story-research-zapwall/lib/paymentPolling.ts

import { nostrService } from './nostr'
import { articlePublisher } from './articlePublisher'
import { getStoredPrivateContent } from './articleStorage'
import { platformTracking } from './platformTracking'
import { calculateArticleSplit, PLATFORM_COMMISSIONS } from './platformCommissions'
import type { SimplePoolWithSub } from '@/types/nostr-tools-extended'

const RELAY_URL = process.env.NEXT_PUBLIC_NOSTR_RELAY_URL ?? 'wss://relay.damus.io'

/**
 * Poll for payment completion via zap receipt verification
 * After payment is confirmed, sends private content to the user
 */
async function pollPaymentUntilDeadline(
  articleId: string,
  articlePubkey: string,
  amount: number,
  recipientPubkey: string,
  interval: number,
  deadline: number
): Promise<boolean> {
  try {
    const zapReceiptExists = await nostrService.checkZapReceipt(articlePubkey, articleId, amount, recipientPubkey)
    if (zapReceiptExists) {
      const zapReceiptId = await getZapReceiptId(articlePubkey, articleId, amount, recipientPubkey)
      await sendPrivateContentAfterPayment(articleId, recipientPubkey, amount, zapReceiptId)
      return true
    }
  } catch (error) {
    console.error('Error checking zap receipt:', error)
  }

  if (Date.now() > deadline) {
    return false
  }

  return new Promise<boolean>((resolve) => {
    setTimeout(() => {
      void pollPaymentUntilDeadline(articleId, articlePubkey, amount, recipientPubkey, interval, deadline)
        .then(resolve)
        .catch(() => resolve(false))
    }, interval)
  })
}

export async function waitForArticlePayment(
  _paymentHash: string,
  articleId: string,
  articlePubkey: string,
  amount: number,
  recipientPubkey: string,
  timeout: number = 300000 // 5 minutes
): Promise<boolean> {
  const interval = 2000
  const deadline = Date.now() + timeout
  try {
    return await pollPaymentUntilDeadline(articleId, articlePubkey, amount, recipientPubkey, interval, deadline)
  } catch (error) {
    console.error('Wait for payment error:', error)
    return false
  }
}

async function getZapReceiptId(
  articlePubkey: string,
  articleId: string,
  amount: number,
  recipientPubkey: string
): Promise<string | undefined> {
  try {
    const pool = nostrService.getPool()
    if (!pool) {
      return undefined
    }

    const filters = [
      {
        kinds: [9735],
        '#p': [articlePubkey],
        '#e': [articleId],
        limit: 1,
      },
    ]

    return new Promise((resolve) => {
      let resolved = false
      const poolWithSub = pool as import('@/types/nostr-tools-extended').SimplePoolWithSub
      const sub = poolWithSub.sub([RELAY_URL], filters)

      const finalize = (value: string | undefined) => {
        if (resolved) {
          return
        }
        resolved = true
        sub.unsub()
        resolve(value)
      }

      sub.on('event', (event) => {
        const amountTag = event.tags.find((tag) => tag[0] === 'amount')?.[1]
        const amountInSats = amountTag ? Math.floor(parseInt(amountTag, 10) / 1000) : 0
        if (amountInSats === amount && event.pubkey === recipientPubkey) {
          finalize(event.id)
        }
      })

      sub.on('eose', () => finalize(undefined))
      setTimeout(() => finalize(undefined), 3000)
    })
  } catch (error) {
    console.error('Error getting zap receipt ID', {
      articleId,
      recipientPubkey,
      error: error instanceof Error ? error.message : 'Unknown error',
    })
    return undefined
  }
}

/**
 * Send private content to user after payment confirmation
 * Returns true if content was successfully sent and verified
 */
async function sendPrivateContentAfterPayment(
  articleId: string,
  recipientPubkey: string,
  amount: number,
  zapReceiptId?: string
): Promise<boolean> {
  const storedContent = await getStoredPrivateContent(articleId)

  if (!storedContent) {
    console.error('Stored private content not found for article', {
      articleId,
      recipientPubkey,
      timestamp: new Date().toISOString(),
    })
    return false
  }

  const authorPrivateKey = nostrService.getPrivateKey()

  if (!authorPrivateKey) {
    console.error('Author private key not available, cannot send private content automatically', {
      articleId,
      recipientPubkey,
      authorPubkey: storedContent.authorPubkey,
      timestamp: new Date().toISOString(),
    })
    return false
  }

  const result = await articlePublisher.sendPrivateContent(articleId, recipientPubkey, authorPrivateKey)

  if (result.success && result.messageEventId) {
    const timestamp = Math.floor(Date.now() / 1000)

    // Verify payment amount matches expected commission structure
    const expectedSplit = calculateArticleSplit()
    if (amount !== expectedSplit.total) {
      console.error('Payment amount does not match expected commission structure', {
        articleId,
        paidAmount: amount,
        expectedTotal: expectedSplit.total,
        expectedAuthor: expectedSplit.author,
        expectedPlatform: expectedSplit.platform,
        timestamp: new Date().toISOString(),
      })
    }

    // Track content delivery with commission information
    await platformTracking.trackContentDelivery(
      {
        articleId,
        articlePubkey: storedContent.authorPubkey,
        recipientPubkey,
        messageEventId: result.messageEventId,
        amount,
        authorAmount: expectedSplit.author,
        platformCommission: expectedSplit.platform,
        timestamp,
        verified: result.verified ?? false,
        zapReceiptId,
      },
      authorPrivateKey
    )

    // Log commission information for platform tracking
    console.log('Article payment processed with commission', {
      articleId,
      totalAmount: amount,
      authorPortion: expectedSplit.author,
      platformCommission: expectedSplit.platform,
      recipientPubkey,
      timestamp: new Date().toISOString(),
    })

    if (result.verified) {
      console.log('Private content sent and verified on relay', {
        articleId,
        recipientPubkey,
        messageEventId: result.messageEventId,
        timestamp: new Date().toISOString(),
      })
      return true
    } else {
      console.warn('Private content sent but not yet verified on relay', {
        articleId,
        recipientPubkey,
        messageEventId: result.messageEventId,
        timestamp: new Date().toISOString(),
      })
      return true
    }
  } else {
    console.error('Failed to send private content, but payment was confirmed', {
      articleId,
      recipientPubkey,
      error: result.error,
      timestamp: new Date().toISOString(),
    })
    return false
  }
}