<?php

namespace App\Http\Controllers;

use App\Models\Driver;
use App\Models\Passenger;
use App\Models\DriverToken;
use App\Models\PassengerToken;
use App\Models\CarRegistration;
use App\Models\DriverDocument;
use App\Helpers\LegacyEncryption;
use Firebase\JWT\JWT;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;

/**
 * متحكم الهوية والوصول (Authentication Controller)
 * 
 * الغرض من الملف:
 * إدارة عمليات تسجيل الدخول وإنشاء الحسابات لجميع أنواع المستخدمين (ركاب، سائقين، مدراء).
 * 
 * كيفية العمل:
 * 1. يستقبل بيانات الاعتماد (مثل الهاتف وكلمة المرور).
 * 2. يتحقق من صحة البيانات بمقارنتها بما هو موجود في قاعدة البيانات.
 * 3. عند نجاح التحقق، يقوم بتوليد رمز وصول (JWT Token) مشفر يُستخدم في الطلبات اللاحقة.
 * 4. يدير أيضاً تسجيل "بصمة الجهاز" لإرسال التنبيهات لاحقاً.
 */
class AuthController extends Controller
{
    private LegacyEncryption $encryption;

    public function __construct(LegacyEncryption $encryption)
    {
        $this->encryption = $encryption;
    }

    // ══════════════════════════════════════════════
    // PASSENGER LOGIN
    // ══════════════════════════════════════════════

    /**
     * POST /v2/auth/passenger/login
     * Replaces: login.php
     */
    public function passengerLogin(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'fcm_token' => 'required|string',
        ]);

        $phone = $request->input('phone');
        $password = $request->input('password');
        $fingerprint = $request->input('fingerprint');
        $fcmToken = $request->input('fcm_token');

        // Rate limiting: 5 attempts per minute per (IP + Phone)
        $rateLimitKey = 'login_passenger:' . $request->ip() . ':' . $phone;
        if (Cache::get($rateLimitKey, 0) >= config('intaleq.rate_limit_login', 5)) {
            return $this->failure('Too many login attempts. Please try again later.', 429);
        }
        Cache::increment($rateLimitKey);
        Cache::put($rateLimitKey, Cache::get($rateLimitKey), config('intaleq.rate_limit_login_decay', 60));

        // Find passenger by encrypted phone
        $encryptedPhone = $this->encryption->encrypt($phone);
        $passenger = Passenger::active()
            ->where('phone', $encryptedPhone)
            ->first();

        if (!$passenger) {
            return $this->failure('Invalid credentials');
        }

        // Verify password (bcrypt)
        if (!password_verify($password, $passenger->password)) {
            return $this->failure('Invalid credentials');
        }

        // Verify device fingerprint
        $token = PassengerToken::where('passengerID', $passenger->id)->first();
        if ($token && $token->fingerPrint !== $fingerprint) {
            return $this->failure('Device mismatch. Please login from your registered device.');
        }

        // Update FCM token
        if ($token) {
            $encryptedFcm = $this->encryption->encrypt($fcmToken);
            $token->update(['token' => $encryptedFcm]);
        }

        // Generate API keys if not exist
        if (empty($passenger->api_key)) {
            $this->generateApiKeys($passenger);
        }

        // Generate JWT
        $jwt = $this->createJwt($passenger->id, 'passenger', $fingerprint, 86400); // 24h

        return $this->success([
            'token' => $jwt,
            'expires_in' => 86400,
            'user_id' => $passenger->id,
            'api_key' => $passenger->api_key,
            'api_secret' => $passenger->api_secret,
        ]);
    }

    /**
     * POST /v2/auth/passenger/register
     * Replaces: loginFirstTime.php
     */
    public function passengerRegister(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'email' => 'required|email',
            'password' => 'required|string|min:6',
            'first_name' => 'required|string',
            'last_name' => 'required|string',
            'gender' => 'required|string',
            'birthdate' => 'required|string',
            'site' => 'required|string',
            'fingerprint' => 'required|string',
            'fcm_token' => 'required|string',
        ]);

        $phone = $request->input('phone');
        $encryptedPhone = $this->encryption->encrypt($phone);

        // Check if already exists
        $exists = Passenger::where('phone', $encryptedPhone)->exists();
        if ($exists) {
            return $this->failure('Phone number already registered');
        }

        // Generate a 19-digit numeric ID for better indexing performance
        $passengerId = (string) mt_rand(1000000000, 9999999999) . mt_rand(100000000, 999999999);

