import { nostrService } from './nostr'
import { createArticleInvoice, createPreviewEvent } from './articleInvoice'
import { storePrivateContent, getStoredPrivateContent } from './articleStorage'
import { buildTags } from './nostrTagSystem'
import { PLATFORM_SERVICE } from './platformConfig'
import { generateSeriesHashId, generatePublicationHashId } from './hashIdGenerator'
import { buildObjectId } from './urlGenerator'
import type { ArticleDraft, PublishedArticle } from './articlePublisher'
import type { AlbyInvoice } from '@/types/alby'
import type { Article, Review, Series } from '@/types/nostr'
import { writeOrchestrator } from './writeOrchestrator'
import { finalizeEvent } from 'nostr-tools'
import { hexToBytes } from 'nostr-tools/utils'

export interface ArticleUpdateResult extends PublishedArticle {
  originalArticleId: string
}

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 { articlePublisher } = await import('./articlePublisher')
  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 buildParsedArticleFromDraft(
  draft: ArticleDraft,
  invoice: AlbyInvoice,
  authorPubkey: string
): Promise<{ article: Article; hash: string; version: number; index: number }> {
  const category = mapDraftCategoryToTag(draft.category)

  const hashId = await generatePublicationHashId({
    pubkey: authorPubkey,
    title: draft.title,
    preview: draft.preview,
    category,
    seriesId: draft.seriesId ?? undefined,
    bannerUrl: draft.bannerUrl ?? undefined,
    zapAmount: draft.zapAmount,
  })

  const hash = hashId
  const version = 0
  const index = 0
  const id = buildObjectId(hash, index, version)

  const article: Article = {
    id,
    hash,
    version,
    index,
    pubkey: authorPubkey,
    title: draft.title,
    preview: draft.preview,
    content: '',
    description: draft.preview,
    contentDescription: draft.preview,
    createdAt: Math.floor(Date.now() / 1000),
    zapAmount: draft.zapAmount,
    paid: false,
    thumbnailUrl: draft.bannerUrl ?? '',
    invoice: invoice.invoice,
    ...(invoice.paymentHash ? { paymentHash: invoice.paymentHash } : {}),
    ...(draft.category ? { category: draft.category } : {}),
    ...(draft.seriesId ? { seriesId: draft.seriesId } : {}),
    ...(draft.bannerUrl ? { bannerUrl: draft.bannerUrl } : {}),
    ...(draft.pages && draft.pages.length > 0 ? { pages: draft.pages } : {}),
    kindType: 'article',
  }

  return { article, hash, version, index }
}

function mapDraftCategoryToTag(category: ArticleDraft['category'] | undefined): 'sciencefiction' | 'research' {
  if (category === 'scientific-research') {
    return 'research'
  }
  return 'sciencefiction'
}

interface PublishPreviewWithInvoiceParams {
  draft: ArticleDraft
  invoice: AlbyInvoice
  authorPubkey: string
  presentationId: string
  extraTags?: string[][]
  customArticle?: Article
}

async function publishPreviewWithInvoice(
  params: PublishPreviewWithInvoiceParams
): Promise<import('nostr-tools').Event | null> {
  // Build parsed article object (use custom article if provided, e.g., for updates with version)
  let article: Article
  let hash: string
  let version: number
  let index: number

  if (params.customArticle) {
    ;({ hash, version } = params.customArticle)
    article = params.customArticle
    index = params.customArticle.index ?? 0
  } else {
    const built = await buildParsedArticleFromDraft(params.draft, params.invoice, params.authorPubkey)
    ;({ article, hash, version, index } = built)
  }

  // Build event template
  const previewEventTemplate = await createPreviewEvent({
    draft: params.draft,
    invoice: params.invoice,
    authorPubkey: params.authorPubkey,
    authorPresentationId: params.presentationId,
    ...(params.extraTags ? { extraTags: params.extraTags } : {}),
  })

  // Set private key in orchestrator
  const privateKey = nostrService.getPrivateKey()
  if (!privateKey) {
    throw new Error('Private key required for signing')
  }
  writeOrchestrator.setPrivateKey(privateKey)

