import type { Event } from 'nostr-tools'
import type { Article, KindType, Purchase, Review, ReviewTip, Series, Sponsoring } from '@/types/nostr'
import { extractTagsFromEvent } from './nostrTagSystem'
import { buildObjectId, parseObjectId } from './urlGenerator'
import { generateHashId } from './hashIdGenerator'
import { extractPurchaseFromEvent, extractReviewTipFromEvent, extractSponsoringFromEvent } from './metadataExtractor'

/**
 * Parse article metadata from Nostr event
 * Uses new tag system: #publication, #sciencefiction|research, #id_<id>, #paywall, #payment
 */
export async function parseArticleFromEvent(event: Event): Promise<Article | null> {
  try {
    const tags = extractTagsFromEvent(event)
    // Check if it's a publication type
    if (tags.type !== 'publication') {
      return null
    }
    const { previewContent } = getPreviewContent(event.content, tags.preview)
    return await buildArticle(event, tags, previewContent)
  } catch (e) {
    console.error('Error parsing article:', e)
    return null
  }
}

export async function parseSeriesFromEvent(event: Event): Promise<Series | null> {
  try {
    const tags = extractTagsFromEvent(event)
    // Check if it's a series type (tag is 'series' in English)
    if (tags.type !== 'series') {
      return null
    }
    if (!tags.title || !tags.description) {
      return null
    }
    // Map category from new system to old system
    const category = tags.category === 'sciencefiction' ? 'science-fiction' : tags.category === 'research' ? 'scientific-research' : 'science-fiction'

    // Extract hash, version, index from id tag or parse it
    let hash: string
    let version = tags.version ?? 0
    let index = 0

    if (tags.id) {
      const parsed = parseObjectId(tags.id)
      if (parsed.hash) {
        hash = parsed.hash
        version = parsed.version ?? version
        index = parsed.index ?? index
      } else {
        // If id is just a hash, use it directly
        hash = tags.id
      }
    } else {
      // Generate hash from series data
      hash = await generateHashId({
        type: 'series',
        pubkey: event.pubkey,
        title: tags.title,
        description: tags.description,
        category: tags.category ?? 'sciencefiction',
        coverUrl: tags.coverUrl ?? '',
      })
    }

    const id = buildObjectId(hash, index, version)

    const series: Series = {
      id,
      hash,
      version,
      index,
      pubkey: event.pubkey,
      title: tags.title,
      description: tags.description,
      preview: (tags.preview) ?? event.content.substring(0, 200),
      thumbnailUrl: tags.coverUrl ?? '', // Use coverUrl as thumbnail if available
      category,
      ...(tags.coverUrl ? { coverUrl: tags.coverUrl } : {}),
    }
    series.kindType = 'series'
    return series
  } catch (e) {
    console.error('Error parsing series:', e)
    return null
  }
}

export async function parseReviewFromEvent(event: Event): Promise<Review | null> {
  try {
    const tags = extractTagsFromEvent(event)
    // Check if it's a quote type (reviews are quotes, tag is 'quote' in English)
    if (tags.type !== 'quote') {
      return null
    }
    const {articleId} = tags
    const reviewer = tags.reviewerPubkey
    if (!articleId || !reviewer) {
      return null
    }
    const rewardedTag = event.tags.find((tag) => tag[0] === 'rewarded' && tag[1] === 'true')
    const rewardAmountTag = event.tags.find((tag) => tag[0] === 'reward_amount')

    // Extract hash, version, index from id tag or parse it
    let hash: string
    let version = tags.version ?? 0
    let index = 0

    if (tags.id) {
      const parsed = parseObjectId(tags.id)
      if (parsed.hash) {
        hash = parsed.hash
        version = parsed.version ?? version
        index = parsed.index ?? index
      } else {
        // If id is just a hash, use it directly
        hash = tags.id
      }
    } else {
      // Generate hash from review data
      hash = await generateHashId({
        type: 'quote',
        pubkey: event.pubkey,
        articleId,
        reviewerPubkey: reviewer,
        content: event.content,
        title: tags.title ?? '',
      })
    }

    const id = buildObjectId(hash, index, version)

