import { proxyImageUrl } from './proxy-image'

type Source = 'ophim' | 'nguonc' | 'kkphim'
type SourceFilter = Source | 'all'

export interface NormalizedMovie {
  id: string
  source: Source
  name: string
  originName: string
  slug: string
  thumb: string
  poster: string
  year?: number
  time?: string
  episode?: string
  episodeTotal?: string
  quality?: string
  lang?: string
  type?: string
  rating?: number
  updatedAt?: string
  categories: string[]
  countries: string[]
  sources?: MovieSourceRef[]
}

export interface MovieSourceRef {
  source: Source
  slug: string
  name?: string
  episode?: string
  episodeTotal?: string
}

export interface NormalizedEpisode {
  name: string
  slug?: string
  linkEmbed?: string
  linkM3u8?: string
}

export interface NormalizedServer {
  name: string
  source?: Source
  sourceSlug?: string
  sourceServerIndex?: number
  episodes: NormalizedEpisode[]
}

export interface NormalizedActor {
  name: string
  originalName?: string
  role?: string
  avatar?: string
}

export interface MovieDetail extends NormalizedMovie {
  content: string
  actors: NormalizedActor[]
  directors: string[]
  trailer?: string
  servers: NormalizedServer[]
}

const OPHIM_BASE = 'https://ophim1.com'
const OPHIM_IMAGE = 'https://img.ophim.live/uploads/movies/'
const NGUONC_BASE = 'https://phim.nguonc.com'
const KKPHIM_BASE = 'https://phimapi.com'
const KKPHIM_IMAGE = 'https://phimimg.com/'
const SOURCE_NAMES: Source[] = ['nguonc', 'ophim', 'kkphim']
const DEFAULT_SOURCE: Source = 'nguonc'

function toArray<T>(value: T[] | T | undefined | null): T[] {
  if (!value) return []
  return Array.isArray(value) ? value : [value]
}

function text(value: unknown, fallback = '') {
  return typeof value === 'string' ? value : fallback
}

function joinImage(base: string, path?: string) {
  if (!path) return ''
  if (/^https?:\/\//i.test(path)) return path
  const cleanBase = base.endsWith('/') ? base : `${base}/`
  const cleanPath = path.startsWith('/') ? path.slice(1) : path
  return `${cleanBase}${cleanPath}`
}

function joinOphimImage(base: string, path?: string) {
  if (!path) return ''
  if (/^https?:\/\//i.test(path)) return path

  const url = new URL(base)
  const cleanPath = path.startsWith('/') ? path.slice(1) : path
  const basePath = url.pathname.replace(/\/$/, '')

  if (cleanPath.startsWith('uploads/')) {
    url.pathname = cleanPath
  } else if (basePath.includes('/uploads/movies')) {
    url.pathname = `${basePath}/${cleanPath}`
  } else {
    url.pathname = `/uploads/movies/${cleanPath}`
  }

  return url.toString()
}

function joinKkphimImage(base: string, path?: string) {
  if (!path) return ''
  if (/^https?:\/\//i.test(path)) return path

  const url = new URL(base)
  const cleanPath = path.startsWith('/') ? path.slice(1) : path
  const basePath = url.pathname.replace(/\/$/, '')
  url.pathname = basePath && basePath !== '/' ? `${basePath}/${cleanPath}` : cleanPath

  return url.toString()
}

function includesKorea(movie: any) {
  const countries = toArray(movie?.country ?? movie?.countries ?? movie?.quoc_gia)
  if (!countries.length) return true

  return countries.some((country: any) => {
    const slug = text(country?.slug ?? country).toLowerCase()
    const name = text(country?.name ?? country).toLowerCase()
    return slug === 'han-quoc' || name.includes('hàn quốc') || name.includes('han quoc')
  })
}

function stripHtml(value?: string) {
  return text(value)
    .replace(/<[^>]+>/g, ' ')
    .replace(/\s+/g, ' ')
    .trim()
}

function comparableText(value?: string) {
  return text(value)
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '')
}

