import type { Event } from 'nostr-tools'
import type { Article, KindType, Review, Series } from '@/types/nostr'
import { extractTagsFromEvent } from './nostrTagSystem'

/**
 * Parse article metadata from Nostr event
 * Uses new tag system: #publication, #sciencefiction|research, #id_<id>, #paywall, #payment
 */
export function parseArticleFromEvent(event: Event): 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 as string | undefined)
    return buildArticle(event, tags, previewContent)
  } catch (e) {
    console.error('Error parsing article:', e)
    return null
  }
}

export function parseSeriesFromEvent(event: Event): 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'
    const series: Series = {
      id: tags.id ?? event.id,
      pubkey: event.pubkey,
      title: tags.title as string,
      description: tags.description as string,
      preview: (tags.preview as string | undefined) ?? event.content.substring(0, 200),
      category,
      ...(tags.coverUrl ? { coverUrl: tags.coverUrl as string } : {}),
    }
    series.kindType = 'series'
    return series
  } catch (e) {
    console.error('Error parsing series:', e)
    return null
  }
}

export function parseReviewFromEvent(event: Event): 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.articleId as string | undefined
    const reviewer = tags.reviewerPubkey as string | undefined
    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')

    const review: Review = {
      id: tags.id ?? event.id,
      articleId,
      authorPubkey: event.pubkey,
      reviewerPubkey: reviewer,
      content: event.content,
      createdAt: event.created_at,
      ...(tags.title ? { title: tags.title as string } : {}),
      ...(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 }
}

function buildArticle(event: Event, tags: ReturnType<typeof extractTagsFromEvent>, preview: string): 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'

  return {
    id: tags.id ?? event.id,
    pubkey: event.pubkey,
    title: tags.title ?? 'Untitled',
    preview,
    content: '',
    createdAt: event.created_at,
    zapAmount: tags.zapAmount ?? 800,
    paid: false,
    ...(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 } : {}),
    ...(tags.type === 'publication' ? { kindType: 'article' as KindType } : tags.type === 'author' ? { kindType: 'article' as KindType } : {}),
  }
}