<?php
/**
 * Clean-up when the plugin is deleted.
 *
 * Loaded by uninstall.php without the rest of the plugin (no autoloader), so it uses literal names.
 *
 * @package Smsportal
 */

namespace Smsportal;

defined( 'ABSPATH' ) || exit;

/**
 * Revokes the access key on smsportal.app (best effort), then removes the plugin's rules, tables,
 * options, transients and background jobs. On multisite: every site of the network.
 */
class Uninstall {

	const REVOKE_TIMEOUT = 5;

	const TABLES = array( 'smsportal_messages', 'smsportal_replies', 'smsportal_connection_log', 'smsportal_blocklist' );

	const OPTIONS = array( 'smsportal_connection', 'smsportal_pkce', 'smsportal_db_version', 'smsportal_reply_email', 'smsportal_owner_phone' );

	const HOOKS = array( 'smsportal_send_message', 'smsportal_amelia_reminder', 'smsportal_reply_mail', 'smsportal_daily', 'smsportal_hourly', 'smsportal_run_action_scheduler' );

	const GROUP = 'smsportal';

	const RULE_POST_TYPE = 'smsportal_rule';

	/**
	 * Clean up this site, or every site of a network.
	 *
	 * @return void
	 */
	public static function run(): void {
		if ( ! is_multisite() ) {
			self::site();
			return;
		}
		foreach ( get_sites(
			array(
				'fields' => 'ids',
				'number' => 0,
			)
		) as $site_id ) {
			switch_to_blog( (int) $site_id );
			self::site();
			restore_current_blog();
		}
	}

	/**
	 * Clean up the current site.
	 *
	 * @return void
	 */
	public static function site(): void {
		self::revoke();
		self::unschedule();
		self::delete_rules();
		self::drop_tables();
		self::delete_options();
	}

	/**
	 * Tell smsportal.app to revoke the key. Failures are ignored: the data goes either way.
	 *
	 * @return void
	 */
	private static function revoke(): void {
		$connection = get_option( 'smsportal_connection' );
		$api_key    = is_array( $connection ) && isset( $connection['api_key'] ) && is_string( $connection['api_key'] ) ? $connection['api_key'] : '';
		if ( '' === $api_key ) {
			return;
		}
		// A copy of the site (staging, a clone) holds the original's key: revoking it would cut the original off.
		$home = is_array( $connection ) && isset( $connection['home'] ) && is_string( $connection['home'] ) ? $connection['home'] : '';
		if ( '' !== $home && untrailingslashit( $home ) !== untrailingslashit( (string) get_option( 'home' ) ) ) {
			return;
		}
		$server = untrailingslashit( defined( 'SMSPORTAL_URL' ) ? (string) SMSPORTAL_URL : 'https://smsportal.app' );
		wp_remote_request(
			$server . '/api/v1/integrations/connection',
			array(
				'method'      => 'DELETE',
				'timeout'     => self::REVOKE_TIMEOUT,
				'redirection' => 0,
				'headers'     => array( 'x-api-key' => $api_key ),
			)
		);
	}

	/**
	 * Remove WP-Cron events and Action Scheduler actions of the plugin.
	 *
	 * @return void
	 */
	private static function unschedule(): void {
		foreach ( self::HOOKS as $hook ) {
			wp_unschedule_hook( $hook );
		}
		if ( function_exists( 'as_unschedule_all_actions' ) && self::has_action_scheduler_tables() ) {
			as_unschedule_all_actions( '', array(), self::GROUP );
		}
	}

	/**
	 * Whether this site has Action Scheduler's tables (on a network, not every site does).
	 *
	 * @return bool
	 */
	private static function has_action_scheduler_tables(): bool {
		global $wpdb;
		$table = $wpdb->prefix . 'actionscheduler_actions';
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- one check during uninstall.
		return $table === $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $table ) ) );
	}

	/**
	 * Delete the rules with their meta, in any status.
	 *
	 * @return void
	 */
	private static function delete_rules(): void {
		global $wpdb;
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- every status, including trash and auto-draft.
		$ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM {$wpdb->posts} WHERE post_type = %s", self::RULE_POST_TYPE ) );
		foreach ( is_array( $ids ) ? $ids : array() as $id ) {
			wp_delete_post( (int) $id, true );
		}
	}

	/**
	 * Drop the plugin's tables.
	 *
	 * @return void
	 */
	private static function drop_tables(): void {
		global $wpdb;
		// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.DirectDatabaseQuery.SchemaChange -- dropping the plugin's own tables.
		$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}smsportal_messages" );
		$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}smsportal_replies" );
		$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}smsportal_connection_log" );
		$wpdb->query( "DROP TABLE IF EXISTS {$wpdb->prefix}smsportal_blocklist" );
		// phpcs:enable
	}

	/**
	 * Delete the options and every smsportal_* option and transient (connection flow state, notices,
	 * caches, webhook de-duplication).
	 *
	 * @return void
	 */
	private static function delete_options(): void {
		global $wpdb;
		foreach ( self::OPTIONS as $option ) {
			delete_option( $option );
		}
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- names by prefix; the caches are cleared below.
		$wpdb->query(
			$wpdb->prepare(
				"DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s OR option_name LIKE %s",
				$wpdb->esc_like( 'smsportal_' ) . '%',
				$wpdb->esc_like( '_transient_smsportal_' ) . '%',
				$wpdb->esc_like( '_transient_timeout_smsportal_' ) . '%'
			)
		);
		wp_cache_delete( 'alloptions', 'options' );
		wp_cache_delete( 'notoptions', 'options' );
	}
}