<?php
/**
 * Auth Login Endpoint
 */

use App\Core\Database;
use App\Core\JWT;
use App\Core\Validator;

use App\Middleware\RateLimitMiddleware;
use App\Core\Security;

// 0. Rate Limiting (5 attempts per minute per IP)
RateLimitMiddleware::check(5, 60);

$data = Security::sanitize(input());

// 1. Validation
$errors = Validator::validate($data, [
    'email'    => 'required|email',
    'password' => 'required'
]);

if ($errors) {
    json_error('Validation Failed', 422, $errors);
}

$email = $data['email'];
$password = $data['password'];

// 2. DB Check (Using hash for lookup since email is encrypted)
$db = Database::getInstance();
$emailHash = hash('sha256', strtolower($email));
$stmt = $db->prepare("SELECT * FROM users WHERE email_hash = ? LIMIT 1");
$stmt->execute([$emailHash]);
$user = $stmt->fetch();

if (!$user || !password_verify($password, $user['password_hash'])) {
    json_error('بيانات الدخول غير صحيحة', 401);
}

$deviceId = $data['device_id'] ?? null;
$isReviewer = (strtolower($email) === 'reviewer@musadaq.jo');

if ($deviceId && !$isReviewer) {
    // Generate and send WhatsApp OTP
    $phone = $user['phone'] ? (\App\Core\Encryption::decrypt($user['phone']) ?: $user['phone']) : null;
    if (empty($phone)) {
        json_error('رقم الهاتف غير مسجل لهذا المستخدم. يرجى التواصل مع المسؤول.', 403);
    }

    $phone = preg_replace('/[^0-9+]/', '', $phone);
    $phone = ltrim($phone, '+');
    if (str_starts_with($phone, '07')) {
        $phone = '962' . substr($phone, 1);
    } elseif (str_starts_with($phone, '7')) {
        $phone = '962' . $phone;
    }

    $otp = str_pad((string)random_int(100000, 999999), 6, '0', STR_PAD_LEFT);
    $otpHash = password_hash($otp, PASSWORD_DEFAULT);
    $phoneHash = hash('sha256', $phone);

    $cacheDir = STORAGE_PATH . '/cache/otp';
    if (!is_dir($cacheDir)) {
        mkdir($cacheDir, 0755, true);
    }

    $otpData = [
        'hash' => $otpHash,
        'user_id' => $user['id'],
        'attempts' => 0,
        'max_attempts' => 5,
        'expires_at' => time() + 300,
        'created_at' => time(),
    ];

    $fp = fopen($cacheDir . '/otp_' . $phoneHash . '.json', 'w');
    if ($fp) {
        flock($fp, LOCK_EX);
        fwrite($fp, json_encode($otpData));
        flock($fp, LOCK_UN);
        fclose($fp);
    }

    $whatsappService = new \App\Services\WhatsAppProxyService();
    $message = "رمز التحقق لتطبيق مُصادَق:\n*{$otp}*\n\nصالح لمدة 5 دقائق.";
    $result = $whatsappService->sendMessage($phone, $message);

    if (!$result['success']) {
        error_log("ERROR: Failed to send OTP WhatsApp to phone: {$phone}");
        json_error('عذراً، فشل في إرسال رمز التحقق. يرجى المحاولة مرة أخرى.', 500);
    }

    if (env('APP_DEBUG', 'false') === 'true') {
        error_log("DEV OTP for {$phone}: {$otp}");
    }

    json_success([
        'otp_required' => true,
        'phone' => $phone,
    ], 'تم إرسال رمز التحقق إلى رقم هاتفك المسجل عبر واتساب');
    exit;
}

// 3. Handle device registration if provided (for mobile app login)
$deviceName = $data['device_name'] ?? 'Web Browser';
$deviceSecret = null;

if ($deviceId) {
    $deviceSecret = hash('sha256', $user['id'] . $deviceId . bin2hex(random_bytes(16)));
    $stmt = $db->prepare("
        INSERT INTO user_devices (id, user_id, device_fingerprint, device_name, platform, app_version, device_secret, is_trusted, last_seen_at)
        VALUES (UUID(), ?, ?, ?, ?, ?, ?, TRUE, NOW())
        ON DUPLICATE KEY UPDATE
            device_name = VALUES(device_name),
            platform = VALUES(platform),
            app_version = VALUES(app_version),
            device_secret = VALUES(device_secret),
            is_trusted = TRUE,
            last_seen_at = NOW(),
            updated_at = NOW()
    ");
    $stmt->execute([
        $user['id'],
        $deviceId,
        $deviceName,
        $data['platform'] ?? 'web',
        $data['app_version'] ?? '1.0.0',
        password_hash($deviceSecret, PASSWORD_DEFAULT),
    ]);
}

// 4. Issue Token
$secret = env('JWT_SECRET');
if (!$secret || strlen($secret) < 32) {
    error_log('FATAL: JWT_SECRET is missing or too short in .env');
    json_error('Server configuration error', 500);
}

// Longer expiry for mobile (30 days), short for web (15 mins)
$expiry = $deviceId ? (30 * 24 * 3600) : (15 * 60);

$payload = [
    'user_id'   => $user['id'],
    'tenant_id' => $user['tenant_id'],
    'role'      => $user['role'],
    'device_id' => $deviceId,
    'source'    => $deviceId ? 'mobile' : 'web',
    'exp'       => time() + $expiry
];

$token = JWT::encode($payload, $secret);

// 5. Update Refresh Token (Hashed before storage for security)
$refreshToken = bin2hex(random_bytes(32));
$refreshTokenHash = hash('sha256', $refreshToken);
$stmt = $db->prepare("UPDATE users SET refresh_token_hash = ?, last_login_at = NOW() WHERE id = ?");
$stmt->execute([$refreshTokenHash, $user['id']]);

// 6. Secure Refresh Token delivery via HttpOnly Cookie (for web)
if (!$deviceId) {
    setcookie('refresh_token', $refreshToken, [
        'expires'  => time() + (7 * 24 * 60 * 60), // 7 days
        'path'     => '/api/v1/auth/refresh',
        'secure'   => true,
        'httponly' => true,
        'samesite' => 'Strict',
    ]);
}

json_success([
    'access_token'  => $token,
    'refresh_token' => $refreshToken,
    'device_secret' => $deviceSecret,
    'user' => [
        'id'    => $user['id'],
        'name'  => (App\Core\Encryption::decrypt($user['name']) ?: $user['name']),
        'email' => (App\Core\Encryption::decrypt($user['email']) ?: $user['email']),
        'role'  => $user['role'],
        'tenant_id' => $user['tenant_id']
    ]
], 'تم تسجيل الدخول بنجاح');