import { test } from "node:test";
import assert from "node:assert/strict";
import { toDisplaySummary } from "./transcripts-server";
import type { TranscriptSummary } from "./transcripts";

// Run with: node_modules/.bin/tsx --test common/lib/transcripts-server.test.ts

function summary(over: Partial<TranscriptSummary> = {}): TranscriptSummary {
  return {
    slug: "test-channel/v1",
    id: "v1",
    channelSlug: "test-channel",
    title: "A stream",
    uploadDate: "20260101",
    duration: 3600,
    channel: "Test Channel",
    description: "",
    tags: ["keyword-one", "keyword-two"],
    isLivestream: false,
    ageRestricted: false,
    platform: "youtube",
    webpageUrl: "https://example.com/v1",
    ...over,
  };
}

test("toDisplaySummary omits curatedTags entirely when there are none", () => {
  // The byte-identical-pages contract: an untagged corpus's summaries pages
  // must not gain a key, or every one of them is rewritten on upgrade.
  const display = toDisplaySummary(summary());
  assert.equal("curatedTags" in display, false);
  assert.equal("curatedTags" in toDisplaySummary(summary({ curatedTags: [] })), false);
  // And the platform's keywords do NOT leak in under the new name.
  assert.equal(JSON.stringify(display).includes("keyword-one"), false);
});

test("toDisplaySummary passes curatedTags through in order", () => {
  const display = toDisplaySummary(
    summary({ curatedTags: ["eva-collab", "eva-topic"] }),
  );
  assert.deepEqual(display.curatedTags, ["eva-collab", "eva-topic"]);
});

test("toDisplaySummary still derives the state fields it always did", () => {
  const available = toDisplaySummary(summary());
  assert.equal(available.isDeleted, false);
  assert.equal(available.isUnlisted, false);
  assert.equal("state" in available, false);
  const deleted = toDisplaySummary(summary({ curatedTags: ["x"] }), {
    state: "deleted",
  });
  assert.equal(deleted.state, "deleted");
  assert.equal(deleted.isDeleted, true);
  assert.deepEqual(deleted.curatedTags, ["x"]);
});