import { describe, it, expect, beforeEach } from "vitest";
import { PettyPagination } from "../src/components/pagination/index";
import { h } from "./helpers";

describe("petty-pagination", () => {
  let el: PettyPagination;

  beforeEach(() => {
    document.body.textContent = "";
    el = document.createElement("petty-pagination") as PettyPagination;
    el.setAttribute("total", "50");
    el.setAttribute("page-size", "10");
    el.appendChild(h("petty-pagination-item", { type: "prev" }, "Prev"));
    el.appendChild(h("petty-pagination-item", { value: "1" }, "1"));
    el.appendChild(h("petty-pagination-item", { value: "2" }, "2"));
    el.appendChild(h("petty-pagination-item", { value: "3" }, "3"));
    el.appendChild(h("petty-pagination-item", { type: "next" }, "Next"));
    document.body.appendChild(el);
  });

  it("registers and calculates totalPages", () => {
    expect(customElements.get("petty-pagination")).toBe(PettyPagination);
    expect(el.totalPages).toBe(5);
    expect(el.currentPage).toBe(1);
  });

  it("marks page 1 as active with aria-current", () => {
    const item1 = el.querySelector("[value='1']")!;
    expect(item1.getAttribute("data-state")).toBe("active");
    expect(item1.getAttribute("aria-current")).toBe("page");
  });

  it("disables prev on first page", () => {
    expect(el.querySelector("[type=prev]")!.hasAttribute("disabled")).toBe(true);
  });

  it("clamps goToPage to valid range", () => {
    el.goToPage(0);
    expect(el.currentPage).toBe(1);
    el.goToPage(999);
    expect(el.currentPage).toBe(5);
  });

  it("fires petty-change on goToPage", () => {
    let detail: { page: number } | null = null;
    el.addEventListener("petty-change", ((e: CustomEvent) => { detail = e.detail; }) as EventListener);
    el.goToPage(3);
    expect(detail).toEqual({ page: 3 });
    expect(el.currentPage).toBe(3);
  });

  it("disables next on last page", () => {
    el.goToPage(5);
    expect(el.querySelector("[type=next]")!.hasAttribute("disabled")).toBe(true);
  });
});