import { type Event } from 'nostr-tools'
import { nip19 } from 'nostr-tools'
import type { AuthorPresentationDraft } from './articlePublisher'
import type { SimplePoolWithSub } from '@/types/nostr-tools-extended'
import { createSubscription } from '@/types/nostr-tools-extended'
import { buildTags, extractTagsFromEvent, buildTagFilter } from './nostrTagSystem'
import { getPrimaryRelaySync } from './config'
import { PLATFORM_SERVICE, MIN_EVENT_DATE } from './platformConfig'
import { generateAuthorHashId } from './hashIdGenerator'
import { generateObjectUrl, buildObjectId, parseObjectId } from './urlGenerator'
import { getLatestVersion } from './versionManager'
import { objectCache } from './objectCache'

interface BuildPresentationEventParams {
  draft: AuthorPresentationDraft
  authorPubkey: string
  authorName: string
  category?: 'sciencefiction' | 'research'
  version?: number
  index?: number
}

export async function buildPresentationEvent(
  params: BuildPresentationEventParams
): Promise<{
  kind: 1
  created_at: number
  tags: string[][]
  content: string
}> {
  const category = params.category ?? 'sciencefiction'
  const version = params.version ?? 0
  const index = params.index ?? 0
  // Extract presentation and contentDescription from draft.content
  // Format: "${presentation}\n\n---\n\nDescription du contenu :\n${contentDescription}"
  const separator = '\n\n---\n\nDescription du contenu :\n'
  const separatorIndex = params.draft.content.indexOf(separator)
  const presentation = separatorIndex !== -1 ? params.draft.content.substring(0, separatorIndex) : params.draft.presentation
  let contentDescription = separatorIndex !== -1 ? params.draft.content.substring(separatorIndex + separator.length) : params.draft.contentDescription

  // Remove Bitcoin address from contentDescription if present (should not be visible in note content)
  // Remove lines matching "Adresse Bitcoin mainnet (pour le sponsoring) : ..."
  if (contentDescription) {
    contentDescription = contentDescription
      .split('\n')
      .filter((line) => !line.includes('Adresse Bitcoin mainnet (pour le sponsoring)'))
      .join('\n')
      .trim()
  }

  // Generate hash ID from author data first (needed for URL)
  const hashId = await generateAuthorHashId({
    pubkey: params.authorPubkey,
    authorName: params.authorName,
    presentation,
    contentDescription,
    mainnetAddress: params.draft.mainnetAddress ?? undefined,
    pictureUrl: params.draft.pictureUrl ?? undefined,
    category,
  })

  // Build URL: https://zapwall.fr/author/<hash>_<index>_<version> (using hash ID)
  const profileUrl = generateObjectUrl('author', hashId, index, version)

  // Encode pubkey to npub (for metadata JSON)
  const npub = nip19.npubEncode(params.authorPubkey)

  // Build visible content message
  // If picture exists, use it as preview image for the link (markdown format)
  // Note: The image will display at full size in most Nostr clients, not as a thumbnail
  const {draft} = params
  const linkWithPreview = draft.pictureUrl
    ? `[![${params.authorName}](${draft.pictureUrl})](${profileUrl})`
    : profileUrl

  const visibleContent = [
    'Nouveau profil auteur publié sur zapwall.fr (plateforme de publications scientifiques)',
    linkWithPreview,
    `Présentation personnelle : ${presentation}`,
    ...(contentDescription ? [`Description de votre contenu : ${contentDescription}`] : []),
  ].join('\n')

  // Build profile JSON for metadata (stored in tag, not in content)
  const profileJson = JSON.stringify({
    authorName: params.authorName,
    npub,
    pubkey: params.authorPubkey,
    presentation,
    contentDescription,
    mainnetAddress: draft.mainnetAddress,
    pictureUrl: draft.pictureUrl,
    category,
    url: profileUrl,
    version,
    index,
  })

  // Build tags (profile JSON is in tag, not in content)
  const tags = buildTags({
    type: 'author',
    category,
    id: hashId,
    service: PLATFORM_SERVICE,
    version,
    hidden: false,
    paywall: false,
    title: draft.title,
    preview: draft.preview,
    mainnetAddress: draft.mainnetAddress,
    ...(draft.pictureUrl ? { pictureUrl: draft.pictureUrl } : {}),
  })

