<?php

declare(strict_types=1);

namespace OCA\F7Push\Service;

use OCA\F7Push\Db\Device;
use OCA\F7Push\Db\DeviceMapper;
use OCA\F7Push\Model\PushMessage;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\Notification\INotification;
use Psr\Log\LoggerInterface;

class PushDispatcher {
	public function __construct(
		private DeviceMapper $deviceMapper,
		private FirebaseClient $firebaseClient,
		private ConfigService $config,
		private ITimeFactory $timeFactory,
		private LoggerInterface $logger,
	) {
	}

	public function registerDevice(
		string $userId,
		string $deviceId,
		string $fcmToken,
		string $platform,
		string $clientApp,
	): Device {
		$now = $this->timeFactory->getTime();
		try {
			$device = $this->deviceMapper->findByUserAndDevice($userId, $deviceId);
			$device->setFcmToken($fcmToken);
			$device->setPlatform($platform);
			$device->setClientApp($clientApp);
			$device->setLastSeen($now);
			return $this->deviceMapper->update($device);
		} catch (DoesNotExistException) {
			$device = new Device();
			$device->setUserId($userId);
			$device->setDeviceId($deviceId);
			$device->setFcmToken($fcmToken);
			$device->setPlatform($platform);
			$device->setClientApp($clientApp);
			$device->setCreatedAt($now);
			$device->setLastSeen($now);
			return $this->deviceMapper->insert($device);
		}
	}

	public function unregisterDevice(string $userId, string $deviceId): void {
		$this->deviceMapper->deleteByUserAndDevice($userId, $deviceId);
	}

	/**
	 * @return Device[]
	 */
	public function listDevices(string $userId): array {
		return $this->deviceMapper->findByUser($userId);
	}

	public function dispatch(PushMessage $message): int {
		if (!$this->config->isEnabled()) {
			return 0;
		}
		if (!$this->config->isSourceEnabled($message->source)) {
			return 0;
		}

		$devices = $this->deviceMapper->findByUser($message->userId);
		if ($devices === []) {
			return 0;
		}

		$url = $message->url ?? $this->config->getDefaultClickUrl();
		$sent = 0;
		foreach ($devices as $device) {
			$token = $device->getFcmToken();
			if ($token === '') {
				continue;
			}
			if ($this->firebaseClient->sendToToken($token, $message->title, $message->body, $url, $message->priority)) {
				$sent++;
			}
		}

		$this->logger->debug('f7push: dispatched push', [
			'app' => 'f7push',
			'user' => $message->userId,
			'source' => $message->source,
			'sent' => $sent,
			'devices' => count($devices),
		]);

		return $sent;
	}

	public function dispatchFromNotification(INotification $notification): int {
		if (!$this->config->listenNotifications()) {
			return 0;
		}

		$user = $notification->getUser();
		if ($user === null || $user === '') {
			return 0;
		}

		$source = $notification->getApp();
		if (!$this->config->isSourceEnabled($source)) {
			return 0;
		}

		$title = $notification->getParsedSubject();
		if ($title === '') {
			$title = $notification->getSubject();
		}
		$body = $notification->getParsedMessage();
		if ($body === '') {
			$body = $notification->getMessage();
		}
		if ($title === '' && $body === '') {
			return 0;
		}
		if ($title === '') {
			$title = $body;
		}

		$link = $notification->getLink();
		if ($link !== '' && !str_starts_with($link, 'http://') && !str_starts_with($link, 'https://')) {
			$link = $this->config->getDefaultClickUrl() . $link;
		}

		$priority = $source === 'spreed' ? 'high' : 'normal';

		return $this->dispatch(new PushMessage(
			userId: $user,
			title: $title,
			body: $body,
			source: $source,
			priority: $priority,
			url: $link !== '' ? $link : null,
		));
	}
}