story-research-zapwall/lib/articleInvoice.ts

import { getAlbyService } from './alby'
import { calculateArticleSplit, PLATFORM_COMMISSIONS } from './platformCommissions'
import { buildTags } from './nostrTagSystem'
import { PLATFORM_SERVICE } from './platformConfig'
import { generatePublicationHashId } from './hashIdGenerator'
import type { AlbyInvoice } from '@/types/alby'
import type { ArticleDraft } from './articlePublisher'

/**
 * Create Lightning invoice for article with automatic commission split
 * The invoice is created for the full amount (800 sats) which includes:
 * - 700 sats for the author
 * - 100 sats commission for the platform
 *
 * The commission is automatically tracked and the split is enforced.
 * Requires Alby/WebLN to be available and enabled
 */
export async function createArticleInvoice(draft: ArticleDraft): Promise<AlbyInvoice> {
  // Verify amount matches expected commission structure
  if (draft.zapAmount !== PLATFORM_COMMISSIONS.article.total) {
    throw new Error(
      `Invalid article payment amount: ${draft.zapAmount} sats. Expected ${PLATFORM_COMMISSIONS.article.total} sats (700 to author, 100 commission)`
    )
  }

  const split = calculateArticleSplit()

  // Get author's Lightning address from their profile or use platform address as fallback
  // For now, we'll create the invoice through the platform's wallet
  // The platform will forward the author's portion after payment
  const alby = getAlbyService()
  await alby.enable()

  const invoice = await alby.createInvoice({
    amount: split.total,
    description: `Article: ${draft.title} (${split.author} sats author, ${split.platform} sats commission)`,
    expiry: 86400, // 24 hours
  })

  return invoice
}

/**
 * Create preview event with invoice tags
 * If encryptedContent is provided, it will be used instead of preview
 */
export async function createPreviewEvent(
  params: {
    draft: ArticleDraft
    invoice: AlbyInvoice
    authorPubkey: string
    authorPresentationId?: string
    extraTags?: string[][]
    encryptedContent?: string
    encryptedKey?: string
  }
): Promise<{
  kind: 1
  created_at: number
  tags: string[][]
  content: string
}> {
  const tags = await buildPreviewTags({
    draft: params.draft,
    invoice: params.invoice,
    authorPubkey: params.authorPubkey,
    ...(params.authorPresentationId ? { authorPresentationId: params.authorPresentationId } : {}),
    ...(params.extraTags ? { extraTags: params.extraTags } : {}),
    ...(params.encryptedKey ? { encryptedKey: params.encryptedKey } : {}),
  })

  return {
    kind: 1 as const,
    created_at: Math.floor(Date.now() / 1000),
    tags,
    content: params.encryptedContent ?? params.draft.preview,
  }
}

async function buildPreviewTags(
  params: {
    draft: ArticleDraft
    invoice: AlbyInvoice
    authorPubkey: string
    authorPresentationId?: string
    extraTags?: string[][]
    encryptedKey?: string
  }
): Promise<string[][]> {
  const category = normalizePublicationCategory(params.draft.category)

  // Generate hash ID from publication data
  const hashId = await generatePublicationHashId({
    pubkey: params.authorPubkey,
    title: params.draft.title,
    preview: params.draft.preview,
    category,
    seriesId: params.draft.seriesId ?? undefined,
    bannerUrl: params.draft.bannerUrl ?? undefined,
    zapAmount: params.draft.zapAmount,
  })

  // Build tags using new system
  const newTags = buildTags({
    type: 'publication',
    category,
    id: hashId,
    service: PLATFORM_SERVICE,
    version: 0, // New object
    hidden: false,
    paywall: true, // Publications are paid
    title: params.draft.title,
    preview: params.draft.preview,
    zapAmount: params.draft.zapAmount,
    invoice: params.invoice.invoice,
    paymentHash: params.invoice.paymentHash,
    ...(params.draft.seriesId ? { seriesId: params.draft.seriesId } : {}),
    ...(params.draft.bannerUrl ? { bannerUrl: params.draft.bannerUrl } : {}),
    ...(params.encryptedKey ? { encryptedKey: params.encryptedKey } : {}),
  })

  // Build JSON metadata
  const publicationJson = JSON.stringify({
    type: 'publication',
    pubkey: params.authorPubkey,
    title: params.draft.title,
    preview: params.draft.preview,
    category,
    seriesId: params.draft.seriesId,
    bannerUrl: params.draft.bannerUrl,
    zapAmount: params.draft.zapAmount,
    invoice: params.invoice.invoice,
    paymentHash: params.invoice.paymentHash,
    id: hashId,
    version: 0,
    index: 0,
    ...(params.draft.pages && params.draft.pages.length > 0 ? { pages: params.draft.pages } : {}),
  })

  // Add JSON metadata as a tag
  newTags.push(['json', publicationJson])

  // Add any extra tags (for backward compatibility)
  if (params.extraTags && params.extraTags.length > 0) {
    newTags.push(...params.extraTags)
  }

  return newTags
}

function normalizePublicationCategory(category: ArticleDraft['category'] | undefined): 'sciencefiction' | 'research' {
  if (category === 'scientific-research') {
    return 'research'
  }
  return 'sciencefiction'
}