  // Add JSON metadata as a tag (not in visible content)
  tags.push(['json', profileJson])

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

export async function parsePresentationEvent(event: Event): Promise<import('@/types/nostr').AuthorPresentationArticle | null> {
  const tags = extractTagsFromEvent(event)

  // Check if it's an author type (tag is 'author' in English)
  if (tags.type !== 'author') {
    return null
  }

  const profileData = readPresentationProfileData(tags.json, event.content)
  const originalCategory = mapTagCategoryToOriginalCategory(tags.category)
  const { hash, version, index } = await resolvePresentationIdParts({ tags, event, profileData })
  const id = buildObjectId(hash, index, version)

  return buildPresentationArticle({
    id,
    hash,
    version,
    index,
    event,
    tags,
    profileData,
    originalCategory,
  })
}

type PresentationProfileData = {
  authorName?: string
  presentation?: string
  contentDescription?: string
  mainnetAddress?: string
  pictureUrl?: string
  category?: string
}

function readPresentationProfileData(jsonTag: string | undefined, content: string): PresentationProfileData | null {
  if (jsonTag) {
    return parsePresentationProfileJson(jsonTag)
  }

  // Backward compatibility: invisible format (with zero-width characters)
  const invisibleJsonMatch = content.match(/[\u200B\u200C]\[Metadata JSON\][\u200B\u200C]\n[\u200B\u200C](.+)[\u200B\u200C]$/s)
  if (invisibleJsonMatch?.[1]) {
    try {
      const cleanedJson = invisibleJsonMatch[1].replace(/[\u200B\u200C\u200D\u200E\u200F]/g, '').trim()
      return parsePresentationProfileJson(cleanedJson)
    } catch (invisibleJsonError) {
      console.error('Error parsing profile JSON from invisible content:', invisibleJsonError)
    }
  }

  // Backward compatibility: visible format
  const jsonMatch = content.match(/\[Metadata JSON\]\n(.+)$/s)
  if (jsonMatch?.[1]) {
    return parsePresentationProfileJson(jsonMatch[1].trim())
  }

  return null
}

function mapTagCategoryToOriginalCategory(category: unknown): 'science-fiction' | 'scientific-research' | undefined {
  if (category === 'sciencefiction') {
    return 'science-fiction'
  }
  if (category === 'research') {
    return 'scientific-research'
  }
  return undefined
}

async function resolvePresentationIdParts(params: {
  tags: ReturnType<typeof extractTagsFromEvent>
  event: Event
  profileData: PresentationProfileData | null
}): Promise<{ hash: string; version: number; index: number }> {
  const version = typeof params.tags.version === 'number' ? params.tags.version : 0
  const index = 0

  const fromIdTag = resolvePresentationIdPartsFromIdTag(params.tags.id, version, index)
  if (fromIdTag) {
    return fromIdTag
  }

  const mainnetAddress = resolvePresentationMainnetAddressCandidate(params.profileData, params.tags)
  const pictureUrl = resolvePresentationPictureUrlCandidate(params.profileData, params.tags)

  const hash = await generateAuthorHashId({
    pubkey: params.event.pubkey,
    authorName: resolveOptionalString(params.profileData?.authorName),
    presentation: resolveOptionalString(params.profileData?.presentation),
    contentDescription: resolveOptionalString(params.profileData?.contentDescription),
    mainnetAddress,
    pictureUrl,
    category: resolvePresentationHashCategory(params.profileData, params.tags),
  })

  return { hash, version, index }
}

function resolvePresentationIdPartsFromIdTag(
  idTag: string | undefined,
  defaultVersion: number,
  defaultIndex: number
): { hash: string; version: number; index: number } | undefined {
  if (!idTag) {
    return undefined
  }

  const parsed = parseObjectId(idTag)
  if (parsed.hash) {
    return {
      hash: parsed.hash,
      version: parsed.version ?? defaultVersion,
      index: parsed.index ?? defaultIndex,
    }
  }

