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'

type UseArticlePaymentResult = {
  loading: boolean
  error: string | null
  paymentInvoice: AlbyInvoice | null
  handleUnlock: () => Promise<void>
  handlePaymentComplete: () => Promise<void>
  handleCloseModal: () => void
}

export function useArticlePayment(
  article: Article,
  pubkey: string | null,
  onUnlockSuccess?: () => void,
  connect?: () => Promise<void>
): UseArticlePaymentResult {
  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 handleUnlock = (): Promise<void> =>
    unlockArticlePayment({
      article,
      pubkey,
      connect,
      onUnlockSuccess,
      setLoading,
      setError,
      setPaymentInvoice,
      setPaymentHash,
    })

  const handlePaymentComplete = (): Promise<void> =>
    checkPaymentAndUnlock({
      article,
      pubkey,
      paymentHash,
      onUnlockSuccess,
      setError,
      setPaymentInvoice,
      setPaymentHash,
    })

  const handleCloseModal = (): void => resetPaymentModalState({ setPaymentInvoice, setPaymentHash })

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

async function unlockArticlePayment(params: {
  article: Article
  pubkey: string | null
  connect: (() => Promise<void>) | undefined
  onUnlockSuccess: (() => void) | undefined
  setLoading: (value: boolean) => void
  setError: (value: string | null) => void
  setPaymentInvoice: (value: AlbyInvoice | null) => void
  setPaymentHash: (value: string | null) => void
}): Promise<void> {
  if (!params.pubkey) {
    await ensureConnectedOrError({
      connect: params.connect,
      setLoading: params.setLoading,
      setError: params.setError,
    })
    return
  }

  params.setLoading(true)
  params.setError(null)
  try {
    const paymentResult = await paymentService.createArticlePayment({
      article: params.article,
      userPubkey: params.pubkey,
    })
    if (!paymentResult.success || !paymentResult.invoice || !paymentResult.paymentHash) {
      params.setError(paymentResult.error ?? 'Failed to create payment invoice')
      return
    }
    params.setPaymentInvoice(paymentResult.invoice)
    params.setPaymentHash(paymentResult.paymentHash)
    void checkPaymentAndUnlock({
      article: params.article,
      pubkey: params.pubkey,
      paymentHash: paymentResult.paymentHash,
      onUnlockSuccess: params.onUnlockSuccess,
      setError: params.setError,
      setPaymentInvoice: params.setPaymentInvoice,
      setPaymentHash: params.setPaymentHash,
    })
  } catch (e) {
    const errorMessage = e instanceof Error ? e.message : 'Failed to process payment'
    console.error('Payment processing error:', e)
    params.setError(errorMessage)
  } finally {
    params.setLoading(false)
  }
}

async function ensureConnectedOrError(params: {
  connect: (() => Promise<void>) | undefined
  setLoading: (value: boolean) => void
  setError: (value: string | null) => void
}): Promise<void> {
  if (!params.connect) {
    params.setError('Please connect with Nostr first')
    return
  }
  params.setLoading(true)
  try {
    await params.connect()
  } finally {
    params.setLoading(false)
  }
}

async function checkPaymentAndUnlock(params: {
  article: Article
  pubkey: string | null
  paymentHash: string | null
  onUnlockSuccess: (() => void) | undefined
  setError: (value: string | null) => void
  setPaymentInvoice: (value: AlbyInvoice | null) => void
  setPaymentHash: (value: string | null) => void
}): Promise<void> {
  if (!params.paymentHash || !params.pubkey) {
    return
  }
  try {
    const hasPaid = await paymentService.waitForArticlePayment({
      paymentHash: params.paymentHash,
      articleId: params.article.id,
      articlePubkey: params.article.pubkey,
      amount: params.article.zapAmount,
      recipientPubkey: params.pubkey,
      timeout: 300000,
    })
    if (!hasPaid) {
      return
    }
    const content = await nostrService.getPrivateContent(params.article.id, params.article.pubkey)
    if (!content) {
      params.setError('Content not available. Please contact the author.')
      return
    }
    resetPaymentModalState({ setPaymentInvoice: params.setPaymentInvoice, setPaymentHash: params.setPaymentHash })
    params.onUnlockSuccess?.()
  } catch (e) {
    console.error('Payment check error:', e)
  }
}

function resetPaymentModalState(params: {
  setPaymentInvoice: (value: AlbyInvoice | null) => void
  setPaymentHash: (value: string | null) => void
}): void {
  params.setPaymentInvoice(null)
  params.setPaymentHash(null)
}