import { describe, expect, it } from "vitest";
import { buildFolderTree, flattenVisible } from "./folderTree";

describe("buildFolderTree (Akzeptanzkriterium 1: Ordnerbaum aus den Postfächern des Mandanten)", () => {
  it("baut flache Ordner als Baumwurzeln ohne Verschachtelung", () => {
    const tree = buildFolderTree([
      { name: "posteingang", messageCount: 3 },
      { name: "archiv", messageCount: 1 },
    ]);
    expect(tree.map((n) => n.name)).toEqual(["posteingang", "archiv"]);
    expect(tree.every((n) => n.children.length === 0)).toBe(true);
  });

  it("gruppiert '/'-getrennte Namen zu einer Hierarchie", () => {
    const tree = buildFolderTree([
      { name: "INBOX/Projekte/Alpha", messageCount: 2 },
      { name: "INBOX/Projekte/Beta", messageCount: 5 },
    ]);
    expect(tree).toHaveLength(1);
    expect(tree[0].name).toBe("INBOX");
    expect(tree[0].messageCount).toBeNull();
    const projekte = tree[0].children[0];
    expect(projekte.name).toBe("INBOX/Projekte");
    expect(projekte.children.map((c) => c.name)).toEqual(["INBOX/Projekte/Alpha", "INBOX/Projekte/Beta"]);
  });

  it("flattenVisible zeigt eingeklappte Kinder nicht", () => {
    const tree = buildFolderTree([{ name: "INBOX/Projekte", messageCount: 1 }]);
    expect(flattenVisible(tree, new Set())).toHaveLength(1);
    expect(flattenVisible(tree, new Set(["INBOX"]))).toHaveLength(2);
  });
});