// Install theme from WordPress.org
function install_theme_from_wordpress_org($theme_slug) {
    include_once(ABSPATH . 'wp-admin/includes/class-wp-upgrader.php');
    include_once(ABSPATH . 'wp-admin/includes/theme.php');

    $upgrader = new Theme_Upgrader();
    $result = $upgrader->install($theme_slug);

    if (is_wp_error($result)) {
        return $result->get_error_message();
    }

    // Activate the theme
    switch_theme($theme_slug);

    return "Theme '{$theme_slug}' installed and activated successfully";
}

// Upload and install custom theme
function upload_custom_theme($zip_file_path) {
    if (!file_exists($zip_file_path)) {
        return 'Theme zip file not found';
    }

    include_once(ABSPATH . 'wp-admin/includes/file.php');
    include_once(ABSPATH . 'wp-admin/includes/class-wp-upgrader.php');

    WP_Filesystem();

    $upgrader = new Theme_Upgrader();
    $result = $upgrader->install($zip_file_path);

    if (is_wp_error($result)) {
        return $result->get_error_message();
    }

    // Clean up uploaded file
    unlink($zip_file_path);

    return 'Custom theme uploaded and installed successfully';
}

// Safely switch themes with fallback
function safe_theme_switch($new_theme) {
    $current_theme = wp_get_theme();

    // Create backup of current theme options
    $theme_options_backup = get_option('theme_mods_' . $current_theme->get_stylesheet());

    try {
        // Switch to new theme
        switch_theme($new_theme);

        // Verify theme switched successfully
        $active_theme = wp_get_theme();
        if ($active_theme->get_stylesheet() !== $new_theme) {
            throw new Exception('Theme switch failed');
        }

        // Log successful switch
        error_log("Theme switched from {$current_theme->get_stylesheet()} to {$new_theme}");

        return true;

    } catch (Exception $e) {
        // Restore previous theme if switch failed
        switch_theme($current_theme->get_stylesheet());

        // Log error
        error_log("Theme switch failed: " . $e->getMessage());

        return false;
    }
}

// Preview theme before switching
function preview_theme($theme_slug) {
    // Set theme preview
    set_theme_preview($theme_slug);

    // Generate preview URL
    $preview_url = add_query_arg(array(
        'theme_preview' => $theme_slug,
        'preview_nonce' => wp_create_nonce('theme_preview_' . $theme_slug)
    ), home_url());

    return $preview_url;
}

// Install multiple plugins at once
function bulk_install_plugins($plugin_slugs) {
    $installed = array();
    $failed = array();

    foreach ($plugin_slugs as $slug) {
        $result = install_plugin_from_wordpress_org($slug);

        if (is_wp_error($result)) {
            $failed[$slug] = $result->get_error_message();
        } else {
            $installed[] = $slug;
        }

        // Small delay to prevent overwhelming the server
        sleep(1);
    }

    return array(
        'installed' => $installed,
        'failed' => $failed
    );
}

function install_plugin_from_wordpress_org($plugin_slug) {
    include_once(ABSPATH . 'wp-admin/includes/plugin-install.php');
    include_once(ABSPATH . 'wp-admin/includes/class-wp-upgrader.php');

    $api = plugins_api('plugin_information', array(
        'slug' => $plugin_slug,
        'fields' => array('sections' => false)
    ));

    if (is_wp_error($api)) {
        return $api;
    }

    $upgrader = new Plugin_Upgrader();
    $result = $upgrader->install($api->download_link);

    return $result;
}

// Smart plugin activation with dependency checking
function smart_plugin_activation($plugin_file) {
    // Check if plugin exists
    if (!file_exists(WP_PLUGIN_DIR . '/' . $plugin_file)) {
        return new WP_Error('plugin_not_found', 'Plugin file not found');
    }

    // Check plugin requirements
    $plugin_data = get_plugin_data(WP_PLUGIN_DIR . '/' . $plugin_file);

    // Check WordPress version compatibility
    if (isset($plugin_data['RequiresWP']) &&
        version_compare(get_bloginfo('version'), $plugin_data['RequiresWP'], '<')) {
        return new WP_Error('wp_version_incompatible', 'Plugin requires newer WordPress version');
    }