  // Finalize event
  const secretKey = hexToBytes(privateKey)
  const event = finalizeEvent(previewEventTemplate, secretKey)

  // Get active relays
  const { relaySessionManager } = await import('./relaySessionManager')
  const activeRelays = await relaySessionManager.getActiveRelays()
  const { getPrimaryRelay } = await import('./config')
  const relays = activeRelays.length > 0 ? activeRelays : [await getPrimaryRelay()]

  // Publish via writeOrchestrator (parallel network + local write)
  const result = await writeOrchestrator.writeAndPublish(
    {
      objectType: 'publication',
      hash,
      event,
      parsed: article,
      version,
      hidden: false,
      index,
    },
    relays
  )

  if (!result.success) {
    return null
  }

  return event
}

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
  requireCategory(category)

  // Map category to new system
  const newCategory = category === 'science-fiction' ? 'sciencefiction' : 'research'

  // Generate hash ID from series data
  const hashId = await generateSeriesHashId({
    pubkey: params.authorPubkey,
    title: params.title,
    description: params.description,
    category: newCategory,
    coverUrl: params.coverUrl ?? undefined,
  })

  const hash = hashId
  const version = 0
  const index = 0
  const id = buildObjectId(hash, index, version)

  // Build parsed Series object
  const parsedSeries: Series = {
    id,
    hash,
    version,
    index,
    pubkey: params.authorPubkey,
    title: params.title,
    description: params.description,
    preview: params.preview ?? params.description.substring(0, 200),
    thumbnailUrl: params.coverUrl ?? '',
    category,
    ...(params.coverUrl ? { coverUrl: params.coverUrl } : {}),
    kindType: 'series',
  }

  // Build event template
  const eventTemplate = await buildSeriesEvent(params, category)

  // Set private key in orchestrator
  const privateKey = params.authorPrivateKey ?? nostrService.getPrivateKey()
  if (!privateKey) {
    throw new Error('Private key required for signing')
  }
  writeOrchestrator.setPrivateKey(privateKey)

  // Finalize event
  const secretKey = hexToBytes(privateKey)
  const event = finalizeEvent(eventTemplate, secretKey)

  // Get active relays
  const { relaySessionManager } = await import('./relaySessionManager')
  const activeRelays = await relaySessionManager.getActiveRelays()
  const { getPrimaryRelay } = await import('./config')
  const relays = activeRelays.length > 0 ? activeRelays : [await getPrimaryRelay()]

  // Publish via writeOrchestrator (parallel network + local write)
  const result = await writeOrchestrator.writeAndPublish(
    {
      objectType: 'series',
      hash,
      event,
      parsed: parsedSeries,
      version,
      hidden: false,
      index,
    },
    relays
  )

  if (!result.success) {
    throw new Error('Failed to publish series')
  }

  return parsedSeries
}

async function buildSeriesEvent(
  params: {
    title: string
    description: string
    preview?: string
    coverUrl?: string
    authorPubkey: string
  },
  category: NonNullable<ArticleDraft['category']>
): Promise<{
  kind: number
  created_at: number
  content: string
  tags: string[][]
}> {
  // Map category to new system
  const newCategory = category === 'science-fiction' ? 'sciencefiction' : 'research'

  // Generate hash ID from series data
  const hashId = await generateSeriesHashId({
    pubkey: params.authorPubkey,
    title: params.title,
    description: params.description,
    category: newCategory,
    coverUrl: params.coverUrl ?? undefined,
  })

  // Build JSON metadata
  const seriesJson = JSON.stringify({
    type: 'series',
    pubkey: params.authorPubkey,
    title: params.title,
    description: params.description,
    preview: params.preview ?? params.description.substring(0, 200),
    coverUrl: params.coverUrl,
    category: newCategory,
    id: hashId,
    version: 0,
    index: 0,
  })

  const tags = buildTags({
    type: 'series',
    category: newCategory,
    id: hashId,
    service: PLATFORM_SERVICE,
    version: 0, // New object
    hidden: false,
    paywall: false,
    title: params.title,
    description: params.description,
    preview: params.preview ?? params.description.substring(0, 200),
    ...(params.coverUrl ? { coverUrl: params.coverUrl } : {}),
  })