    // Extract text from tags if present
    const textTag = event.tags.find((tag) => tag[0] === 'text')?.[1]

    const review: Review = {
      id,
      hash,
      version,
      index,
      articleId,
      authorPubkey: event.pubkey,
      reviewerPubkey: reviewer,
      content: event.content,
      description: tags.description ?? '', // Required field with default
      createdAt: event.created_at,
      ...(tags.title ? { title: tags.title } : {}),
      ...(textTag ? { text: textTag } : {}),
      ...(rewardedTag ? { rewarded: true } : {}),
      ...(rewardAmountTag ? { rewardAmount: parseInt(rewardAmountTag[1] ?? '0', 10) } : {}),
    }
    review.kindType = 'review'
    return review
  } catch (e) {
    console.error('Error parsing review:', e)
    return null
  }
}


function getPreviewContent(content: string, previewTag?: string) {
  const lines = content.split('\n')
  const previewContent = previewTag ?? lines[0] ?? content.substring(0, 200)
  return { previewContent }
}

async function buildArticle(event: Event, tags: ReturnType<typeof extractTagsFromEvent>, preview: string): Promise<Article> {
  // Map category from new system to old system
  const category = tags.category === 'sciencefiction' ? 'science-fiction' : tags.category === 'research' ? 'scientific-research' : undefined
  const isPresentation = tags.type === 'author'

  // Extract hash, version, index from id tag or parse it
  let hash: string
  let version = tags.version ?? 0
  let index = 0

  if (tags.id) {
    const parsed = parseObjectId(tags.id)
    if (parsed.hash) {
      hash = parsed.hash
      version = parsed.version ?? version
      index = parsed.index ?? index
    } else {
      // If id is just a hash, use it directly
      hash = tags.id
    }
  } else {
    // Generate hash from article data
    hash = await generateHashId({
      type: isPresentation ? 'author' : 'publication',
      pubkey: event.pubkey,
      title: tags.title ?? 'Untitled',
      preview,
      category: tags.category ?? 'sciencefiction',
      seriesId: tags.seriesId ?? '',
      bannerUrl: tags.bannerUrl ?? '',
      zapAmount: tags.zapAmount ?? 800,
    })
  }

  const id = buildObjectId(hash, index, version)

  // Extract pages from JSON metadata if present
  let pages: Page[] | undefined
  try {
    const jsonTag = event.tags.find((tag) => tag[0] === 'json')?.[1]
    if (jsonTag) {
      const metadata = JSON.parse(jsonTag) as { pages?: Page[] }
      if (metadata.pages && Array.isArray(metadata.pages)) {
        pages = metadata.pages
      }
    }
  } catch (e) {
    // Ignore JSON parsing errors
  }

  return {
    id,
    hash,
    version,
    index,
    pubkey: event.pubkey,
    title: tags.title ?? 'Untitled',
    preview,
    content: '',
    description: tags.description ?? '', // Required field with default
    contentDescription: tags.description ?? '', // Required field with default (can be improved later)
    createdAt: event.created_at,
    zapAmount: tags.zapAmount ?? 800,
    paid: false,
    thumbnailUrl: tags.bannerUrl ?? tags.pictureUrl ?? '', // Required field with default
    ...(tags.invoice ? { invoice: tags.invoice } : {}),
    ...(tags.paymentHash ? { paymentHash: tags.paymentHash } : {}),
    ...(category ? { category } : {}),
    ...(isPresentation ? { isPresentation: true } : {}),
    ...(tags.mainnetAddress ? { mainnetAddress: tags.mainnetAddress } : {}),
    ...(tags.totalSponsoring ? { totalSponsoring: tags.totalSponsoring } : {}),
    ...(tags.seriesId ? { seriesId: tags.seriesId } : {}),
    ...(tags.bannerUrl ? { bannerUrl: tags.bannerUrl } : {}),
    ...(pages && pages.length > 0 ? { pages } : {}),
    ...(tags.type === 'publication' ? { kindType: 'article' as KindType } : tags.type === 'author' ? { kindType: 'article' as KindType } : {}),
  }
}

