import type {
  MuseumExhibit,
  MuseumHall,
  SearchIndexItem
} from '@/domain/museum'

export type ExplainContentType = 'hall' | 'zone' | 'exhibit' | 'theme'
export type ExplainAudioStatus = 'playable' | 'unavailable' | 'none'

export interface ExplainCardViewModel {
  id: string
  title: string
  subtitle?: string
  summary?: string
  coverImage?: string
  contentType: ExplainContentType
  hallName?: string
  floorLabel?: string
  durationLabel?: string
  languageLabel?: string
  audioStatus: ExplainAudioStatus
  audioStatusText: string
  badges: string[]
  progress?: number
  poiId?: string
  locationActionText?: string
}

export interface ExplainDetailPageViewModel {
  id: string
  title: string
  subtitle?: string
  contentType: ExplainContentType
  coverImages: string[]
  hallName?: string
  floorLabel?: string
  summary: string
  body: string
  audio: {
    status: ExplainAudioStatus
    url?: string
    durationLabel?: string
    language?: string
    unavailableReason?: string
  }
  chapters: Array<{
    id: string
    title: string
    startTime?: number
  }>
  transcript?: string
  location?: {
    poiId: string
    actionText: string
    previewOnly: boolean
  }
  relatedItems: ExplainCardViewModel[]
}

export type ExplainExhibitViewModel = ExplainCardViewModel
export type ExplainDetailViewModel = ExplainDetailPageViewModel

export interface HallDetailViewModel {
  id: string
  name: string
  floorLabel: string
  description: string
  image: string
  exhibitCount: number
  area?: string
  poiId?: string
}

const contentTypeFor = (exhibit: MuseumExhibit): ExplainContentType => {
  if (exhibit.tags?.some((tag) => /主题/.test(tag))) return 'theme'
  if (exhibit.hallName && exhibit.tags?.some((tag) => /展厅/.test(tag))) return 'hall'
  return 'exhibit'
}

const buildSubtitle = (exhibit: MuseumExhibit) => [
  exhibit.hallName,
  exhibit.floorLabel
].filter(Boolean).join(' · ')

const buildBadges = (exhibit: MuseumExhibit) => {
  const badges = [
    exhibit.hallName ? '展厅讲解' : '讲解点',
    exhibit.floorLabel || '',
    ...(exhibit.tags || [])
  ].filter(Boolean)

  return Array.from(new Set(badges)).slice(0, 3)
}

export const toExplainCardViewModel = (exhibit: MuseumExhibit): ExplainCardViewModel => ({
  id: exhibit.id,
  title: exhibit.name,
  subtitle: buildSubtitle(exhibit),
  summary: exhibit.description || '讲解内容待正式内容库补充。',
  coverImage: exhibit.image,
  contentType: contentTypeFor(exhibit),
  hallName: exhibit.hallName,
  floorLabel: exhibit.floorLabel,
  durationLabel: undefined,
  languageLabel: undefined,
  audioStatus: 'unavailable',
  audioStatusText: '图文讲解',
  badges: buildBadges(exhibit),
  progress: undefined,
  poiId: exhibit.poiId,
  locationActionText: '查看位置'
})

export const toExplainExhibitViewModel = (exhibit: MuseumExhibit): ExplainExhibitViewModel => toExplainCardViewModel(exhibit)

export const toExplainDetailPageViewModel = (exhibit: MuseumExhibit): ExplainDetailPageViewModel => ({
  id: exhibit.id,
  title: exhibit.name,
  subtitle: buildSubtitle(exhibit),
  contentType: contentTypeFor(exhibit),
  coverImages: [exhibit.image || '/static/exhibit-placeholder.jpg'].filter(Boolean),
  hallName: exhibit.hallName,
  floorLabel: exhibit.floorLabel,
  summary: exhibit.description || '该讲解内容待正式内容库补充。',
  body: exhibit.description || '该讲解内容待正式内容库补充。',
  audio: {
    status: 'unavailable',
    unavailableReason: '正式讲解音频尚未接入媒体仓储'
  },
  chapters: [],
  transcript: undefined,
  location: exhibit.poiId
    ? {
      poiId: exhibit.poiId,
      actionText: '查看三维位置',
      previewOnly: true
    }
    : undefined,
  relatedItems: []
})

export const toExplainDetailViewModel = (exhibit: MuseumExhibit): ExplainDetailViewModel => toExplainDetailPageViewModel(exhibit)

export const toHallDetailViewModel = (hall: MuseumHall): HallDetailViewModel => ({
  id: hall.id,
  name: hall.name,
  floorLabel: hall.floorLabel || '楼层待补充',
  description: hall.description || '该展厅介绍待正式内容库补充。',
  image: hall.image || '/static/hall-placeholder.jpg',
  exhibitCount: hall.exhibitCount || 0,
  area: hall.area,
  poiId: hall.poiId
})

export const toExplainSearchResultViewModel = (item: SearchIndexItem) => ({
  id: item.id,
  name: item.name,
  desc: item.desc,
  type: item.type
})