<?php
/**
 * One-time migration from the pre-0.9.0 `gc_` names to `genius_commerce_`.
 *
 * Up to 0.8.x the plugin stored its options, transients and attachment meta
 * under a `gc_` prefix. 0.9.0 renamed everything to `genius_commerce_` (the
 * WordPress.org review requires a prefix of at least four characters). Without
 * this migration an upgraded store would lose its API key and webhook secret
 * and silently drop its connection with Genius Commerce.
 *
 * @package GeniusCommerce
 */

namespace GeniusCommerce;

defined( 'ABSPATH' ) || exit;

/**
 * Moves stored data from the legacy names to the current ones.
 */
final class GC_Legacy_Migration {

	/**
	 * Option names without prefix, as stored by 0.8.x.
	 *
	 * @var string[]
	 */
	private const OPTIONS = array(
		'activated_at',
		'allowed_ips',
		'api_key',
		'backend_url',
		'connection_status',
		'custom_css',
		'default_delivery_time',
		'delivery_position',
		'enable_delivery_display',
		'enable_discount_display',
		'enable_logging',
		'last_connection_check',
		'registered_webhooks',
		'scope_enforcement_enabled',
		'sync_mapping',
		'trust_forwarded_for',
		'webhook_secret',
		'webhook_settings',
		'template_delivery',
		'template_delivery-cart',
		'template_delivery-product',
		'template_discount-price',
		'template_discount_price',
	);

	/**
	 * Transients without prefix. Per-user and per-request transients
	 * (discounts, rate limits) are left to expire on their own.
	 *
	 * @var string[]
	 */
	private const TRANSIENTS = array(
		'connect_nonce',
		'connection_test',
		'field_discovery',
		'scopes_cache',
		'webhook_bootstrap_lock',
	);

	/**
	 * Cron hooks without prefix.
	 *
	 * @var string[]
	 */
	private const CRON_HOOKS = array(
		'bootstrap_webhooks',
		'cleanup_logs',
		'refresh_scopes',
		'webhook_health_check',
	);

	/**
	 * Run the migration once per install.
	 *
	 * Called on `plugins_loaded` (a plain file upgrade does not fire the
	 * activation hook) and from the activation hook (which stores the version,
	 * so the `plugins_loaded` check would otherwise skip it after a reactivate).
	 *
	 * @return void
	 */
	public static function maybe_run(): void {
		if ( false !== get_option( 'genius_commerce_version' ) ) {
			return;
		}

		self::run();
		update_option( 'genius_commerce_version', GENIUS_COMMERCE_VERSION );
	}

	/**
	 * Copy every legacy option to its new name and remove the old one.
	 *
	 * An option that already exists under the new name is left alone.
	 *
	 * @return void
	 */
	private static function run(): void {
		global $wpdb;

		$alloptions = wp_load_alloptions();

		foreach ( self::OPTIONS as $name ) {
			$legacy = 'gc_' . $name;
			$value  = get_option( $legacy );

			if ( false === $value ) {
				continue;
			}

			$autoload = array_key_exists( $legacy, $alloptions ) ? 'yes' : 'no';
			add_option( 'genius_commerce_' . $name, $value, '', $autoload );
			delete_option( $legacy );
		}

		delete_option( 'gc_version' );

		foreach ( self::TRANSIENTS as $name ) {
			delete_transient( 'gc_' . $name );
		}

		foreach ( self::CRON_HOOKS as $name ) {
			wp_clear_scheduled_hook( 'gc_' . $name );
		}

		// Image deduplication looks attachments up by this key; without the
		// rename every product sync would download the same images again.
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- One-time bulk rename of a meta key; no core API for that.
		$wpdb->update(
			$wpdb->postmeta,
			array( 'meta_key' => '_genius_commerce_source_url' ), // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
			array( 'meta_key' => '_gc_source_url' ) // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
		);
	}
}