<?php

declare(strict_types=1);

namespace OCA\WorkflowDeckAutomation\Notification;

use OCA\WorkflowDeckAutomation\AppInfo\Application;
use OCA\WorkflowDeckAutomation\Service\NotificationMailer;
use OCA\WorkflowDeckAutomation\Service\NotificationPusher;
use OCA\WorkflowDeckAutomation\Service\TriggerDate;
use OCP\IURLGenerator;
use OCP\Notification\INotification;
use OCP\Notification\INotifier;
use OCP\Notification\UnknownNotificationException;

/**
 * Turns the values NotificationPusher stored into text. German only, like
 * the rest of the app — the language Nextcloud asks for is ignored.
 *
 * Deliberately asks Deck nothing: the stored titles are the ones from the
 * moment the card moved, and a Deck lookup here would run as whoever
 * happens to fetch notifications (see CLAUDE.md on Deck's frozen uid).
 */
class Notifier implements INotifier {
	public function __construct(
		private IURLGenerator $urlGenerator,
	) {
	}

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

	public function getName(): string {
		return 'Deck Workflow-Automatisierung';
	}

	public function prepare(INotification $notification, string $languageCode): INotification {
		if ($notification->getApp() !== Application::APP_ID) {
			throw new UnknownNotificationException();
		}

		$notification->setIcon($this->urlGenerator->getAbsoluteURL($this->urlGenerator->imagePath(Application::APP_ID, 'app-dark.svg')));
		$params = $notification->getSubjectParameters();

		switch ($notification->getSubject()) {
			case NotificationPusher::SUBJECT_CARD_MOVED:
				$this->prepareCardMoved($notification, $params);
				return $notification;
			case NotificationPusher::SUBJECT_WORKFLOW_DISABLED:
				$this->prepareWorkflowDisabled($notification, $params);
				return $notification;
			default:
				throw new UnknownNotificationException();
		}
	}

	private function prepareCardMoved(INotification $notification, array $params): void {
		$cardId = $notification->getObjectId();
		$boardId = (string)($params['boardId'] ?? '');
		$boardTitle = (string)($params['boardTitle'] ?? '');
		$targetStackTitle = (string)($params['targetStackTitle'] ?? '');
		$cardUrl = $this->urlGenerator->getAbsoluteURL('/apps/deck/board/' . $boardId . '/card/' . $cardId);

		// Every title is user input and goes in as a rich object, never into
		// the template itself — a title containing "{…}" would otherwise be
		// read as a placeholder.
		$objects = [
			'deck-card' => [
				'type' => 'deck-card',
				'id' => $cardId,
				'name' => (string)($params['cardTitle'] ?? ''),
				'boardname' => $boardTitle,
				'stackname' => $targetStackTitle,
				'link' => $cardUrl,
			],
			'deck-board' => [
				'type' => 'deck-board',
				'id' => $boardId,
				'name' => $boardTitle,
				'link' => $this->urlGenerator->getAbsoluteURL('/apps/deck/board/' . $boardId),
			],
			'source-stack' => [
				'type' => 'highlight',
				'id' => (string)($params['sourceStackId'] ?? ''),
				'name' => (string)($params['sourceStackTitle'] ?? ''),
			],
			'target-stack' => [
				'type' => 'highlight',
				'id' => (string)($params['targetStackId'] ?? ''),
				'name' => $targetStackTitle,
			],
		];

		$notification->setLink($cardUrl);
		self::setText(
			$notification,
			'{deck-card} wurde nach {target-stack} verschoben',
			sprintf(
				'Die Karte auf {deck-board} %s und wurde automatisch von {source-stack} nach {target-stack} verschoben.',
				// Missing on notifications from before the start date existed,
				// which were all about due dates.
				TriggerDate::describeReason((string)($params['triggerDate'] ?? TriggerDate::DUE)),
			),
			$objects,
		);
	}

	private function prepareWorkflowDisabled(INotification $notification, array $params): void {
		$settingsUrl = $this->urlGenerator->getAbsoluteURL('/settings/user/' . Application::APP_ID);

		$objects = [
			'workflow' => [
				'type' => 'highlight',
				'id' => $notification->getObjectId(),
				'name' => (string)($params['workflowTitle'] ?? ''),
				'link' => $settingsUrl,
			],
		];

		$notification->setLink($settingsUrl);
		self::setText(
			$notification,
			'Workflow {workflow} wurde deaktiviert',
			sprintf(
				'Er wurde automatisch ausgeschaltet, weil %s, und verschiebt keine Karten mehr. Lösche ihn oder stelle ein vorhandenes Board und vorhandene Stapel ein, um ihn wieder zu aktivieren.',
				NotificationMailer::describeBrokenTarget((string)($params['brokenTarget'] ?? '')),
			),
			$objects,
		);
	}

	/**
	 * Sets the rich texts and their plain fallback (used by clients without
	 * rich text support), with titles in German quotes there.
	 *
	 * @param array<string, array{name: string}> $objects
	 */
	private static function setText(INotification $notification, string $subject, string $message, array $objects): void {
		$plain = [];
		foreach ($objects as $key => $object) {
			$plain['{' . $key . '}'] = '„' . $object['name'] . '“';
		}

		// strtr() replaces in a single pass, so a title that itself contains
		// a placeholder is left as it is.
		$notification->setParsedSubject(strtr($subject, $plain))
			->setRichSubject($subject, $objects)
			->setParsedMessage(strtr($message, $plain))
			->setRichMessage($message, $objects);
	}
}