<?php
namespace Relay\Install;

use Relay\Database\Db;
use Relay\Database\Naming;
use Relay\Files\Fs;
use Relay\Support\Paths;

/** Removes everything Relay created: its tables, temp/import/backup tables, options, cron hook and folders. */
final class Uninstaller
{
    /**
     * Whether the plugin being deleted is this one. Deleting the old Relay 0.9.x (folder relay-migrate) while SiteRelay
     * is active runs that plugin's uninstall.php, which loads this class: SiteRelay's data must then stay.
     */
    public static function for_this_plugin(string $uninstalling): bool
    {
        return $uninstalling === plugin_basename(dirname(__DIR__, 2) . '/siterelay.php');
    }

    public static function run(): void
    {
        if (defined('WP_UNINSTALL_PLUGIN') && !self::for_this_plugin((string) WP_UNINSTALL_PLUGIN)) {
            return;
        }
        global $wpdb;
        $db = new Db($wpdb);

        $db->raw('SET FOREIGN_KEY_CHECKS = 0');
        try {
            foreach ([Naming::TEMP, Naming::BACKUP, Naming::IMPORT] as $prefix) {
                foreach ($db->col($wpdb->prepare('SHOW TABLES LIKE %s', $wpdb->esc_like($prefix) . '%')) as $table) {
                    $db->raw('DROP TABLE IF EXISTS ' . Db::ident($table));
                }
            }
            foreach (Schema::tables() as $table) {
                $db->raw('DROP TABLE IF EXISTS ' . Db::ident($table));
            }
        } finally {
            $db->raw('SET FOREIGN_KEY_CHECKS = 1');
        }

        delete_site_option('relay_settings');
        delete_site_option('relay_schema_version');
        delete_site_option('relay_mode');
        delete_site_option('relay_auto_lock');
        delete_site_option('relay_compat_whitelist');
        delete_site_option('relay_notifications');
        delete_site_option(Paths::FOLDERS_OPTION);
        // What Relay's GitHub updater (0.9.x) stored: the encrypted key, the last check and the cached release.
        delete_site_option('relay_update_key');
        delete_site_option('relay_update_status');
        delete_site_transient('relay_update_release');
        CompatPlugin::remove();
        wp_clear_scheduled_hook('relay_daily');
        wp_clear_scheduled_hook(\Relay\Files\PointArchive::HOOK);

        // Exports, backups, restore staging and file restore points (uploads/siterelay, or a folder an earlier version
        // set up), under the names of this version or an earlier one.
        $uploads = wp_upload_dir(null, false);
        foreach (Paths::NAMES as $name) {
            Fs::remove_tree(trailingslashit($uploads['basedir']) . $name);
            Fs::remove_tree(Paths::work_dir() . '/' . $name . '-staging');
            Fs::remove_tree(Paths::work_dir() . '/' . $name . '-backups');
        }
    }
}