story-research-zapwall/lib/articlePublisher.ts

import { nostrService } from './nostr'
import type { AlbyInvoice } from '@/types/alby'
import type { SimplePoolWithSub } from '@/types/nostr-tools-extended'
import type { MediaRef } from '@/types/nostr'
import {
  storePrivateContent,
  getStoredPrivateContent,
  getStoredInvoice,
  removeStoredPrivateContent,
} from './articleStorage'
import { createArticleInvoice, createPreviewEvent } from './articleInvoice'
import { buildPresentationEvent, fetchAuthorPresentationFromPool, sendEncryptedContent } from './articlePublisherHelpers'

export interface ArticleDraft {
  title: string
  preview: string
  content: string // Full content that will be sent as private message after payment
  zapAmount: number
  category?: 'science-fiction' | 'scientific-research'
  seriesId?: string
  bannerUrl?: string
  media?: MediaRef[]
}

export interface AuthorPresentationDraft {
  title: string
  preview: string
  content: string
  presentation: string
  contentDescription: string
  mainnetAddress: string
}

export interface PublishedArticle {
  articleId: string
  previewEventId: string
  invoice?: AlbyInvoice // Invoice created by author (required if success)
  success: boolean
  error?: string
}

/**
 * Service for publishing articles on Nostr
 * Handles publishing preview (public note), creating invoice, and storing full content for later private message
 */
export class ArticlePublisher {
  private readonly siteTag = process.env.NEXT_PUBLIC_SITE_TAG ?? 'zapwall4science'

  private buildFailure(error?: string): PublishedArticle {
    const base: PublishedArticle = {
      articleId: '',
      previewEventId: '',
      success: false,
    }
    return error ? { ...base, error } : base
  }

  private prepareAuthorKeys(authorPubkey: string, authorPrivateKey?: string): { success: boolean; error?: string } {
    nostrService.setPublicKey(authorPubkey)

    if (authorPrivateKey) {
      nostrService.setPrivateKey(authorPrivateKey)
      return { success: true }
    }

    const existingPrivateKey = nostrService.getPrivateKey()
    if (!existingPrivateKey) {
      return {
        success: false,
        error:
          'Private key required for signing. Please connect with a Nostr wallet that provides signing capabilities.',
      }
    }

    return { success: true }
  }

  private isValidCategory(category?: ArticleDraft['category']): category is NonNullable<ArticleDraft['category']> {
    return category === 'science-fiction' || category === 'scientific-research'
  }

  private async publishPreview(
    draft: ArticleDraft,
    invoice: AlbyInvoice,
    presentationId: string,
    extraTags?: string[][]
  ): Promise<import('nostr-tools').Event | null> {
    const previewEvent = createPreviewEvent(draft, invoice, presentationId, extraTags)
    const publishedEvent = await nostrService.publishEvent(previewEvent)
    return publishedEvent ?? null
  }

  private buildArticleExtraTags(draft: ArticleDraft, category: NonNullable<ArticleDraft['category']>): string[][] {
    const extraTags: string[][] = [
      ['kind_type', 'article'],
      ['site', this.siteTag],
      ['category', category],
    ]
    if (draft.seriesId) {
      extraTags.push(['series', draft.seriesId])
    }
    if (draft.bannerUrl) {
      extraTags.push(['banner', draft.bannerUrl])
    }
    if (draft.media && draft.media.length > 0) {
      draft.media.forEach((m) => {
        extraTags.push(['media', m.url, m.type])
      })
    }
    return extraTags
  }

  /**
   * Publish an article preview as a public note (kind:1)
   * Creates a Lightning invoice for the article
   * The full content will be sent as encrypted private message after payment
   */
  async publishArticle(
    draft: ArticleDraft,
    authorPubkey: string,
    authorPrivateKey?: string
  ): Promise<PublishedArticle> {
    try {
      const keySetup = this.prepareAuthorKeys(authorPubkey, authorPrivateKey)
      if (!keySetup.success) {
        return this.buildFailure(keySetup.error)
      }

      const presentation = await this.getAuthorPresentation(authorPubkey)
      if (!presentation) {
        return this.buildFailure('Vous devez créer un article de présentation avant de publier des articles.')
      }

      if (!this.isValidCategory(draft.category)) {
        return this.buildFailure('Vous devez sélectionner une catégorie (science-fiction ou recherche scientifique).')
      }
      const category = draft.category

      const invoice = await createArticleInvoice(draft)
      const extraTags = this.buildArticleExtraTags(draft, category)
      const publishedEvent = await this.publishPreview(draft, invoice, presentation.id, extraTags)
      if (!publishedEvent) {
        return this.buildFailure('Failed to publish article')
      }

      await storePrivateContent(publishedEvent.id, draft.content, authorPubkey, invoice)

      return { articleId: publishedEvent.id, previewEventId: publishedEvent.id, invoice, success: true }
    } catch (error) {
      console.error('Error publishing article:', error)
      return this.buildFailure(error instanceof Error ? error.message : 'Unknown error')
    }
  }

  /**
   * Update an existing article by publishing a new event that references the original
   */
  /**
   * Get stored private content for an article
   */
  getStoredPrivateContent(articleId: string): Promise<{
    content: string
    authorPubkey: string
    invoice?: AlbyInvoice
  } | null> {
    return getStoredPrivateContent(articleId)
  }

  /**
   * Get stored invoice for an article
   */
  getStoredInvoice(articleId: string): Promise<AlbyInvoice | null> {
    return getStoredInvoice(articleId)
  }

  /**
   * Send private content to a user after payment confirmation
   */
  async sendPrivateContent(
    articleId: string,
    recipientPubkey: string,
    authorPrivateKey: string
  ): Promise<boolean> {
    try {
      const stored = await getStoredPrivateContent(articleId)
      if (!stored) {
        console.error('Private content not found for article:', articleId)
        return false
      }

      const sent = await sendEncryptedContent(articleId, recipientPubkey, stored, authorPrivateKey)
      return sent
    } catch (error) {
      console.error('Error sending private content:', error)
      return false
    }
  }

  /**
   * Remove stored private content (after successful send or expiry)
   */
  async removeStoredPrivateContent(articleId: string): Promise<void> {
    await removeStoredPrivateContent(articleId)
  }

  /**
   * Publish an author presentation article (obligatory for all authors)
   * This article is free and contains the author's presentation, content description, and mainnet address
   */
  async publishPresentationArticle(
    draft: AuthorPresentationDraft,
    authorPubkey: string,
    authorPrivateKey: string
  ): Promise<PublishedArticle> {
    try {
      nostrService.setPublicKey(authorPubkey)
      nostrService.setPrivateKey(authorPrivateKey)

      const publishedEvent = await nostrService.publishEvent(buildPresentationEvent(draft))

      if (!publishedEvent) {
        return this.buildFailure('Failed to publish presentation article')
      }

      return {
        articleId: publishedEvent.id,
        previewEventId: publishedEvent.id,
        success: true,
      }
    } catch (error) {
      console.error('Error publishing presentation article:', error)
      return this.buildFailure(error instanceof Error ? error.message : 'Unknown error')
    }
  }

  async getAuthorPresentation(pubkey: string): Promise<import('@/types/nostr').AuthorPresentationArticle | null> {
    try {
      const pool = nostrService.getPool()
      if (!pool) {
        return null
      }
      return await fetchAuthorPresentationFromPool(pool as SimplePoolWithSub, pubkey)
    } catch (error) {
      console.error('Error getting author presentation:', error)
      return null
    }
  }
}

export const articlePublisher = new ArticlePublisher()