<?php
/**
 * Uninstall script for Fastless Cache.
 *
 * This runs when the plugin is deleted via the WordPress admin.
 * It removes all options, transients, cache directories, the advanced-cache.php
 * drop-in (only if it belongs to us), the WP_CACHE constant (only if we set it),
 * and the plugin's .htaccess rules.
 */

if (! defined('WP_UNINSTALL_PLUGIN')) {
    exit;
}

// Delete plugin options.
delete_option('fastless_cache');
delete_option('fastless_cache_settings_version');
delete_option('fastless_cache_wp_cache_set_by_us');
delete_option('fastless_cache_conflicting_plugin');
delete_option('fastless_cache_dropin_conflict');

// Delete transients.
delete_transient('fastless_cache_cache_size');
delete_transient('fastless_cache_cache_count');
delete_transient('fastless_cache_cache_cleared_' . get_current_user_id());

// Delete site transients (multisite).
delete_site_transient('fastless_cache_disk_updated');

// Clean up any remaining fastless_cache_* transients.
global $wpdb;
if (isset($wpdb) && is_object($wpdb)) {
    $fastless_cache_transients = $wpdb->get_col($wpdb->prepare( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching -- one-time uninstall cleanup requires direct query to find all matching transients; no caching needed.
        "SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
        '_transient_fastless_cache_%',
        '_transient_timeout_fastless_cache_%'
    ));

    if (is_array($fastless_cache_transients)) {
        foreach ($fastless_cache_transients as $fastless_cache_transient) {
            delete_transient(preg_replace('/^_transient_(timeout_)?/', '', $fastless_cache_transient));
        }
    }
}

// Initialize WP_Filesystem for safe file operations.
//
// WP_Filesystem() returns a boolean and exposes the filesystem through the
// $wp_filesystem global — its return value is NOT the filesystem object.
$fastless_cache_filesystem = null;
require_once ABSPATH . 'wp-admin/includes/file.php';
WP_Filesystem();
global $wp_filesystem;
if (isset($wp_filesystem) && is_object($wp_filesystem)) {
    $fastless_cache_filesystem = $wp_filesystem;
}
if (! $fastless_cache_filesystem) {
    // If WP_Filesystem fails, we can't safely proceed with file operations.
    return;
}

// Remove cache and settings directories.
$fastless_cache_cache_dir     = WP_CONTENT_DIR . '/cache/fastless-cache';
$fastless_cache_settings_dir  = WP_CONTENT_DIR . '/cache/fastless-cache-settings';

if ($fastless_cache_filesystem->is_dir($fastless_cache_cache_dir)) {
    $fastless_cache_filesystem->delete($fastless_cache_cache_dir, true);
}
if ($fastless_cache_filesystem->is_dir($fastless_cache_settings_dir)) {
    $fastless_cache_filesystem->delete($fastless_cache_settings_dir, true);
}

// Remove our advanced-cache.php drop-in only if it belongs to us.
$fastless_cache_advanced_cache_file = WP_CONTENT_DIR . '/advanced-cache.php';
if ($fastless_cache_filesystem->is_readable($fastless_cache_advanced_cache_file)) {
    $fastless_cache_contents = $fastless_cache_filesystem->get_contents($fastless_cache_advanced_cache_file);
    if (is_string($fastless_cache_contents) && strpos($fastless_cache_contents, 'FASTLESS_CACHE_DROPIN') !== false) {
        $fastless_cache_filesystem->delete($fastless_cache_advanced_cache_file);
    }
}

// Remove WP_CACHE constant from wp-config.php if we added it.
if (file_exists(ABSPATH . 'wp-config.php')) {
    $fastless_cache_wp_config_file = ABSPATH . 'wp-config.php';
} elseif (file_exists(dirname(ABSPATH) . '/wp-config.php') && ! file_exists(dirname(ABSPATH) . '/wp-settings.php')) {
    $fastless_cache_wp_config_file = dirname(ABSPATH) . '/wp-config.php';
} else {
    $fastless_cache_wp_config_file = false;
}

if ($fastless_cache_wp_config_file && $fastless_cache_filesystem->is_readable($fastless_cache_wp_config_file) && $fastless_cache_filesystem->is_writable($fastless_cache_wp_config_file)) {
    $fastless_cache_contents = $fastless_cache_filesystem->get_contents($fastless_cache_wp_config_file);
    if (is_string($fastless_cache_contents)) {
        if (strpos($fastless_cache_contents, '/** Enables page caching for Fastless Cache. */') !== false) {
            $fastless_cache_new_contents = preg_replace('#/\*\* Enables page caching for Fastless Cache\. \*/\r?\n.+\r?\n.+\r?\n\}\r?\n(\r?\n)?#', '', $fastless_cache_contents);
            if (is_string($fastless_cache_new_contents) && ! empty($fastless_cache_new_contents)) {
                $fastless_cache_filesystem->put_contents($fastless_cache_wp_config_file, $fastless_cache_new_contents, FS_CHMOD_FILE);
            }
        } elseif (strpos($fastless_cache_contents, '// Added by Fastless Cache') !== false) {
            $fastless_cache_new_contents = preg_replace('#.+Added by Fastless Cache\r?\n#', '', $fastless_cache_contents);
            if (is_string($fastless_cache_new_contents) && ! empty($fastless_cache_new_contents)) {
                $fastless_cache_filesystem->put_contents($fastless_cache_wp_config_file, $fastless_cache_new_contents, FS_CHMOD_FILE);
            }
        }
    }
}

// Remove our .htaccess rules.
$fastless_cache_htaccess_file = ABSPATH . '.htaccess';
if ($fastless_cache_filesystem->exists($fastless_cache_htaccess_file) && $fastless_cache_filesystem->is_readable($fastless_cache_htaccess_file) && $fastless_cache_filesystem->is_writable($fastless_cache_htaccess_file)) {
    $fastless_cache_contents = $fastless_cache_filesystem->get_contents($fastless_cache_htaccess_file);
    if (is_string($fastless_cache_contents)) {
        $fastless_cache_new_contents = preg_replace('/# BEGIN FastlessCache.*?# END FastlessCache(?:\r?\n)*/s', '', $fastless_cache_contents);
        if (is_string($fastless_cache_new_contents)) {
            $fastless_cache_filesystem->put_contents($fastless_cache_htaccess_file, $fastless_cache_new_contents, FS_CHMOD_FILE);
        }
    }
}