        // Encrypt sensitive fields
        $passenger = Passenger::create([
            'id' => $passengerId,
            'phone' => $encryptedPhone,
            'email' => $this->encryption->encrypt($request->input('email')),
            'password' => password_hash($request->input('password'), PASSWORD_BCRYPT),
            'first_name' => $this->encryption->encrypt($request->input('first_name')),
            'last_name' => $this->encryption->encrypt($request->input('last_name')),
            'gender' => $this->encryption->encrypt($request->input('gender')),
            'birthdate' => $this->encryption->encrypt($request->input('birthdate')),
            'site' => $request->input('site'),
        ]);

        // Create FCM token record
        PassengerToken::create([
            'token' => $this->encryption->encrypt($request->input('fcm_token')),
            'passengerID' => $passengerId,
            'fingerPrint' => $request->input('fingerprint'),
        ]);

        // Generate API keys
        $this->generateApiKeys($passenger);

        // Generate 24h JWT for immediate use after registration
        $jwt = $this->createJwt($passengerId, 'passenger', $request->input('fingerprint'), 86400);

        return $this->success([
            'token' => $jwt,
            'expires_in' => 86400,
            'user_id' => $passengerId,
            'api_key' => $passenger->api_key,
            'api_secret' => $passenger->api_secret,
        ], 201);
    }

    // ══════════════════════════════════════════════
    // DRIVER LOGIN
    // ══════════════════════════════════════════════

    /**
     * POST /v2/auth/driver/login
     * Replaces: loginJwtDriver.php
     */
    public function driverLogin(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'fcm_token' => 'required|string',
        ]);

        $phone = $request->input('phone');
        $password = $request->input('password');
        $fingerprint = $request->input('fingerprint');
        $fcmToken = $request->input('fcm_token');

        // Rate limiting: 5 attempts per minute per (IP + Phone)
        $rateLimitKey = 'login_driver:' . $request->ip() . ':' . $phone;
        if (Cache::get($rateLimitKey, 0) >= config('intaleq.rate_limit_login', 5)) {
            return $this->failure('Too many login attempts. Please try again later.', 429);
        }
        Cache::increment($rateLimitKey);
        Cache::put($rateLimitKey, Cache::get($rateLimitKey), config('intaleq.rate_limit_login_decay', 60));

        $encryptedPhone = $this->encryption->encrypt($phone);

        $driver = Driver::active()
            ->where('phone', $encryptedPhone)
            ->first();

        if (!$driver) {
            return $this->failure('Invalid credentials');
        }

        // HMAC password verification (V1 uses this for drivers)
        $storedPassword = $driver->password;
        if (!password_verify($request->input('password'), $storedPassword) &&
            !hash_equals($storedPassword, hash_hmac('sha256', $request->input('password'), config('intaleq.jwt_secret')))) {
            return $this->failure('Invalid credentials');
        }

        // Verify fingerprint
        $driverToken = DriverToken::where('captain_id', $driver->id)->first();
        if ($driverToken && $driverToken->fingerPrint !== $request->input('fingerprint')) {
            return $this->failure('Device mismatch');
        }

        // Update FCM token
        $encryptedFcm = $this->encryption->encrypt($request->input('fcm_token'));
        if ($driverToken) {
            $driverToken->update([
                'token' => $encryptedFcm,
                'fingerPrint' => $request->input('fingerprint'),
            ]);
        } else {
            DriverToken::create([
                'token' => $encryptedFcm,
                'captain_id' => $driver->id,
                'fingerPrint' => $request->input('fingerprint'),
            ]);
        }

        // Generate API keys if not exist
        if (empty($driver->api_key)) {
            $this->generateApiKeys($driver);
        }

        $jwt = $this->createJwt($driver->id, 'driver', $request->input('fingerprint'), 86400);

        return $this->success([
            'token' => $jwt,
            'expires_in' => 86400,
            'user_id' => $driver->id,
            'api_key' => $driver->api_key,
            'api_secret' => $driver->api_secret,
        ]);
    }

    /**
     * POST /v2/auth/driver/register
     * Replaces: auth/syria/driver/register_driver_and_car_signed.php
     */
    public function driverRegister(Request $request): JsonResponse
    {
        $request->validate([
            // Driver Basic Info
            'phone' => 'required|string',
            'email' => 'required|email',
            'password' => 'required|string|min:6',
            'first_name' => 'required|string',
            'last_name' => 'required|string',
            'gender' => 'required|string',
            'birthdate' => 'required|string',
            'site' => 'required|string',
            'fingerprint' => 'required|string',
            'fcm_token' => 'required|string',

