<?php

declare(strict_types=1);

namespace App\Controllers;

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

class SubscriptionController
{
    /**
     * GET /api/v1/subscription/plans
     */
    public function getPlans(Request $request): void
    {
        $appConfig = require __DIR__ . '/../../config/app.php';

        $plans = [
            [
                'id' => 'uruk-2year-standard',
                'name' => 'عضوية جائزة أوروك التنفيذية (سنتان)',
                'duration_years' => 2,
                'price_usd' => (float)$appConfig['membership_price_usd'],
                'price_iqd' => (float)$appConfig['membership_price_iqd'],
                'benefits' => [
                    'خصم 50% في شبكة المستشفيات والمراكز التخصصية في العراق والأردن ومصر ولبنان',
                    'خصومات فندقية وسياحية تتراوح بين 40% و60% في أرقى الفنادق الشريكة',
                    'وصول مجاني لأكثر من 30 تخصصاً تدريبياً معتمداً حضورياً وعبر المنصة الرقمية',
                    'شهادات معتمدة ومسجلة رسمياً باسم المشترك',
                    'هوية رقمية ذكية مع رمز QR مشفر للتحقق الفوري',
                ],
                'official_activation_date' => '2026-01-01',
                'early_registration_active' => true,
            ],
        ];

        Response::success($plans, 'Available subscription plans retrieved.');
    }

    /**
     * POST /api/v1/subscription/submit
     * User submits payment details (Method, Ref Number, Receipt).
     */
    public function submitSubscription(Request $request): void
    {
        $userId = (int)$request->getHeader('x-user-id');
        $method = strtoupper(trim((string)$request->get('method', 'SUPER_QI')));
        $refNumber = trim((string)$request->get('reference_number'));
        $receiptUrl = trim((string)$request->get('receipt_url', ''));

        if (empty($refNumber)) {
            Response::error('Payment transaction reference number is required.');
        }

        $appConfig = require __DIR__ . '/../../config/app.php';
        $pdo = Database::getConnection();

        // 1. Generate unique membership number (e.g. URUK-2026-XXXX)
        $memNumber = 'URUK-' . date('Y') . '-' . strtoupper(substr(uniqid(), -5));
        $qrSeed = Security::generateRandomHex(16);

        $pdo->beginTransaction();
        try {
            // Create subscription record with PENDING_PAYMENT
            $subStmt = $pdo->prepare('
                INSERT INTO subscriptions (user_id, membership_number, plan_name, price_usd, price_local, currency, starts_at, expires_at, status, qr_seed, created_at)
                VALUES (:uid, :mem, "2-Year Executive Membership", :usd, :iqd, "IQD", CURDATE(), DATE_ADD(CURDATE(), INTERVAL 2 YEAR), "PENDING_PAYMENT", :seed, NOW())
            ');
            $subStmt->execute([
                ':uid' => $userId,
                ':mem' => $memNumber,
                ':usd' => $appConfig['membership_price_usd'],
                ':iqd' => $appConfig['membership_price_iqd'],
                ':seed' => $qrSeed,
            ]);
            $subscriptionId = (int)$pdo->lastInsertId();

            // Create transaction record
            $transStmt = $pdo->prepare('
                INSERT INTO transactions (subscription_id, user_id, method, reference_number, amount, currency, status, receipt_image_url, created_at)
                VALUES (:sub_id, :uid, :method, :ref, :amount, "IQD", "SUBMITTED", :receipt, NOW())
            ');
            $transStmt->execute([
                ':sub_id' => $subscriptionId,
                ':uid' => $userId,
                ':method' => $method,
                ':ref' => $refNumber,
                ':amount' => $appConfig['membership_price_iqd'],
                ':receipt' => $receiptUrl,
            ]);

            $pdo->commit();

            // 2. Check if a matching SuperQi / ZainCash notification was already ingested by the Android listener
            $checkStmt = $pdo->prepare('
                SELECT id, amount, status FROM transactions 
                WHERE reference_number = :ref AND id != :current_id AND status = "VERIFIED_AUTO"
                LIMIT 1
            ');
            $checkStmt->execute([':ref' => $refNumber, ':current_id' => (int)$pdo->lastInsertId()]);
            $preExistingPayment = $checkStmt->fetch(PDO::FETCH_ASSOC);

            if ($preExistingPayment) {
                // Instantly activate!
                $actSub = $pdo->prepare('UPDATE subscriptions SET status = "ACTIVE" WHERE id = :id');
                $actSub->execute([':id' => $subscriptionId]);

                $actTrans = $pdo->prepare('UPDATE transactions SET status = "VERIFIED_AUTO", verified_at = NOW() WHERE subscription_id = :id');
                $actTrans->execute([':id' => $subscriptionId]);

                Response::success([
                    'subscription_id' => $subscriptionId,
                    'membership_number' => $memNumber,
                    'status' => 'ACTIVE',
                    'message' => 'تم التحقق من الحوالة آلياً بنجاح وتفعيل العضوية فورياً!',
                ], 'Membership activated automatically via SuperQi verification.');
            }

