import { Event } from 'nostr-tools'
import { getImetaInfosFromEvent } from '@/lib/event'
import { cleanUrl, isImage, isMedia, isAudio, isVideo, isHlsPlaylistUrl } from '@/lib/url'

/** Any URL we may embed or extract from note bodies (incl. video-only extensions like .3gp, HLS manifests). */
function isEmbeddableMediaUrl(cleaned: string): boolean {
  return isImage(cleaned) || isMedia(cleaned) || isVideo(cleaned) || isAudio(cleaned) || isHlsPlaylistUrl(cleaned)
}
import { TImetaInfo } from '@/types'
import mediaUpload from './media-upload.service'
import { getImetaInfoFromImetaTag } from '@/lib/tag'

export interface ExtractedMedia {
  images: TImetaInfo[]
  videos: TImetaInfo[]
  audio: TImetaInfo[]
  all: TImetaInfo[]
}

/**
 * Unified service for extracting all media (images, videos, audio) from an event
 * Sources: imeta tags, image tags, and content field (not `r` tags — those are references, not media embeds)
 */
export function extractAllMediaFromEvent(
  event: Event,
  content?: string
): ExtractedMedia {
  const textBody = content ?? event.content ?? ''
  const seenUrls = new Set<string>()
  const allMedia: TImetaInfo[] = []

  // Helper to add media if not already seen (using cleaned URL for comparison)
  const addMedia = (url: string, pubkey?: string, mimeType?: string) => {
    if (!url) return
    const cleaned = cleanUrl(url)
    if (!cleaned || seenUrls.has(cleaned)) return

    if (!isEmbeddableMediaUrl(cleaned)) return

    seenUrls.add(cleaned)

    // Determine mime type if not provided
    let mime = mimeType
    if (!mime) {
      if (isImage(cleaned)) {
        mime = 'image/*'
      } else if (isHlsPlaylistUrl(cleaned)) {
        mime = 'video/*'
      } else if (isAudio(cleaned)) {
        mime = 'audio/*'
      } else if (isVideo(cleaned)) {
        mime = 'video/*'
      } else {
        mime = 'media/*'
      }
    }

    allMedia.push({
      url: cleaned,
      pubkey: pubkey || event.pubkey,
      m: mime
    })
  }

  // 1. Extract from imeta tags (keep full metadata: alt, dim, blurHash, etc.)
  const imetaInfos = getImetaInfosFromEvent(event)
  imetaInfos.forEach((info) => {
    const cleaned = cleanUrl(info.url)
    if (!cleaned || seenUrls.has(cleaned)) return
    const nip94Signals = !!(info.blurHash || info.dim || info.x)
    if (
      info.m?.startsWith('image/') ||
      info.m?.startsWith('video/') ||
      info.m?.startsWith('audio/') ||
      info.m === 'application/vnd.apple.mpegurl' ||
      isImage(info.url) ||
      isMedia(info.url) ||
      isVideo(info.url) ||
      isAudio(info.url) ||
      isHlsPlaylistUrl(info.url) ||
      // Blossom / NIP-94 URLs often have no file extension; metadata still identifies the blob.
      (nip94Signals && !!info.url)
    ) {
      seenUrls.add(cleaned)
      allMedia.push({ ...info, url: cleaned })
    }
  })

  // Non-standard imeta layouts (no `url ` prefix, concatenated fields, etc.)
  const looseHttpsFromImetaValue = (s: string): string[] => {
    const out: string[] = []
    const re = /https?:\/\/[^\s<>"'[\]()]+/gi
    let m: RegExpExecArray | null
    re.lastIndex = 0
    while ((m = re.exec(s)) !== null) {
      out.push(m[0])
    }
    return out
  }

  event.tags.forEach((tag) => {
    if (tag[0] !== 'imeta') return
    if (getImetaInfoFromImetaTag(tag, event.pubkey)) return
    for (let i = 1; i < tag.length; i++) {
      const part = tag[i]
      if (typeof part !== 'string') continue
      for (const raw of looseHttpsFromImetaValue(part)) {
        addMedia(raw, event.pubkey)
      }
    }
  })

