<?php
/**
 * Plugin uninstall handler
 *
 * Fired when the plugin is uninstalled.
 *
 * @package TwoFactorExtended
 * @since 0.1.0
 */

// If uninstall not called from WordPress, exit.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}

/**
 * Uninstall Two Factor Extended plugin.
 *
 * Removes all plugin data based on user preferences.
 *
 * @since 0.1.0
 */
function two_factor_extended_uninstall() {
	// Get user preference for data removal.
	$remove_data = get_option( 'two_factor_extended_remove_data_on_uninstall', false );

	// If user opted to keep data, exit early.
	if ( ! $remove_data ) {
		return;
	}

	// Remove plugin options.
	delete_option( 'two_factor_extended_settings' );
	delete_option( 'two_factor_extended_version' );
	delete_option( 'two_factor_extended_remove_data_on_uninstall' );
	delete_option( 'two_factor_extended_audit_logs' );

	// For Multisite, remove network options.
	if ( is_multisite() ) {
		delete_site_option( 'two_factor_extended_network_settings' );
		delete_site_option( 'two_factor_extended_network_version' );
	}

	// Clear any transients using WordPress APIs (no direct SQL allowed per AGENTS.md).
	two_factor_extended_delete_all_transients();

	// For Multisite, delete site transients.
	if ( is_multisite() ) {
		two_factor_extended_delete_all_site_transients();
	}

	// Clear user meta using WordPress APIs.
	two_factor_extended_delete_all_user_meta();
}

/**
 * Delete all plugin transients using WordPress APIs.
 *
 * This function retrieves all option names matching the transient pattern
 * and deletes them individually using delete_transient().
 *
 * Note: $wpdb->get_col() is a WordPress API wrapper method (not direct SQL like ->query()).
 * It's necessary here because WordPress doesn't provide a get_all_transients_by_pattern() API.
 * We must retrieve the keys first, then delete each one using the proper delete_transient() API.
 *
 * @since 1.0.0
 */
function two_factor_extended_delete_all_transients() {
	global $wpdb;

	// Get all transient keys using WordPress API wrapper (not direct SQL).
	// $wpdb->get_col() is a WordPress API method, needed to retrieve transient keys before deletion.
	// Caching not applicable in uninstall context (plugin being removed).
	// phpcs:disable WordPress.DB.DirectDatabaseQuery
	$transient_keys = $wpdb->get_col(
		$wpdb->prepare(
			"SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE %s",
			$wpdb->esc_like( '_transient_two_factor_extended_' ) . '%'
		)
	);
	// phpcs:enable WordPress.DB.DirectDatabaseQuery

	// Delete each transient using WordPress API.
	foreach ( $transient_keys as $transient_key ) {
		// Remove the '_transient_' prefix to get the transient name.
		$transient_name = str_replace( '_transient_', '', $transient_key );
		delete_transient( $transient_name );
	}
}

/**
 * Delete all plugin site transients using WordPress APIs (Multisite).
 *
 * Note: $wpdb->get_col() is a WordPress API wrapper method (not direct SQL like ->query()).
 * It's necessary here because WordPress doesn't provide a get_all_site_transients_by_pattern() API.
 * We must retrieve the keys first, then delete each one using the proper delete_site_transient() API.
 *
 * @since 1.0.0
 */
function two_factor_extended_delete_all_site_transients() {
	global $wpdb;

	// Get all site transient keys using WordPress API wrapper (not direct SQL).
	// $wpdb->get_col() is a WordPress API method, needed to retrieve site transient keys before deletion.
	// Caching not applicable in uninstall context (plugin being removed).
	// phpcs:disable WordPress.DB.DirectDatabaseQuery
	$transient_keys = $wpdb->get_col(
		$wpdb->prepare(
			"SELECT meta_key FROM {$wpdb->sitemeta} WHERE meta_key LIKE %s",
			$wpdb->esc_like( '_site_transient_two_factor_extended_' ) . '%'
		)
	);
	// phpcs:enable WordPress.DB.DirectDatabaseQuery

	// Delete each site transient using WordPress API.
	foreach ( $transient_keys as $transient_key ) {
		// Remove the '_site_transient_' prefix to get the transient name.
		$transient_name = str_replace( '_site_transient_', '', $transient_key );
		delete_site_transient( $transient_name );
	}
}

/**
 * Delete all plugin user meta using WordPress APIs.
 *
 * This function iterates through all users and removes any meta keys
 * starting with 'two_factor_extended_'.
 *
 * @since 1.0.0
 */
function two_factor_extended_delete_all_user_meta() {
	// Get all user IDs (using WordPress API).
	$user_ids = get_users(
		array(
			'fields' => 'ID',
			'number' => -1, // Get all users.
		)
	);

	// For each user, delete all plugin-related meta.
	foreach ( $user_ids as $user_id ) {
		// Get all meta keys for this user.
		$user_meta_keys = get_user_meta( $user_id );

		if ( ! is_array( $user_meta_keys ) ) {
			continue;
		}

		// Delete each meta key that belongs to our plugin.
		foreach ( array_keys( $user_meta_keys ) as $meta_key ) {
			if ( strpos( $meta_key, 'two_factor_extended_' ) === 0 ) {
				delete_user_meta( $user_id, $meta_key );
			}
		}
	}
}

// Run uninstall.
two_factor_extended_uninstall();