            Response::success([
                'subscription_id' => $subscriptionId,
                'membership_number' => $memNumber,
                'status' => 'PENDING_PAYMENT',
                'message' => 'تم استلام طلبك بنجاح وجارٍ التحقق من الحوالة وتفعيل بطاقتك.',
            ], 'Subscription request registered. Verification in progress.');

        } catch (\Throwable $e) {
            $pdo->rollBack();
            Response::error('Failed to submit subscription: ' . $e->getMessage(), 500);
        }
    }

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

        $stmt = $pdo->prepare('
            SELECT s.id, s.membership_number, s.plan_name, s.status, s.starts_at, s.expires_at,
                   u.full_name, u.phone, u.avatar_url
            FROM subscriptions s
            JOIN users u ON u.id = s.user_id
            WHERE s.user_id = :uid
            ORDER BY s.id DESC
            LIMIT 1
        ');
        $stmt->execute([':uid' => $userId]);
        $card = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$card) {
            Response::notFound('No subscription card found for this user.');
        }

        Response::success($card, 'Digital card details retrieved.');
    }

    /**
     * GET /api/v1/subscription/savings-summary
     * Returns total cash saved, breakdown by partner type, loyalty tier, and recent savings logs.
     */
    public function getSavingsSummary(Request $request): void
    {
        $userId = (int)$request->getHeader('x-user-id');
        $pdo = Database::getConnection();

        // 1. Get totals
        $totStmt = $pdo->prepare('
            SELECT 
                COALESCE(SUM(saved_amount), 0) AS total_saved_iqd,
                COALESCE(SUM(paid_amount), 0) AS total_paid_iqd,
                COUNT(id) AS total_services_count
            FROM savings_ledger
            WHERE user_id = :uid
        ');
        $totStmt->execute([':uid' => $userId]);
        $totals = $totStmt->fetch(PDO::FETCH_ASSOC) ?: [
            'total_saved_iqd' => 0,
            'total_paid_iqd' => 0,
            'total_services_count' => 0,
        ];

        $totalSaved = (float)$totals['total_saved_iqd'];
        $servicesCount = (int)$totals['total_services_count'];

        // 2. Breakdown by partner type (HOSPITAL, HOTEL, TRAINING_CENTER)
        $breakdownStmt = $pdo->prepare('
            SELECT 
                p.type,
                COUNT(s.id) AS count,
                COALESCE(SUM(s.saved_amount), 0) AS saved_iqd
            FROM savings_ledger s
            JOIN partners p ON p.id = s.partner_id
            WHERE s.user_id = :uid
            GROUP BY p.type
        ');
        $breakdownStmt->execute([':uid' => $userId]);
        $breakdownRows = $breakdownStmt->fetchAll(PDO::FETCH_ASSOC);

        $breakdown = [
            'HOSPITAL' => ['count' => 0, 'saved_iqd' => 0.0, 'label' => 'المستشفيات والعيادات'],
            'HOTEL' => ['count' => 0, 'saved_iqd' => 0.0, 'label' => 'الفنادق والإقامة'],
            'TRAINING_CENTER' => ['count' => 0, 'saved_iqd' => 0.0, 'label' => 'الدورات والورش الأكاديمية'],
        ];

        foreach ($breakdownRows as $row) {
            $type = $row['type'];
            if (isset($breakdown[$type])) {
                $breakdown[$type]['count'] = (int)$row['count'];
                $breakdown[$type]['saved_iqd'] = (float)$row['saved_iqd'];
            }
        }

        // 3. Loyalty Tier Calculation (Gamification)
        if ($totalSaved >= 500000) {
            $tier = ['code' => 'DIAMOND', 'name_ar' => 'عضو ماسي أوروك', 'badge' => '💎', 'level' => 4];
        } elseif ($totalSaved >= 250000) {
            $tier = ['code' => 'GOLD', 'name_ar' => 'عضو ذهبي ممتاز', 'badge' => '🥇', 'level' => 3];
        } elseif ($totalSaved >= 100000) {
            $tier = ['code' => 'SILVER', 'name_ar' => 'عضو فضي متقدم', 'badge' => '🥈', 'level' => 2];
        } else {
            $tier = ['code' => 'BRONZE', 'name_ar' => 'عضو برونزي', 'badge' => '🥉', 'level' => 1];
        }

        // 4. Fetch last 10 logs
        $logsStmt = $pdo->prepare('
            SELECT s.id, s.service_name, s.original_amount, s.discount_percentage, s.saved_amount, s.paid_amount,
                   s.created_at, p.name_ar AS partner_name, p.type AS partner_type
            FROM savings_ledger s
            JOIN partners p ON p.id = s.partner_id
            WHERE s.user_id = :uid
            ORDER BY s.id DESC
            LIMIT 10
        ');
        $logsStmt->execute([':uid' => $userId]);
        $recentLogs = $logsStmt->fetchAll(PDO::FETCH_ASSOC);

        Response::success([
            'total_saved_iqd' => $totalSaved,
            'total_paid_iqd' => (float)$totals['total_paid_iqd'],
            'total_services_count' => $servicesCount,
            'breakdown' => $breakdown,
            'tier' => $tier,
            'recent_logs' => $recentLogs,
        ], 'Savings and gamification summary retrieved.');
    }
}