            // Additional Legacy Fields
            'license_type' => 'nullable|string',
            'national_number' => 'nullable|string',
            'name_arabic' => 'nullable|string',
            'issue_date' => 'nullable|string',
            'expiry_date' => 'nullable|string',
            'license_categories' => 'nullable|string',
            'address' => 'nullable|string',
            'licenseIssueDate' => 'nullable|string',
            'accountBank' => 'nullable|string',
            'bankCode' => 'nullable|string',
            'employmentType' => 'nullable|string',
            'maritalStatus' => 'nullable|string',
            'fullNameMaritial' => 'nullable|string',
            'expirationDate' => 'nullable|string',
            
            // Car Info
            'vin' => 'required|string',
            'car_plate' => 'required|string',
            'make' => 'required|string',
            'model' => 'required|string',
            'year' => 'required|integer',
            'expiration_date' => 'required|string',
            'color' => 'required|string',
            'owner' => 'required|string',
            'color_hex' => 'required|string',
            'fuel' => 'required|string',

            // Document Signed URLs
            'driver_license_front_url' => 'required|url',
            'driver_license_back_url' => 'required|url',
            'car_license_front_url' => 'required|url',
            'car_license_back_url' => 'required|url',
        ]);

        $encryptedPhone = $this->encryption->encrypt($request->input('phone'));

        if (Driver::where('phone', $encryptedPhone)->exists()) {
            return $this->failure('Phone number already registered');
        }

        // Generate a 19-digit numeric ID for better indexing performance
        $driverId = (string) mt_rand(1000000000, 9999999999) . mt_rand(100000000, 999999999);

        return DB::transaction(function () use ($request, $driverId, $encryptedPhone) {
            // 1. Create Driver (with all 19+ fields)
            $driver = Driver::create([
                'id'                 => $driverId,
                'phone'              => $encryptedPhone,
                'email'              => $this->encryption->encrypt($request->input('email')),
                'password'           => password_hash($request->input('password'), PASSWORD_BCRYPT),
                'first_name'         => $this->encryption->encrypt($request->input('first_name')),
                'last_name'          => $this->encryption->encrypt($request->input('last_name')),
                'gender'             => $this->encryption->encrypt($request->input('gender', 'male')),
                'birthdate'          => $this->encryption->encrypt($request->input('birthdate')),
                'site'               => $request->input('site'),
                'license_type'       => $request->input('license_type', 'none'),
                'national_number'    => $this->encryption->encrypt($request->input('national_number', '0000')),
                'name_arabic'        => $this->encryption->encrypt($request->input('name_arabic', 'none')),
                'issue_date'         => $request->input('issue_date', '0000-00-00'),
                'expiry_date'        => $request->input('expiry_date', '0000-00-00'),
                'license_categories' => $request->input('license_categories', 'B'),
                'address'            => $this->encryption->encrypt($request->input('address', 'none')),
                'licenseIssueDate'   => $request->input('licenseIssueDate', '0000-00-00'),
                'accountBank'        => $request->input('accountBank', 'yet'),
                'bankCode'           => $request->input('bankCode', 'yet'),
                'employmentType'     => $request->input('employmentType', 'yet'),
                'maritalStatus'      => $request->input('maritalStatus', 'yet'),
                'fullNameMaritial'   => $request->input('fullNameMaritial', 'yet'),
                'expirationDate'     => $request->input('expirationDate', 'yet'),
                'status'             => 'yet',
            ]);

            // 2. Register Car
            CarRegistration::create([
                'driverID' => $driverId,
                'vin' => $request->input('vin'),
                'car_plate' => $request->input('car_plate'),
                'make' => $request->input('make'),
                'model' => $request->input('model'),
                'year' => $request->input('year'),
                'expiration_date' => $request->input('expiration_date'),
                'color' => $request->input('color'),
                'owner' => $request->input('owner'),
                'color_hex' => $request->input('color_hex'),
                'fuel' => $request->input('fuel'),
                'isDefault' => 1,
                'status' => 'yet',
            ]);

            // 3. Save Document URLs
            $docUrlKeys = [
                'driver_license_front_url' => 'driver_license_front',
                'driver_license_back_url' => 'driver_license_back',
                'car_license_front_url' => 'car_license_front',
                'car_license_back_url' => 'car_license_back',
            ];

            foreach ($docUrlKeys as $requestKey => $docType) {
                $url = $request->input($requestKey);
                DriverDocument::create([
                    'driverID' => $driverId,
                    'doc_type' => $docType,
                    'image_name' => 'signed_url_ref',
                    'link' => $url,
                    'upload_date' => now(),
                ]);
            }

            // 4. Create Token & Keys
            DriverToken::create([
                'token' => $this->encryption->encrypt($request->input('fcm_token')),
                'captain_id' => $driverId,
                'fingerPrint' => $request->input('fingerprint'),
            ]);