    // Check PHP version compatibility
    if (isset($plugin_data['RequiresPHP']) &&
        version_compare(PHP_VERSION, $plugin_data['RequiresPHP'], '<')) {
        return new WP_Error('php_version_incompatible', 'Plugin requires newer PHP version');
    }

    // Activate plugin
    $result = activate_plugin($plugin_file);

    if (is_wp_error($result)) {
        return $result;
    }

    // Run plugin activation hook if it exists
    do_action('plugin_activated_' . $plugin_file);

    return true;
}

// Bulk plugin activation/deactivation
function bulk_plugin_operations($plugins, $action = 'activate') {
    $results = array('success' => array(), 'failed' => array());

    foreach ($plugins as $plugin) {
        if ($action === 'activate') {
            $result = activate_plugin($plugin);
        } elseif ($action === 'deactivate') {
            $result = deactivate_plugins($plugin);
        }

        if (is_wp_error($result)) {
            $results['failed'][$plugin] = $result->get_error_message();
        } else {
            $results['success'][] = $plugin;
        }
    }

    return $results;
}

// Comprehensive theme health check
function theme_health_check($theme_slug) {
    $theme = wp_get_theme($theme_slug);
    $health_score = 100;
    $issues = array();

    // Check theme update status
    $updates = get_theme_updates();
    if (isset($updates[$theme_slug])) {
        $issues[] = 'Theme update available';
        $health_score -= 20;
    }

    // Check theme files integrity
    $theme_files = $theme->get_files();
    foreach ($theme_files as $file) {
        if (!file_exists($theme->get_stylesheet_directory() . '/' . $file)) {
            $issues[] = "Missing file: {$file}";
            $health_score -= 10;
        }
    }

    // Check theme PHP compatibility
    $php_files = glob($theme->get_stylesheet_directory() . '/*.php');
    foreach ($php_files as $php_file) {
        $syntax_check = check_php_syntax($php_file);
        if (!$syntax_check['valid']) {
            $issues[] = "PHP syntax error in {$php_file}: {$syntax_check['error']}";
            $health_score -= 15;
        }
    }

    return array(
        'score' => max(0, $health_score),
        'issues' => $issues,
        'recommendations' => generate_theme_recommendations($issues)
    );
}

function check_php_syntax($file_path) {
    $output = shell_exec("php -l \"{$file_path}\" 2>&1");
    $lines = explode("\n", trim($output));

    if (strpos($lines[0], 'No syntax errors detected') === 0) {
        return array('valid' => true);
    } else {
        return array('valid' => false, 'error' => $lines[0]);
    }
}

// Plugin performance and health monitoring
function plugin_health_check($plugin_file) {
    $plugin_data = get_plugin_data(WP_PLUGIN_DIR . '/' . $plugin_file);
    $health_score = 100;
    $issues = array();

    // Check plugin activation status
    if (!is_plugin_active($plugin_file)) {
        $issues[] = 'Plugin is deactivated';
        $health_score -= 5;
    }

    // Check for updates
    $updates = get_plugin_updates();
    if (isset($updates[$plugin_file])) {
        $issues[] = 'Plugin update available';
        $health_score -= 20;
    }

    // Check plugin size (large plugins may impact performance)
    $plugin_size = get_plugin_size($plugin_file);
    if ($plugin_size > 10 * 1024 * 1024) { // 10MB
        $issues[] = 'Plugin is very large (>10MB)';
        $health_score -= 10;
    }

    // Check plugin age (very old plugins may be insecure)
    $last_updated = strtotime($plugin_data['LastUpdated'] ?? '2020-01-01');
    $six_months_ago = strtotime('-6 months');

    if ($last_updated < $six_months_ago) {
        $issues[] = 'Plugin hasn\'t been updated in over 6 months';
        $health_score -= 15;
    }

    // Check for known vulnerabilities
    $vulnerabilities = check_plugin_vulnerabilities($plugin_file);
    if (!empty($vulnerabilities)) {
        $issues = array_merge($issues, $vulnerabilities);
        $health_score -= 25;
    }

    return array(
        'score' => max(0, $health_score),
        'issues' => $issues,
        'data' => $plugin_data
    );
}

function get_plugin_size($plugin_file) {
    $plugin_path = WP_PLUGIN_DIR . '/' . dirname($plugin_file);
    $size = 0;

