import { nostrService } from './nostr'
import { createArticleInvoice, createPreviewEvent } from './articleInvoice'
import { storePrivateContent, getStoredPrivateContent } from './articleStorage'
import { buildReviewTags, buildSeriesTags } from './nostrTags'
import type { ArticleDraft, PublishedArticle } from './articlePublisher'
import type { AlbyInvoice } from '@/types/alby'
import type { Review, Series } from '@/types/nostr'

export interface ArticleUpdateResult extends PublishedArticle {
  originalArticleId: string
}

const SITE_TAG = process.env.NEXT_PUBLIC_SITE_TAG ?? 'zapwall4science'

function ensureKeys(authorPubkey: string, authorPrivateKey?: string): void {
  nostrService.setPublicKey(authorPubkey)
  if (authorPrivateKey) {
    nostrService.setPrivateKey(authorPrivateKey)
  } else if (!nostrService.getPrivateKey()) {
    throw new Error('Private key required for signing. Connect a wallet that can sign.')
  }
}

function requireCategory(category?: ArticleDraft['category']): asserts category is NonNullable<ArticleDraft['category']> {
  if (category !== 'science-fiction' && category !== 'scientific-research') {
    throw new Error('Vous devez sélectionner une catégorie (science-fiction ou recherche scientifique).')
  }
}

async function ensurePresentation(authorPubkey: string): Promise<string> {
  const presentation = await articlePublisher.getAuthorPresentation(authorPubkey)
  if (!presentation) {
    throw new Error('Vous devez créer un article de présentation avant de publier des articles.')
  }
  return presentation.id
}

async function publishPreviewWithInvoice(
  draft: ArticleDraft,
  invoice: AlbyInvoice,
  presentationId: string,
  extraTags?: string[][]
): Promise<import('nostr-tools').Event | null> {
  const previewEvent = createPreviewEvent(draft, invoice, presentationId, extraTags)
  const publishedEvent = await nostrService.publishEvent(previewEvent)
  return publishedEvent ?? null
}

export async function publishSeries(params: {
  title: string
  description: string
  preview?: string
  coverUrl?: string
  category: ArticleDraft['category']
  authorPubkey: string
  authorPrivateKey?: string
}): Promise<Series> {
  ensureKeys(params.authorPubkey, params.authorPrivateKey)
  const category = params.category
  requireCategory(category)
  const event = buildSeriesEvent(params, category)
  const published = await nostrService.publishEvent(event)
  if (!published) {
    throw new Error('Failed to publish series')
  }
  return {
    id: published.id,
    pubkey: params.authorPubkey,
    title: params.title,
    description: params.description,
    preview: params.preview ?? params.description.substring(0, 200),
    category,
    ...(params.coverUrl ? { coverUrl: params.coverUrl } : {}),
    kindType: 'series',
  }
}

function buildSeriesEvent(
  params: {
    title: string
    description: string
    preview?: string
    coverUrl?: string
    authorPubkey: string
  },
  category: NonNullable<ArticleDraft['category']>
) {
  return {
    kind: 1,
    created_at: Math.floor(Date.now() / 1000),
    content: params.preview ?? params.description.substring(0, 200),
    tags: buildSeriesTags({
      site: SITE_TAG,
      category,
      author: params.authorPubkey,
      seriesId: 'pending',
      title: params.title,
      description: params.description,
      ...(params.preview ? { preview: params.preview } : { preview: params.description.substring(0, 200) }),
      ...(params.coverUrl ? { coverUrl: params.coverUrl } : {}),
      kindType: 'series',
    }),
  }
}

export async function publishReview(params: {
  articleId: string
  seriesId: string
  category: ArticleDraft['category']
  authorPubkey: string
  reviewerPubkey: string
  content: string
  title?: string
  authorPrivateKey?: string
}): Promise<Review> {
  ensureKeys(params.reviewerPubkey, params.authorPrivateKey)
  const category = params.category
  requireCategory(category)
  const event = buildReviewEvent(params, category)
  const published = await nostrService.publishEvent(event)
  if (!published) {
    throw new Error('Failed to publish review')
  }
  return {
    id: published.id,
    articleId: params.articleId,
    authorPubkey: params.authorPubkey,
    reviewerPubkey: params.reviewerPubkey,
    content: params.content,
    createdAt: published.created_at,
    ...(params.title ? { title: params.title } : {}),
    kindType: 'review',
  }
}

function buildReviewEvent(
  params: {
    articleId: string
    seriesId: string
    authorPubkey: string
    reviewerPubkey: string
    content: string
    title?: string
  },
  category: NonNullable<ArticleDraft['category']>
) {
  return {
    kind: 1,
    created_at: Math.floor(Date.now() / 1000),
    content: params.content,
    tags: buildReviewTags({
      site: SITE_TAG,
      category,
      author: params.authorPubkey,
      seriesId: params.seriesId,
      articleId: params.articleId,
      reviewer: params.reviewerPubkey,
      ...(params.title ? { title: params.title } : {}),
      kindType: 'review',
    }),
  }
}

export async function publishArticleUpdate(
  originalArticleId: string,
  draft: ArticleDraft,
  authorPubkey: string,
  authorPrivateKey?: string
): Promise<ArticleUpdateResult> {
  try {
    ensureKeys(authorPubkey, authorPrivateKey)
    const category = draft.category
    requireCategory(category)
    const presentationId = await ensurePresentation(authorPubkey)
    const invoice = await createArticleInvoice(draft)
    const publishedEvent = await publishPreviewWithInvoice(draft, invoice, presentationId, [
      ['e', originalArticleId],
      ['replace', 'article-update'],
      ['kind_type', 'article'],
      ['site', SITE_TAG],
      ['category', category],
      ...(draft.seriesId ? [['series', draft.seriesId]] : []),
    ])
    if (!publishedEvent) {
      return updateFailure(originalArticleId, 'Failed to publish article update')
    }
    await storePrivateContent(publishedEvent.id, draft.content, authorPubkey, invoice)
    return {
      articleId: publishedEvent.id,
      previewEventId: publishedEvent.id,
      invoice,
      success: true,
      originalArticleId,
    }
  } catch (error) {
    return updateFailure(originalArticleId, error instanceof Error ? error.message : 'Unknown error')
  }
}

function updateFailure(originalArticleId: string, error?: string): ArticleUpdateResult {
  return {
    articleId: '',
    previewEventId: '',
    success: false,
    originalArticleId,
    ...(error ? { error } : {}),
  }
}

export async function deleteArticleEvent(articleId: string, authorPubkey: string, authorPrivateKey?: string): Promise<void> {
  ensureKeys(authorPubkey, authorPrivateKey)
  const deleteEvent = {
    kind: 5,
    created_at: Math.floor(Date.now() / 1000),
    tags: [['e', articleId]] as string[][],
    content: 'deleted',
  } as const
  const published = await nostrService.publishEvent(deleteEvent)
  if (!published) {
    throw new Error('Failed to publish delete event')
  }
}

// Re-export for convenience to avoid circular imports in hooks
import { articlePublisher } from './articlePublisher'
export const getStoredContent = getStoredPrivateContent