<?php
/**
 * Export AJAX Handler
 * 
 * @package AllDataMigration
 * @subpackage Ajax
 */

if (!defined('ABSPATH')) {
    exit;
}

use AllDataMigration\Engine\ChunkConfig;
use AllDataMigration\Engine\ProgressState;
use AllDataMigration\Engine\ExportManager;

// Bu dosya AllDataMigration::handleExportAjax() tarafından include edilir

// phpcs:disable WordPress.Security.NonceVerification.Missing -- Nonce verified in parent handler (alldami-site-migration.php)
// phpcs:disable WordPress.NamingConventions.PrefixAllGlobals -- Standalone script variables
// phpcs:disable WordPress.Security.ValidatedSanitizedInput.MissingUnslash -- Sanitized below

// Nonce verified in parent handler AllDataMigration::handleExportAjax() via check_ajax_referer()
// PHP limits - scoped to this export operation only
if (function_exists('set_time_limit')) {
    set_time_limit(300); // phpcs:ignore Squiz.PHP.DiscouragedFunctions.Discouraged
}
if (function_exists('ini_set')) {
    ini_set('memory_limit', '512M'); // phpcs:ignore WordPress.PHP.IniSet.memory_limit_Blacklisted, Squiz.PHP.DiscouragedFunctions.Discouraged
}

$step = sanitize_text_field($_POST['step'] ?? 'init');
$jobId = sanitize_text_field($_POST['job_id'] ?? '');

try {
    $progress = new ProgressState();

    // Init adımı - yeni job başlat
    if ($step === 'init') {
        $config = new ChunkConfig(true); // Auto-detect enabled

        // Ayarlardan değerleri alıp config'i güncelle
        try {
            if (!class_exists('\\AllDataMigration\\Engine\\Settings')) {
                require_once ALLDAMI_PLUGIN_DIR . 'engine/Settings.php';
            }
            $settings = \AllDataMigration\Engine\Settings::getInstance();

            // DB Rows Limit (Yeni Eklenen Ayar)
            $dbRows = $settings->get('performance_db_rows', 3000);
            $config->setDbRowsPerChunk((int) $dbRows);

            // SQL Batch Size
            $sqlBatch = $settings->get('performance_sql_batch_size', 1000);
            $config->setSqlBatchSize((int) $sqlBatch);

            // Memory Limit
            $memoryLimit = $settings->get('performance_memory_limit');
            if ($memoryLimit) {
                // PHP ayarlarını override etmeye çalış
                @ini_set('memory_limit', $memoryLimit); // phpcs:ignore Squiz.PHP.DiscouragedFunctions.Discouraged
            }

        } catch (\Throwable $e) {
            // Ayarlar yüklenemezse varsayılanlarla devam et (Fatal errorları yakalar)
            // error_log('WP Cloner Settings Load Error: ' . $e->getMessage()); // Debug log removed for production
        }

        $jobId = $progress->init('export', $config);

        $exportManager = new ExportManager($progress);
        $result = $exportManager->initialize();

        wp_send_json_success([
            'job_id' => $jobId,
            'next_step' => $result['next_step'],
            'progress' => $progress->getProgress()
        ]);
    }

    // Devam eden job için yükle
    if (!$progress->load($jobId)) {
        wp_send_json_error(['message' => 'Geçersiz job ID.']);
    }

    $exportManager = new ExportManager($progress);

    // Adıma göre işlem yap
    switch ($step) {
        case 'analyze':
            $result = $exportManager->analyze();
            break;

        case 'db_export':
            $result = $exportManager->exportDbChunk();
            break;

        case 'file_archive':
            $result = $exportManager->archiveFilesChunk();
            break;

        case 'package':
            $result = $exportManager->createPackage();
            break;

        default:
            wp_send_json_error(['message' => 'Geçersiz adım: ' . $step]);
    }

    // Sonucu döndür
    if (isset($result['status']) && $result['status'] === 'completed') {
        wp_send_json_success([
            'status' => 'completed',
            'result' => $result['result'],
            'progress' => $progress->getProgress()
        ]);
    } else {
        wp_send_json_success([
            'job_id' => $jobId,
            'next_step' => $result['next_step'] ?? null,
            'progress' => $progress->getProgress()
        ]);
    }

} catch (\Throwable $e) {
    // Fatal Error yakalama (PHP 7+)
    if (isset($progress) && $progress instanceof ProgressState) {
        $progress->setError($e->getMessage());
    }

    // JSON formatında hata döndür
    if (!headers_sent()) {
        header('Content-Type: application/json');
        status_header(200); // 500 dönerse JS error callback tetiklenir, 200 dönüp success:false yapıyoruz
    }

    wp_send_json_error([
        'message' => 'Sistem Hatası: ' . $e->getMessage(),
        'debug' => [
            'file' => $e->getFile(),
            'line' => $e->getLine()
        ],
        'progress' => isset($progress) ? $progress->getProgress() : null
    ]);
}