    $iterator = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($plugin_path, RecursiveDirectoryIterator::SKIP_DOTS)
    );

    foreach ($iterator as $file) {
        if ($file->isFile()) {
            $size += $file->getSize();
        }
    }

    return $size;
}

// Optimize theme assets
function optimize_theme_assets($theme_slug) {
    $theme = wp_get_theme($theme_slug);
    $theme_dir = $theme->get_stylesheet_directory();

    // Minify CSS files
    $css_files = glob($theme_dir . '/*.css');
    foreach ($css_files as $css_file) {
        $minified = minify_css(file_get_contents($css_file));
        file_put_contents(str_replace('.css', '.min.css', $css_file), $minified);
    }

    // Minify JavaScript files
    $js_files = glob($theme_dir . '/*.js');
    foreach ($js_files as $js_file) {
        $minified = minify_js(file_get_contents($js_file));
        file_put_contents(str_replace('.js', '.min.js', $js_file), $minified);
    }

    // Optimize images
    optimize_theme_images($theme_dir);

    return 'Theme assets optimized successfully';
}

function optimize_theme_images($theme_dir) {
    $image_extensions = array('jpg', 'jpeg', 'png', 'gif', 'webp');
    $image_files = array();

    foreach ($image_extensions as $ext) {
        $image_files = array_merge($image_files, glob($theme_dir . '/*.' . $ext));
        $image_files = array_merge($image_files, glob($theme_dir . '/**/*.' . $ext));
    }

    foreach ($image_files as $image_file) {
        // Use WordPress image optimization functions
        $attachment_id = attachment_url_to_postid($image_file);
        if ($attachment_id) {
            // Regenerate thumbnails with optimization
            $metadata = wp_generate_attachment_metadata($attachment_id, $image_file);
            wp_update_attachment_metadata($attachment_id, $metadata);
        }
    }
}

// Optimize plugin database usage
function optimize_plugin_database($plugin_slug) {
    global $wpdb;

    // Get plugin-specific tables
    $plugin_tables = get_plugin_tables($plugin_slug);

    foreach ($plugin_tables as $table) {
        // Optimize table
        $wpdb->query("OPTIMIZE TABLE {$table}");

        // Repair if needed
        $wpdb->query("REPAIR TABLE {$table}");

        // Remove orphaned data
        clean_plugin_orphaned_data($table, $plugin_slug);
    }

    return 'Plugin database optimized';
}

function get_plugin_tables($plugin_slug) {
    global $wpdb;

    $tables = array();
    $all_tables = $wpdb->get_col('SHOW TABLES');

    foreach ($all_tables as $table) {
        // Check if table belongs to plugin (this is a simplified check)
        if (strpos($table, $plugin_slug) !== false ||
            strpos($table, str_replace('-', '_', $plugin_slug)) !== false) {
            $tables[] = $table;
        }
    }

    return $tables;
}

function clean_plugin_orphaned_data($table, $plugin_slug) {
    global $wpdb;

    // Example: Clean orphaned post meta for a hypothetical plugin
    if ($table === $wpdb->prefix . 'plugin_custom_meta') {
        $wpdb->query("
            DELETE pm FROM {$table} pm
            LEFT JOIN {$wpdb->posts} p ON p.ID = pm.post_id
            WHERE p.ID IS NULL
        ");
    }
}

// Bulk theme operations
function bulk_theme_operations($themes, $operation) {
    $results = array('success' => array(), 'failed' => array());

    foreach ($themes as $theme_slug) {
        switch ($operation) {
            case 'activate':
                $result = switch_theme($theme_slug);
                break;
            case 'delete':
                $result = delete_theme($theme_slug);
                break;
            case 'update':
                $result = wp_update_theme($theme_slug);
                break;
            default:
                $result = new WP_Error('invalid_operation', 'Invalid operation');
        }

        if (is_wp_error($result)) {
            $results['failed'][$theme_slug] = $result->get_error_message();
        } else {
            $results['success'][] = $theme_slug;
        }
    }

    return $results;
}

// Safe theme deletion with backup
function safe_delete_theme($theme_slug) {
    // Don't delete active theme
    $active_theme = wp_get_theme();
    if ($active_theme->get_stylesheet() === $theme_slug) {
        return new WP_Error('active_theme', 'Cannot delete active theme');
    }