function compactTitleKey(value?: string) {
  return comparableText(value)
    .replace(/\b(vietsub|thuyet-minh|long-tieng|hd|full-hd|fhd|bluray|web-dl|webdl)\b/g, '')
    .replace(/\b(phan|mua|season|part|ss|s)-?(\d+)\b/g, 's$2')
    .replace(/\b(19|20)\d{2}\b/g, '')
    .replace(/-{2,}/g, '-')
    .replace(/^-+|-+$/g, '')
}

function movieTitleAliases(movie: NormalizedMovie) {
  const aliases = new Set<string>()
  const values = [
    movie.originName,
    movie.name,
    movie.slug,
  ]

  for (const value of values) {
    const key = compactTitleKey(value)
    if (!key || key.length < 3) continue
    aliases.add(key)

    const seriesLike = movie.type !== 'single' || !/^(full|hoan-tat)$/i.test(String(movie.episode || ''))
    if (seriesLike) {
      aliases.add(key.replace(/-(\d+)$/, '-s$1'))
      aliases.add(key.replace(/-s(\d+)$/, '-$1'))
    }
  }

  return [...aliases]
}

function movieSourceRef(movie: NormalizedMovie): MovieSourceRef {
  return {
    source: movie.source,
    slug: movie.slug,
    name: movie.name,
    episode: movie.episode,
    episodeTotal: movie.episodeTotal,
  }
}

function isSource(value: unknown): value is Source {
  return typeof value === 'string' && SOURCE_NAMES.includes(value as Source)
}

function interleaveMovies(groups: NormalizedMovie[][]) {
  const maxLength = Math.max(0, ...groups.map((items) => items.length))
  const interleaved: NormalizedMovie[] = []

  for (let index = 0; index < maxLength; index += 1) {
    for (const items of groups) {
      const movie = items[index]
      if (movie) interleaved.push(movie)
    }
  }

  return interleaved
}

function extractEpisodeNumber(value?: string): number {
  if (!value) return 0
  const match = value.match(/(\d+)(?:\/\d+)?\s*$/)
  if (!match) {
    const anyNumber = value.match(/\d+/)
    return anyNumber ? Number(anyNumber[0]) : 0
  }
  return Number(match[1])
}

export function groupMovies(items: NormalizedMovie[]) {
  const groups = new Map<string, NormalizedMovie>()
  const exactAliases = new Map<string, string>()
  const looseAliases = new Map<string, string>()
  const looseAliasCollisions = new Set<string>()

  function rememberLooseAlias(alias: string, groupKey: string) {
    const existingGroupKey = looseAliases.get(alias)
    if (!existingGroupKey) {
      looseAliases.set(alias, groupKey)
      return
    }

    if (existingGroupKey !== groupKey) {
      looseAliasCollisions.add(alias)
    }
  }

  for (const movie of items) {
    const aliases = movieTitleAliases(movie)
    const key = aliases[0]
    const fallbackKey = `${movie.source}:${movie.slug || movie.name}`
    const exactKeys = movie.year ? aliases.map((alias) => `${alias}:${movie.year}`) : []
    const existingGroupKey = exactKeys
      .map((alias) => exactAliases.get(alias))
      .find(Boolean)
      || aliases
        .map((alias) => looseAliasCollisions.has(alias) ? undefined : looseAliases.get(alias))
        .find(Boolean)
    const groupKey = existingGroupKey || (movie.year && key ? `${key}:${movie.year}` : key) || fallbackKey
    const existing = groups.get(groupKey)
    if (!existing) {
      groups.set(groupKey, {
        ...movie,
        sources: [movieSourceRef(movie)],
      })
      for (const alias of aliases) {
        if (movie.year) exactAliases.set(`${alias}:${movie.year}`, groupKey)
        rememberLooseAlias(alias, groupKey)
      }
      continue
    }

    const existingRef = existing.sources?.find((source) => source.source === movie.source && source.slug === movie.slug)
    if (existingRef) {
      existingRef.episode = movie.episode
      existingRef.episodeTotal = movie.episodeTotal
    } else {
      existing.sources = [...(existing.sources || []), movieSourceRef(movie)]
    }

