import type { FilesEntityFromCandidateResult, FilesExternalCandidate } from "@umt/contracts";
import type { Principal } from "../../http/auth.ts";
import { CandidateError, createEntityFromTmdbCandidate } from "../sources-identity/service/entity-from-candidate.ts";
import { actorOfP, FilesError, type FmDeps } from "./common.ts";
import { audit } from "./ledger.ts";

// G1:整理向导选中"仅 TMDB 候选"作品 → 就地建本地作品 + 外部映射(accepted/manual)+ 季集单元,返回 entityId。
// 幂等(同 TMDB id 已有映射即复用);/files/organize 的 external 项与独立端点共用。

const actorOf = (p: Principal | undefined) => ({
  type: p?.kind === "api_key" ? ("api_key" as const) : ("user" as const),
  id: actorOfP(p),
});

export async function entityFromCandidate(
  d: FmDeps,
  principal: Principal | undefined,
  ref: FilesExternalCandidate,
): Promise<FilesEntityFromCandidateResult> {
  try {
    const r = await createEntityFromTmdbCandidate(d.ctx.db, d.tmdb, ref, actorOf(principal));
    if (r.created) await audit(d, principal, "entity_from_candidate", { ...ref, mediaEntityId: r.mediaEntityId });
    return r;
  } catch (e) {
    if (e instanceof CandidateError)
      throw new FilesError(
        e.reason === "not_found" ? "not_found" : e.reason === "upstream" ? "upstream" : "bad_request",
        e.message,
      );
    throw e;
  }
}

export const externalKey = (x: FilesExternalCandidate) => `${x.provider}:${x.kind}:${x.externalId}`;