import { expect, it } from "vitest";
import { groupByDir } from "../src/lib/group";
import type { Book } from "../src/api/types";

let seq = 1;
const mk = (path: string): Book => ({
  id: seq++, library_id: 1, path, title: path, format: "cbz", size: 1, mtime: 1, pages: 0,
  state: "ready", error: "", added_at: "", percent: 0, cover_url: "/api/books/0/cover",
});

it("根目录组为空串且排最前;目录组按字典序;组内保持输入顺序", () => {
  const gs = groupByDir([mk("b.cbz"), mk("z/1.cbz"), mk("a/2.cbz"), mk("a/sub/3.cbz")]);
  expect(gs.map((g) => g.dir)).toEqual(["", "a", "a/sub", "z"]);
  expect(gs[0].books.map((x) => x.path)).toEqual(["b.cbz"]);
  expect(gs[1].books.map((x) => x.path)).toEqual(["a/2.cbz"]);
});

it("空输入出空数组", () => {
  expect(groupByDir([])).toEqual([]);
});