<?php
/**
 * Uninstall AI RSS Rewriter
 *
 * Removes all plugin data when the plugin is deleted through WordPress admin.
 * This file is executed when the user deletes the plugin from the admin area.
 *
 * @package AI_RSS_Rewriter
 * @since 1.1
 */

// If uninstall not called from WordPress, exit
if (!defined('WP_UNINSTALL_PLUGIN')) {
    exit;
}

// Verify the uninstall is legitimate
if (!current_user_can('delete_plugins')) {
    exit;
}

/**
 * Remove all plugin options
 */
function airsrefe_remove_plugin_options() {
    $options_to_delete = array(
        // Core plugin options
        'arr_feeds',
        'arr_openai_key',
        'arr_cron_interval',
        'arr_cron_start_delay',
        'arr_log',
        'arr_logs',
        'arr_block_parsing',
        'arr_version',
        'arr_plugin_language',
        'arr_db_optimization_considered',
        
        // Processing settings
        'arr_processing_mode',
        'arr_generate_tags',
        'arr_image_source',
        'arr_cache_time',
        'arr_use_original_date',
        'arr_daily_parsing_limit',
        'arr_default_processing_level',
        
        // AI model settings
        'arr_model_content',
        'arr_model_title',
        'arr_model_tags',
        'arr_model_seo',
        'arr_model_fallback',
        'arr_smart_model_selection',
        'arr_content_length_threshold',
        'arr_enable_json_responses',
        'arr_api_timeout',
        'arr_exponential_backoff',
        'arr_max_retry_attempts',
        
        // Budget and cost settings
        'arr_daily_budget_limit',
        'arr_daily_costs',
        'arr_daily_budget_used',
        'arr_enable_budget_alerts',
        'arr_emergency_stop_enabled',
        'arr_batch_priority_mode',
        
        // Image settings
        'arr_optimize_images',
        'arr_image_format',
        'arr_image_compression_quality',
        'arr_max_image_width',
        'arr_max_image_height',
        'arr_image_size',
        'arr_image_quality',
        'arr_image_queue',
        
        // Content extraction settings
        'arr_extract_full_content',
        'arr_content_extraction_method',
        'arr_min_content_length',
        'arr_respect_robots_txt',
        'arr_blocked_extraction_domains',
        
        // Prompts and customization
        'arr_prompts',
        'arr_per_feed_ai_enabled',
        
        // Cron and background processing
        'arr_cron_last_scheduled',
        'arr_cron_interval_used',
        'arr_cron_status',
        'arr_auto_parse_lock',
        'arr_background_queue',
        'arr_processing_lock',
        
        // Statistics and caching
        'arr_stats_cache',
        'arr_cache_keys',
        'arr_today_parsed_count',
    );
    
    // Delete all plugin options
    foreach ($options_to_delete as $option) {
        delete_option($option);
        delete_site_option($option); // For multisite compatibility
    }
}

/**
 * Clear all scheduled cron events
 */
function airsrefe_clear_scheduled_events() {
    $cron_hooks = array(
        'arr_auto_parse_event',
        'arr_process_queue',
        'arr_background_processing',
        'arr_cleanup_logs',
        'arr_budget_check'
    );
    
    foreach ($cron_hooks as $hook) {
        wp_clear_scheduled_hook($hook);
    }
}

/**
 * Clean up transients and cached data
 */
function airsrefe_cleanup_transients() {
    // Get all transients related to this plugin
    $transient_patterns = array(
        '_transient_arr_%',
        '_transient_timeout_arr_%',
        '_transient_ai-rss-rewriter_%',
        '_transient_timeout_ai-rss-rewriter_%',
        '_transient_arr_processed_%',
        '_transient_arr_dashboard_%',
        '_transient_arr_feed_estimate_%',
        '_transient_arr_unoptimized_%',
        '_transient_arr_attachment_%',
        '_transient_arr_dup_%',
        '_transient_arr_processed_count_%',
        '_transient_arr_posts_today_%',
        '_transient_arr_posts_30d_%',
        '_transient_arr_today_parsed_count'
    );
    
    foreach ($transient_patterns as $pattern) {
        // Use WordPress API to find and delete transients
        $transients = array();
        
