import { describe, it, expect } from "vitest";
import { prisma } from "@/lib/db";
import { GET } from "./route";

async function li(artist: string, album: string, rgMbid: string | null, path = "/m") {
  return prisma.libraryItem.create({
    data: { artist, album, path, source: "scan", format: "FLAC", qualityClass: 2, rgMbid },
  });
}

describe("library duplicates API", () => {
  it("groups items sharing a release-group", async () => {
    await li("Adele", "21", "rg-21");
    await li("Adele", "21 (Deluxe)", "rg-21"); // same rg → duplicate
    await li("Adele", "25", "rg-25"); // unrelated
    const { duplicates } = await (await GET()).json();
    expect(duplicates).toHaveLength(1);
    expect(duplicates[0].map((d: { album: string }) => d.album).sort()).toEqual(["21", "21 (Deluxe)"]);
  });

  it("groups items with the same edition-normalized title even without a shared rgMbid", async () => {
    await li("Nirvana", "Nevermind", null);
    await li("Nirvana", "Nevermind (Deluxe Edition)", "rg-x");
    const { duplicates } = await (await GET()).json();
    expect(duplicates).toHaveLength(1);
    expect(duplicates[0]).toHaveLength(2);
  });

  it("returns nothing when there are no duplicates", async () => {
    await li("A", "One", "rg-1");
    await li("B", "Two", "rg-2");
    const { duplicates } = await (await GET()).json();
    expect(duplicates).toEqual([]);
  });
});