import notifee, { AndroidImportance, AuthorizationStatus } from '@notifee/react-native';
import { NotificationChannel, UpdateableNotification, UpdateableNotificationOptions } from './types';

interface NotificationInstance {
  lastUpdateTime: number;
}

class NotificationService {
  private static notificationInstances = new Map<string, NotificationInstance>();

  public static async requestNotificationPermission(): Promise<boolean> {
    const settings = await notifee.requestPermission();
    return settings.authorizationStatus === AuthorizationStatus.AUTHORIZED;
  }

  public async showNotification(
    title: string,
    body: string,
    channelType: NotificationChannel = NotificationChannel.DEFAULT,
    asForegroundService = false,
  ): Promise<void> {
    try {
      const hasPermission = await NotificationService.requestNotificationPermission();
      if (!hasPermission) return;

      const channelId = await notifee.createChannel({
        id: channelType,
        name: channelType,
        importance: asForegroundService ? AndroidImportance.HIGH : AndroidImportance.DEFAULT,
      });

      await notifee.displayNotification({
        title,
        body,
        android: {
          channelId,
          importance: asForegroundService ? AndroidImportance.HIGH : AndroidImportance.DEFAULT,
          ongoing: asForegroundService,
          asForegroundService,
          pressAction: {
            id: 'default',
          },
        },
        ios: {
          // iOS specific options
          foregroundPresentationOptions: {
            badge: true,
            sound: true,
            banner: true,
            list: true,
          },
        },
      });
    } catch (error) {
      console.error('Fehler beim Anzeigen der Benachrichtigung:', error);
    }
  }

  public async stopForegroundService(): Promise<void> {
    try {
      await notifee.stopForegroundService();
    } catch (error) {
      console.error('Fehler beim Stoppen des Foreground-Services:', error);
    }
  }

  public createUpdateableNotification(instanceId: string): UpdateableNotification {
    if (!NotificationService.notificationInstances.has(instanceId)) {
      NotificationService.notificationInstances.set(instanceId, {
        lastUpdateTime: 0,
      });
    }

    const update = async (
      title: string,
      message: string,
      options: UpdateableNotificationOptions = {},
    ): Promise<void> => {
      const {
        minUpdateInterval = 1000,
        requireInteraction = true,
        silent = true,
      } = options;

      try {
        const hasPermission = await NotificationService.requestNotificationPermission();
        if (!hasPermission) return;

        const instance = NotificationService.notificationInstances.get(instanceId)!;
        const now = Date.now();

        if (now - instance.lastUpdateTime >= minUpdateInterval) {
          const channelId = await notifee.createChannel({
            id: instanceId,
            name: 'Default Channel',
            importance: AndroidImportance.DEFAULT,
          });

          await notifee.displayNotification({
            id: instanceId,
            title,
            body: message,
            android: {
              channelId,
              importance: AndroidImportance.DEFAULT,
              ongoing: requireInteraction,
              pressAction: {
                id: 'default',
              },
            },
            ios: {
              // iOS specific options
              foregroundPresentationOptions: {
                badge: !silent,
                sound: !silent,
                banner: true,
                list: true,
              },
            },
          });

          instance.lastUpdateTime = now;
        }
      } catch (error) {
        console.error('Fehler beim Aktualisieren der Benachrichtigung:', error);
      }
    };

    const finish = async (title: string, message: string): Promise<void> => {
      NotificationService.notificationInstances.delete(instanceId);
      await notifee.cancelNotification(instanceId);
      const channelId = await notifee.createChannel({
        id: 'default',
        name: 'Default Channel',
        importance: AndroidImportance.DEFAULT,
      });
      await notifee.displayNotification({
        title,
        body: message,
        android: {
          channelId,
          importance: AndroidImportance.DEFAULT,
        },
        ios: {
          foregroundPresentationOptions: {
            badge: true,
            sound: true,
            banner: true,
            list: true,
          },
        },
      });
    };

    const error = async (title: string, message: string): Promise<void> => {
      NotificationService.notificationInstances.delete(instanceId);
      await notifee.cancelNotification(instanceId);
      const channelId = await notifee.createChannel({
        id: 'default',
        name: 'Default Channel',
        importance: AndroidImportance.HIGH,
      });
      await notifee.displayNotification({
        title,
        body: message,
        android: {
          channelId,
          importance: AndroidImportance.HIGH,
        },
        ios: {
          foregroundPresentationOptions: {
            badge: true,
            sound: true,
            banner: true,
            list: true,
          },
        },
      });
    };

    return {
      update,
      finish,
      error,
    };
  }
}

// Standard-Export der Instanz
export default new NotificationService();

// Benannter Export der statischen Methode
export const { requestNotificationPermission } = NotificationService;