  // Add JSON metadata as a tag
  tags.push(['json', seriesJson])

  return {
    kind: 1,
    created_at: Math.floor(Date.now() / 1000),
    content: params.preview ?? params.description.substring(0, 200),
    tags,
  }
}

export async function publishReview(params: {
  articleId: string
  seriesId: string
  category: ArticleDraft['category']
  authorPubkey: string
  reviewerPubkey: string
  content: string
  title?: string
  text?: string
  authorPrivateKey?: string
}): Promise<Review> {
  ensureKeys(params.reviewerPubkey, params.authorPrivateKey)
  const {category} = params
  requireCategory(category)

  // Generate hash ID from review data
  const { generateReviewHashId } = await import('./hashIdGenerator')
  const hashId = await generateReviewHashId({
    pubkey: params.reviewerPubkey,
    articleId: params.articleId,
    reviewerPubkey: params.reviewerPubkey,
    content: params.content,
    ...(params.title ? { title: params.title } : {}),
  })

  const hash = hashId
  const version = 0
  const index = 0
  const id = buildObjectId(hash, index, version)

  // Build parsed Review object
  const parsedReview: Review = {
    id,
    hash,
    version,
    index,
    articleId: params.articleId,
    authorPubkey: params.authorPubkey,
    reviewerPubkey: params.reviewerPubkey,
    content: params.content,
    description: params.content.substring(0, 200),
    createdAt: Math.floor(Date.now() / 1000),
    ...(params.title ? { title: params.title } : {}),
    ...(params.text ? { text: params.text } : {}),
    kindType: 'review',
  }

  // Build event template
  const eventTemplate = await buildReviewEvent(params, category)

  // Set private key in orchestrator
  const privateKey = params.authorPrivateKey ?? nostrService.getPrivateKey()
  if (!privateKey) {
    throw new Error('Private key required for signing')
  }
  writeOrchestrator.setPrivateKey(privateKey)

  // Finalize event
  const secretKey = hexToBytes(privateKey)
  const event = finalizeEvent(eventTemplate, secretKey)

  // Get active relays
  const { relaySessionManager } = await import('./relaySessionManager')
  const activeRelays = await relaySessionManager.getActiveRelays()
  const { getPrimaryRelay } = await import('./config')
  const relays = activeRelays.length > 0 ? activeRelays : [await getPrimaryRelay()]

  // Publish via writeOrchestrator (parallel network + local write)
  const result = await writeOrchestrator.writeAndPublish(
    {
      objectType: 'review',
      hash,
      event,
      parsed: parsedReview,
      version,
      hidden: false,
      index,
    },
    relays
  )

  if (!result.success) {
    throw new Error('Failed to publish review')
  }

  return parsedReview
}

async function buildReviewEvent(
  params: {
    articleId: string
    seriesId: string
    authorPubkey: string
    reviewerPubkey: string
    content: string
    title?: string
    text?: string
  },
  category: NonNullable<ArticleDraft['category']>
): Promise<{
  kind: number
  created_at: number
  content: string
  tags: string[][]
}> {
  // Map category to new system
  const newCategory = category === 'science-fiction' ? 'sciencefiction' : 'research'

  // Generate hash ID from review data
  const { generateReviewHashId } = await import('./hashIdGenerator')
  const hashId = await generateReviewHashId({
    pubkey: params.reviewerPubkey,
    articleId: params.articleId,
    reviewerPubkey: params.reviewerPubkey,
    content: params.content,
    ...(params.title ? { title: params.title } : {}),
  })

  // Build JSON metadata
  const reviewJson = JSON.stringify({
    type: 'review',
    pubkey: params.reviewerPubkey,
    articleId: params.articleId,
    reviewerPubkey: params.reviewerPubkey,
    content: params.content,
    title: params.title,
    category: newCategory,
    id: hashId,
    version: 0,
    index: 0,
  })

  const tags = buildTags({
    type: 'quote',
    category: newCategory,
    id: hashId,
    service: PLATFORM_SERVICE,
    version: 0, // New object
    hidden: false,
    paywall: false,
    articleId: params.articleId,
    reviewerPubkey: params.reviewerPubkey,
    ...(params.title ? { title: params.title } : {}),
  })

