<?php

namespace App\Http\Controllers;

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

class AuthController extends Controller
{
    protected $encryption;

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

    // ══════════════════════════════════════════════
    // PASSENGER LOGIN & REGISTRATION
    // ══════════════════════════════════════════════

    /**
     * POST /v2/auth/passenger/login
     * Replaces: loginJwtPassenger.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));

        // Flexible phone lookup (encrypted/raw, international/local)
        $rawPhone = $phone;
        $localPhone = '0' . substr($phone, 3);
        $encRawPhone = $this->encryption->encrypt($rawPhone);
        $encLocalPhone = $this->encryption->encrypt($localPhone);

        $passenger = Passenger::active()
            ->whereIn('phone', [$rawPhone, $localPhone, $encRawPhone, $encLocalPhone])
            ->first();

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

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

        // Verify fingerprint
        $passengerToken = PassengerToken::where('passengerID', $passenger->id)->first();
        if ($passengerToken && $passengerToken->fingerPrint !== $fingerprint) {
            return $this->failure('Device mismatch');
        }

        // Update FCM token
        $encryptedFcm = $this->encryption->encrypt($fcmToken);
        if ($passengerToken) {
            $passengerToken->update([
                'token' => $encryptedFcm,
                'fingerPrint' => $fingerprint,
            ]);
        } else {
            PassengerToken::create([
                'token' => $encryptedFcm,
                'passengerID' => $passenger->id,
                'fingerPrint' => $fingerprint,
            ]);
        }

        // Generate API keys if missing
        if (empty($passenger->api_key)) {
            $this->generateApiKeys($passenger);
        }

        $jwt = $this->createJwt($passenger->id, 'passenger', $fingerprint, 86400);

        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',
            'first_name' => 'required|string',
            'last_name' => 'required|string',
            'password' => 'nullable|string|min:6',
            'gender' => 'nullable|string',
            'birthdate' => 'nullable|string',
            'site' => 'nullable|string',
            'fingerprint' => 'nullable|string',
            'fcm_token' => 'nullable|string',
        ]);

        $phone = $request->input('phone');
        $password = $request->input('password', Str::random(12));
        $gender = $request->input('gender', 'not_specified');
        $birthdate = $request->input('birthdate', '2000-01-01');
        $site = $request->input('site', 'none');
        $fingerprint = $request->input('fingerprint', 'unknown');
        $fcmToken = $request->input('fcm_token', 'none');

        $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($password, PASSWORD_BCRYPT),
            'first_name' => $this->encryption->encrypt($request->input('first_name')),
            'last_name' => $this->encryption->encrypt($request->input('last_name')),
            'gender' => $this->encryption->encrypt($gender),
            'birthdate' => $this->encryption->encrypt($birthdate),
            'site' => $site,
        ]);

        // Create FCM token record if provided
        if ($fcmToken !== 'none') {
            PassengerToken::create([
                'token' => $this->encryption->encrypt($fcmToken),
                'passengerID' => $passengerId,
                'fingerPrint' => $fingerprint,
            ]);
        }

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

        // Generate 24h JWT for immediate use after registration
        $jwt = $this->createJwt($passengerId, 'passenger', $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
     */
    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');
        $encryptedPhone = $this->encryption->encrypt($phone);

        $driver = Driver::active()->where('phone', $encryptedPhone)->first();
        if (!$driver) {
            return $this->failure('Invalid credentials');
        }

        if (!password_verify($request->input('password'), $driver->password) &&
            !hash_equals($driver->password, hash_hmac('sha256', $request->input('password'), config('intaleq.jwt_secret')))) {
            return $this->failure('Invalid credentials');
        }

        $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,
        ]);
    }

    // ══════════════════════════════════════════════
    // WALLET LOGIN
    // ══════════════════════════════════════════════

    public function passengerWalletLogin(Request $request): JsonResponse
    {
        if (!$request->has('fingerprint') && $request->has('fingerPrint')) {
            $request->merge(['fingerprint' => $request->input('fingerPrint')]);
        }

        $request->validate([
            'id' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $secret = config('intaleq.jwt_secret');
        $jwt = $this->createWalletJwt($request->input('id'), $request->input('fingerprint'), $request->input('aud'), 300, $secret);
        $hmac = hash_hmac('sha256', $request->input('id'), config('intaleq.wallet_hmac_secret'));

        return $this->success([
            'jwt' => $jwt,
            'hmac' => $hmac,
            'expires_in' => 300,
        ]);
    }

