import { getTmdbImageUrl } from '../api/tmdb'
import type { BaseItemDto } from '../api/types'
import type { TmdbDiscoverItem } from '../api/tmdb'

/**
 * Convert a TMDB result row (movie / tv / multi) into a synthetic
 * BaseItemDto so it can render through the same PosterCard pipeline as
 * Jellyfin items. When a `libraryMap` (TMDB id -> Jellyfin item) is
 * provided, items already in the user's library are flagged via
 * `_inLibrary` and their `Id` is rewritten to the local Jellyfin id so
 * clicking opens the existing detail page instead of the synthetic one.
 */
export function mapTmdbToJf(
  items: TmdbDiscoverItem[],
  libraryMap?: Map<string, { id: string; name: string; type: string }>,
): BaseItemDto[] {
  return items.map(m => {
    const local = libraryMap?.get(String(m.id))
    const isSeries = m.media_type === 'tv' || !!m.first_air_date
    // Encode kind in the synthetic id so DetailPage can route directly
    // to the right TMDB endpoint without guessing. Library matches keep
    // the Jellyfin id as before.
    const syntheticId = `tmdb-${isSeries ? 'tv' : 'movie'}-${m.id}`
    return {
      Id: local?.id || syntheticId,
      Name: m.title || m.name,
      Type: isSeries ? 'Series' : 'Movie',
      ProductionYear: m.release_date
        ? parseInt(m.release_date)
        : m.first_air_date
          ? parseInt(m.first_air_date)
          : undefined,
      Overview: m.overview,
      ImageTags: {},
      ProviderIds: { Tmdb: String(m.id) },
      CommunityRating: typeof m.vote_average === 'number' ? m.vote_average : undefined,
      _tmdbPoster: m.poster_path ? getTmdbImageUrl(m.poster_path, 'w342') : undefined,
      _tmdbBackdrop: m.backdrop_path ? getTmdbImageUrl(m.backdrop_path, 'w780') : undefined,
      _inLibrary: !!local,
      _tmdbId: String(m.id),
    } as unknown as BaseItemDto
  })
}

/**
 * Detect whether a route id is a synthetic TMDB id (from the discovery
 * rows) and parse out kind + numeric id when so. Returns null for
 * regular Jellyfin ids.
 */
export function parseTmdbRouteId(id: string | undefined | null): { kind: 'movie' | 'tv'; tmdbId: number } | null {
  if (!id) return null
  // New format: tmdb-movie-123 / tmdb-tv-123
  const match = id.match(/^tmdb-(movie|tv)-(\d+)$/)
  if (match) {
    return { kind: match[1] as 'movie' | 'tv', tmdbId: Number(match[2]) }
  }
  // Legacy format: tmdb-123 (kind unknown - default to movie). Persists
  // until any saved data with the old id refreshes.
  const legacy = id.match(/^tmdb-(\d+)$/)
  if (legacy) return { kind: 'movie', tmdbId: Number(legacy[1]) }
  return null
}