/**
 * Write service - manages all write operations to IndexedDB
 * Routes writes through Web Worker for IndexedDB operations
 * Routes network operations through WebSocket service
 */

import type { NostrEvent } from 'nostr-tools'
import type { ObjectType } from './objectCache'

class WriteService {
  private writeWorker: Worker | null = null
  private initPromise: Promise<void> | null = null

  /**
   * Initialize the write worker
   */
  private async init(): Promise<void> {
    if (this.writeWorker) {
      return
    }

    if (this.initPromise) {
      return this.initPromise
    }

    this.initPromise = this.createWorker()

    try {
      await this.initPromise
    } catch (error) {
      this.initPromise = null
      throw error
    }
  }

  private createWorker(): Promise<void> {
    return new Promise((resolve, reject) => {
      if (typeof window === 'undefined' || !window.Worker) {
        // Fallback: write directly if Worker not available
        console.warn('[WriteService] Web Workers not available, using direct writes')
        resolve()
        return
      }

      try {
        // Worker dans public/ pour Next.js
        this.writeWorker = new Worker('/writeWorker.js', { type: 'classic' })

        this.writeWorker.addEventListener('message', (event) => {
          const { type, data } = event.data
          if (type === 'ERROR') {
            console.error('[WriteService] Worker error:', data)
          }
        })

        this.writeWorker.addEventListener('error', (error) => {
          console.error('[WriteService] Worker error:', error)
          // Ne pas rejeter, utiliser fallback
          console.warn('[WriteService] Falling back to direct writes')
          this.writeWorker = null
          resolve()
        })

        // Attendre que le worker soit prêt
        const readyTimeout = setTimeout(() => {
          console.warn('[WriteService] Worker ready timeout, using direct writes')
          if (this.writeWorker) {
            this.writeWorker.terminate()
            this.writeWorker = null
          }
          resolve()
        }, 2000)

        // Le worker est prêt quand il répond
        const readyHandler = (event: MessageEvent): void => {
          if (event.data?.type === 'WORKER_READY') {
            clearTimeout(readyTimeout)
            this.writeWorker?.removeEventListener('message', readyHandler)
            resolve()
          }
        }

        this.writeWorker.addEventListener('message', readyHandler)
      } catch (error) {
        console.warn('[WriteService] Failed to create worker, using direct writes:', error)
        resolve() // Fallback to direct writes
      }
    })
  }

  /**
   * Write object to IndexedDB (via Web Worker)
   */
  async writeObject(
    objectType: ObjectType,
    hash: string,
    event: NostrEvent,
    parsed: unknown,
    version: number,
    hidden: boolean,
    index?: number,
    published: false | string[] = false
  ): Promise<void> {
    try {
      await this.init()

      if (this.writeWorker) {
        // Send to worker
        return new Promise((resolve, reject) => {
          const timeout = setTimeout(() => {
            reject(new Error('Write operation timeout'))
          }, 10000)

          const handler = (event: MessageEvent): void => {
            const { type, data } = event.data
            if (type === 'WRITE_OBJECT_SUCCESS' && data.hash === hash) {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              resolve()
            } else if (type === 'ERROR' && data.originalType === 'WRITE_OBJECT') {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              reject(new Error(data.error))
            }
          }

          this.writeWorker!.addEventListener('message', handler)
          this.writeWorker!.postMessage({
            type: 'WRITE_OBJECT',
            data: {
              objectType,
              hash,
              event,
              parsed,
              version,
              hidden,
              index,
              published,
            },
          })
        })
      }
        // Fallback: direct write
        const { objectCache } = await import('./objectCache')
        await objectCache.set(objectType, hash, event, parsed, version, hidden, index, published)

    } catch (error) {
      console.error('[WriteService] Error writing object:', error)
      throw error
    }
  }

  /**
   * Update published status (via Web Worker)
   */
  async updatePublished(
    objectType: ObjectType,
    id: string,
    published: false | string[]
  ): Promise<void> {
    try {
      await this.init()

      if (this.writeWorker) {
        // Send to worker
        return new Promise((resolve, reject) => {
          const timeout = setTimeout(() => {
            reject(new Error('Update published operation timeout'))
          }, 10000)

          const handler = (event: MessageEvent): void => {
            const { type, data } = event.data
            if (type === 'UPDATE_PUBLISHED_SUCCESS' && data.id === id) {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              resolve()
            } else if (type === 'ERROR' && (data.originalType === 'UPDATE_PUBLISHED' || data.taskId?.startsWith('UPDATE_PUBLISHED'))) {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              reject(new Error(data.error))
            }
          }

          this.writeWorker!.addEventListener('message', handler)
          this.writeWorker!.postMessage({
            type: 'UPDATE_PUBLISHED',
            data: { objectType, id, published },
          })
        })
      }
        // Fallback: direct write
        const { objectCache } = await import('./objectCache')
        await objectCache.updatePublished(objectType, id, published)

    } catch (error) {
      console.error('[WriteService] Error updating published status:', error)
      throw error
    }
  }

  /**
   * Create notification (via Web Worker)
   */
  async createNotification(
    type: string,
    objectType: string,
    objectId: string,
    eventId: string,
    data?: Record<string, unknown>
  ): Promise<void> {
    try {
      await this.init()

      if (this.writeWorker) {
        // Send to worker
        return new Promise((resolve, reject) => {
          const timeout = setTimeout(() => {
            reject(new Error('Create notification operation timeout'))
          }, 10000)

          const handler = (event: MessageEvent): void => {
            const { type: responseType, data: responseData } = event.data
            if (responseType === 'CREATE_NOTIFICATION_SUCCESS' && responseData.eventId === eventId) {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              resolve()
            } else if (responseType === 'ERROR' && (responseData.originalType === 'CREATE_NOTIFICATION' || responseData.taskId?.startsWith('CREATE_NOTIFICATION'))) {
              clearTimeout(timeout)
              this.writeWorker?.removeEventListener('message', handler)
              reject(new Error(responseData.error))
            }
          }

          this.writeWorker!.addEventListener('message', handler)
          this.writeWorker!.postMessage({
            type: 'CREATE_NOTIFICATION',
            data: { type, objectType, objectId, eventId, notificationData: data },
          })
        })
      }
        // Fallback: direct write
        const { notificationService } = await import('./notificationService')
        await notificationService.createNotificationDirect(
          type as Parameters<typeof notificationService.createNotificationDirect>[0],
          objectType,
          objectId,
          eventId,
          data
        )

    } catch (error) {
      console.error('[WriteService] Error creating notification:', error)
      throw error
    }
  }

  /**
   * Log publication (via Web Worker)
   */
  async logPublication(
    eventId: string,
    relayUrl: string,
    success: boolean,
    error?: string,
    objectType?: string,
    objectId?: string
  ): Promise<void> {
    try {
      await this.init()

      if (this.writeWorker) {
        // Send to worker
        this.writeWorker.postMessage({
          type: 'LOG_PUBLICATION',
          data: { eventId, relayUrl, success, error, objectType, objectId },
        })
        // Don't wait for response for logs (fire and forget)
      } else {
        // Fallback: direct write
        const { publishLog } = await import('./publishLog')
        await publishLog.logPublicationDirect(eventId, relayUrl, success, error, objectType, objectId)
      }
    } catch (error) {
      console.error('[WriteService] Error logging publication:', error)
      // Don't throw for logs
    }
  }

  /**
   * Terminate the worker
   */
  terminate(): void {
    if (this.writeWorker) {
      this.writeWorker.terminate()
      this.writeWorker = null
      this.initPromise = null
    }
  }
}

export const writeService = new WriteService()