<?php

declare(strict_types=1);

namespace App\Controllers;

use Core\Request;
use Core\Response;
use Core\Database;
use PDO;

class AdminController
{
    /**
     * POST /api/v1/admin/partners/add
     * Directly add a new hospital or hotel contract on the fly.
     */
    public function addPartner(Request $request): void
    {
        $userId = (int)$request->getHeader('x-user-id');
        $type = strtoupper(trim((string)$request->get('type', 'HOSPITAL')));
        $nameAr = trim((string)$request->get('name_ar'));
        $nameEn = trim((string)$request->get('name_en', ''));
        $category = trim((string)$request->get('category', 'عام'));
        $country = trim((string)$request->get('country', 'العراق'));
        $city = trim((string)$request->get('city', 'بغداد'));
        $discount = (float)$request->get('discount_percentage', $type === 'HOSPITAL' ? 50.00 : 50.00);
        $phone = trim((string)$request->get('phone', ''));
        $address = trim((string)$request->get('address', ''));

        if (empty($nameAr)) {
            Response::error('Partner Arabic name is required.');
        }

        $pdo = Database::getConnection();
        $stmt = $pdo->prepare('
            INSERT INTO partners (type, name_ar, name_en, category, country, city, discount_percentage, address, phone, is_active, added_by_admin, created_at)
            VALUES (:type, :name_ar, :name_en, :category, :country, :city, :discount, :address, :phone, 1, :admin_id, NOW())
        ');
        $stmt->execute([
            ':type' => $type,
            ':name_ar' => $nameAr,
            ':name_en' => $nameEn,
            ':category' => $category,
            ':country' => $country,
            ':city' => $city,
            ':discount' => $discount,
            ':address' => $address,
            ':phone' => $phone,
            ':admin_id' => $userId,
        ]);

        $newId = (int)$pdo->lastInsertId();

        Response::success([
            'partner_id' => $newId,
            'name_ar' => $nameAr,
            'discount' => $discount,
            'message' => 'تمت إضافة الشريك بنجاح ومتاح فورياً لجميع المشتركين.',
        ], 'Partner created successfully.');
    }

    /**
     * GET /api/v1/admin/payments/pending
     */
    public function listPendingPayments(Request $request): void
    {
        $pdo = Database::getConnection();
        $stmt = $pdo->query('
            SELECT t.id, t.subscription_id, t.reference_number, t.amount, t.currency, t.method, t.receipt_image_url, t.created_at,
                   u.id AS user_id, u.full_name, u.phone, s.membership_number
            FROM transactions t
            JOIN subscriptions s ON s.id = t.subscription_id
            JOIN users u ON u.id = t.user_id
            WHERE t.status = "SUBMITTED"
            ORDER BY t.id DESC
            LIMIT 50
        ');
        $pending = $stmt->fetchAll(PDO::FETCH_ASSOC);

        Response::success($pending, 'Pending payments list retrieved.');
    }

    /**
     * POST /api/v1/admin/payments/approve
     */
    public function approvePayment(Request $request): void
    {
        $adminId = (int)$request->getHeader('x-user-id');
        $transactionId = (int)$request->get('transaction_id');

        $pdo = Database::getConnection();
        $pdo->beginTransaction();

        try {
            $stmt = $pdo->prepare('SELECT id, subscription_id, user_id FROM transactions WHERE id = :id LIMIT 1');
            $stmt->execute([':id' => $transactionId]);
            $trans = $stmt->fetch(PDO::FETCH_ASSOC);

            if (!$trans) {
                Response::notFound('Transaction not found.');
            }

            // Update transaction
            $updTrans = $pdo->prepare('UPDATE transactions SET status = "VERIFIED_ADMIN", verified_at = NOW() WHERE id = :id');
            $updTrans->execute([':id' => $transactionId]);

            // Activate subscription
            $updSub = $pdo->prepare('
                UPDATE subscriptions 
                SET status = "ACTIVE", starts_at = CURDATE(), expires_at = DATE_ADD(CURDATE(), INTERVAL 2 YEAR), activated_by = :admin_id
                WHERE id = :sub_id
            ');
            $updSub->execute([
                ':admin_id' => $adminId,
                ':sub_id' => $trans['subscription_id'],
            ]);

            // Activate user
            $updUser = $pdo->prepare('UPDATE users SET status = "ACTIVE" WHERE id = :uid');
            $updUser->execute([':uid' => $trans['user_id']]);

            $pdo->commit();

            Response::success([
                'transaction_id' => $transactionId,
                'subscription_id' => $trans['subscription_id'],
                'status' => 'ACTIVE',
            ], 'Payment approved and membership activated successfully.');

        } catch (\Throwable $e) {
            $pdo->rollBack();
            Response::error('Approval failed: ' . $e->getMessage(), 500);
        }
    }

    /**
     * GET /api/v1/admin/stats
     */
    public function getStats(Request $request): void
    {
        $pdo = Database::getConnection();

        $membersCount = (int)$pdo->query('SELECT COUNT(*) FROM subscriptions WHERE status = "ACTIVE"')->fetchColumn();
        $pendingCount = (int)$pdo->query('SELECT COUNT(*) FROM subscriptions WHERE status = "PENDING_PAYMENT"')->fetchColumn();
        $totalRevenue = (float)$pdo->query('SELECT COALESCE(SUM(amount), 0) FROM transactions WHERE status IN ("VERIFIED_AUTO", "VERIFIED_ADMIN")')->fetchColumn();
        $hospitalsCount = (int)$pdo->query('SELECT COUNT(*) FROM partners WHERE type = "HOSPITAL" AND is_active = 1')->fetchColumn();
        $hotelsCount = (int)$pdo->query('SELECT COUNT(*) FROM partners WHERE type = "HOTEL" AND is_active = 1')->fetchColumn();

        Response::success([
            'active_members' => $membersCount,
            'pending_verifications' => $pendingCount,
            'total_revenue_iqd' => $totalRevenue,
            'total_revenue_usd' => round($totalRevenue / 1320, 2),
            'active_hospitals' => $hospitalsCount,
            'active_hotels' => $hotelsCount,
        ], 'System statistics retrieved.');
    }
}