0.00';
$final_currency = '';

// Check if version has upgrade paths defined
$sql = 'SELECT COUNT(*) as path_count FROM products_software_upgrade_paths WHERE to_version_id = ? AND is_active = 1';
$stmt = $pdo->prepare($sql);
$stmt->execute([$version_id]);
$path_count_result = $stmt->fetch(PDO::FETCH_ASSOC);
$has_upgrade_paths = ($path_count_result['path_count'] > 0);

if (!$has_upgrade_paths) {
    // No upgrade paths defined = FREE (lines 240-242 in software_update.php)
    $final_price = '0.00';
} else {
    // Check for valid upgrade path FROM current version
    $sql = 'SELECT pup.price, pup.currency
            FROM products_software_upgrade_paths pup
            JOIN products_software_versions from_ver ON pup.from_version_id = from_ver.rowID
            WHERE pup.to_version_id = ?
                AND LOWER(TRIM(LEADING "0" FROM from_ver.version)) = ?
                AND pup.is_active = 1';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$version_id, $current_sw_version]);
    $upgrade_path = $stmt->fetch(PDO::FETCH_ASSOC);

    if ($upgrade_path) {
        $final_price = $upgrade_path['price'] ?? '0.00';
        $final_currency = $upgrade_path['currency'] ?? 'EUR';
    } else {
        // No upgrade path FROM current version
        http_response_code(400);
        echo json_encode(['error' => 'No valid upgrade path from current version'], JSON_UNESCAPED_UNICODE);
        exit;
    }
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 4: Check license validity (lines 280-311 in software_update.php)
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
if ($final_price > 0 && $sw_version_license) {
    $sql = 'SELECT status, start_at, expires_at
            FROM products_software_licenses
            WHERE license_key = ? AND equipment_id = ?';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$sw_version_license, $equipment_id]);
    $license = $stmt->fetch(PDO::FETCH_ASSOC);

    if ($license && $license['status'] == 1) {
        $now = date('Y-m-d H:i:s');
        $start_at = $license['start_at'];
        $expires_at = $license['expires_at'];

        // Check if license is within valid date range
        if ((!$start_at || $start_at <= $now) && (!$expires_at || $expires_at >= $now)) {
            $final_price = '0.00';
        }
    }
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 5: Verify price > 0 (free upgrades shouldn't reach payment API)
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
if ($final_price <= 0) {
    http_response_code(400);
    echo json_encode(['error' => 'This upgrade is free. No payment required.'], JSON_UNESCAPED_UNICODE);
    exit;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 6: DEBUG MODE - Simulate payment without Mollie
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
if (debug) {
    // Generate fake payment ID
    $fake_payment_id = 'DEBUG_' . uniqid() . '_' . time();
    $checkout_url = 'https://'.$_SERVER['SERVER_NAME'].'/softwaretool.php?payment_return=1&payment_id=' . $fake_payment_id;

    // Store transaction in DB
    $sql = 'INSERT INTO transactions (txn_id, payment_amount, payment_status, payer_email, first_name, last_name,
            address_street, address_city, address_state, address_zip, address_country, account_id, payment_method, created)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([
        $fake_payment_id,
        $final_price,
        0, // 0 = pending
        $user_data['email'] ?? '',
        $user_data['first_name'] ?? '',
        $user_data['last_name'] ?? '',
        $user_data['address_street'] ?? '',
        $user_data['address_city'] ?? '',
        $user_data['address_state'] ?? '',
        $user_data['address_zip'] ?? '',
        $user_data['address_country'] ?? '',
        $serial_number,
        0, // payment method
        date('Y-m-d H:i:s')
    ]);

    // Store transaction item with serial_number in item_options
    $item_options = json_encode([
        'serial_number' => $serial_number,
        'equipment_id' => $equipment_id,
        'hw_version' => $hw_version
    ], JSON_UNESCAPED_UNICODE);

    $sql = 'INSERT INTO transactions_items (txn_id, item_id, item_price, item_quantity, item_options, created)
            VALUES (?, ?, ?, ?, ?, ?)';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([
        $fake_payment_id,
        $version_id,
        $final_price,
        1,
        $item_options,
        date('Y-m-d H:i:s')
    ]);

    // Return fake checkout URL
    $messages = json_encode([
        'checkout_url' => $checkout_url,
        'payment_id' => $fake_payment_id,
        'debug_mode' => true
    ], JSON_UNESCAPED_UNICODE);
    echo $messages;
    exit;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++
// STEP 7: Call Mollie API to create payment
//+++++++++++++++++++++++++++++++++++++++++++++++++++++
try {
    // Initialize Mollie
    require dirname(__FILE__, 3).'/initialize.php';

    // Format price for Mollie (must be string with 2 decimals)
    $formatted_price = number_format((float)$final_price, 2, '.', '');

    // Create payment with Mollie
    $payment = $mollie->payments->create([
        'amount' => [
            'currency' => $final_currency ?: 'EUR',
            'value' => $formatted_price
        ],
        'description' => 'Software upgrade to ' . $version['name'] . ' (v' . $version['version'] . ')',
        'redirectUrl' => 'https://'.$_SERVER['SERVER_NAME'].'/softwaretool.php?payment_return=1&payment_id={id}',
        'webhookUrl' => 'https://'.$_SERVER['SERVER_NAME'].'/webhook_mollie.php',
        'metadata' => [
            'order_id' => $payment->id // Store payment ID in metadata
        ]
    ]);

    $mollie_payment_id = $payment->id;
    $checkout_url = $payment->getCheckoutUrl();

    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    // STEP 8: Store transaction in DB
    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    $sql = 'INSERT INTO transactions (txn_id, payment_amount, payment_status, payer_email, first_name, last_name,
            address_street, address_city, address_state, address_zip, address_country, account_id, payment_method, created)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([
        $mollie_payment_id,
        $final_price,
        0, // 0 = pending
        $user_data['email'] ?? '',
        $user_data['first_name'] ?? '',
        $user_data['last_name'] ?? '',
        $user_data['address_street'] ?? '',
        $user_data['address_city'] ?? '',
        $user_data['address_state'] ?? '',
        $user_data['address_zip'] ?? '',
        $user_data['address_country'] ?? '',
        $serial_number,
        0, // payment method
        date('Y-m-d H:i:s')
    ]);

    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    // STEP 9: Store transaction item with serial_number in item_options
    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    $item_options = json_encode([
        'serial_number' => $serial_number,
        'equipment_id' => $equipment_id,
        'hw_version' => $hw_version
    ], JSON_UNESCAPED_UNICODE);

    $sql = 'INSERT INTO transactions_items (txn_id, item_id, item_price, item_quantity, item_options, created)
            VALUES (?, ?, ?, ?, ?, ?)';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([
        $mollie_payment_id,
        $version_id,
        $final_price,
        1,
        $item_options,
        date('Y-m-d H:i:s')
    ]);

    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    // STEP 10: Return checkout URL and payment ID
    //+++++++++++++++++++++++++++++++++++++++++++++++++++++
    $messages = json_encode([
        'checkout_url' => $checkout_url,
        'payment_id' => $mollie_payment_id
    ], JSON_UNESCAPED_UNICODE);
    echo $messages;

} catch (Exception $e) {
    http_response_code(500);
    echo json_encode(['error' => 'Payment creation failed: ' . $e->getMessage()], JSON_UNESCAPED_UNICODE);
    exit;
}

?>