<?php

declare(strict_types=1);

namespace OCA\NuqloudMasterCalendar\DAV;

use OCA\DAV\CalDAV\Integration\ExternalCalendar;
use OCA\DAV\CalDAV\Integration\ICalendarProvider;
use OCA\NuqloudMasterCalendar\AppInfo\Application;
use OCA\NuqloudMasterCalendar\Calendar\SourceCalendarService;
use OCP\IConfig;
use OCP\IL10N;

class MasterCalendarProvider implements ICalendarProvider {
	public function __construct(
		private IConfig $config,
		private SourceCalendarService $sourceCalendars,
		private IL10N $l,
	) {
	}

	public function getAppId(): string {
		return Application::APP_ID;
	}

	/** @return ExternalCalendar[] */
	public function fetchAllForCalendarHome(string $principalUri): array {
		return [$this->newCalendar($principalUri)];
	}

	public function hasCalendarInCalendarHome(string $principalUri, string $calendarUri): bool {
		// CalendarHome already dispatched this provider by its app ID. This provider
		// owns exactly one calendar per principal, so return it even when Sabre has
		// normalized the generated URI before calling us.
		return true;
	}

	public function getCalendarInCalendarHome(string $principalUri, string $calendarUri): ?ExternalCalendar {
		return $this->newCalendar($principalUri);
	}

	private function newCalendar(string $principalUri): MasterCalendar {
		$mode = $this->config->getUserValue(
			$this->userIdFromPrincipal($principalUri),
			Application::APP_ID,
			'source_mode',
			SourceCalendarService::MODE_ALL,
		);
		$mode = $mode === SourceCalendarService::MODE_EDITABLE ? $mode : SourceCalendarService::MODE_ALL;
		return new MasterCalendar($principalUri, $mode, $this->sourceCalendars, $this->l);
	}

	private function userIdFromPrincipal(string $principalUri): string {
		$prefix = 'principals/users/';
		return str_starts_with($principalUri, $prefix) ? substr($principalUri, strlen($prefix)) : $principalUri;
	}
}