    existing.thumb ||= movie.thumb
    existing.poster ||= movie.poster
    existing.originName ||= movie.originName
    existing.rating ||= movie.rating
    existing.categories = [...new Set([...existing.categories, ...movie.categories])]
    existing.countries = [...new Set([...existing.countries, ...movie.countries])]
    existing.updatedAt = existing.updatedAt && movie.updatedAt
      ? (new Date(existing.updatedAt).getTime() > new Date(movie.updatedAt).getTime() ? existing.updatedAt : movie.updatedAt)
      : existing.updatedAt || movie.updatedAt

    const existingCurrent = extractEpisodeNumber(existing.episode)
    const newCurrent = extractEpisodeNumber(movie.episode)
    if (newCurrent > existingCurrent) {
      existing.episode = movie.episode
    }
    const existingTotal = extractEpisodeNumber(existing.episodeTotal)
    const newTotal = extractEpisodeNumber(movie.episodeTotal)
    if (newTotal > existingTotal) {
      existing.episodeTotal = movie.episodeTotal
    }

    for (const alias of aliases) {
      if (movie.year) exactAliases.set(`${alias}:${movie.year}`, groupKey)
      rememberLooseAlias(alias, groupKey)
    }
  }

  return [...groups.values()]
}

function normalizeActor(actor: any): NormalizedActor | undefined {
  if (typeof actor === 'string') {
    const name = actor.trim()
    return name ? { name } : undefined
  }

  const name = text(actor?.name || actor?.actor_name || actor?.title).trim()
  if (!name) return undefined

  const avatarUrl = joinImage('', actor?.avatar || actor?.image || actor?.thumb_url || actor?.poster_url)
  return {
    name,
    originalName: text(actor?.original_name || actor?.origin_name || actor?.real_name) || undefined,
    role: text(actor?.role || actor?.character || actor?.as || actor?.cast_name) || undefined,
    avatar: proxyImageUrl(avatarUrl),
  }
}

export function normalizeOphimMovie(movie: any, pathImage = OPHIM_IMAGE): NormalizedMovie {
  const thumbUrl = joinOphimImage(pathImage, movie?.thumb_url)
  const posterUrl = joinOphimImage(pathImage, movie?.poster_url)
  return {
    id: `ophim:${movie?._id ?? movie?.slug}`,
    source: 'ophim',
    name: text(movie?.name, 'Chưa có tên'),
    originName: text(movie?.origin_name),
    slug: text(movie?.slug),
    thumb: proxyImageUrl(thumbUrl),
    poster: proxyImageUrl(posterUrl),
    year: Number(movie?.year) || undefined,
    time: text(movie?.time),
    episode: text(movie?.episode_current),
    episodeTotal: movie?.episode_total ? String(movie.episode_total).trim() || undefined : undefined,
    quality: text(movie?.quality),
    lang: text(movie?.lang),
    type: text(movie?.type),
    rating: Number(movie?.tmdb?.vote_average || movie?.imdb?.vote_average) || undefined,
    updatedAt: text(movie?.modified?.time || movie?.created),
    categories: toArray(movie?.category).map((item: any) => text(item?.name)).filter(Boolean),
    countries: toArray(movie?.country).map((item: any) => text(item?.name)).filter(Boolean),
  }
}

export function normalizeKkphimMovie(movie: any, pathImage = KKPHIM_IMAGE): NormalizedMovie {
  const thumbUrl = joinKkphimImage(pathImage, movie?.thumb_url)
  const posterUrl = joinKkphimImage(pathImage, movie?.poster_url)
  return {
    id: `kkphim:${movie?._id ?? movie?.slug}`,
    source: 'kkphim',
    name: text(movie?.name, 'Chưa có tên'),
    originName: text(movie?.origin_name),
    slug: text(movie?.slug),
    thumb: proxyImageUrl(thumbUrl),
    poster: proxyImageUrl(posterUrl),
    year: Number(movie?.year) || undefined,
    time: text(movie?.time),
    episode: text(movie?.episode_current),
    episodeTotal: movie?.episode_total != null ? String(movie.episode_total).trim() || undefined : undefined,
    quality: text(movie?.quality),
    lang: text(movie?.lang),
    type: text(movie?.type),
    rating: Number(movie?.tmdb?.vote_average || movie?.imdb?.vote_average) || undefined,
    updatedAt: text(movie?.modified?.time || movie?.created),
    categories: toArray(movie?.category).map((item: any) => text(item?.name)).filter(Boolean),
    countries: toArray(movie?.country).map((item: any) => text(item?.name)).filter(Boolean),
  }
}