  // Add text tag if provided
  if (params.text) {
    tags.push(['text', params.text])
  }

  // Add JSON metadata as a tag
  tags.push(['json', reviewJson])

  return {
    kind: 1,
    created_at: Math.floor(Date.now() / 1000),
    content: params.content,
    tags,
  }
}

async function buildUpdateTags(params: {
  draft: ArticleDraft
  originalArticleId: string
  newCategory: 'sciencefiction' | 'research'
  authorPubkey: string
  currentVersion?: number
}): Promise<string[][]> {
  // Generate hash ID from publication data
  const hashId = await generatePublicationHashId({
    pubkey: params.authorPubkey,
    title: params.draft.title,
    preview: params.draft.preview,
    category: params.newCategory,
    seriesId: params.draft.seriesId ?? undefined,
    bannerUrl: params.draft.bannerUrl ?? undefined,
    zapAmount: params.draft.zapAmount,
  })

  // Increment version for update
  const currentVersion = params.currentVersion ?? 0
  const nextVersion = currentVersion + 1

  const updateTags = buildTags({
    type: 'publication',
    category: params.newCategory,
    id: hashId,
    service: PLATFORM_SERVICE,
    version: nextVersion,
    hidden: false,
    paywall: true,
    title: params.draft.title,
    preview: params.draft.preview,
    zapAmount: params.draft.zapAmount,
    ...(params.draft.seriesId ? { seriesId: params.draft.seriesId } : {}),
    ...(params.draft.bannerUrl ? { bannerUrl: params.draft.bannerUrl } : {}),
  })
  updateTags.push(['e', params.originalArticleId], ['replace', 'article-update'])
  return updateTags
}

async function publishUpdate(
  draft: ArticleDraft,
  authorPubkey: string,
  originalArticleId: string
): Promise<ArticleUpdateResult> {
  const {category} = draft
  requireCategory(category)

  // Get original article from IndexedDB to retrieve current version
  const { objectCache } = await import('./objectCache')
  const originalArticle = await objectCache.getById('publication', originalArticleId) as Article | null

  if (!originalArticle) {
    return updateFailure(originalArticleId, 'Original article not found in cache')
  }

  // Verify user is the author
  if (originalArticle.pubkey !== authorPubkey) {
    return updateFailure(originalArticleId, 'Only the author can update this article')
  }

  const presentationId = await ensurePresentation(authorPubkey)
  const invoice = await createArticleInvoice(draft)
  const newCategory = category === 'science-fiction' ? 'sciencefiction' : 'research'

  // Use current version from original article
  const currentVersion = originalArticle.version ?? 0
  const updateTags = await buildUpdateTags({
    draft,
    originalArticleId,
    newCategory,
    authorPubkey,
    currentVersion,
  })

  // Build parsed article with incremented version
  const { article } = await buildParsedArticleFromDraft(draft, invoice, authorPubkey)
  const updatedArticle: Article = {
    ...article,
    version: currentVersion + 1, // Increment version for update
  }

  const publishedEvent = await publishPreviewWithInvoice({
    draft,
    invoice,
    authorPubkey,
    presentationId,
    extraTags: updateTags,
    customArticle: updatedArticle,
  })
  if (!publishedEvent) {
    return updateFailure(originalArticleId, 'Failed to publish article update')
  }
  await storePrivateContent({ articleId: publishedEvent.id, content: draft.content, authorPubkey, invoice })
  return {
    articleId: publishedEvent.id,
    previewEventId: publishedEvent.id,
    invoice,
    success: true,
    originalArticleId,
  }
}

export async function publishArticleUpdate(
  originalArticleId: string,
  draft: ArticleDraft,
  authorPubkey: string,
  authorPrivateKey?: string
): Promise<ArticleUpdateResult> {
  try {
    ensureKeys(authorPubkey, authorPrivateKey)
    return publishUpdate(draft, authorPubkey, 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 originalEvent = await getOriginalPublicationEventOrThrow(articleId)
  assertAuthorOwnsEvent({ eventPubkey: originalEvent.pubkey, authorPubkey })