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

    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 (!$admin || !password_verify($request->input('password'), $admin->password ?? '')) {
            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,
        ]);
    }

    public function adminWalletLogin(Request $request): JsonResponse
    {
        $request->validate([
            'id' => 'required|string',
            'password' => 'required|string',
            'fingerprint' => 'required|string',
            'aud' => 'required|string',
        ]);

        $admin = DB::connection('primary')->table('adminUser')->where('id', $request->input('id'))->first();
        if (!$admin) return $this->failure('Not found');

        $jwt = $this->createWalletJwt((string)$admin->id, $request->input('fingerprint'), $request->input('aud'), 60);
        $hmac = hash_hmac('sha256', (string)$admin->id, config('intaleq.wallet_hmac_secret'));

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

    // ══════════════════════════════════════════════
    // GOOGLE LOGIN (Legacy V1 Compatibility)
    // ══════════════════════════════════════════════

    public function passengerLoginGoogle(Request $request): JsonResponse
    {
        $request->validate([
            'email' => 'required|string',
            'id' => 'required|string',
        ]);

        $email = $request->input('email');
        $id = $request->input('id');

        // Check if email is already encrypted (contains non-alphanumeric chars usually)
        $searchEmail = (str_contains($email, '+') || str_contains($email, '/')) ? $email : $this->encryption->encrypt($email);

        $row = DB::connection('primary')
            ->table('passengers as p')
            ->leftJoin('phone_verification_passenger', 'phone_verification_passenger.phone_number', '=', 'p.phone')
            ->leftJoin('invitesToPassengers', 'invitesToPassengers.inviterPassengerPhone', '=', 'p.phone')
            ->leftJoin('promos', 'promos.passengerID', '=', 'p.id')
            ->select([
                'p.id', 'p.phone', 'p.email', 'p.gender', 'p.status',
                'p.birthdate', 'p.site', 'p.first_name', 'p.last_name',
                'p.sosPhone', 'p.education', 'p.employmentType', 'p.maritalStatus',
                'p.created_at', 'p.updated_at',
                'phone_verification_passenger.verified',
                'invitesToPassengers.isInstall',
                'invitesToPassengers.inviteCode',
                'invitesToPassengers.isGiftToken',
                'promos.promo_code as promo',
                'promos.amount as discount',
                'promos.validity_end_date as validity',
                'p.api_key',
                'p.api_secret',
            ])
            ->where('p.email', $searchEmail)
            ->where('p.id', $id)
            ->first();

        if (!$row) {
            return response()->json(['status' => 'Failure', 'data' => 'User does not exist.']);
        }

        // Decrypt all fields for Flutter
        $data = (array) $row;
        foreach ($data as $key => $value) {
            if (is_string($value) && !in_array($key, ['id', 'status', 'created_at', 'updated_at', 'verified', 'isInstall', 'isGiftToken', 'api_key', 'api_secret'])) {
                $dec = $this->encryption->decrypt($value);
                if ($dec) $data[$key] = $dec;
            }
        }

        // Flutter expects data as a List
        return response()->json([
            'status' => 'success',
            'count' => 1,
            'data' => [$data],
        ]);
    }

    // ══════════════════════════════════════════════
    // JWT HELPERS
    // ══════════════════════════════════════════════

    private function createJwt(string $userId, string $userType, string $fingerprint, int $expiry, ?string $audience = null): string
    {
        $payload = [
            'user_id' => $userId,
            'user_type' => $userType,
            'fingerprint' => $fingerprint,
            'iat' => time(),
            'exp' => time() + $expiry,
            'aud' => $audience ?? 'mobile-app',
            'iss' => 'Tripz',
            'jti' => bin2hex(random_bytes(16)),
        ];

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

    private function createWalletJwt(string $userId, string $fingerprint, string $audience, int $expiry = 300, ?string $secret = null): string
    {
        $payload = [
            'user_id' => $userId,
            'fingerPrint' => hash('sha256', $fingerprint . config('intaleq.fp_pepper', '')),
            'exp' => time() + $expiry,
            'iat' => time(),
            'iss' => 'Tripz-Wallet',
            'aud' => $audience,
            'jti' => bin2hex(random_bytes(16)),
        ];

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

    private function generateApiKeys($model)
    {
        $model->api_key = bin2hex(random_bytes(16));
        $model->api_secret = bin2hex(random_bytes(32));
        DB::connection('primary')->table($model->getTable())
            ->where('idn', $model->idn ?? $model->id)
            ->update([
                'api_key' => $model->api_key,
                'api_secret' => $model->api_secret
            ]);
    }
}