function normalizeNguoncMovie(movie: any): NormalizedMovie {
  const image = movie?.thumb_url || movie?.poster_url || movie?.image || movie?.thumbnail
  const thumbUrl = joinImage('', image)
  const posterUrl = joinImage('', movie?.poster_url)

  return {
    id: `nguonc:${movie?._id ?? movie?.slug}`,
    source: 'nguonc',
    name: text(movie?.name || movie?.title, 'Chưa có tên'),
    originName: text(movie?.original_name || movie?.origin_name),
    slug: text(movie?.slug),
    thumb: proxyImageUrl(thumbUrl),
    poster: proxyImageUrl(posterUrl),
    year: Number(movie?.year || movie?.release_year) || undefined,
    time: text(movie?.time || movie?.duration),
    episode: text(movie?.episode_current || movie?.current_episode),
    episodeTotal: (movie?.episode_total || movie?.total_episodes) != null
      ? String(movie.episode_total || movie.total_episodes).trim() || undefined
      : undefined,
    quality: text(movie?.quality),
    lang: text(movie?.language || movie?.lang),
    type: text(movie?.type),
    rating: Number(movie?.rating) || undefined,
    updatedAt: text(movie?.modified || movie?.created),
    categories: toArray(movie?.category || movie?.categories).map((item: any) => text(item?.name ?? item)).filter(Boolean),
    countries: toArray(movie?.country || movie?.countries).map((item: any) => text(item?.name ?? item)).filter(Boolean),
  }
}

async function requestJson<T>(url: string): Promise<T> {
  return await $fetch<T>(url, {
    headers: {
      accept: 'application/json',
      'user-agent': 'CineK/1.0',
    },
    retry: 0,
    timeout: 12000,
  })
}

export async function getOphimKoreanMovies(page: number, keyword = '') {
  const url = keyword
    ? new URL('/v1/api/tim-kiem', OPHIM_BASE)
    : new URL('/v1/api/quoc-gia/han-quoc', OPHIM_BASE)

  url.searchParams.set('page', String(page))
  if (keyword) {
    url.searchParams.set('keyword', keyword)
    url.searchParams.set('country', 'han-quoc')
  }

  const json: any = await requestJson(url.toString())
  const data = json?.data ?? json
  const imageBase = data?.APP_DOMAIN_CDN_IMAGE || data?.pathImage || OPHIM_IMAGE
  const items = toArray(data?.items ?? json?.items)
    .filter(includesKorea)
    .map((item) => normalizeOphimMovie(item, imageBase))
    .filter((movie) => movie.slug)

  return {
    items,
    pagination: data?.params?.pagination ?? data?.pagination ?? json?.pagination ?? {},
  }
}

export async function getNguoncKoreanMovies(page: number, keyword = '') {
  const url = keyword
    ? new URL('/api/films/search', NGUONC_BASE)
    : new URL('/api/films/quoc-gia/han-quoc', NGUONC_BASE)

  if (keyword) {
    url.searchParams.set('keyword', keyword)
  } else {
    url.searchParams.set('page', String(page))
  }

  const json: any = await requestJson(url.toString())
  const data = json?.data ?? json
  const items = toArray(data?.items ?? data?.films ?? json?.items)
    .filter(includesKorea)
    .map(normalizeNguoncMovie)
    .filter((movie) => movie.slug)

  return {
    items,
    pagination: data?.pagination ?? json?.pagination ?? {},
  }
}

export async function getKkphimKoreanMovies(page: number, keyword = '') {
  const url = keyword
    ? new URL('/v1/api/tim-kiem', KKPHIM_BASE)
    : new URL('/v1/api/quoc-gia/han-quoc', KKPHIM_BASE)

