import { describe, expect, test } from "bun:test";
import {
  createNavigationCoordinator,
  internalDocRoute,
  resolveDocLink,
} from "../site/navigation.js";

const routeFor = (path) =>
  path.replace(/^\/+|\/+$/g, "").replace(/\.md$/i, "").replace(/(^|\/)README$/i, "$1").replace(/\/$/, "");

describe("document navigation", () => {
  test("resolves a README sibling to its canonical route", () => {
    expect(resolveDocLink("./cost-declaration.md", "operations/home-infra/README.md")).toBe(
      "operations/home-infra/cost-declaration.md",
    );
    expect(
      internalDocRoute(
        "./cost-declaration.md",
        "operations/home-infra/README.md",
        routeFor,
      ),
    ).toBe("operations/home-infra/cost-declaration");
  });

  test("leaves external, in-page, and asset links alone", () => {
    for (const href of ["https://example.com", "mailto:a@example.com", "#heading", "./plot.png"]) {
      expect(internalDocRoute(href, "operations/home-infra/README.md", routeFor)).toBeNull();
    }
  });

  test("invalidates and aborts an older navigation", () => {
    const coordinator = createNavigationCoordinator();
    const first = coordinator.begin();
    const second = coordinator.begin();

    expect(first.signal.aborted).toBe(true);
    expect(first.isCurrent()).toBe(false);
    expect(second.signal.aborted).toBe(false);
    expect(second.isCurrent()).toBe(true);
  });
});