  const deleteEventTemplate = await buildDeleteEventTemplateOrThrow({ originalEvent, authorPubkey })
  const originalParsed = await parseOriginalArticleOrThrow(originalEvent)
  const deletePayload = await buildDeletedArticlePayload({ originalParsed, deleteEventTemplate })

  const event = await finalizeEventTemplate({ template: deleteEventTemplate, authorPrivateKey })
  const relays = await getActiveRelaysOrPrimary()
  await publishDeletion({ event, relays, payload: deletePayload })
}

async function getOriginalPublicationEventOrThrow(articleId: string): Promise<import('nostr-tools').Event> {
  const { objectCache } = await import('./objectCache')
  const originalEvent = await objectCache.getEventById('publication', articleId)
  if (!originalEvent) {
    throw new Error('Article not found in cache')
  }
  return originalEvent
}

function assertAuthorOwnsEvent(params: { eventPubkey: string; authorPubkey: string }): void {
  if (params.eventPubkey !== params.authorPubkey) {
    throw new Error('Only the author can delete this article')
  }
}

async function buildDeleteEventTemplateOrThrow(params: {
  originalEvent: import('nostr-tools').Event
  authorPubkey: string
}): Promise<import('nostr-tools').EventTemplate> {
  const { buildDeleteEvent } = await import('./objectModification')
  const template = await buildDeleteEvent(params.originalEvent, params.authorPubkey)
  if (!template) {
    throw new Error('Failed to build delete event')
  }
  return template
}

async function parseOriginalArticleOrThrow(originalEvent: import('nostr-tools').Event): Promise<Article> {
  const { parseArticleFromEvent } = await import('./nostrEventParsing')
  const parsed = await parseArticleFromEvent(originalEvent)
  if (!parsed) {
    throw new Error('Failed to parse original article')
  }
  return parsed
}

async function buildDeletedArticlePayload(params: {
  originalParsed: Article
  deleteEventTemplate: import('nostr-tools').EventTemplate
}): Promise<{ hash: string; index: number; version: number; parsed: Article }> {
  const { extractTagsFromEvent } = await import('./nostrTagSystem')
  const tags = extractTagsFromEvent(params.deleteEventTemplate)
  const version = tags.version ?? params.originalParsed.version + 1
  const index = params.originalParsed.index ?? 0
  const parsed: Article = { ...params.originalParsed, version }
  return { hash: params.originalParsed.hash, index, version, parsed }
}

async function finalizeEventTemplate(params: {
  template: import('nostr-tools').EventTemplate
  authorPrivateKey: string | undefined
}): Promise<import('nostr-tools').Event> {
  const privateKey = params.authorPrivateKey ?? nostrService.getPrivateKey()
  if (!privateKey) {
    throw new Error('Private key required for signing')
  }
  const { writeOrchestrator: writeOrchestratorInstance } = await import('./writeOrchestrator')
  writeOrchestratorInstance.setPrivateKey(privateKey)

  const { finalizeEvent: finalizeNostrEvent } = await import('nostr-tools')
  const { hexToBytes: hexToBytesUtil } = await import('nostr-tools/utils')
  const secretKey = hexToBytesUtil(privateKey)
  return finalizeNostrEvent(params.template, secretKey)
}

async function getActiveRelaysOrPrimary(): Promise<string[]> {
  const { relaySessionManager } = await import('./relaySessionManager')
  const activeRelays = await relaySessionManager.getActiveRelays()
  if (activeRelays.length > 0) {
    return activeRelays
  }
  const { getPrimaryRelay } = await import('./config')
  return [await getPrimaryRelay()]
}

async function publishDeletion(params: {
  event: import('nostr-tools').Event
  relays: string[]
  payload: { hash: string; index: number; version: number; parsed: Article }
}): Promise<void> {
  const { writeOrchestrator: writeOrchestratorInstance } = await import('./writeOrchestrator')
  const result = await writeOrchestratorInstance.writeAndPublish(
    {
      objectType: 'publication',
      hash: params.payload.hash,
      event: params.event,
      parsed: params.payload.parsed,
      version: params.payload.version,
      hidden: true,
      index: params.payload.index,
    },
    params.relays
  )
  if (!result.success) {
    throw new Error('Failed to publish delete event')
  }
}

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