import { useState } from 'react'
import type { Article } from '@/types/nostr'
import type { AlbyInvoice } from '@/types/alby'
import { paymentService } from '@/lib/payment'
import { nostrService } from '@/lib/nostr'

export function useArticlePayment(
  article: Article,
  pubkey: string | null,
  onUnlockSuccess?: () => void,
  connect?: () => Promise<void>
) {
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [paymentInvoice, setPaymentInvoice] = useState<AlbyInvoice | null>(null)
  const [paymentHash, setPaymentHash] = useState<string | null>(null)

  const checkPaymentStatus = async (hash: string, userPubkey: string) => {
    try {
      const hasPaid = await paymentService.waitForArticlePayment(
        hash,
        article.id,
        article.pubkey,
        article.zapAmount,
        userPubkey,
        300000
      )

      if (hasPaid) {
        const content = await nostrService.getPrivateContent(article.id, article.pubkey)
        if (content) {
          setPaymentInvoice(null)
          setPaymentHash(null)
          onUnlockSuccess?.()
        } else {
          setError('Content not available. Please contact the author.')
        }
      }
    } catch (e) {
      console.error('Payment check error:', e)
    }
  }

  const handleUnlock = async () => {
    if (!pubkey) {
      if (connect) {
        setLoading(true)
        await connect()
        setLoading(false)
      } else {
        setError('Please connect with Nostr first')
      }
      return
    }

    setLoading(true)
    setError(null)

    try {
      const paymentResult = await paymentService.createArticlePayment({
        article,
        userPubkey: pubkey,
      })

      if (!paymentResult.success || !paymentResult.invoice || !paymentResult.paymentHash) {
        setError(paymentResult.error ?? 'Failed to create payment invoice')
        setLoading(false)
        return
      }

      setPaymentInvoice(paymentResult.invoice)
      setPaymentHash(paymentResult.paymentHash)
      setLoading(false)
      checkPaymentStatus(paymentResult.paymentHash, pubkey)
    } catch (e) {
      const errorMessage = e instanceof Error ? e.message : 'Failed to process payment'
      console.error('Payment processing error:', e)
      setError(errorMessage)
      setLoading(false)
    }
  }

  const handlePaymentComplete = async () => {
    if (paymentHash && pubkey) {
      await checkPaymentStatus(paymentHash, pubkey)
    }
  }

  const handleCloseModal = () => {
    setPaymentInvoice(null)
    setPaymentHash(null)
  }

  return {
    loading,
    error,
    paymentInvoice,
    handleUnlock,
    handlePaymentComplete,
    handleCloseModal,
  }
}