<?php
/**
 * Settings - Plugin ayarlarını yöneten sınıf
 * 
 * @package AllDataMigration
 * @subpackage Engine
 */

namespace AllDataMigration\Engine;

if (!defined('ABSPATH')) {
    exit;
}

class Settings
{
    private static ?Settings $instance = null;
    private array $settings = [];
    private string $optionName = 'alldami_settings';

    /**
     * Varsayılan ayarlar
     */
    private array $defaults = [
        // Genel Ayarlar
        'general_language' => 'auto', // auto, tr_TR, en_US

        // Export Ayarları
        'export_min_disk_space' => 500, // MB
        'export_chunk_size' => 200, // dosya/chunk
        'export_max_zip_size' => 50, // MB
        'export_exclude_folders' => 'cache,backups,upgrade,wflogs',
        'export_exclude_tables' => '',

        // Import Ayarları
        'import_create_recovery_admin' => true,
        'import_recovery_admin_prefix' => 'wpc_admin_',
        'import_disable_plugins' => true,
        'import_skip_url_replace' => false,

        // Performans
        'performance_timeout' => 300, // saniye
        'performance_memory_limit' => '512M',
        'performance_sql_batch_size' => 1000,
        'performance_db_rows' => 1000, // Varsayılanı 1000'e çektik (Stabilite için)

        // Güvenlik
        'security_encrypt_export' => false,
        'security_auto_cleanup' => true,
        'security_required_role' => 'manage_options',
        'security_import_token_enabled' => true, // YENİ: Token doğrulama

        // Gelişmiş
        'advanced_debug_mode' => false, // YENİ: ReplaceEngine logging
        'advanced_paranoid_mode' => true, // YENİ: Agresif serialize skip
        'advanced_json_escape_slashes' => false, // YENİ: JSON'da \/ kullan

        // Bildirimler
        'notifications_email_enabled' => false,
        'notifications_email_address' => '',
        'notifications_slack_webhook' => '',
    ];

    private function __construct()
    {
        $this->load();
    }

    /**
     * Singleton instance döndürür
     */
    public static function getInstance(): Settings
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Ayarları veritabanından yükler
     */
    private function load(): void
    {
        $saved = get_option($this->optionName, []);
        $this->settings = array_merge($this->defaults, $saved);
    }

    /**
     * Tek bir ayarı döndürür
     */
    public function get(string $key, $default = null)
    {
        if (array_key_exists($key, $this->settings)) {
            return $this->settings[$key];
        }

        if ($default !== null) {
            return $default;
        }

        return $this->defaults[$key] ?? null;
    }

    /**
     * Tek bir ayarı günceller
     */
    public function set(string $key, $value): bool
    {
        $this->settings[$key] = $value;
        return $this->save();
    }

    /**
     * Birden fazla ayarı günceller
     */
    public function setMultiple(array $values): bool
    {
        foreach ($values as $key => $value) {
            if (array_key_exists($key, $this->defaults)) {
                $this->settings[$key] = $this->sanitize($key, $value);
            }
        }
        return $this->save();
    }

    /**
     * Tüm ayarları döndürür
     */
    public function getAll(): array
    {
        return $this->settings;
    }

    /**
     * Varsayılan ayarları döndürür
     */
    public function getDefaults(): array
    {
        return $this->defaults;
    }

    /**
     * Ayarları veritabanına kaydeder
     */
    private function save(): bool
    {
        return update_option($this->optionName, $this->settings);
    }

    /**
     * Ayarları varsayılana sıfırlar
     */
    public function reset(): bool
    {
        $this->settings = $this->defaults;
        return $this->save();
    }

