<?php

declare(strict_types=1);

namespace LinkCheckup\Features\Maintenance;

use LinkCheckup\Shared\Jobs\JobTask;
use LinkCheckup\Shared\Settings\Settings;
use LinkCheckup\Shared\Settings\SettingsStore;
use LinkCheckup\Shared\Time\Clock;
use RuntimeException;

use function is_string;

final class MailReportTask implements JobTask {

	private const ADMIN_EMAIL_OPTION = 'admin_email';

	public function __construct(
		private SettingsStore $settings_store,
		private NewBrokenLinks $new_broken_links,
		private LastReportTime $last_report_time,
		private BrokenLinksReport $broken_links_report,
		private MailSender $mail_sender,
		private Clock $clock
	) {
	}

	public function run(): int {
		$settings = $this->settings_store->load();

		if ( ! $settings->email_enabled ) {
			return 0;
		}

		$reported_at = $this->clock->now();
		$links       = $this->new_broken_links->since(
			$this->last_report_time->load()
		);

		if ( array() === $links ) {
			return 0;
		}

		$is_sent = $this->mail_sender->send(
			$this->recipient( $settings ),
			$this->broken_links_report->subject(),
			$this->broken_links_report->body( $links )
		);

		if ( ! $is_sent ) {
			throw new RuntimeException(
				'The broken links report was not sent.'
			);
		}

		$this->last_report_time->save( $reported_at );

		return count( $links );
	}

	private function recipient( Settings $settings ): string {
		if ( '' !== $settings->email_to ) {
			return $settings->email_to;
		}

		$admin_email = get_option( self::ADMIN_EMAIL_OPTION );

		if ( ! is_string( $admin_email ) ) {
			throw new RuntimeException(
				'The site has no administrator email address.'
			);
		}

		return $admin_email;
	}
}