<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;

/**
 * متحكم رموز التحقق (OTP Controller)
 * 
 * الغرض من الملف:
 * إدارة إرسال والتحقق من رموز الـ OTP (التي تصل عبر SMS أو البريد الإلكتروني) لضمان ملكية المستخدم للحساب.
 * 
 * كيفية العمل:
 * 1. يستقبل رقم الهاتف أو البريد الإلكتروني.
 * 2. يولد رمزاً عشوائياً ويرسله عبر الخدمة المناسبة.
 * 3. يخزن الرمز مؤقتاً للتحقق منه لاحقاً عند إدخاله من قبل المستخدم.
 */
class OtpController extends Controller
{
    /** POST /v2/otp/send */
    public function send(Request $request): JsonResponse
    {
        $request->validate(['phone' => 'required|string']);

        $phone = $request->input('phone');

        // Rate limit: 3 OTP per phone per 5 minutes
        $key = "otp_limit:{$phone}";
        if (Cache::get($key, 0) >= 3) {
            return response()->json(['status' => 'failure', 'message' => 'Too many OTP requests'], 429);
        }
        Cache::increment($key);
        Cache::put($key, Cache::get($key), 300);

        // Generate 6-digit OTP
        $otp = str_pad(random_int(0, 999999), 6, '0', STR_PAD_LEFT);
        $expiration = now()->addMinutes(5);

        // Store OTP
        DB::connection('primary')->table('phone_verification')->updateOrInsert(
            ['phone_number' => $phone],
            [
                'token_code' => password_hash($otp, PASSWORD_BCRYPT),
                'expiration_time' => $expiration,
                'is_verified' => 0,
                'created_at' => now(),
            ]
        );

        // TODO: Send SMS via external provider
        // For now, return success (SMS sending is provider-specific)

        return response()->json([
            'status' => 'success',
            'message' => 'OTP sent',
            'expires_at' => $expiration->toIso8601String(),
        ]);
    }

    /** POST /v2/otp/verify */
    public function verify(Request $request): JsonResponse
    {
        $request->validate([
            'phone' => 'required|string',
            'otp' => 'required|string|size:6',
        ]);

        $phone = $request->input('phone');
        $otp = $request->input('otp');

        $record = DB::connection('primary')->table('phone_verification')
            ->where('phone_number', $phone)
            ->where('is_verified', 0)
            ->where('expiration_time', '>', now())
            ->first();

        if (!$record) {
            return response()->json(['status' => 'failure', 'message' => 'OTP expired or not found'], 400);
        }

        // Verify OTP hash
        if (!password_verify($otp, $record->token_code)) {
            return response()->json(['status' => 'failure', 'message' => 'Invalid OTP'], 400);
        }

        // Mark as verified
        DB::connection('primary')->table('phone_verification')
            ->where('phone_number', $phone)
            ->update(['is_verified' => 1]);

        return response()->json(['status' => 'success', 'message' => 'Phone verified']);
    }

    /** POST /v2/otp/email/send */
    public function sendEmail(Request $request): JsonResponse
    {
        $request->validate(['email' => 'required|email']);

        $email = $request->input('email');
        $token = Str::random(32);

        DB::connection('primary')->table('email_verifications')->updateOrInsert(
            ['email' => $email],
            [
                'token' => password_hash($token, PASSWORD_BCRYPT),
                'verified' => 0,
                'created_at' => now(),
                'updated_at' => now(),
            ]
        );

        // TODO: Send email with token link

        return response()->json(['status' => 'success', 'message' => 'Verification email sent']);
    }

    /** POST /v2/otp/email/verify */
    public function verifyEmail(Request $request): JsonResponse
    {
        $request->validate([
            'email' => 'required|email',
            'token' => 'required|string',
        ]);

        $record = DB::connection('primary')->table('email_verifications')
            ->where('email', $request->input('email'))
            ->where('verified', 0)
            ->first();

        if (!$record || !password_verify($request->input('token'), $record->token)) {
            return response()->json(['status' => 'failure', 'message' => 'Invalid verification'], 400);
        }

        DB::connection('primary')->table('email_verifications')
            ->where('email', $request->input('email'))
            ->update(['verified' => 1, 'updated_at' => now()]);

        return response()->json(['status' => 'success', 'message' => 'Email verified']);
    }

    /** GET /v2/otp/check-phone?phone=XXX */
    public function checkPhone(Request $request): JsonResponse
    {
        $request->validate(['phone' => 'required|string']);

        $verified = DB::connection('primary')->table('phone_verification')
            ->where('phone_number', $request->input('phone'))
            ->where('is_verified', 1)
            ->exists();

        return response()->json([
            'status' => 'success',
            'data' => ['verified' => $verified],
        ]);
    }
}