        // Get options with specific prefix using WordPress API
        $all_options = wp_load_alloptions();
        foreach ($all_options as $option_name => $option_value) {
            if (strpos($option_name, str_replace('%', '', $pattern)) === 0) {
                $transients[] = $option_name;
            }
        }
        
        foreach ($transients as $transient) {
            delete_option($transient);
        }
    }
    
    // Clear object cache groups
    if (function_exists('wp_cache_flush_group')) {
        wp_cache_flush_group('arr_plugin');
        wp_cache_flush_group('arr_daily_limits');
        wp_cache_flush_group('arr_duplicates');
        wp_cache_flush_group('arr_categories');
        wp_cache_flush_group('ai-rss-rewriter');
    }
    
    // Clear any remaining cache entries
    wp_cache_flush();
}

/**
 * Remove uploaded plugin files
 */
function airsrefe_remove_uploaded_files() {
    $upload_dir = wp_upload_dir();
    $plugin_upload_dir = $upload_dir['basedir'] . '/ai-rss-rewriter';
    
    if (file_exists($plugin_upload_dir)) {
        airsrefe_recursive_rmdir($plugin_upload_dir);
    }
}

/**
 * Recursively remove directory and all contents
 */
function airsrefe_recursive_rmdir($dir) {
    if (!is_dir($dir)) {
        return false;
    }
    
    $files = array_diff(scandir($dir), array('.', '..'));
    
    foreach ($files as $file) {
        $path = $dir . DIRECTORY_SEPARATOR . $file;
        if (is_dir($path)) {
            airsrefe_recursive_rmdir($path);
        } else {
            wp_delete_file($path);
        }
    }
    
    return wp_delete_file($dir);
}

/**
 * Clean up post meta data
 */
function airsrefe_cleanup_post_meta() {
    global $wpdb;
    
    $meta_keys = array(
        '_ai-rss-rewriter_processed_date',
        '_ai-rss-rewriter_source_url',
        '_ai-rss-rewriter_feed_url',
        '_ai-rss-rewriter_processing_mode',
        '_ai-rss-rewriter_processing_level',
        '_ai-rss-rewriter_priority',
        '_ai-rss-rewriter_date_mode',
        '_ai-rss-rewriter_generated',
        '_ai-rss-rewriter_source_post',
        '_ai-rss-rewriter_generated_date',
        '_ai-rss-rewriter_optimized',
        '_ai-rss-rewriter_final_format',
        '_ai-rss-rewriter_original_dimensions',
        '_ai-rss-rewriter_content_hash',
        '_ai-rss-rewriter_image_source',
        '_ai-rss-rewriter_image_optimized',
        'original_url', // Legacy meta key
        'rank_math_description',
        '_yoast_wpseo_metadesc',
        'rank_math_focus_keyword',
        '_yoast_wpseo_focuskw'
    );
    
    // Only remove meta data that was added by this plugin
    foreach ($meta_keys as $meta_key) {
        if (strpos($meta_key, '_ai-rss-rewriter_') === 0 || $meta_key === 'original_url') {
            // Use WordPress API instead of direct database query
            delete_metadata('post', 0, $meta_key, '', true);
        }
    }
    
    // Also clean up attachment meta data
    $attachment_meta_keys = array(
        '_ai-rss-rewriter_image_source',
        '_ai-rss-rewriter_image_optimized'
    );
    
    foreach ($attachment_meta_keys as $meta_key) {
        delete_metadata('post', 0, $meta_key, '', true);
    }
}

/**
 * Log the uninstallation (if logging is still available)
 */
function airsrefe_log_uninstall() {
    $log_entry = sprintf(
        '[%s] AI RSS Rewriter uninstalled - all data removed',
        current_time('mysql')
    );
    

}

// Execute uninstall procedures
try {
    // Log the uninstall attempt
    airsrefe_log_uninstall();
    
    // Remove all plugin options
    airsrefe_remove_plugin_options();
    
    // Clear scheduled events
    airsrefe_clear_scheduled_events();
    
    // Clean up transients and cache
    airsrefe_cleanup_transients();
    
    // Clean up post meta data
    airsrefe_cleanup_post_meta();
    
    // Remove uploaded files
    airsrefe_remove_uploaded_files();
    
    // Final cache flush
    wp_cache_flush();
    
    // Clear any remaining transients
    delete_transient('airsrefe_translations_cache');
    
} catch (Exception $e) {
    // Silent fail - don't show errors during uninstall
    // This prevents issues if some cleanup fails
}