/**
 * Parse purchase from zap receipt event (kind 9735)
 */
export async function parsePurchaseFromEvent(event: Event): Promise<Purchase | null> {
  try {
    const extracted = await extractPurchaseFromEvent(event)
    if (!extracted) {
      return null
    }

    // Extract hash, version, index from id
    const parsed = parseObjectId(extracted.id)
    const hash = parsed.hash ?? extracted.id
    const version = parsed.version ?? 0
    const index = parsed.index ?? 0
    const id = buildObjectId(hash, index, version)

    return {
      id,
      hash,
      version,
      index,
      payerPubkey: extracted.payerPubkey,
      articleId: extracted.articleId,
      authorPubkey: extracted.authorPubkey,
      amount: extracted.amount,
      paymentHash: extracted.paymentHash,
      createdAt: event.created_at,
      kindType: 'purchase',
    }
  } catch (e) {
    console.error('Error parsing purchase:', e)
    return null
  }
}

/**
 * Parse sponsoring from zap receipt event (kind 9735)
 */
export async function parseSponsoringFromEvent(event: Event): Promise<Sponsoring | null> {
  try {
    const extracted = await extractSponsoringFromEvent(event)
    if (!extracted) {
      return null
    }

    // Extract hash, version, index from id
    const parsed = parseObjectId(extracted.id)
    const hash = parsed.hash ?? extracted.id
    const version = parsed.version ?? 0
    const index = parsed.index ?? 0
    const id = buildObjectId(hash, index, version)

    // Extract text from tags if present
    const textTag = event.tags.find((tag) => tag[0] === 'text')?.[1]

    return {
      id,
      hash,
      version,
      index,
      payerPubkey: extracted.payerPubkey,
      authorPubkey: extracted.authorPubkey,
      amount: extracted.amount,
      paymentHash: extracted.paymentHash,
      createdAt: event.created_at,
      ...(extracted.seriesId ? { seriesId: extracted.seriesId } : {}),
      ...(extracted.articleId ? { articleId: extracted.articleId } : {}),
      ...(textTag ? { text: textTag } : {}),
      kindType: 'sponsoring',
    }
  } catch (e) {
    console.error('Error parsing sponsoring:', e)
    return null
  }
}

/**
 * Parse review tip from zap receipt event (kind 9735)
 */
export async function parseReviewTipFromEvent(event: Event): Promise<ReviewTip | null> {
  try {
    const extracted = await extractReviewTipFromEvent(event)
    if (!extracted) {
      return null
    }

    // Extract hash, version, index from id
    const parsed = parseObjectId(extracted.id)
    const hash = parsed.hash ?? extracted.id
    const version = parsed.version ?? 0
    const index = parsed.index ?? 0
    const id = buildObjectId(hash, index, version)

    // Extract text from tags if present
    const textTag = event.tags.find((tag) => tag[0] === 'text')?.[1]

    return {
      id,
      hash,
      version,
      index,
      payerPubkey: extracted.payerPubkey,
      articleId: extracted.articleId,
      reviewId: extracted.reviewId,
      reviewerPubkey: extracted.reviewerPubkey,
      authorPubkey: extracted.authorPubkey,
      amount: extracted.amount,
      paymentHash: extracted.paymentHash,
      createdAt: event.created_at,
      ...(textTag ? { text: textTag } : {}),
      kindType: 'review_tip',
    }
  } catch (e) {
    console.error('Error parsing review tip:', e)
    return null
  }
}