<?php
namespace QWSpeedCache\Compatibility;

defined( 'ABSPATH' ) || exit;

/**
 * Maintenance mode for visitors (manual or scheduled window).
 */
class MaintenanceMode {

	public function __construct() {
		add_action( 'template_redirect', array( $this, 'maybe_block' ), 0 );
	}

	/**
	 * @return bool
	 */
	public static function is_window_active( array $s ) {
		// Manual maintenance must never be switched off by a scheduled window.
		if ( ! empty( $s['maintenance_mode'] ) ) {
			return true;
		}
		// Scheduling is implemented only by the Pro add-on. In Free it is inert.
		if ( empty( $s['maintenance_schedule_enabled'] ) ) {
			return false;
		}
		return (bool) apply_filters( 'qwsc_maintenance_schedule_active', false, $s );
	}

	public function maybe_block() {
		$s = \QWSpeedCache\Plugin::instance()->get_all_settings();
		if ( ! self::is_window_active( $s ) ) {
			return;
		}
		if ( is_admin() || ( defined( 'WP_CLI' ) && WP_CLI ) ) {
			return;
		}
		if ( current_user_can( 'manage_options' ) ) {
			return;
		}
		$status = isset( $s['maintenance_status'] ) && is_scalar( $s['maintenance_status'] ) ? (int) $s['maintenance_status'] : 503;
		if ( $status < 400 || $status > 599 ) {
			$status = 503;
		}
		$msg = isset( $s['maintenance_message'] ) && is_string( $s['maintenance_message'] ) ? $s['maintenance_message'] : __( 'Site under maintenance. Please check back soon.', 'qw-optimize' );
		status_header( $status );
		nocache_headers();
		wp_die( esc_html( $msg ), esc_html__( 'Maintenance', 'qw-optimize' ), array( 'response' => absint( $status ) ) );
	}
}