// Breadcrumb helper unit test — the parent-nav-crumb rule that decides whether
// the responsible sidebar entry is prefixed to the loader-derived trail.

import { describe, expect, it } from "vitest";
import { shouldShowParentNavCrumb, type BreadcrumbTrailEntry } from "./useTitleData";

const CONTACTS_TRAIL: BreadcrumbTrailEntry[] = [
  { label: "Kontakte", href: "/app/acme/contacts" },
  { label: "Tags", href: "/app/acme/contacts/admin/tags" },
];

describe("shouldShowParentNavCrumb", () => {
  it("drops a nav crumb whose target the trail already points at under a different name", () => {
    // The CRM sidebar entry links to the contact list; the trail names that very
    // page "Kontakte". A "CRM" crumb would be a second crumb for one route.
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/contacts",
        navTitle: "CRM",
        currentPathname: "/app/acme/contacts/admin/tags",
        currentCrumbLabel: "Tags",
        trail: CONTACTS_TRAIL,
      }),
    ).toBe(false);
  });

  it("ignores a trailing slash when comparing the nav target with the trail", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/contacts/",
        navTitle: "CRM",
        currentPathname: "/app/acme/contacts/admin/tags",
        currentCrumbLabel: "Tags",
        trail: CONTACTS_TRAIL,
      }),
    ).toBe(false);
  });

  it("drops a nav crumb that the trail already carries under the same label", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/other",
        navTitle: "Kontakte",
        currentPathname: "/app/acme/contacts/admin/tags",
        currentCrumbLabel: "Tags",
        trail: CONTACTS_TRAIL,
      }),
    ).toBe(false);
  });

  it("drops the nav crumb when it is the current page", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/contacts",
        navTitle: "CRM",
        currentPathname: "/app/acme/contacts/",
        currentCrumbLabel: "Kontakte",
        trail: [{ label: "Kontakte", href: "/app/acme/contacts" }],
      }),
    ).toBe(false);
  });

  it("keeps a nav crumb that names a section the trail does not cover", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/bookings/pages",
        navTitle: "Buchungsseiten",
        currentPathname: "/app/acme/bookings/pages/p1/edit",
        currentCrumbLabel: "Editor",
        trail: [{ label: "Editor", href: "/app/acme/bookings/pages/p1/edit" }],
      }),
    ).toBe(true);
  });

  it("drops the nav crumb when the current page has its own row in the inner sub-sidenav", () => {
    // /leads-statistics is a sibling entry under the Leads area. The rail
    // already shows that context, so a "Leads" crumb would invent a level.
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/leads",
        navTitle: "Leads",
        currentPathname: "/app/acme/leads-statistics",
        currentCrumbLabel: "Lead-Statistiken",
        trail: [{ label: "Lead-Statistiken", href: "/app/acme/leads-statistics" }],
        navContextPaths: ["/app/acme/leads", "/app/acme/leads-statistics"],
      }),
    ).toBe(false);
  });

  it("keeps the nav crumb for a sub-page that has no row of its own in the rail", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/leads",
        navTitle: "Leads",
        currentPathname: "/app/acme/leads/l1",
        currentCrumbLabel: "Karin Lehmann",
        trail: [{ label: "Karin Lehmann", href: "/app/acme/leads/l1" }],
        navContextPaths: ["/app/acme/leads", "/app/acme/leads-statistics"],
      }),
    ).toBe(true);
  });

  it("drops the nav crumb when the trail already links to a row of the inner sub-sidenav", () => {
    // Booking detail below the "Buchungen" row of the Termine rail: the trail
    // names that row itself, so the area crumb would add a third level for a
    // path the user walked in two steps.
    expect(
      shouldShowParentNavCrumb({
        navPath: "/app/acme/calendar",
        navTitle: "Termine",
        currentPathname: "/app/acme/bookings/b1",
        currentCrumbLabel: "Buchung",
        trail: [
          { label: "Buchungen", href: "/app/acme/bookings" },
          { label: "Buchung", href: "/app/acme/bookings/b1" },
        ],
        navContextPaths: ["/app/acme/calendar", "/app/acme/bookings", "/app/acme/availability"],
      }),
    ).toBe(false);
  });

  it("drops the nav crumb when the entry has no path to link to", () => {
    expect(
      shouldShowParentNavCrumb({
        navPath: "",
        navTitle: "CRM",
        currentPathname: "/app/acme/contacts/admin/tags",
        currentCrumbLabel: "Tags",
        trail: CONTACTS_TRAIL,
      }),
    ).toBe(false);
  });
});