<?php
/**
 * Uninstall cleanup - runs when the plugin is deleted via WP Admin.
 *
 * Only purges data when the user has opted in via the
 * "Delete all data on uninstall" setting (acceguru_delete_on_uninstall).
 * Otherwise all options, post meta, and transients are preserved so that
 * reinstalling the plugin restores the previous state.
 */

declare(strict_types=1);

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

/**
 * Leaves the plugin-created statement page in a usable state.
 *
 * When plugin data is preserved, replace only the AcceGuru shortcode with
 * its final rendered HTML. When data is being removed, move the tracked page
 * to the Trash. A page whose content no longer contains the shortcode is
 * treated as user-managed content and is left untouched.
 *
 * @param bool $delete_data Whether the user opted into deleting plugin data.
 */
function acceguru_uninstall_handle_statement_page( bool $delete_data ): void {
	$page_id = absint( get_option( 'acceguru_statement_page_id', 0 ) );
	if ( $page_id <= 0 ) {
		return;
	}

	$page = get_post( $page_id );
	if ( ! $page instanceof WP_Post || 'page' !== $page->post_type ) {
		return;
	}

	$content           = (string) $page->post_content;
	$shortcode_pattern = '~' . get_shortcode_regex( array( 'acceguru_statement' ) ) . '~s';
	$shortcode_matches = array();
	preg_match_all( $shortcode_pattern, $content, $shortcode_matches, PREG_SET_ORDER );

	$has_statement_shortcode = false;
	foreach ( $shortcode_matches as $shortcode_match ) {
		// [[acceguru_statement]] is escaped text, not a live shortcode.
		if ( '[' !== $shortcode_match[1] || ']' !== $shortcode_match[6] ) {
			$has_statement_shortcode = true;
			break;
		}
	}
	if ( ! $has_statement_shortcode ) {
		return;
	}

	if ( $delete_data ) {
		wp_trash_post( $page_id );
		return;
	}

	// The plugin itself is not loaded during uninstall, so load only the two
	// classes needed to render the final statement before its data disappears.
	if ( ! class_exists( 'Acceguru_Scanner', false ) ) {
		require_once __DIR__ . '/includes/class-acceguru-scanner.php';
	}
	if ( ! class_exists( 'Acceguru_Admin', false ) ) {
		require_once __DIR__ . '/includes/class-acceguru-admin.php';
	}

	$statement_html = Acceguru_Admin::build_statement_html();
	if ( '' === trim( $statement_html ) ) {
		return;
	}

	$static_content = preg_replace_callback(
		$shortcode_pattern,
		static function ( array $matches ) use ( $statement_html ): string {
			// Preserve an intentionally escaped [[acceguru_statement]].
			if ( '[' === $matches[1] && ']' === $matches[6] ) {
				return $matches[0];
			}
			return $statement_html;
		},
		$content
	);

	if ( ! is_string( $static_content ) || $static_content === $content ) {
		return;
	}

	wp_update_post(
		array(
			'ID'           => $page_id,
			'post_content' => wp_slash( $static_content ),
		),
		true
	);
}

/**
 * Wipe all AcceGuru data from the current site.
 */
function acceguru_uninstall_purge_site(): void {
	global $wpdb;

	$delete_data = 1 === absint( get_option( 'acceguru_delete_on_uninstall', 0 ) );

	// Handle the statement while its page ID and rendering data still exist.
	acceguru_uninstall_handle_statement_page( $delete_data );

	// Honor opt-in. If the option is missing or 0, leave plugin data intact.
	if ( ! $delete_data ) {
		return;
	}

	// Bulk uninstall purges - cache layer is moot at uninstall time.

	// Options (covers settings + the AI API key).
	$wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery -- Bulk uninstall cleanup; core has no delete-options-by-prefix API and caching is moot at uninstall time.
		$wpdb->prepare(
			"DELETE FROM {$wpdb->options} WHERE option_name LIKE %s",
			$wpdb->esc_like( 'acceguru_' ) . '%'
		)
	);

	// Post meta created by AcceGuru and compatible add-ons.
	$wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery -- Bulk uninstall cleanup; core has no delete-post-meta-by-prefix API and caching is moot at uninstall time.
		$wpdb->prepare(
			"DELETE FROM {$wpdb->postmeta} WHERE meta_key LIKE %s",
			$wpdb->esc_like( '_acceguru_' ) . '%'
		)
	);

	// Transients.
	$wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery -- Bulk uninstall cleanup of the plugin's transients; core has no delete-by-prefix API and caching is moot at uninstall time.
		$wpdb->prepare(
			"DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
			$wpdb->esc_like( '_transient_acceguru_' ) . '%',
			$wpdb->esc_like( '_transient_timeout_acceguru_' ) . '%'
		)
	);

	// Scheduled cron events registered by the plugin.
	$crons = _get_cron_array();
	if ( is_array( $crons ) ) {
		foreach ( $crons as $timestamp => $hooks ) {
			if ( ! is_array( $hooks ) ) {
				continue;
			}
			foreach ( array_keys( $hooks ) as $hook ) {
				if ( is_string( $hook ) && 0 === strpos( $hook, 'acceguru_' ) ) {
					wp_clear_scheduled_hook( $hook );
				}
			}
		}
	}
}

if ( is_multisite() ) {
	// phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound
	$site_ids = get_sites( array( 'fields' => 'ids', 'number' => 0 ) );
	foreach ( $site_ids as $site_id ) {
		switch_to_blog( (int) $site_id );
		acceguru_uninstall_purge_site();
		restore_current_blog();
	}
	// phpcs:enable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound
} else {
	acceguru_uninstall_purge_site();
}