  url.searchParams.set('page', String(page))
  if (keyword) {
    url.searchParams.set('keyword', keyword)
    url.searchParams.set('country', 'han-quoc')
  }

  const json: any = await requestJson(url.toString())
  const data = json?.data ?? json
  const imageBase = data?.APP_DOMAIN_CDN_IMAGE || data?.pathImage || KKPHIM_IMAGE
  const items = toArray(data?.items ?? json?.items)
    .filter(includesKorea)
    .map((item) => normalizeKkphimMovie(item, imageBase))
    .filter((movie) => movie.slug)

  return {
    items,
    pagination: data?.params?.pagination ?? data?.pagination ?? json?.pagination ?? {},
  }
}

export async function getKoreanMovies(page: number, keyword = '', source: SourceFilter = 'all') {
  const fetchers = {
    ophim: getOphimKoreanMovies,
    nguonc: getNguoncKoreanMovies,
    kkphim: getKkphimKoreanMovies,
  }
  const selectedSources = isSource(source) ? [source] : SOURCE_NAMES
  const results = await Promise.allSettled(
    selectedSources.map((sourceName) => fetchers[sourceName](page, keyword)),
  )

  const resultGroups = results.map((result) => result.status === 'fulfilled' ? result.value.items : [])
  const items = source === 'all' ? interleaveMovies(resultGroups) : resultGroups.flat()
  const unique = groupMovies(items)

  const pagination = results.find((result) => result.status === 'fulfilled')?.value.pagination ?? {}

  return {
    items: unique,
    page,
    pagination,
    sources: results.map((result, index) => ({
      name: selectedSources[index],
      ok: result.status === 'fulfilled',
    })),
    source,
  }
}

export async function getOphimDetail(slug: string): Promise<MovieDetail> {
  const json: any = await requestJson(`${OPHIM_BASE}/v1/api/phim/${slug}`)
  const data = json?.data ?? json
  const movie = data?.item ?? data?.movie ?? json?.movie ?? json?.item
  const imageBase = data?.APP_DOMAIN_CDN_IMAGE || data?.pathImage || OPHIM_IMAGE
  const normalized = normalizeOphimMovie(movie, imageBase)

  return {
    ...normalized,
    content: stripHtml(movie?.content),
    actors: toArray(movie?.actor).map(normalizeActor).filter(Boolean) as NormalizedActor[],
    directors: toArray(movie?.director).map((item) => text(item)).filter(Boolean),
    trailer: text(movie?.trailer_url),
    servers: toArray(data?.episodes ?? json?.episodes ?? movie?.episodes).map((server: any) => ({
      name: text(server?.server_name, 'Server'),
      source: 'ophim',
      sourceSlug: normalized.slug,
      episodes: toArray(server?.server_data).map((episode: any) => ({
        name: text(episode?.name, 'Tập phim'),
        slug: text(episode?.slug),
        linkEmbed: text(episode?.link_embed),
        linkM3u8: text(episode?.link_m3u8),
      })),
    })),
  }
}

export async function getNguoncDetail(slug: string): Promise<MovieDetail> {
  const json: any = await requestJson(`${NGUONC_BASE}/api/film/${slug}`)
  const movie = json?.movie ?? json?.item ?? json?.data?.item ?? json?.data?.movie ?? json
  const normalized = normalizeNguoncMovie(movie)

  return {
    ...normalized,
    content: stripHtml(movie?.content || movie?.description),
    actors: toArray(movie?.actor || movie?.actors).map(normalizeActor).filter(Boolean) as NormalizedActor[],
    directors: toArray(movie?.director || movie?.directors).map((item: any) => text(item?.name ?? item)).filter(Boolean),
    trailer: text(movie?.trailer_url || movie?.trailer),
    servers: toArray(movie?.episodes ?? json?.episodes ?? json?.data?.episodes).map((server: any) => ({
      name: text(server?.server_name || server?.name, 'Server'),
      source: 'nguonc',
      sourceSlug: normalized.slug,
      episodes: toArray(server?.server_data ?? server?.items ?? server?.episodes).map((episode: any) => ({
        name: text(episode?.name || episode?.title, 'Tập phim'),
        slug: text(episode?.slug),
        linkEmbed: text(episode?.link_embed || episode?.embed),
        linkM3u8: text(episode?.link_m3u8 || episode?.m3u8),
      })),
    })),
  }
}

