// ---------------------------------------------------------------------------
// Document kinds shared by the library sidebar: the three first-class entities
// (tileset, map, world), the atproto collection (NSID) each lives in, and the
// `$type` discriminator that tags a repo record.
//
// A record's top-level `$type` equals its entity's collection NSID, so
// `kindFromType` can resolve a kind from the tag alone.
// ---------------------------------------------------------------------------

import { TILESET_NSID } from '@/lexicon/tileset'

export type DocKind = 'tileset' | 'map' | 'world'

/** Collection NSIDs. Tilesets have a published lexicon; map/world records reuse
 *  the same naming and the local document shapes until their lexicons land. */
export const MAP_NSID = 'world.tilemap.map'
export const WORLD_NSID = 'world.tilemap.world'
export { TILESET_NSID }

export const COLLECTION_BY_KIND: Record<DocKind, string> = {
  tileset: TILESET_NSID,
  map: MAP_NSID,
  world: WORLD_NSID,
}

/** Human label for a kind (singular). */
export const KIND_LABEL: Record<DocKind, string> = {
  tileset: 'Tileset',
  map: 'Map',
  world: 'World',
}

/** Map a record/file `$type` (or a `#fragment` on a collection) to its kind. */
export function kindFromType(type: unknown): DocKind | null {
  if (typeof type !== 'string') return null
  const nsid = type.split('#')[0]
  for (const kind of Object.keys(COLLECTION_BY_KIND) as DocKind[]) {
    if (COLLECTION_BY_KIND[kind] === nsid) return kind
  }
  return null
}