import { nip19 } from 'nostr-tools'
import type { AuthorPresentationDraft } from '../articlePublisher'
import { buildTags } from '../nostrTagSystem'
import { PLATFORM_SERVICE } from '../platformConfig'
import { generateAuthorHashId } from '../hashIdGenerator'
import { generateObjectUrl } from '../urlGenerator'
import { parseAuthorPresentationDraft } from '../authorPresentationParsing'

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, version, index } = normalizeBuildPresentationEventParams(params)
  const parsedDraft = parseAuthorPresentationDraft(params.draft)
  const hashId = await generateAuthorHashIdForPresentation({
    authorPubkey: params.authorPubkey,
    authorName: params.authorName,
    parsedDraft,
    mainnetAddress: params.draft.mainnetAddress,
    pictureUrl: params.draft.pictureUrl,
    category,
  })
  const profileUrl = generateObjectUrl('author', hashId, index, version)
  const visibleContent = buildPresentationVisibleContent({
    profileUrl,
    authorName: params.authorName,
    pictureUrl: params.draft.pictureUrl,
    presentation: parsedDraft.presentation,
    contentDescription: parsedDraft.contentDescription,
  })
  const profileJson = buildPresentationProfileJson({
    authorPubkey: params.authorPubkey,
    authorName: params.authorName,
    profileUrl,
    presentation: parsedDraft.presentation,
    contentDescription: parsedDraft.contentDescription,
    mainnetAddress: params.draft.mainnetAddress,
    pictureUrl: params.draft.pictureUrl,
    category,
    version,
    index,
  })
  const tags = buildPresentationTags({ draft: params.draft, category, hashId, version, profileJson })
  return { kind: 1 as const, created_at: Math.floor(Date.now() / 1000), tags, content: visibleContent }
}

function normalizeBuildPresentationEventParams(params: BuildPresentationEventParams): { category: 'sciencefiction' | 'research'; version: number; index: number } {
  return { category: params.category ?? 'sciencefiction', version: params.version ?? 0, index: params.index ?? 0 }
}

async function generateAuthorHashIdForPresentation(params: {
  authorPubkey: string
  authorName: string
  parsedDraft: { presentation: string; contentDescription: string }
  mainnetAddress: string | undefined
  pictureUrl: string | undefined
  category: 'sciencefiction' | 'research'
}): Promise<string> {
  return generateAuthorHashId({
    pubkey: params.authorPubkey,
    authorName: params.authorName,
    presentation: params.parsedDraft.presentation,
    contentDescription: params.parsedDraft.contentDescription,
    mainnetAddress: params.mainnetAddress ?? undefined,
    pictureUrl: params.pictureUrl ?? undefined,
    category: params.category,
  })
}

function buildPresentationVisibleContent(params: {
  profileUrl: string
  authorName: string
  pictureUrl: string | undefined
  presentation: string
  contentDescription: string
}): string {
  const linkWithPreview = buildProfileLink({ profileUrl: params.profileUrl, authorName: params.authorName, pictureUrl: params.pictureUrl })
  const lines = [
    'Nouveau profil auteur publié sur zapwall.fr (plateforme de publications scientifiques)',
    linkWithPreview,
    `Présentation personnelle : ${params.presentation}`,
  ]
  if (params.contentDescription) {
    lines.push(`Description de votre contenu : ${params.contentDescription}`)
  }
  return lines.join('\n')
}

function buildPresentationProfileJson(params: {
  authorPubkey: string
  authorName: string
  profileUrl: string
  presentation: string
  contentDescription: string
  mainnetAddress: string | undefined
  pictureUrl: string | undefined
  category: 'sciencefiction' | 'research'
  version: number
  index: number
}): string {
  const npub = nip19.npubEncode(params.authorPubkey)
  return JSON.stringify({
    authorName: params.authorName,
    npub,
    pubkey: params.authorPubkey,
    presentation: params.presentation,
    contentDescription: params.contentDescription,
    mainnetAddress: params.mainnetAddress,
    pictureUrl: params.pictureUrl,
    category: params.category,
    url: params.profileUrl,
    version: params.version,
    index: params.index,
  })
}

function buildPresentationTags(params: { draft: AuthorPresentationDraft; category: 'sciencefiction' | 'research'; hashId: string; version: number; profileJson: string }): string[][] {
  const tags = buildTags({
    type: 'author',
    category: params.category,
    id: params.hashId,
    service: PLATFORM_SERVICE,
    version: params.version,
    hidden: false,
    paywall: false,
    title: params.draft.title,
    preview: params.draft.preview,
    mainnetAddress: params.draft.mainnetAddress,
    ...(params.draft.pictureUrl ? { pictureUrl: params.draft.pictureUrl } : {}),
  })
  tags.push(['json', params.profileJson])
  return tags
}

function buildProfileLink(params: { profileUrl: string; authorName: string; pictureUrl: string | undefined }): string {
  if (params.pictureUrl) {
    return `[![${params.authorName}](${params.pictureUrl})](${params.profileUrl})`
  }
  return params.profileUrl
}