<?php

declare(strict_types=1);

namespace LIT\MCP;

defined('ABSPATH') || exit;

/**
 * Removes WP-LIT-MCP's own data (uninstall.php, Task 12): options (incl. the Snapshots des
 * Designsystems and their change locks, Etappe 4), the endpoint-check and Divi-release
 * transients, the log-cleanup cron hook and the change log table – on every site of a
 * network – and the Protokoll tab's per-user screen option.
 *
 * Deliberately self-contained (no reference to any other LIT\MCP\* class): uninstall.php
 * is executed by WordPress core standalone, without loading the plugin's main file first,
 * so the Composer/Jetpack autoloader is not guaranteed to have run. The option/hook/table
 * names below are therefore duplicated from Access::OPTION, Abilities\ExposurePolicy::OPTION,
 * Limits::OPTION, ChangeLog\ChangeLogInstaller::VERSION_OPTION, Integrations\Divi\Release\
 * ReleaseStore::OPTION, Integrations\Divi\Release\CheckReportStore::OPTION, Integrations\
 * Divi\Release\DiviCheckRoute::LOCK, Integrations\Divi\Design\DesignLock::option(),
 * Admin\ConnectionStatus::ENDPOINT_TRANSIENT, Integrations\Divi\Release\ReleaseResolver::CACHE,
 * ChangeLog\ChangeLogCleanup::HOOK, ChangeLog\ChangeLog::TABLE and Admin\LogTab::PER_PAGE_OPTION
 * on purpose;
 * tests/Unit/UninstallerTest.php and tests/Unit/UninstallTest.php keep them in sync with
 * those constants.
 *
 * Never touches the bundled wp-media/mcp-oauth library's data (option mcp_jwt_secret,
 * option wpmedia_mcp_oauth_rewrite_version, user meta mcp_refresh_jti_*, application
 * passwords of connected clients) – that library may be shared with other plugins on
 * this site. Never deletes posts, attachments or revisions.
 */
final class Uninstaller
{
    private const OPTIONS = [
        'lit_mcp_allowed_roles', 'lit_mcp_exposure', 'lit_mcp_limits', 'lit_mcp_db_version',
        'lit_mcp_divi_releases', 'lit_mcp_divi_check_report', 'lit_mcp_divi_check_lock',
        'lit_mcp_snapshots_colors', 'lit_mcp_snapshots_variables', 'lit_mcp_snapshots_presets',
        'lit_mcp_snapshots_theme_options',
        'lit_mcp_lock_colors', 'lit_mcp_lock_variables', 'lit_mcp_lock_presets', 'lit_mcp_lock_theme_options',
    ];
    private const TRANSIENTS = ['lit_mcp_endpoint_check', 'lit_mcp_divi_state'];
    private const CRON_HOOK = 'lit_mcp_log_cleanup';
    private const TABLE = 'lit_mcp_log';

    /** Screen option "Einträge pro Seite" of the Protokoll tab (Admin\LogTab::PER_PAGE_OPTION): user meta. */
    private const USER_META = 'lit_mcp_log_per_page';

    public static function run(): void
    {
        // User meta is shared by every site of a network: removed once, for all users.
        delete_metadata('user', 0, self::USER_META, '', true);

        if (! is_multisite()) {
            self::removeSiteData();

            return;
        }

        foreach (get_sites(['fields' => 'ids', 'number' => 0]) as $site_id) {
            switch_to_blog((int) $site_id);
            self::removeSiteData();
            restore_current_blog();
        }
    }

    public static function removeSiteData(): void
    {
        global $wpdb;

        foreach (self::OPTIONS as $option) {
            delete_option($option);
        }
        foreach (self::TRANSIENTS as $transient) {
            delete_transient($transient);
        }
        wp_clear_scheduled_hook(self::CRON_HOOK);

        $table = $wpdb->prefix . self::TABLE;
        // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- own table name, not user input.
        $wpdb->query("DROP TABLE IF EXISTS {$table}");
    }
}