<?php
/**
 * Remove plugin data when the plugin is deleted from the dashboard.
 *
 * Original image backups in the uploads folder are left in place. They are the
 * site owner's files, and the folder is documented in readme.txt.
 *
 * @package FlipWebP
 */

defined( 'WP_UNINSTALL_PLUGIN' ) || exit;

/**
 * Delete options, transients, and attachment meta for the current site.
 *
 * @return void
 */
function flipwebp_uninstall_current_site() {
	global $wpdb;

	delete_option( 'flipwebp_settings' );
	delete_option( 'flipwebp_stats' );

	$meta_keys = array(
		'_flipwebp_status',
		'_flipwebp_skip_reason',
		'_flipwebp_original_bytes',
		'_flipwebp_webp_bytes',
		'_flipwebp_saved_bytes',
		'_flipwebp_converted_at',
		'_flipwebp_backup',
	);

	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Uninstall cleanup has no higher-level API for deleting a fixed list of meta keys.
	$wpdb->query(
		$wpdb->prepare(
			"DELETE FROM {$wpdb->postmeta} WHERE meta_key IN ( %s, %s, %s, %s, %s, %s, %s )",
			$meta_keys[0],
			$meta_keys[1],
			$meta_keys[2],
			$meta_keys[3],
			$meta_keys[4],
			$meta_keys[5],
			$meta_keys[6]
		)
	);

	$transient_like = $wpdb->esc_like( '_transient_flipwebp_' ) . '%';
	$timeout_like   = $wpdb->esc_like( '_transient_timeout_flipwebp_' ) . '%';

	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Uninstall cleanup has no higher-level API.
	$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s", $transient_like, $timeout_like ) );

	flipwebp_uninstall_delete_tmp();
}

/**
 * Delete the temporary working directory and nothing outside it.
 *
 * @return void
 */
function flipwebp_uninstall_delete_tmp() {
	$uploads = wp_upload_dir();
	if ( ! empty( $uploads['error'] ) || empty( $uploads['basedir'] ) ) {
		return;
	}

	$root = wp_normalize_path( trailingslashit( $uploads['basedir'] ) . 'flipwebp-tmp' );
	$real = realpath( $root );
	$base = realpath( $uploads['basedir'] );

	if ( false === $real || false === $base ) {
		return;
	}

	$real = wp_normalize_path( $real );
	$base = trailingslashit( wp_normalize_path( $base ) );
	$real_cmp = $real;
	$base_cmp = $base;

	if ( 'Windows' === PHP_OS_FAMILY ) {
		$real_cmp = strtolower( $real_cmp );
		$base_cmp = strtolower( $base_cmp );
	}

	if ( 0 !== strpos( trailingslashit( $real_cmp ), $base_cmp ) || 'flipwebp-tmp' !== strtolower( wp_basename( $real ) ) ) {
		return;
	}

	flipwebp_uninstall_delete_tree( $real, trailingslashit( $real ) );
}

/**
 * Recursively delete a directory that is confirmed to sit inside the tmp root.
 *
 * @param string $dir      Absolute directory path.
 * @param string $tmp_root Absolute tmp root with a trailing slash.
 * @return void
 */
function flipwebp_uninstall_delete_tree( $dir, $tmp_root ) {
	$dir = wp_normalize_path( (string) $dir );
	$dir_cmp = $dir;
	$root_cmp = $tmp_root;

	if ( 'Windows' === PHP_OS_FAMILY ) {
		$dir_cmp  = strtolower( $dir_cmp );
		$root_cmp = strtolower( $root_cmp );
	}

	if ( 0 !== strpos( trailingslashit( $dir_cmp ), $root_cmp ) ) {
		return;
	}

	$items = scandir( $dir );
	if ( ! is_array( $items ) ) {
		return;
	}

	foreach ( $items as $item ) {
		if ( '.' === $item || '..' === $item ) {
			continue;
		}

		$path = $dir . '/' . $item;
		if ( is_dir( $path ) && ! is_link( $path ) ) {
			flipwebp_uninstall_delete_tree( $path, $tmp_root );
			continue;
		}

		if ( is_file( $path ) && ! is_link( $path ) ) {
			wp_delete_file( $path );
		}
	}

	// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_rmdir -- Local plugin temp directory, already constrained to uploads/flipwebp-tmp.
	rmdir( $dir );
}

if ( is_multisite() ) {
	$flipwebp_site_ids = get_sites(
		array(
			'fields' => 'ids',
			'number' => 0,
		)
	);

	foreach ( $flipwebp_site_ids as $flipwebp_site_id ) {
		switch_to_blog( (int) $flipwebp_site_id );
		flipwebp_uninstall_current_site();
		restore_current_blog();
	}
} else {
	flipwebp_uninstall_current_site();
}