            $this->generateApiKeys($driver);

            $jwt = $this->createJwt($driverId, 'driver', $request->input('fingerprint'), 86400);

            return $this->success([
                'token' => $jwt,
                'expires_in' => 86400,
                'user_id' => $driverId,
                'api_key' => $driver->api_key,
                'api_secret' => $driver->api_secret,
            ], 201);
        });
    }

    // ══════════════════════════════════════════════
    // WALLET LOGIN (Higher security)
    // ══════════════════════════════════════════════

    /**
     * POST /v2/auth/passenger/wallet-login
     * Replaces: loginWallet.php
     */
    public function passengerWalletLogin(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $audience = $request->input('aud');
        if (!in_array($audience, config('intaleq.wallet_allowed_audiences', []))) {
            return $this->failure('Invalid audience', 403);
        }

        // Stricter rate limit for wallet
        $rateLimitKey = 'wallet_login:' . $request->ip();
        if (Cache::get($rateLimitKey, 0) >= 3) {
            return $this->failure('Too many attempts', 429);
        }
        Cache::increment($rateLimitKey);
        Cache::put($rateLimitKey, Cache::get($rateLimitKey), 120);

        $encryptedPhone = $this->encryption->encrypt($request->input('phone'));
        $passenger = Passenger::active()->where('phone', $encryptedPhone)->first();

        if (!$passenger || !password_verify($request->input('password'), $passenger->password)) {
            return $this->failure('Invalid credentials');
        }

        // V1 Security: Verify device fingerprint
        $token = PassengerToken::where('passengerID', $passenger->id)->first();
        if (!$token || $token->fingerPrint !== $request->input('fingerprint')) {
            return $this->failure('Device fingerprint verification failed', 403);
        }

        // V1 Security: Short-lived token (60s) with Issuer and Audience
        $jwt = $this->createWalletJwt($passenger->id, $request->input('fingerprint'), $audience, 60);
        $hmac = hash_hmac('sha256', $passenger->id, config('intaleq.wallet_hmac_secret'));

        return $this->success([
            'status' => 'success',
            'jwt' => $jwt,
            'hmac' => $hmac,
            'expires_in' => 60,
            'user_id' => $passenger->id,
        ]);
    }

    /**
     * POST /v2/auth/driver/wallet-login
     * Replaces: loginJwtWalletDriver.php
     */
    public function driverWalletLogin(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $audience = $request->input('aud');
        if (!in_array($audience, config('intaleq.wallet_allowed_audiences', []))) {
            return $this->failure('Invalid audience', 403);
        }

        // Rate limit
        $rateLimitKey = 'wallet_login_driver:' . $request->ip();
        if (Cache::get($rateLimitKey, 0) >= 3) {
            return $this->failure('Too many attempts', 429);
        }
        Cache::increment($rateLimitKey);
        Cache::put($rateLimitKey, Cache::get($rateLimitKey), 120);

        $encryptedPhone = $this->encryption->encrypt($request->input('phone'));
        $driver = Driver::active()->where('phone', $encryptedPhone)->first();

        if (!$driver || !password_verify($request->input('password'), $driver->password)) {
            return $this->failure('Invalid credentials');
        }

        // V1 Security: Verify device fingerprint
        $token = DriverToken::where('captain_id', $driver->id)->first();
        if (!$token || $token->fingerPrint !== $request->input('fingerprint')) {
            return $this->failure('Device fingerprint verification failed', 403);
        }

        // V1 Security: Short-lived token (60s) with Issuer and Audience
        $jwt = $this->createWalletJwt($driver->id, $request->input('fingerprint'), $audience, 60);
        $hmac = hash_hmac('sha256', $driver->id, config('intaleq.wallet_hmac_secret'));

        return $this->success([
            'status' => 'success',
            'jwt' => $jwt,
            'hmac' => $hmac,
            'expires_in' => 60,
            'user_id' => $driver->id,
        ]);
    }

    // ══════════════════════════════════════════════
    // ADMIN LOGIN
    // ══════════════════════════════════════════════

    /**
     * POST /v2/auth/admin/login
     * Replaces: loginAdmin.php
     */
    public function adminLogin(Request $request): JsonResponse
    {
        $request->validate([
            'device_number' => 'required|string',
            'password' => 'required|string',
        ]);

        $admin = DB::connection('primary')
            ->table('adminUser')
            ->where('device_number', $request->input('device_number'))
            ->first();

        if (!$admin) {
            return $this->failure('Invalid credentials');
        }