  // 2. Extract from image tag
  const imageTag = event.tags.find((tag) => tag[0] === 'image' && tag[1])
  if (imageTag?.[1]) {
    addMedia(imageTag[1])
  }

  // 3. Live streams in `r` tags (often next to imeta for poster / blurhash)
  event.tags.forEach((tag) => {
    if (tag[0] !== 'r' || !tag[1]) return
    const c = cleanUrl(tag[1]) || tag[1]
    if (isHlsPlaylistUrl(c)) {
      addMedia(tag[1], event.pubkey, 'video/*')
    }
  })

  // 4. Extract from note content (plain URLs, markdown images) — callers may omit `content`; default to `event.content`.
  if (textBody) {
    // First, extract from markdown image syntax: ![alt](url) or [![](url)](link)
    // This handles images inside links
    const markdownImageRegex = /!\[[^\]]*\]\(([^)]+)\)/g
    let imgMatch
    while ((imgMatch = markdownImageRegex.exec(textBody)) !== null) {
      if (imgMatch[1]) {
        const url = imgMatch[1]
        if (isEmbeddableMediaUrl(cleanUrl(url) || url)) {
          addMedia(url)
        }
      }
    }
    
    // Then extract directly from raw content (catch any URLs that weren't parsed)
    const urlRegex = /https?:\/\/[^\s<>"']+/g
    const urlMatches = textBody.matchAll(urlRegex)
    for (const match of urlMatches) {
      const url = match[0]
      const c = cleanUrl(url) || url
      if (isEmbeddableMediaUrl(c)) {
        addMedia(url)
      }
    }
  }

  // 6. Try to match content URLs with imeta tags for better metadata (alt, dim, blurHash, m)
  const imageIdentityKey = (url: string): string | null => {
    try {
      const u = cleanUrl(url)
      if (!u) return null
      const pathname = new URL(u).pathname
      const filename = pathname.split('/').pop() || ''
      if (filename && /^[a-f0-9]{32,}\.(png|jpg|jpeg|gif|webp|svg|avif|apng)$/i.test(filename)) {
        return filename.toLowerCase()
      }
      return u
    } catch {
      return cleanUrl(url) || null
    }
  }

  imetaInfos.forEach((imeta) => {
    const imetaUrl = cleanUrl(imeta.url)
    const imetaKey = imetaUrl ? imageIdentityKey(imetaUrl) : null
    allMedia.forEach((media, index) => {
      if (imetaUrl && imetaUrl === media.url) {
        allMedia[index] = { ...media, ...imeta, url: media.url }
      } else if (imetaKey && imetaKey === imageIdentityKey(media.url)) {
        allMedia[index] = { ...media, ...imeta, url: media.url }
      } else {
        // Try to get imeta from media upload service
        const tag = mediaUpload.getImetaTagByUrl(media.url)
        if (tag) {
          const parsedImeta = getImetaInfoFromImetaTag(tag, event.pubkey)
          if (parsedImeta) {
            allMedia[index] = { ...media, ...parsedImeta, url: media.url }
          }
        }
      }
    })
  })

  // Categorize media
  const images: TImetaInfo[] = []
  const videos: TImetaInfo[] = []
  const audio: TImetaInfo[] = []

  allMedia.forEach((media) => {
    if (media.m?.startsWith('image/') || isImage(media.url)) {
      images.push(media)
    } else if (media.m?.startsWith('video/') || isVideo(media.url) || isHlsPlaylistUrl(media.url)) {
      videos.push(media)
    } else if (media.m?.startsWith('audio/') || isAudio(media.url)) {
      audio.push(media)
    } else {
      // Fallback: try to determine by URL extension
      if (isImage(media.url)) {
        images.push(media)
      } else if (isVideo(media.url) || isHlsPlaylistUrl(media.url)) {
        videos.push(media)
      } else if (isAudio(media.url)) {
        audio.push(media)
      }
    }
  })

  return {
    images,
    videos,
    audio,
    all: allMedia
  }
}