<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class Argus_MU_Installer {

	public static function mu_plugins_dir() {
		return WPMU_PLUGIN_DIR; 
	}

	public static function target_path() {
		return trailingslashit( self::mu_plugins_dir() ) . 'argus-mu-core.php';
	}

	public static function source_path() {
		return ARGUS_WPD_DIR . 'mu-loader/argus-mu-core.php';
	}

	public static function install() {
		$dir = self::mu_plugins_dir();

		if ( ! file_exists( $dir ) ) {
			if ( ! wp_mkdir_p( $dir ) ) {
				update_option( 'argus_wpd_mu_install_status', 'failed_mkdir', false );
				return false;
			}
		}

		if ( ! is_writable( $dir ) ) { // phpcs:ignore WordPress.WP.AlternativeFunctions
			update_option( 'argus_wpd_mu_install_status', 'not_writable', false );
			return false;
		}

		$copied = copy( self::source_path(), self::target_path() );
		update_option( 'argus_wpd_mu_install_status', $copied ? 'installed' : 'failed_copy', false );

		return $copied;
	}

	const SELF_HEAL_LOG_COOLDOWN_OPTION = 'argus_wpd_mu_self_heal_last_logged';
	const SELF_HEAL_LOG_COOLDOWN_SECS   = HOUR_IN_SECONDS;

	public static function ensure_current() {
		$target = self::target_path();

		if ( ! file_exists( $target ) ) {
			self::maybe_log_self_heal( 'high', 'MU enforcement core was missing -- reinstalled', array( 'path' => $target ) );
			self::install();
			return;
		}

		if ( md5_file( $target ) !== md5_file( self::source_path() ) ) {
			self::maybe_log_self_heal( 'medium', 'MU enforcement core was out of date -- refreshed', array( 'path' => $target ) );
			self::install();
		}
	}

	protected static function maybe_log_self_heal( $severity, $message, array $context ) {
		$last = (int) get_option( self::SELF_HEAL_LOG_COOLDOWN_OPTION, 0 );
		if ( time() - $last < self::SELF_HEAL_LOG_COOLDOWN_SECS ) {
			return;
		}
		update_option( self::SELF_HEAL_LOG_COOLDOWN_OPTION, time(), false );
		Argus_Events::record( 'self_heal', $severity, $message, $context );
	}

	public static function status() {
		return get_option( 'argus_wpd_mu_install_status', 'unknown' );
	}

	const HEARTBEAT_OPTION           = 'argus_wpd_mu_core_heartbeat';
	const HEARTBEAT_INTERVAL_SECS    = 300;
	const HEARTBEAT_STALE_AFTER_SECS = 900;

	public static function execution_status() {
		$last = (int) get_option( self::HEARTBEAT_OPTION, 0 );
		if ( 0 === $last ) {

			return 'never';
		}
		return ( time() - $last ) <= self::HEARTBEAT_STALE_AFTER_SECS ? 'healthy' : 'stale';
	}

	public static function uninstall() {
		$target = self::target_path();
		if ( file_exists( $target ) ) {
			wp_delete_file( $target );
		}
		delete_option( 'argus_wpd_mu_install_status' );
	}
}