        $jwt = $this->createJwt((string)$admin->id, 'admin', $request->input('device_number'), 900);

        return $this->success([
            'token' => $jwt,
            'expires_in' => 900,
            'user_id' => $admin->id,
        ]);
    }

    /**
     * POST /v2/auth/admin/wallet-login
     * Replaces: loginWalletAdmin.php
     */
    public function adminWalletLogin(Request $request): JsonResponse
    {
        $request->validate([
            'id' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $audience = $request->input('aud');
        if (!in_array($audience, config('intaleq.wallet_allowed_audiences', []))) {
            return $this->failure('Invalid audience', 403);
        }

        // Verify Admin via device_number (as in V1 script)
        $admin = DB::connection('primary')
            ->table('adminUser')
            ->where('device_number', $request->input('fingerprint'))
            ->first();

        if (!$admin) {
            return $this->failure('User not found', 403);
        }

        // V1 Security: Short-lived token (60s) with Issuer and Audience
        $jwt = $this->createWalletJwt((string)$admin->id, $request->input('fingerprint'), $audience, 60);
        $hmac = hash_hmac('sha256', (string)$admin->id, config('intaleq.wallet_hmac_secret'));

        return $this->success([
            'status' => 'success',
            'jwt' => $jwt,
            'hmac' => $hmac,
            'expires_in' => 60,
            'user_id' => $admin->id,
        ]);
    }

    // ══════════════════════════════════════════════
    // HELPERS
    // ══════════════════════════════════════════════

    private function createWalletJwt(string $userId, string $fingerprint, string $audience, int $expiry = 60): string
    {
        // V1 Security: Hash fingerprint with pepper before embedding in JWT
        $fpPepper = config('intaleq.fp_pepper', '');
        $hashedFp = hash('sha256', $fingerprint . $fpPepper);

        $payload = [
            'user_id' => $userId,
            'fingerPrint' => $hashedFp,
            'exp' => time() + $expiry,
            'iat' => time(),
            'iss' => 'Tripz-Wallet',
            'aud' => $audience
        ];

        return JWT::encode($payload, config('intaleq.wallet_jwt_secret'), 'HS256');
    }

    private function createJwt(string $userId, string $userType, string $fingerprint, int $expiry, string $audience = 'Tripz'): string
    {
        $payload = [
            'user_id' => $userId,
            'user_type' => $userType,
            'fingerprint' => $fingerprint,
            'iat' => time(),
            'exp' => time() + $expiry,
            'aud' => $audience,
            'jti' => Str::uuid()->toString(),
        ];

        return JWT::encode($payload, config('intaleq.jwt_secret'), 'HS256');
    }

    private function generateApiKeys($user): void
    {
        $apiKey = 'intq_' . Str::random(32);
        $apiSecret = hash('sha256', Str::random(64) . time());

        $user->update([
            'api_key' => $apiKey,
            'api_secret' => $apiSecret,
        ]);
    }

    /**
     * POST /v2/auth/passenger/login-jwt
     * Background handshake for passengers
     */
    public function passengerJwtHandshake(Request $request): JsonResponse
    {
        $request->validate([
            'id' => 'required|string',
            'password' => 'required|string',
            'fingerPrint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $audience = $request->input('aud');
        // Validate audience if needed (optional based on audio but good for security)
        // if (!in_array($audience, config('intaleq.allowed_audiences'))) { ... }

        // The user mentioned using a fixed password like 'passenger' from Flutter
        // and relying on fingerprint for security.
        
        // Generate a 24h JWT for the handshake (as requested to be consistent)
        $jwt = $this->createJwt(
            $request->input('id'), 
            'passenger', 
            $request->input('fingerPrint'), 
            86400, 
            $audience
        );

        return response()->json([
            'status' => 'success', 
            'jwt' => $jwt,
            'expires_in' => 86400
        ]);
    }

    /**
     * POST /v2/auth/driver/login-jwt
     * Background handshake for drivers
     */
    public function driverJwtHandshake(Request $request): JsonResponse
    {
        $request->validate([
            'id' => 'required|string',
            'password' => 'required|string',
            'fingerPrint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $jwt = $this->createJwt(
            $request->input('id'), 
            'driver', 
            $request->input('fingerPrint'), 
            86400, 
            $request->input('aud')
        );

        return response()->json([
            'status' => 'success', 
            'jwt' => $jwt,
            'expires_in' => 86400
        ]);
    }

    private function success(array $data, int $code = 200): JsonResponse
    {
        return response()->json(['status' => 'success', 'data' => $data], $code);
    }

    private function failure(string $message, int $code = 401): JsonResponse
    {
        return response()->json(['status' => 'failure', 'message' => $message], $code);
    }
}