<?php
namespace QWSpeedCache\Cache;

defined( 'ABSPATH' ) || exit;

/**
 * Cache debug via query string ?qwsc_debug=1 (admin or secret).
 */
class Debug {

	public function __construct() {
		add_action( 'wp_footer', array( $this, 'footer' ), 99 );
		add_action( 'admin_footer', array( $this, 'footer' ), 99 );
	}

	/**
	 * @return bool
	 */
	public static function active() {
		if ( empty( $_GET['qwsc_debug'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			return false;
		}
		$s = \QWSpeedCache\Plugin::instance()->get_all_settings();
		if ( empty( $s['cache_debug_enabled'] ) ) {
			return false;
		}
		if ( current_user_can( 'manage_options' ) ) {
			return true;
		}
		$secret    = isset( $s['cache_debug_secret'] ) ? (string) $s['cache_debug_secret'] : '';
		$debug_key = isset( $_GET['qwsc_key'] ) ? sanitize_text_field( wp_unslash( $_GET['qwsc_key'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Secret-key authentication, not a state-changing request.
		if ( $secret && '' !== $debug_key && hash_equals( $secret, $debug_key ) ) {
			return true;
		}
		return false;
	}

	public function footer() {
		if ( ! self::active() ) {
			return;
		}
		$st = Status::get();
		$stats = Stats::get();
		$s = \QWSpeedCache\Plugin::instance()->get_all_settings();
		echo "\n<!-- QW Optimize Debug\n";
		echo 'status: ' . esc_html( isset( $st['status'] ) ? $st['status'] : '' ) . "\n";
		echo 'reason: ' . esc_html( isset( $st['reason'] ) ? $st['reason'] : '' ) . "\n";
		echo 'backend: ' . esc_html( PageStore::backend( $s ) ) . "\n";
		echo 'hits: ' . (int) $stats['hits'] . ' misses: ' . (int) $stats['misses'] . ' rate: ' . esc_html( (string) Stats::hit_rate() ) . "%\n";
		echo "-->\n";
	}
}