@php
/**
 * Auto Translate - Google Translate Free API Integration
 * 
 * Receives rows with empty 'ceviri' field and translates 'icerik' to target 'dil'
 * Uses Google Translate unofficial free API endpoint
 * 
 * POST Parameters:
 * - rows: array of objects with {id, icerik, dil}
 * 
 * Returns JSON:
 * - success: boolean
 * - translated: array of {id, ceviri}
 * - errors: array of error messages
 */

header('Content-Type: application/json');

$rows = $request->input('rows', []);

if (empty($rows)) {
    echo json_encode([
        'success' => false,
        'message' => 'No rows provided',
        'translated' => [],
        'errors' => []
    ]);
    exit;
}

$translated = [];
$errors = [];

/**
 * Convert snake_case or technical format to readable sentence
 * Example: "paint_cycle" -> "Paint Cycle"
 * Example: "protocol_date_cleaning" -> "Protocol Date Cleaning"
 * 
 * @param string $text Input text (may contain underscores)
 * @return string Formatted readable text
 */
function formatToReadable($text) {
    // Replace underscores with spaces
    $text = str_replace('_', ' ', $text);
    
    // Replace multiple spaces with single space
    $text = preg_replace('/\s+/', ' ', $text);
    
    // Trim whitespace
    $text = trim($text);
    
    // Convert to title case (capitalize first letter of each word)
    $text = ucwords(strtolower($text));
    
    return $text;
}

/**
 * Check if text looks like a technical/column name
 * (contains underscores or is all lowercase with no spaces)
 * 
 * @param string $text Text to check
 * @return bool True if text appears to be technical format
 */
function isTechnicalFormat($text) {
    // Contains underscore
    if (strpos($text, '_') !== false) {
        return true;
    }
    
    // All lowercase with no spaces (like "paintcycle")
    if ($text === strtolower($text) && strpos($text, ' ') === false && strlen($text) > 3) {
        return true;
    }
    
    return false;
}

/**
 * Translate text using Google Translate Free API
 * 
 * @param string $text Source text to translate
 * @param string $targetLang Target language code (e.g., 'ru', 'tr')
 * @param string $sourceLang Source language code (default: 'en')
 * @return string|null Translated text or null on failure
 */
function googleTranslate($text, $targetLang, $sourceLang = 'en') {
    if (empty($text) || empty($targetLang)) {
        return null;
    }
    
    // Skip if source and target are the same
    if ($sourceLang === $targetLang) {
        return $text;
    }
    
    $url = 'https://translate.googleapis.com/translate_a/single';
    $params = [
        'client' => 'gtx',
        'sl' => $sourceLang,
        'tl' => $targetLang,
        'dt' => 't',
        'q' => $text
    ];
    
    $fullUrl = $url . '?' . http_build_query($params);
    
    // Use cURL for better control
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL => $fullUrl,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 10,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
        CURLOPT_HTTPHEADER => [
            'Accept: application/json',
            'Accept-Language: en-US,en;q=0.9'
        ]
    ]);
    
    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $curlError = curl_error($ch);
    curl_close($ch);
    
    if ($curlError || $httpCode !== 200) {
        return null;
    }
    
    // Parse response - Google returns nested array structure
    $data = json_decode($response, true);
    
    if (!$data || !isset($data[0])) {
        return null;
    }
    
    // Extract translated text from nested arrays
    $translatedText = '';
    foreach ($data[0] as $segment) {
        if (isset($segment[0])) {
            $translatedText .= $segment[0];
        }
    }
    
    return $translatedText ?: null;
}

// Process each row
foreach ($rows as $row) {
    $id = $row['id'] ?? null;
    $icerik = $row['icerik'] ?? '';
    $dil = $row['dil'] ?? '';
    
    if (!$id) {
        $errors[] = "Row missing ID";
        continue;
    }
    
    if (empty($icerik)) {
        $errors[] = "Row $id: Empty source text (icerik)";
        continue;
    }
    
    if (empty($dil)) {
        $errors[] = "Row $id: No target language specified";
        continue;
    }
    
    // Format technical text (snake_case) to readable format before translation
    $readableText = $icerik;
    if (isTechnicalFormat($icerik)) {
        $readableText = formatToReadable($icerik);
    }
    
    // Translate the formatted text
    $translatedText = googleTranslate($readableText, $dil, 'en');
    
    if ($translatedText === null) {
        $errors[] = "Row $id: Translation failed for '$icerik' to '$dil'";
        continue;
    }
    
    // Update the database
    try {
        db('translate')->where('id', $id)->update([
            'ceviri' => $translatedText,
            'updated_at' => now()
        ]);
        
        $translated[] = [
            'id' => $id,
            'ceviri' => $translatedText
        ];
    } catch (\Exception $e) {
        $errors[] = "Row $id: Database update failed - " . $e->getMessage();
    }
    
    // Small delay to avoid rate limiting
    usleep(100000); // 100ms delay between requests
}

echo json_encode([
    'success' => count($translated) > 0,
    'message' => count($translated) . ' rows translated successfully',
    'translated' => $translated,
    'errors' => $errors,
    'total_requested' => count($rows),
    'total_translated' => count($translated),
    'total_errors' => count($errors)
]);

@endphp