<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Handles the scheduled weekly scan and its email summary.
 */
class CGARD_Cron {

	public function __construct() {
		add_action( CGARD_CRON_HOOK, array( $this, 'run_scheduled_scan' ) );
	}

	public function run_scheduled_scan() {
		// Snapshot of what was open BEFORE this run, so we can tell the admin
		// what's new rather than re-listing everything every week.
		$previously_open_keys = wp_list_pluck( CGARD_Db::get_findings( 'open' ), 'check_key' );

		$findings = CGARD_Scanner::run();

		$new_findings = array_filter(
			$findings,
			function ( $finding ) use ( $previously_open_keys ) {
				return ! in_array( $finding['check_key'], $previously_open_keys, true );
			}
		);

		$this->send_summary_email( $findings, $new_findings );
	}

	private function send_summary_email( array $all_findings, array $new_findings ) {
		$to      = get_option( 'admin_email' );
		$site    = get_bloginfo( 'name' );
		$subject = sprintf( '[%s] Weekly security scan: %d open issue(s)', $site, count( $all_findings ) );

		if ( empty( $all_findings ) ) {
			$body = "Good news — your weekly scan found no open security issues on {$site}.\n";
		} else {
			$body  = sprintf( "Your weekly scan of %s found %d open issue(s).\n\n", $site, count( $all_findings ) );

			if ( ! empty( $new_findings ) ) {
				$body .= "NEW since last scan:\n";
				foreach ( $new_findings as $finding ) {
					$body .= sprintf( "- [%s] %s\n", strtoupper( $finding['severity'] ), $finding['title'] );
				}
				$body .= "\n";
			}

			$body .= sprintf(
				"View the full report and fix steps: %s\n",
				admin_url( 'admin.php?page=clarityguard' )
			);
		}

		wp_mail( $to, $subject, $body );
	}
}