<?php

// exdv/add endpoint
//$pdo = new PDO('mysql:host=87.249.36.139;dbname=argumentiru;charset=utf8mb4', 'argumentiru', 'hjYu78kl*90-Uio23');

// exdv/add endpoint
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

// ОБРАБОТКА OPTIONS ЗАПРОСА (preflight)
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
    http_response_code(200);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Получаем сырые JSON данные
    $jsonInput = file_get_contents('php://input');
    $input = json_decode($jsonInput, true);
    
    // Логируем для отладки
    error_log("Raw JSON input: " . $jsonInput);
    error_log("Decoded data: " . print_r($input, true));
    
    // Проверяем что JSON распарсился
    if (json_last_error() !== JSON_ERROR_NONE) {
        http_response_code(400);
        echo json_encode(['error' => 'Invalid JSON: ' . json_last_error_msg()]);
        exit;
    }
    
    // Валидация данных
    if (!isset($input['adv_id']) || !is_numeric($input['adv_id'])) {
        error_log("Ошибка: invalid adv_id");
        http_response_code(400);
        echo json_encode(['error' => 'Invalid adv_id', 'received_data' => $input]);
        exit;
    }
    
    // Подготовка данных
    $advId = (int)$input['adv_id'];
    $ipAddress = $_SERVER['HTTP_X_FORWARDED_FOR'] ?? $_SERVER['REMOTE_ADDR'] ?? 'unknown';
    $userAgent = $input['user_agent'] ?? '';
    $pageUrl = $input['page_url'] ?? '';
    $viewedAt = date('Y-m-d H:i:s');
    
    // Создаем хэш на основе adv_id, ip, user_agent и текущей минуты
    $minuteWindow = date('Y-m-d H:i');
    $hashData = $advId . $ipAddress . $userAgent . $minuteWindow;
    $viewHash = md5($hashData);
    
    try {
        $pdo = new PDO('mysql:host=87.249.36.139;dbname=argumentiru;charset=utf8mb4', 'argumentiru', 'hjYu78kl*90-Uio23');
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        
        // Проверяем существующий просмотр по хэшу
        $checkStmt = $pdo->prepare("SELECT view_id FROM `adv_views` WHERE view_hash = ? LIMIT 1");
        $checkStmt->execute([$viewHash]);
        
        if ($checkStmt->fetch()) {
            echo json_encode([
                'success' => true,
                'duplicate' => true,
                'message' => 'View already recorded in this minute'
            ]);
            exit;
        }
        
        // Сохраняем новый просмотр с хэшем
        $stmt = $pdo->prepare("INSERT INTO `adv_views` (`view_hash`, `adv_id`, `ip_address`, `user_agent`, `viewed_at`, `page_url`) VALUES (?, ?, ?, ?, ?, ?)");
        $stmt->execute([$viewHash, $advId, $ipAddress, $userAgent, $viewedAt, $pageUrl]);
        
        $viewId = $pdo->lastInsertId();
        
        http_response_code(200);

        echo json_encode([
            'success' => true,
            'view_id' => $viewId,
            'view_hash' => $viewHash,
            'message' => 'View recorded successfully'
        ]);
        
    } catch (PDOException $e) {
        http_response_code(500);
        error_log("Database error: " . $e->getMessage());
        echo json_encode(['error' => 'Database error: ' . $e->getMessage()]);
    }
    
} else {
    http_response_code(200);
    echo json_encode(['error' => 'Method not allowed']);
}
?>