<?php
/**
 * Uninstall handler. Runs only when the plugin is deleted from WordPress.
 *
 * @package ImproveAB
 */

defined( 'WP_UNINSTALL_PLUGIN' ) || exit;

/*
 * Another copy of this plugin still installed in a folder of its own
 * (another build of it, or a second upload) runs on the same tables, options and
 * schedules: deleting this copy must take nothing from it, whatever the
 * opt-in below says. The copy being deleted is the one this file belongs
 * to: WordPress defines WP_UNINSTALL_PLUGIN once per request, so when
 * several plugins are deleted together (a bulk Delete without JavaScript,
 * WP-CLI with several names) it still names the first of them. Each copy is
 * told by its own folder, as WordPress names it: plugin_basename() gives a
 * folder that is a link its own name back (WordPress registers the real
 * path of the copy it deletes before it loads this file), and when it
 * cannot, nothing here is taken for this copy, so nothing is removed. The
 * list is read afresh: a copy deleted earlier in the same request is gone
 * from it.
 */
if ( ! function_exists( 'get_plugins' ) ) {
	require_once ABSPATH . 'wp-admin/includes/plugin.php';
}
wp_clean_plugins_cache( false );
$improveab_own = plugin_basename( __FILE__ );
foreach ( get_plugins() as $improveab_file => $improveab_plugin ) {
	if ( ! isset( $improveab_plugin['TextDomain'] ) || 'improveab-ab-testing' !== $improveab_plugin['TextDomain'] || 0 !== validate_plugin( $improveab_file ) ) {
		continue;
	}
	if ( dirname( $improveab_file ) . '/uninstall.php' !== $improveab_own ) {
		return;
	}
}

// A closure held in a variable of this file, not a named function: a copy
// that stood aside above defines nothing, and two copies deleted in one
// request never declare a function twice.
/**
 * Remove the plugin's state for the current site.
 *
 * Data is kept by default so an accidental delete-and-reinstall loses
 * nothing: tests, results and settings stay. Tables and options are only
 * removed when the user opted in via Settings → Data & privacy → "Delete
 * all data when the plugin is removed".
 * Caches, the upgrade lock and the scheduled events are removed either way:
 * they are worthless without the plugin, and the runtime cache can be an
 * autoloaded 64 KB blob that would otherwise load on every request forever.
 *
 * @return void
 */
$improveab_uninstall_site = static function () {
	global $wpdb;

	delete_option( 'improveab_runtime_cache' );
	delete_option( 'improveab_runtime_idle' );
	delete_option( 'improveab_runtime_events' );
	delete_option( 'improveab_runtime_lock' );
	delete_option( 'improveab_cache_gen' );
	delete_option( 'improveab_data_gen' );
	delete_option( 'improveab_upgrading' );
	delete_option( 'improveab_tally_lock' );
	delete_option( 'improveab_rollup_lock' );
	delete_option( 'improveab_create_lock' );
	delete_option( 'improveab_orphans' );
	// A slow report's recompute lock (remember()), held for one request.
	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- the plugin's own lock rows.
	$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", $wpdb->esc_like( 'improveab_agg_lock_' ) . '%' ) );
	delete_transient( 'improveab_split_map' );
	// The /event rate-limit counters (their own table) are nobody's data:
	// they go on every uninstall.
	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- the plugin's own counter rows.
	if ( $wpdb->prefix . 'improveab_rl' === $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->prefix . 'improveab_rl' ) ) ) ) {
		$wpdb->query( "DELETE FROM {$wpdb->prefix}improveab_rl" );
	}
	// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching

	// Scheduled events are always cleared, every one under the plugin's
	// prefix whatever scheduled it: nothing should keep firing for a plugin
	// that no longer exists.
	$improveab_hooks = array();
	foreach ( (array) get_option( 'cron', array() ) as $improveab_events ) {
		foreach ( is_array( $improveab_events ) ? array_keys( $improveab_events ) : array() as $improveab_hook ) {
			if ( is_string( $improveab_hook ) && 0 === strpos( $improveab_hook, 'improveab_' ) ) {
				$improveab_hooks[ $improveab_hook ] = true;
			}
		}
	}
	foreach ( array_keys( $improveab_hooks ) as $improveab_hook ) {
		wp_unschedule_hook( $improveab_hook );
	}

