/**
 * Notification service - stores and manages notifications in IndexedDB
 */

import { createIndexedDBHelper, type IndexedDBHelper } from './helpers/indexedDBHelper'

const DB_NAME = 'nostr_notifications'
const DB_VERSION = 1
const STORE_NAME = 'notifications'

export type NotificationType =
  | 'purchase' // Achat
  | 'review' // Avis
  | 'sponsoring' // Sponsoring
  | 'review_tip' // Remerciement (tip sur un avis)
  | 'payment_note' // Note de paiement
  | 'published' // Objet publié avec succès (passé de published: false à liste de relais)

export interface Notification {
  id: string // Unique notification ID
  type: NotificationType
  objectType: string // Type d'objet (author, series, publication, etc.)
  objectId: string // ID de l'objet dans objectCache
  eventId: string // ID de l'événement Nostr
  timestamp: number // Date de création de la notification (milliseconds)
  read: boolean // Si la notification a été lue
  data?: Record<string, unknown> // Données supplémentaires (relais publiés, montant, etc.)
  // Compatibilité avec l'ancien format
  title?: string
  message?: string
  articleId?: string
  articleTitle?: string
  amount?: number
  fromPubkey?: string
}

class NotificationService {
  private readonly dbHelper: IndexedDBHelper

  constructor() {
    this.dbHelper = createIndexedDBHelper({
      dbName: DB_NAME,
      version: DB_VERSION,
      storeName: STORE_NAME,
      keyPath: 'id',
      indexes: [
        { name: 'type', keyPath: 'type', unique: false },
        { name: 'objectId', keyPath: 'objectId', unique: false },
        { name: 'eventId', keyPath: 'eventId', unique: false },
        { name: 'timestamp', keyPath: 'timestamp', unique: false },
        { name: 'read', keyPath: 'read', unique: false },
        { name: 'objectType', keyPath: 'objectType', unique: false },
      ],
    })
  }

  /**
   * Create a new notification
   * Utilise writeService pour écrire via Web Worker
   */
  async createNotification(params: {
    type: NotificationType
    objectType: string
    objectId: string
    eventId: string
    data?: Record<string, unknown>
  }): Promise<void> {
    try {
      const { type, objectType, objectId, eventId, data } = params
      // Check if notification already exists for this event
      const existing = await this.getNotificationByEventId(eventId)
      if (existing) {
        return // Notification already exists
      }

      // Utiliser writeService pour créer la notification via Web Worker
      const { writeService } = await import('./writeService')
      await writeService.createNotification(type, objectType, objectId, eventId, data)
    } catch (error) {
      console.error('[NotificationService] Error creating notification:', error)
    }
  }

  /**
   * Get notification by event ID
   */
  async getNotificationByEventId(eventId: string): Promise<Notification | null> {
    try {
      return await this.dbHelper.getByIndex<Notification>('eventId', eventId)
    } catch (error) {
      console.error('[NotificationService] Error getting notification by event ID:', error)
      return null
    }
  }

  /**
   * Get all notifications for a user
   */
  async getAllNotifications(limit: number = 100): Promise<Notification[]> {
    try {
      const notifications: Notification[] = []
      const store = await this.dbHelper.getStore('readonly')
      const index = store.index('timestamp')

      return new Promise<Notification[]>((resolve, reject) => {
        const request = index.openCursor(null, 'prev') // Descending order (newest first)

        request.onsuccess = (event: globalThis.Event): void => {
          const cursor = (event.target as IDBRequest<IDBCursorWithValue>).result
          if (cursor) {
            notifications.push(cursor.value as Notification)
            if (notifications.length < limit) {
              cursor.continue()
            } else {
              resolve(notifications)
            }
          } else {
            resolve(notifications)
          }
        }

        request.onerror = (): void => {
          if (request.error) {
            reject(request.error)
          } else {
            reject(new Error('Unknown error opening cursor'))
          }
        }
      })
    } catch (error) {
      console.error('[NotificationService] Error getting all notifications:', error)
      return []
    }
  }

  /**
   * Get unread notifications count
   */
  async getUnreadCount(): Promise<number> {
    try {
      return await this.dbHelper.countByIndex('read', IDBKeyRange.only(false))
    } catch (error) {
      console.error('[NotificationService] Error getting unread count:', error)
      return 0
    }
  }

  /**
   * Mark notification as read
   */
  async markAsRead(notificationId: string): Promise<void> {
    try {
      const notification = await this.dbHelper.get<Notification>(notificationId)
      if (!notification) {
        throw new Error('Notification not found')
      }

      const updatedNotification: Notification = {
        ...notification,
        read: true,
      }

      await this.dbHelper.put(updatedNotification)
    } catch (error) {
      console.error('[NotificationService] Error marking notification as read:', error)
      throw error
    }
  }

  /**
   * Mark all notifications as read
   */
  async markAllAsRead(): Promise<void> {
    try {
      const notifications = await this.getAllNotifications(10000)
      const unreadNotifications = notifications.filter((n) => !n.read)

      await Promise.all(
        unreadNotifications.map((notification) => {
          const updatedNotification: Notification = {
            ...notification,
            read: true,
          }
          return this.dbHelper.put(updatedNotification)
        })
      )
    } catch (error) {
      console.error('[NotificationService] Error marking all notifications as read:', error)
      throw error
    }
  }

  /**
   * Delete notification
   */
  async deleteNotification(notificationId: string): Promise<void> {
    try {
      await this.dbHelper.delete(notificationId)
    } catch (error) {
      console.error('[NotificationService] Error deleting notification:', error)
      throw error
    }
  }
}

export const notificationService = new NotificationService()