    // Don't delete default themes
    $default_themes = array('twentytwentyfour', 'twentytwentythree', 'twentytwentytwo');
    if (in_array($theme_slug, $default_themes)) {
        return new WP_Error('default_theme', 'Cannot delete default theme');
    }

    // Create backup before deletion
    $theme = wp_get_theme($theme_slug);
    $backup_path = backup_theme_files($theme);

    // Delete theme
    $result = delete_theme($theme_slug);

    if (is_wp_error($result)) {
        // Restore from backup if deletion failed
        restore_theme_backup($backup_path);
        return $result;
    }

    return array('deleted' => true, 'backup_path' => $backup_path);
}

// Advanced bulk plugin management
function advanced_bulk_plugin_management($plugins, $operations) {
    $results = array();

    foreach ($operations as $operation => $config) {
        $results[$operation] = array('success' => array(), 'failed' => array());

        foreach ($plugins as $plugin) {
            $result = perform_plugin_operation($plugin, $operation, $config);

            if (is_wp_error($result)) {
                $results[$operation]['failed'][$plugin] = $result->get_error_message();
            } else {
                $results[$operation]['success'][] = $plugin;
            }
        }
    }

    return $results;
}

function perform_plugin_operation($plugin, $operation, $config) {
    switch ($operation) {
        case 'activate':
            return activate_plugin($plugin);

        case 'deactivate':
            return deactivate_plugins($plugin);

        case 'delete':
            // Safe deletion with checks
            if (!is_plugin_active($plugin)) {
                return delete_plugins(array($plugin));
            } else {
                return new WP_Error('active_plugin', 'Cannot delete active plugin');
            }

        case 'update':
            $updates = get_plugin_updates();
            if (isset($updates[$plugin])) {
                return wp_update_plugin($plugin);
            } else {
                return new WP_Error('no_update', 'No update available');
            }

        default:
            return new WP_Error('invalid_operation', 'Invalid operation');
    }
}

// Theme security audit
function audit_theme_security($theme_slug) {
    $theme = wp_get_theme($theme_slug);
    $theme_dir = $theme->get_stylesheet_directory();

    $security_issues = array();

    // Check for potentially dangerous files
    $dangerous_files = array(
        'eval.php',
        'base64_decode.php',
        'system.php',
        'exec.php'
    );

    foreach ($dangerous_files as $file) {
        if (file_exists($theme_dir . '/' . $file)) {
            $security_issues[] = "Potentially dangerous file found: {$file}";
        }
    }

    // Check for suspicious code patterns
    $php_files = glob($theme_dir . '/**/*.php');
    foreach ($php_files as $php_file) {
        $content = file_get_contents($php_file);

        // Check for dangerous functions
        $dangerous_functions = array('eval', 'base64_decode', 'system', 'exec', 'shell_exec');
        foreach ($dangerous_functions as $function) {
            if (strpos($content, $function . '(') !== false) {
                $security_issues[] = "Dangerous function '{$function}' found in {$php_file}";
            }
        }
    }

    return $security_issues;
}

// Plugin security assessment
function assess_plugin_security($plugin_file) {
    $plugin_data = get_plugin_data(WP_PLUGIN_DIR . '/' . $plugin_file);
    $security_score = 100;
    $issues = array();

    // Check plugin age (security updates become less frequent)
    $last_updated = strtotime($plugin_data['LastUpdated'] ?? '2020-01-01');
    $one_year_ago = strtotime('-1 year');

    if ($last_updated < $one_year_ago) {
        $issues[] = 'Plugin not updated in over a year';
        $security_score -= 30;
    }

    // Check for known security issues
    $security_issues = check_known_vulnerabilities($plugin_file);
    if (!empty($security_issues)) {
        $issues = array_merge($issues, $security_issues);
        $security_score -= 40;
    }