	$settings = get_option( 'improveab_settings', array() );
	if ( ! is_array( $settings ) || empty( $settings['delete_on_uninstall'] ) ) {
		// The record of which edition ran stays with the data it describes:
		// installed again, either edition finds it and knows whether the
		// visitors counted so far were assigned by other code.
		return;
	}

	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.DirectDatabaseQuery.SchemaChange -- Removing the plugin's own custom tables on user-requested uninstall.
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_events" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_daily" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_tally" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_buckets" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_variants" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_tests" );
	$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}improveab_rl" );
	// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.DirectDatabaseQuery.SchemaChange

	// Every option under the plugin's reserved prefix, whichever edition
	// or version stored it (one uploaded over another never ran its own
	// uninstall, so what that one kept is only here to remove), with the
	// plugin's transients and site transients and an order's lock: the
	// schema's version, the record of the edition that ran, the settings,
	// and the short-lived rows that would otherwise wait for the daily
	// expired-transient sweep. One by one through delete_option(), so a
	// persistent object cache forgets them too (its copy of the
	// autoloaded options among them); with such a cache the transients
	// never touched this table and lapse with their TTL.
	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Finding the plugin's own option rows on user-requested uninstall.
	$improveab_options = $wpdb->get_col(
		$wpdb->prepare(
			"SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s OR option_name LIKE %s OR option_name LIKE %s OR option_name LIKE %s",
			$wpdb->esc_like( 'improveab_' ) . '%',
			$wpdb->esc_like( '_transient_improveab_' ) . '%',
			$wpdb->esc_like( '_transient_timeout_improveab_' ) . '%',
			$wpdb->esc_like( '_site_transient_improveab_' ) . '%',
			$wpdb->esc_like( '_site_transient_timeout_improveab_' ) . '%'
		)
	);
	// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
	foreach ( (array) $improveab_options as $improveab_option ) {
		delete_option( $improveab_option );
	}

	// The tests a WooCommerce order's revenue was credited to (order meta),
	// in the posts tables or, with HPOS, in WooCommerce's own orders meta
	// table. Test ids start again at 1 after a reinstall, so a credit left
	// behind would zero a new test's revenue from that order.
	delete_metadata( 'post', 0, '_improveab_credited', '', true );
	delete_metadata( 'post', 0, '_improveab_pending', '', true );
	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.SlowDBQuery.slow_db_query_meta_key -- Removing the plugin's own order meta on user-requested uninstall; WooCommerce has no bulk API for it.
	if ( $wpdb->prefix . 'wc_orders_meta' === $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->prefix . 'wc_orders_meta' ) ) ) ) {
		$wpdb->delete( $wpdb->prefix . 'wc_orders_meta', array( 'meta_key' => '_improveab_credited' ) );
		$wpdb->delete( $wpdb->prefix . 'wc_orders_meta', array( 'meta_key' => '_improveab_pending' ) );
	}
	// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.SlowDBQuery.slow_db_query_meta_key

	// Each user's settings on this site under the plugin's prefix (the
	// guides seen, the results view): user options, so their meta keys
	// carry this site's table prefix and another site's stay.
	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.SlowDBQuery.slow_db_query_meta_key -- Finding the plugin's own user settings on user-requested uninstall.
	$improveab_prefs = $wpdb->get_col( $wpdb->prepare( "SELECT DISTINCT meta_key FROM {$wpdb->usermeta} WHERE meta_key LIKE %s", $wpdb->esc_like( $wpdb->get_blog_prefix() . 'improveab_' ) . '%' ) );
	foreach ( (array) $improveab_prefs as $improveab_pref ) {
		delete_metadata( 'user', 0, $improveab_pref, '', true );
	}

	// The manage-tests capability lives in the roles option; take it back.
	foreach ( wp_roles()->role_objects as $role ) {
		if ( $role->has_cap( 'improveab_manage_tests' ) ) {
			$role->remove_cap( 'improveab_manage_tests' );
		}
	}
};

// Tables, options, roles and cron are all site-scoped, and WordPress runs
// this file once from whichever site the delete was requested on. Walk the
// network so no site keeps orphaned tables or a recurring event with no
// listener (mirrors the per-site activation in ImproveAB_Install::activate()).
if ( is_multisite() && function_exists( 'get_sites' ) ) {
	foreach ( get_sites( array( 'fields' => 'ids', 'number' => 0 ) ) as $improveab_site_id ) {
		switch_to_blog( (int) $improveab_site_id );
		$improveab_uninstall_site();
		restore_current_blog();
	}
} else {
	$improveab_uninstall_site();
}