import type {
  ExplainTrack,
  MuseumExhibit,
  MuseumHall,
  SearchIndexItem
} from '@/domain/museum'
import {
  mediaRepository,
  type MediaRepository
} from '@/repositories/MediaRepository'
import {
  museumContentRepository,
  type MuseumContentRepository
} from '@/repositories/MuseumContentRepository'

export interface ExplainRepository {
  listExhibits(): Promise<MuseumExhibit[]>
  getExhibitById(id: string): Promise<MuseumExhibit | null>
  listHalls(): Promise<MuseumHall[]>
  getHallById(id: string): Promise<MuseumHall | null>
  listTracks(): Promise<ExplainTrack[]>
  getTrackByExhibitId(exhibitId: string): Promise<ExplainTrack | null>
  searchExplain(keyword?: string): Promise<SearchIndexItem[]>
}

const trackTitleFor = (exhibit: MuseumExhibit) => `${exhibit.name}讲解`

export class DefaultExplainRepository implements ExplainRepository {
  constructor(
    private readonly content: MuseumContentRepository = museumContentRepository,
    private readonly media: MediaRepository = mediaRepository
  ) {}

  listExhibits() {
    return this.content.listExhibits()
  }

  getExhibitById(id: string) {
    return this.content.getExhibitById(id)
  }

  listHalls() {
    return this.content.listHalls()
  }

  getHallById(id: string) {
    return this.content.getHallById(id)
  }

  async listTracks() {
    const exhibits = await this.content.listExhibits()

    return Promise.all(exhibits.map(async (exhibit): Promise<ExplainTrack> => {
      const media = await this.media.getMediaForExplainTrack(exhibit.id)
      return {
        id: `track-${exhibit.id}`,
        exhibitId: exhibit.id,
        hallId: exhibit.hallId,
        title: trackTitleFor(exhibit),
        summary: exhibit.description,
        mediaId: media?.id,
        coverImage: exhibit.image,
        poiId: exhibit.poiId,
        floorId: exhibit.floorId,
        available: media?.available === true
      }
    }))
  }

  async getTrackByExhibitId(exhibitId: string) {
    const tracks = await this.listTracks()
    return tracks.find((track) => track.exhibitId === exhibitId) || null
  }

  async searchExplain(keyword = '') {
    const normalizedKeyword = keyword.trim().toLowerCase()
    const [exhibits, halls] = await Promise.all([
      this.content.listExhibits(),
      this.content.listHalls()
    ])

    const exhibitItems = exhibits
      .filter((exhibit) => !normalizedKeyword || [
        exhibit.name,
        exhibit.hallName,
        exhibit.floorLabel,
        ...(exhibit.tags || [])
      ].filter(Boolean).join(' ').toLowerCase().includes(normalizedKeyword))
      .map<SearchIndexItem>((exhibit) => ({
        id: exhibit.id,
        name: exhibit.name,
        desc: `${exhibit.hallName || '展品讲解'} · ${exhibit.floorLabel || ''}`.trim(),
        type: 'exhibit',
        exhibitId: exhibit.id,
        hallId: exhibit.hallId,
        poiId: exhibit.poiId,
        floorId: exhibit.floorId
      }))

    const hallItems = halls
      .filter((hall) => !normalizedKeyword || [
        hall.name,
        hall.floorLabel,
        hall.description
      ].filter(Boolean).join(' ').toLowerCase().includes(normalizedKeyword))
      .map<SearchIndexItem>((hall) => ({
        id: hall.id,
        name: hall.name,
        desc: `${hall.floorLabel || ''} · ${hall.exhibitCount || 0}个讲解内容`.trim(),
        type: 'hall',
        hallId: hall.id,
        poiId: hall.poiId,
        floorId: hall.floorId
      }))

    return [...exhibitItems, ...hallItems]
  }
}

export const explainRepository = new DefaultExplainRepository()