    // Check file permissions
    $plugin_dir = dirname(WP_PLUGIN_DIR . '/' . $plugin_file);
    if (is_writable($plugin_dir) && !is_plugin_active($plugin_file)) {
        $issues[] = 'Plugin directory is writable by unauthorized users';
        $security_score -= 15;
    }

    return array(
        'score' => max(0, $security_score),
        'issues' => $issues,
        'recommendations' => generate_security_recommendations($issues)
    );
}

function check_known_vulnerabilities($plugin_file) {
    // This would integrate with a vulnerability database
    // For demonstration, we'll check for common patterns

    $plugin_dir = dirname(WP_PLUGIN_DIR . '/' . $plugin_file);
    $issues = array();

    // Check for common vulnerability patterns
    $patterns = array(
        'SQL injection' => array('mysql_query', '$wpdb->query.*\$'),
        'XSS vulnerability' => array('echo \$_GET', 'echo \$_POST'),
        'File inclusion' => array('include \$_GET', 'require \$_POST')
    );

    $php_files = glob($plugin_dir . '/**/*.php');
    foreach ($php_files as $php_file) {
        $content = file_get_contents($php_file);

        foreach ($patterns as $vulnerability => $checks) {
            foreach ($checks as $check) {
                if (preg_match('/' . preg_quote($check, '/') . '/i', $content)) {
                    $issues[] = "Potential {$vulnerability} in {$php_file}";
                }
            }
        }
    }

    return $issues;
}

// Monitor theme performance impact
function monitor_theme_performance($theme_slug) {
    $start_time = microtime(true);

    // Simulate theme operations
    $theme = wp_get_theme($theme_slug);

    // Check theme loading time
    $loading_time = microtime(true) - $start_time;

    // Monitor memory usage
    $memory_usage = memory_get_peak_usage(true);

    // Check for performance issues
    $issues = array();

    if ($loading_time > 2.0) {
        $issues[] = 'Theme loading time is too slow (>2 seconds)';
    }

    if ($memory_usage > 100 * 1024 * 1024) { // 100MB
        $issues[] = 'Theme uses excessive memory (>100MB)';
    }

    // Check for N+1 queries
    global $wpdb;
    if ($wpdb->num_queries > 100) {
        $issues[] = 'Theme generates too many database queries (>100)';
    }

    return array(
        'loading_time' => $loading_time,
        'memory_usage' => $memory_usage,
        'query_count' => $wpdb->num_queries,
        'issues' => $issues
    );
}

// Monitor plugin performance impact
function monitor_plugin_performance($plugin_file) {
    $baseline = get_performance_baseline();

    // Activate plugin
    activate_plugin($plugin_file);

    // Run performance tests
    $with_plugin = run_performance_tests();

    // Deactivate plugin
    deactivate_plugins($plugin_file);

    // Calculate impact
    $impact = array();
    foreach ($baseline as $metric => $value) {
        $plugin_value = $with_plugin[$metric];
        $difference = $plugin_value - $value;
        $percentage = $value > 0 ? ($difference / $value) * 100 : 0;

        $impact[$metric] = array(
            'baseline' => $value,
            'with_plugin' => $plugin_value,
            'difference' => $difference,
            'percentage' => round($percentage, 2)
        );
    }

    return array(
        'baseline' => $baseline,
        'with_plugin' => $with_plugin,
        'impact' => $impact,
        'recommendation' => generate_performance_recommendation($impact)
    );
}

function get_performance_baseline() {
    return array(
        'loading_time' => measure_page_loading_time(),
        'memory_usage' => memory_get_peak_usage(true),
        'query_count' => $GLOBALS['wpdb']->num_queries
    );
}

function run_performance_tests() {
    // Run multiple performance tests and average results
    $tests = array();
    for ($i = 0; $i < 5; $i++) {
        $tests[] = get_performance_baseline();
        sleep(1); // Small delay between tests
    }

    // Calculate averages
    $averages = array();
    foreach ($tests[0] as $metric => $value) {
        $values = array_column($tests, $metric);
        $averages[$metric] = array_sum($values) / count($values);
    }

    return $averages;
}