import type { Event } from 'nostr-tools'
import { SimplePool } from 'nostr-tools'

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

/**
 * Check if user has paid for an article by looking for zap receipts
 */
export async function checkZapReceipt(
  pool: SimplePool,
  targetPubkey: string,
  targetEventId: string,
  amount: number,
  userPubkey: string
): Promise<boolean> {
  if (!pool) {
    return false
  }

  return new Promise((resolve) => {
    const filters = [
      {
        kinds: [9735], // Zap receipt
        '#p': [targetPubkey],
        '#e': [targetEventId],
        authors: [userPubkey], // Filter by the payer's pubkey
      },
    ]

    let resolved = false
    const sub = pool.sub([RELAY_URL], filters)

    sub.on('event', async (event: Event) => {
      if (resolved) return

      // Import verification service dynamically to avoid circular dependencies
      const { zapVerificationService } = await import('./zapVerification')

      // Verify the zap receipt signature and details
      const isValid = zapVerificationService.verifyZapReceiptForArticle(
        event,
        targetEventId,
        targetPubkey,
        userPubkey,
        amount
      )

      if (isValid) {
        resolved = true
        sub.unsub()
        resolve(true)
      }
    })

    sub.on('eose', () => {
      if (!resolved) {
        resolved = true
        sub.unsub()
        resolve(false)
      }
    })

    setTimeout(() => {
      if (!resolved) {
        resolved = true
        sub.unsub()
        resolve(false)
      }
    }, 3000)
  })
}