  return { hash: idTag, version: defaultVersion, index: defaultIndex }
}

function buildPresentationArticle(params: {
  id: string
  hash: string
  version: number
  index: number
  event: Event
  tags: ReturnType<typeof extractTagsFromEvent>
  profileData: PresentationProfileData | null
  originalCategory: 'science-fiction' | 'scientific-research' | undefined
}): import('@/types/nostr').AuthorPresentationArticle {
  const description = resolvePresentationDescription(params.profileData, params.tags)
  const contentDescription = sanitizePresentationContentDescription(resolvePresentationContentDescriptionRaw(params.profileData, params.tags))
  const thumbnailUrl = resolvePresentationThumbnailUrl(params.profileData, params.tags)
  const mainnetAddress = resolvePresentationMainnetAddress(params.profileData, params.tags)
  const bannerUrl = resolvePresentationBannerUrl(params.profileData, params.tags)
  const title = resolvePresentationTitle(params.tags)
  const preview = resolvePresentationPreview(params.tags, params.event.content)

  return {
    id: params.id,
    hash: params.hash,
    version: params.version,
    index: params.index,
    pubkey: params.event.pubkey,
    title,
    preview,
    content: params.event.content,
    description,
    contentDescription,
    thumbnailUrl,
    createdAt: params.event.created_at,
    zapAmount: 0,
    paid: true,
    category: 'author-presentation',
    isPresentation: true,
    mainnetAddress,
    totalSponsoring: 0,
    originalCategory: params.originalCategory ?? 'science-fiction',
    ...(bannerUrl ? { bannerUrl } : {}),
  }
}

function resolvePresentationTitle(tags: ReturnType<typeof extractTagsFromEvent>): string {
  return typeof tags.title === 'string' && tags.title.length > 0 ? tags.title : 'Présentation'
}

function resolvePresentationPreview(tags: ReturnType<typeof extractTagsFromEvent>, content: string): string {
  if (typeof tags.preview === 'string' && tags.preview.length > 0) {
    return tags.preview
  }
  return content.substring(0, 200)
}

function resolvePresentationDescription(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string {
  if (typeof profileData?.presentation === 'string') {
    return profileData.presentation
  }
  return typeof tags.description === 'string' ? tags.description : ''
}

function resolvePresentationContentDescriptionRaw(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string {
  if (typeof profileData?.contentDescription === 'string') {
    return profileData.contentDescription
  }
  return typeof tags.description === 'string' ? tags.description : ''
}

function resolveOptionalString(value: unknown): string {
  return typeof value === 'string' ? value : ''
}

function resolvePresentationMainnetAddressCandidate(
  profileData: PresentationProfileData | null,
  tags: ReturnType<typeof extractTagsFromEvent>
): string | undefined {
  if (typeof profileData?.mainnetAddress === 'string') {
    return profileData.mainnetAddress
  }
  return typeof tags.mainnetAddress === 'string' ? tags.mainnetAddress : undefined
}

function resolvePresentationPictureUrlCandidate(
  profileData: PresentationProfileData | null,
  tags: ReturnType<typeof extractTagsFromEvent>
): string | undefined {
  if (typeof profileData?.pictureUrl === 'string') {
    return profileData.pictureUrl
  }
  return typeof tags.pictureUrl === 'string' ? tags.pictureUrl : undefined
}

function resolvePresentationHashCategory(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string {
  if (typeof profileData?.category === 'string') {
    return profileData.category
  }
  return typeof tags.category === 'string' ? tags.category : 'sciencefiction'
}

function sanitizePresentationContentDescription(raw: string): string {
  return raw
    .split('\n')
    .filter((line) => !line.includes('Adresse Bitcoin mainnet (pour le sponsoring)'))
    .join('\n')
    .trim()
}

function resolvePresentationThumbnailUrl(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string {
  if (typeof profileData?.pictureUrl === 'string') {
    return profileData.pictureUrl
  }
  return typeof tags.pictureUrl === 'string' ? tags.pictureUrl : ''
}

function resolvePresentationBannerUrl(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string | undefined {
  if (typeof profileData?.pictureUrl === 'string' && profileData.pictureUrl.length > 0) {
    return profileData.pictureUrl
  }
  return typeof tags.pictureUrl === 'string' ? tags.pictureUrl : undefined
}

function resolvePresentationMainnetAddress(profileData: PresentationProfileData | null, tags: ReturnType<typeof extractTagsFromEvent>): string {
  const fromProfile = profileData?.mainnetAddress
  if (typeof fromProfile === 'string') {
    return fromProfile
  }
  return typeof tags.mainnetAddress === 'string' ? tags.mainnetAddress : ''
}