export async function getKkphimDetail(slug: string): Promise<MovieDetail> {
  const json: any = await requestJson(`${KKPHIM_BASE}/phim/${slug}`)
  const data = json?.data ?? json
  const movie = data?.item ?? data?.movie ?? json?.movie ?? json?.item
  const imageBase = data?.APP_DOMAIN_CDN_IMAGE || data?.pathImage || KKPHIM_IMAGE
  const normalized = normalizeKkphimMovie(movie, imageBase)

  return {
    ...normalized,
    content: stripHtml(movie?.content),
    actors: toArray(movie?.actor).map(normalizeActor).filter(Boolean) as NormalizedActor[],
    directors: toArray(movie?.director).map((item) => text(item)).filter(Boolean),
    trailer: text(movie?.trailer_url),
    servers: toArray(data?.episodes ?? json?.episodes ?? movie?.episodes).map((server: any) => ({
      name: text(server?.server_name, 'Server'),
      source: 'kkphim',
      sourceSlug: normalized.slug,
      episodes: toArray(server?.server_data).map((episode: any) => ({
        name: text(episode?.name, 'Tập phim'),
        slug: text(episode?.slug),
        linkEmbed: text(episode?.link_embed),
        linkM3u8: text(episode?.link_m3u8),
      })),
    })),
  }
}

export function parseSourceRefs(value: unknown, fallbackSource: unknown, fallbackSlug: string): MovieSourceRef[] {
  const refs = typeof value === 'string'
    ? value.split(',').map((item) => {
        const [source, ...slugParts] = item.split(':')
        const slug = slugParts.join(':')
        return isSource(source) && slug ? { source, slug } : undefined
      }).filter(Boolean) as MovieSourceRef[]
    : []

  const uniqueRefs = refs.filter((ref, index, allRefs) =>
    index === allRefs.findIndex((item) => item.source === ref.source && item.slug === ref.slug),
  )

  if (uniqueRefs.length) {
    const preferredSource = isSource(fallbackSource) ? fallbackSource : DEFAULT_SOURCE
    return [
      ...uniqueRefs.filter((ref) => ref.source === preferredSource),
      ...uniqueRefs.filter((ref) => ref.source !== preferredSource),
    ]
  }

  const source = isSource(fallbackSource) ? fallbackSource : DEFAULT_SOURCE
  return [{ source, slug: fallbackSlug }]
}

export async function getMovieDetailGroup(refs: MovieSourceRef[]): Promise<MovieDetail> {
  const detailBySource = {
    ophim: getOphimDetail,
    nguonc: getNguoncDetail,
    kkphim: getKkphimDetail,
  }
  const uniqueRefs = refs.filter((ref, index, allRefs) =>
    index === allRefs.findIndex((item) => item.source === ref.source && item.slug === ref.slug),
  )
  const results = await Promise.allSettled(
    uniqueRefs.map((ref) => detailBySource[ref.source](ref.slug)),
  )
  const details = results
    .map((result) => result.status === 'fulfilled' ? result.value : null)
    .filter(Boolean) as MovieDetail[]

  if (!details.length) {
    const firstRef = uniqueRefs[0]
    return await detailBySource[firstRef.source](firstRef.slug)
  }

  const primary = details[0]
  const sources = details.map(movieSourceRef)
  const servers = details.flatMap((detail) =>
    detail.servers.map((server, sourceServerIndex) => ({
      ...server,
      name: `${detail.source.toUpperCase()} - ${server.name}`,
      source: detail.source,
      sourceSlug: detail.slug,
      sourceServerIndex,
    })),
  )

  return {
    ...primary,
    sources,
    servers,
    actors: details.find((detail) => detail.actors.length)?.actors || primary.actors,
    directors: details.find((detail) => detail.directors.length)?.directors || primary.directors,
    content: details.find((detail) => detail.content && detail.content.length > primary.content.length)?.content || primary.content,
  }
}