    /**
     * Değeri temizler ve doğrular
     */
    private function sanitize(string $key, $value)
    {
        // Boolean alanlar
        $booleanFields = [
            'import_create_recovery_admin',
            'import_disable_plugins',
            'import_skip_url_replace',
            'security_encrypt_export',
            'security_auto_cleanup',
            'security_import_token_enabled',
            'advanced_debug_mode',
            'advanced_paranoid_mode',
            'advanced_json_escape_slashes',
            'notifications_email_enabled',
        ];

        if (in_array($key, $booleanFields)) {
            return filter_var($value, FILTER_VALIDATE_BOOLEAN);
        }

        // Sayısal alanlar
        $numericFields = [
            'export_min_disk_space',
            'export_chunk_size',
            'export_max_zip_size',
            'performance_timeout',
            'performance_sql_batch_size',
            'performance_db_rows',
        ];

        if (in_array($key, $numericFields)) {
            return absint($value);
        }

        // E-posta alanları
        if ($key === 'notifications_email_address') {
            return sanitize_email($value);
        }

        // URL alanları
        if ($key === 'notifications_slack_webhook') {
            return esc_url_raw($value);
        }

        // Diğer string alanlar
        return sanitize_text_field($value);
    }

    /**
     * Ayar gruplarını döndürür (UI için)
     */
    public function getSettingGroups(): array
    {
        return [
            'general' => [
                'title' => __('General', 'alldami-site-migration'),
                'icon' => 'dashicons-admin-generic',
                'fields' => [
                    'general_language' => [
                        'label' => __('Plugin Language', 'alldami-site-migration'),
                        'type' => 'select',
                        'options' => [
                            'auto' => __('Auto (WordPress Language)', 'alldami-site-migration'),
                            'tr_TR' => __('Turkish', 'alldami-site-migration'),
                            'en_US' => __('English', 'alldami-site-migration'),
                        ],
                        'description' => __('Language to be used for the plugin interface.', 'alldami-site-migration'),
                    ],
                ],
            ],
            'export' => [
                'title' => __('Export Settings', 'alldami-site-migration'),
                'icon' => 'dashicons-upload',
                'fields' => [
                    'export_min_disk_space' => [
                        'label' => __('Minimum Disk Space (MB)', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Minimum free disk space required before starting export.', 'alldami-site-migration'),
                    ],
                    'export_chunk_size' => [
                        'label' => __('Chunk Size', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Maximum number of files to add to each zip chunk.', 'alldami-site-migration'),
                    ],
                    'export_max_zip_size' => [
                        'label' => __('Max Zip Size (MB)', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Maximum size of a single zip file.', 'alldami-site-migration'),
                    ],
                    'export_exclude_folders' => [
                        'label' => __('Excluded Folders', 'alldami-site-migration'),
                        'type' => 'text',
                        'description' => __('Comma-separated folder names (e.g: cache,backups)', 'alldami-site-migration'),
                    ],
                    'export_exclude_tables' => [
                        'label' => __('Excluded Tables', 'alldami-site-migration'),
                        'type' => 'text',
                        'description' => __('Comma-separated table names (e.g: wp_statistics)', 'alldami-site-migration'),
                    ],
                ],
            ],
            'import' => [
                'title' => __('Import Settings', 'alldami-site-migration'),
                'icon' => 'dashicons-download',
                'fields' => [
                    'import_create_recovery_admin' => [
                        'label' => __('Create Recovery Admin', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Creates a new admin user after import.', 'alldami-site-migration'),
                    ],
                    'import_recovery_admin_prefix' => [
                        'label' => __('Admin User Prefix', 'alldami-site-migration'),
                        'type' => 'text',
                        'description' => __('Prefix of the admin user to be created.', 'alldami-site-migration'),
                    ],
                    'import_disable_plugins' => [
                        'label' => __('Disable All Plugins', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Deactivates all plugins after import.', 'alldami-site-migration'),
                    ],
                    'import_skip_url_replace' => [
                        'label' => __('Skip URL Replacement', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Does not perform URL replacement for debugging purposes.', 'alldami-site-migration'),
                    ],
                ],
            ],
            'performance' => [
                'title' => __('Performance', 'alldami-site-migration'),