function parsePresentationProfileJson(json: string): {
  authorName?: string
  presentation?: string
  contentDescription?: string
  mainnetAddress?: string
  pictureUrl?: string
  category?: string
} | null {
  try {
    const parsed: unknown = JSON.parse(json)
    if (typeof parsed !== 'object' || parsed === null) {
      return null
    }

    const obj = parsed as Record<string, unknown>
    const result: {
      authorName?: string
      presentation?: string
      contentDescription?: string
      mainnetAddress?: string
      pictureUrl?: string
      category?: string
    } = {}

    if (typeof obj.authorName === 'string') {
      result.authorName = obj.authorName
    }
    if (typeof obj.presentation === 'string') {
      result.presentation = obj.presentation
    }
    if (typeof obj.contentDescription === 'string') {
      result.contentDescription = obj.contentDescription
    }
    if (typeof obj.mainnetAddress === 'string') {
      result.mainnetAddress = obj.mainnetAddress
    }
    if (typeof obj.pictureUrl === 'string') {
      result.pictureUrl = obj.pictureUrl
    }
    if (typeof obj.category === 'string') {
      result.category = obj.category
    }

    return result
  } catch (error) {
    console.error('Error parsing presentation profile JSON:', error)
    return null
  }
}

export async function fetchAuthorPresentationFromPool(
  pool: SimplePoolWithSub,
  pubkey: string
): Promise<import('@/types/nostr').AuthorPresentationArticle | null> {
  // Check cache first - this is the primary source
  const cached = await objectCache.getAuthorByPubkey(pubkey)
  if (cached) {
    // Calculate totalSponsoring from cache
    const { getAuthorSponsoring } = await import('./sponsoring')
    cached.totalSponsoring = await getAuthorSponsoring(pubkey)
    return cached
  }

  const filters = [
    {
      ...buildTagFilter({
        type: 'author',
        authorPubkey: pubkey,
        service: PLATFORM_SERVICE,
      }),
      since: MIN_EVENT_DATE,
      limit: 100, // Get all versions to find the latest
    },
  ]

  return new Promise<import('@/types/nostr').AuthorPresentationArticle | null>((resolve) => {
    let resolved = false
    const relayUrl = getPrimaryRelaySync()
    const sub = createSubscription(pool, [relayUrl], filters)

    const events: Event[] = []

    const finalize = async (value: import('@/types/nostr').AuthorPresentationArticle | null): Promise<void> => {
      if (resolved) {
        return
      }
      resolved = true
      sub.unsub()

      // Cache the result if found
      if (value && events.length > 0) {
        const event = events.find((e) => e.id === value.id) ?? events[0]
        if (event) {
          const tags = extractTagsFromEvent(event)
          if (value.hash) {
            // Calculate totalSponsoring from cache before storing
            const { getAuthorSponsoring } = await import('./sponsoring')
            const totalSponsoring = await getAuthorSponsoring(value.pubkey)
            const cachedValue: import('@/types/nostr').AuthorPresentationArticle = {
              ...value,
              totalSponsoring,
            }
            const { writeObjectToCache } = await import('./helpers/writeObjectHelper')
            await writeObjectToCache({
              objectType: 'author',
              hash: value.hash,
              event,
              parsed: cachedValue,
              version: tags.version,
              hidden: tags.hidden,
              index: value.index,
            })

            resolve(cachedValue)
            return
          }
        }
      }

      resolve(value)
    }

    sub.on('event', (event: Event): void => {
      // Collect all events first
      const tags = extractTagsFromEvent(event)
      if (tags.type === 'author' && !tags.hidden) {
        events.push(event)
      }
    })

    sub.on('eose', (): void => {
      void (async (): Promise<void> => {
        // Get the latest version from all collected events
        const latestEvent = getLatestVersion(events)
        if (latestEvent) {
          const parsed = await parsePresentationEvent(latestEvent)
          if (parsed) {
            await finalize(parsed)
            return
          }
        }
        await finalize(null)
      })()
    })
    // Reduced timeout for faster feedback when cache is empty
    setTimeout((): void => {
      void (async (): Promise<void> => {
      // Get the latest version from all collected events
      const latestEvent = getLatestVersion(events)
      if (latestEvent) {
        const parsed = await parsePresentationEvent(latestEvent)
        if (parsed) {
          await finalize(parsed)
          return
        }
      }
      await finalize(null)
      })()
    }, 2000).unref?.()
  })
}