<?php

declare(strict_types=1);

namespace App\Controllers;

use Core\Request;
use Core\Response;
use Core\Security;
use Core\Database;
use App\Services\OtpIqService;
use PDO;

class AuthController
{
    /**
     * POST /api/v1/auth/request-otp
     */
    public function requestOtp(Request $request): void
    {
        $phone = trim((string)$request->get('phone'));
        if (empty($phone) || strlen($phone) < 8) {
            Response::error('Phone number is required.');
        }

        // Generate 6-digit cryptographic OTP code
        $otp = (string)random_int(100000, 999999);

        // Store OTP temporarily in DB or cache
        $pdo = Database::getConnection();
        $stmt = $pdo->prepare('
            INSERT INTO audit_logs (user_id, action, endpoint, method, ip_address, response_code, payload_snippet, created_at)
            VALUES (0, "OTP_REQUESTED", "/api/v1/auth/request-otp", "POST", :ip, 200, :payload, NOW())
        ');
        $stmt->execute([
            ':ip' => $request->getIp(),
            ':payload' => json_encode(['phone' => $phone, 'otp' => $otp]),
        ]);

        $otpService = new OtpIqService();
        $res = $otpService->sendOtp($phone, $otp);

        Response::success([
            'phone' => $phone,
            'channels' => ['whatsapp', 'sms'],
            'mock_otp' => getenv('APP_ENV') === 'development' ? $otp : null,
        ], 'Verification OTP dispatched via OTPIQ Smart Fallback.');
    }

    /**
     * POST /api/v1/auth/verify-otp
     * Receives phone, otp, device_fingerprint, device_model, and optional full_name.
     */
    public function verifyOtp(Request $request): void
    {
        $phone = trim((string)$request->get('phone'));
        $otp = trim((string)$request->get('otp'));
        $fingerprint = trim((string)$request->get('device_fingerprint'));
        $model = trim((string)$request->get('device_model', 'Unknown Device'));
        $fullName = trim((string)$request->get('full_name', 'عضو جائزة أوروك'));

        if (empty($phone) || empty($otp) || empty($fingerprint)) {
            Response::error('Phone, OTP, and Device Fingerprint are mandatory.');
        }

        $pdo = Database::getConnection();

        // Check or find user
        $stmt = $pdo->prepare('SELECT id, phone, full_name, role, status FROM users WHERE phone = :phone LIMIT 1');
        $stmt->execute([':phone' => $phone]);
        $user = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$user) {
            // Register new user
            $ins = $pdo->prepare('
                INSERT INTO users (phone, full_name, role, status, created_at)
                VALUES (:phone, :name, "MEMBER", "ACTIVE", NOW())
            ');
            $ins->execute([':phone' => $phone, ':name' => $fullName]);
            $userId = (int)$pdo->lastInsertId();
            $role = 'MEMBER';
        } else {
            $userId = (int)$user['id'];
            $role = $user['role'];
        }

        // Generate per-device secret key and session token
        $deviceSecret = Security::generateRandomHex(32);
        $sessionToken = Security::generateRandomHex(32);

        // Bind device fingerprint and store secret in user_security table
        $secStmt = $pdo->prepare('
            INSERT INTO user_security (user_id, device_fingerprint, device_secret, device_model, last_token, last_ip, last_active_at)
            VALUES (:uid, :fp, :secret, :model, :token, :ip, NOW())
            ON DUPLICATE KEY UPDATE 
                device_secret = VALUES(device_secret),
                device_model = VALUES(device_model),
                last_token = VALUES(last_token),
                last_ip = VALUES(last_ip),
                last_active_at = NOW(),
                is_locked = 0
        ');
        $secStmt->execute([
            ':uid' => $userId,
            ':fp' => $fingerprint,
            ':secret' => $deviceSecret,
            ':model' => $model,
            ':token' => $sessionToken,
            ':ip' => $request->getIp(),
        ]);

        Response::success([
            'user' => [
                'id' => $userId,
                'phone' => $phone,
                'full_name' => $user['full_name'] ?? $fullName,
                'role' => $role,
            ],
            'token' => $sessionToken,
            'device_secret' => $deviceSecret,
            'device_fingerprint' => $fingerprint,
        ], 'Authentication successful. Device bound and secured.');
    }

    /**
     * GET /api/v1/auth/profile
     */
    public function getProfile(Request $request): void
    {
        $userId = (int)$request->getHeader('x-user-id');
        $pdo = Database::getConnection();

        $stmt = $pdo->prepare('
            SELECT u.id, u.phone, u.full_name, u.role, u.status, u.created_at,
                   s.membership_number, s.status AS subscription_status, s.expires_at
            FROM users u
            LEFT JOIN subscriptions s ON s.user_id = u.id AND s.status = "ACTIVE"
            WHERE u.id = :uid
            ORDER BY s.id DESC
            LIMIT 1
        ');
        $stmt->execute([':uid' => $userId]);
        $profile = $stmt->fetch(PDO::FETCH_ASSOC);

        Response::success($profile, 'User profile retrieved.');
    }
}