<?php
/**
 * Uninstall script for Newsletter - SMTP (by ROBOTSTXT).
 *
 * This file is called when the plugin is deleted via WordPress admin.
 * It removes all plugin data from the database.
 *
 * @package ROBOTSTXT_SMTP_Newsletter
 */

// Exit if not called by WordPress uninstaller.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}

/**
 * Delete plugin options and transients.
 *
 * @param int $site_id Site ID (for multisite).
 * @return void
 */
function robotstxt_smtp_newsletter_delete_site_data( $site_id = null ) {
	// Switch to site if multisite.
	if ( is_multisite() && $site_id ) {
		switch_to_blog( $site_id );
	}

	// Delete plugin options.
	delete_option( 'robotstxt_smtp_newsletter_options' );

	// Delete updater cache transients.
	$plugin_basename = 'robotstxt-smtp-newsletter/robotstxt-smtp-newsletter.php';
	$cache_key       = 'robotstxt_updater_' . md5( $plugin_basename );
	delete_site_transient( $cache_key );

	// Restore current blog if multisite.
	if ( is_multisite() && $site_id ) {
		restore_current_blog();
	}
}

// Single site installation.
if ( ! is_multisite() ) {
	robotstxt_smtp_newsletter_delete_site_data();
} else {
	// Multisite installation.
	global $wpdb;

	// Get all blog IDs.
	$blog_ids = $wpdb->get_col( "SELECT blog_id FROM {$wpdb->blogs}" );

	// Delete data for each site.
	foreach ( $blog_ids as $blog_id ) {
		robotstxt_smtp_newsletter_delete_site_data( $blog_id );
	}

	// Delete network-wide updater cache.
	$plugin_basename = 'robotstxt-smtp-newsletter/robotstxt-smtp-newsletter.php';
	$cache_key       = 'robotstxt_updater_' . md5( $plugin_basename );
	delete_site_transient( $cache_key );
}

// Clear WordPress update cache to remove our plugin from the list.
delete_site_transient( 'update_plugins' );