                'icon' => 'dashicons-performance',
                'fields' => [
                    'performance_timeout' => [
                        'label' => __('PHP Timeout (seconds)', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Maximum duration per process.', 'alldami-site-migration'),
                    ],
                    'performance_memory_limit' => [
                        'label' => __('Memory Limit', 'alldami-site-migration'),
                        'type' => 'select',
                        'options' => [
                            '256M' => '256 MB',
                            '512M' => '512 MB',
                            '1G' => '1 GB',
                            '2G' => '2 GB',
                        ],
                        'description' => __('PHP memory limit.', 'alldami-site-migration'),
                    ],
                    'performance_sql_batch_size' => [
                        'label' => __('SQL Batch Size', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Number of rows to process at once.', 'alldami-site-migration'),
                    ],
                    'performance_db_rows' => [
                        'label' => __('DB Row Limit (Chunk)', 'alldami-site-migration'),
                        'type' => 'number',
                        'description' => __('Number of rows to fetch in each request. Higher values are faster but require more memory.', 'alldami-site-migration'),
                    ],
                ],
            ],
            'security' => [
                'title' => __('Security', 'alldami-site-migration'),
                'icon' => 'dashicons-shield',
                'fields' => [
                    'security_import_token_enabled' => [
                        'label' => __('Import Token Verification', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Checks the security token during import operations.', 'alldami-site-migration'),
                    ],
                    'security_encrypt_export' => [
                        'label' => __('Encrypt Export Files', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Protects ZIP files with a password. (Coming Soon)', 'alldami-site-migration'),
                        'disabled' => true,
                    ],
                    'security_auto_cleanup' => [
                        'label' => __('Automatic Temp Cleanup', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Automatically deletes temporary files after operation.', 'alldami-site-migration'),
                    ],
                    'security_required_role' => [
                        'label' => __('Required Role', 'alldami-site-migration'),
                        'type' => 'select',
                        'options' => [
                            'manage_options' => __('Administrator', 'alldami-site-migration'),
                            'edit_plugins' => __('Super Admin', 'alldami-site-migration'),
                        ],
                        'description' => __('Minimum capability required for Export/Import.', 'alldami-site-migration'),
                    ],
                ],
            ],
            'advanced' => [
                'title' => __('Advanced', 'alldami-site-migration'),
                'icon' => 'dashicons-admin-tools',
                'fields' => [
                    'advanced_debug_mode' => [
                        'label' => __('Debug Mode', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Logs ReplaceEngine operations. Enable only for testing.', 'alldami-site-migration'),
                    ],
                    'advanced_paranoid_mode' => [
                        'label' => __('Paranoid Mode', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Skips serialize-like strings. Safer but sometimes too protective.', 'alldami-site-migration'),
                    ],
                    'advanced_json_escape_slashes' => [
                        'label' => __('JSON Slash Escape', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Escapes the slash character (\\/) in JSON encode. Required for some plugins.', 'alldami-site-migration'),
                    ],
                ],
            ],
            'notifications' => [
                'title' => __('Notifications', 'alldami-site-migration'),
                'icon' => 'dashicons-bell',
                'fields' => [
                    'notifications_email_enabled' => [
                        'label' => __('Email Notification', 'alldami-site-migration'),
                        'type' => 'checkbox',
                        'description' => __('Sends an email when the process is complete.', 'alldami-site-migration'),
                    ],
                    'notifications_email_address' => [
                        'label' => __('Email Address', 'alldami-site-migration'),
                        'type' => 'email',
                        'description' => __('Email address to send notifications to.', 'alldami-site-migration'),
                    ],
                    'notifications_slack_webhook' => [
                        'label' => __('Slack Webhook URL', 'alldami-site-migration'),
                        'type' => 'url',
                        'description' => __('Slack notification webhook URL.', 'alldami-site-migration'),
                    ],
                ],
            ],
        ];
    }
}