<?php

declare(strict_types=1);

namespace OCA\WorkflowDeckAutomation\Service;

use OCA\Deck\Db\Card;
use OCA\WorkflowDeckAutomation\AppInfo\Application;
use OCA\WorkflowDeckAutomation\Db\Workflow;
use OCP\App\IAppManager;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IUser;
use OCP\Notification\IManager;
use Psr\Log\LoggerInterface;
use Throwable;

/**
 * Nextcloud notifications (the bell, and from there push to the mobile and
 * desktop clients) — the counterpart to NotificationMailer. Only the raw
 * values are stored here; Notification\Notifier turns them into text when a
 * client fetches the notification.
 *
 * Without the notifications app nothing is sent and nothing is logged as an
 * error: the app is optional, and IManager would just drop the notification.
 */
class NotificationPusher {
	public const SUBJECT_CARD_MOVED = 'card_moved';
	public const SUBJECT_WORKFLOW_DISABLED = 'workflow_disabled';

	public const OBJECT_CARD = 'card';
	public const OBJECT_WORKFLOW = 'workflow';

	private const NOTIFICATIONS_APP = 'notifications';

	public function __construct(
		private IManager $notificationManager,
		private IAppManager $appManager,
		private ITimeFactory $timeFactory,
		private LoggerInterface $logger,
	) {
	}

	public function isAvailableFor(IUser $user): bool {
		try {
			return $this->appManager->isEnabledForUser(self::NOTIFICATIONS_APP, $user);
		} catch (Throwable $e) {
			return false;
		}
	}

	/**
	 * One notification per card, unlike the mail: each one links its card
	 * and can be dismissed on its own. An older notification about the same
	 * card is removed first, so a card that comes back and falls due again
	 * is not listed twice.
	 *
	 * @param non-empty-list<array{workflow: Workflow, card: Card, targets: array{board: string, sourceStack: string, targetStack: string}}> $entries
	 */
	public function sendCardsMovedNotification(IUser $recipient, array $entries): void {
		if (!$this->isAvailableFor($recipient)) {
			return;
		}

		foreach ($entries as $entry) {
			$workflow = $entry['workflow'];
			$card = $entry['card'];
			$targets = $entry['targets'];

			try {
				$this->dismiss($recipient, self::OBJECT_CARD, (string)$card->getId(), self::SUBJECT_CARD_MOVED);

				$notification = $this->notificationManager->createNotification();
				$notification->setApp(Application::APP_ID)
					->setUser($recipient->getUID())
					->setDateTime($this->timeFactory->getDateTime())
					->setObject(self::OBJECT_CARD, (string)$card->getId())
					->setSubject(self::SUBJECT_CARD_MOVED, [
						'cardTitle' => (string)$card->getTitle(),
						'boardId' => $workflow->getBoardId(),
						'boardTitle' => $targets['board'],
						'sourceStackId' => $workflow->getSourceStackId(),
						'sourceStackTitle' => $targets['sourceStack'],
						'targetStackId' => $workflow->getTargetStackId(),
						'targetStackTitle' => $targets['targetStack'],
					]);
				$this->notificationManager->notify($notification);
			} catch (Throwable $e) {
				$this->logger->error('Could not notify ' . $recipient->getUID() . ' about moved card ' . $card->getId() . ': ' . $e->getMessage(), [
					'app' => Application::APP_ID,
					'exception' => $e,
				]);
			}
		}
	}

	/**
	 * Companion to NotificationMailer::sendWorkflowDisabledNotification().
	 *
	 * @param WorkflowRunner::TARGET_* $brokenTarget
	 */
	public function sendWorkflowDisabledNotification(IUser $user, Workflow $workflow, string $brokenTarget): void {
		if (!$this->isAvailableFor($user)) {
			return;
		}

		try {
			$notification = $this->notificationManager->createNotification();
			$notification->setApp(Application::APP_ID)
				->setUser($user->getUID())
				->setDateTime($this->timeFactory->getDateTime())
				->setObject(self::OBJECT_WORKFLOW, (string)$workflow->getId())
				->setSubject(self::SUBJECT_WORKFLOW_DISABLED, [
					'workflowTitle' => (string)$workflow->getTitle(),
					'brokenTarget' => $brokenTarget,
				]);
			$this->notificationManager->notify($notification);
		} catch (Throwable $e) {
			$this->logger->error('Could not notify ' . $user->getUID() . ' about disabled workflow ' . $workflow->getId() . ': ' . $e->getMessage(), [
				'app' => Application::APP_ID,
				'exception' => $e,
			]);
		}
	}

	private function dismiss(IUser $user, string $objectType, string $objectId, string $subject): void {
		$notification = $this->notificationManager->createNotification();
		$notification->setApp(Application::APP_ID)
			->setUser($user->getUID())
			->setObject($objectType, $objectId)
			->setSubject($subject);
		$this->notificationManager->markProcessed($notification);
	}
}