import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
import { createMemoryRouter, MemoryRouter, RouterProvider, useLocation } from "react-router-dom";
import { describe, expect, it } from "vitest";
import {
  type MemoFilter,
  MemoFilterProvider,
  parseFilterQuery,
  stringifyFilters,
  useMemoFilterContext,
} from "@/contexts/MemoFilterContext";
import { BUILTIN_TASKS_VIEW_ID } from "@/lib/memo-views";

const expression = 'tags.exists(t, t.contains("50%, café & C++"))\n || space == null';

const Harness = () => {
  const { filters, setFilters, setMemoView, memoView } = useMemoFilterContext();
  const location = useLocation();
  return (
    <div>
      <output data-testid="filters">{JSON.stringify(filters)}</output>
      <output data-testid="memoView">{memoView}</output>
      <output data-testid="url">{location.search}</output>
      <button type="button" onClick={() => setFilters([{ factor: "celSearch", value: expression }])}>
        Search CEL
      </button>
      <button type="button" onClick={() => setFilters([{ factor: "contentSearch", value: "plan" }])}>
        Search plan
      </button>
      <button type="button" onClick={() => setMemoView(BUILTIN_TASKS_VIEW_ID)}>
        Select Tasks
      </button>
    </div>
  );
};

describe("MemoFilterProvider", () => {
  it("restores CEL after URL synchronization, navigation history, and remount", async () => {
    const routes = [
      {
        path: "*",
        element: (
          <MemoFilterProvider>
            <Harness />
          </MemoFilterProvider>
        ),
      },
    ];
    const router = createMemoryRouter(routes, { initialEntries: ["/inbox", "/explore"], initialIndex: 1 });
    const rendered = render(<RouterProvider router={router} />);
    fireEvent.click(screen.getByRole("button", { name: "Search CEL" }));
    const expected: MemoFilter[] = [{ factor: "celSearch", value: expression }];
    await waitFor(() => expect(parseFilterQuery(new URLSearchParams(router.state.location.search).get("filter"))).toEqual(expected));
    const savedUrl = `/explore${router.state.location.search}`;
    await act(async () => {
      await router.navigate(-1);
    });
    await waitFor(() => expect(screen.getByTestId("filters")).toHaveTextContent("[]"));
    await act(async () => {
      await router.navigate(1);
    });
    await waitFor(() => expect(screen.getByTestId("filters")).toHaveTextContent(JSON.stringify(expected)));
    rendered.unmount();
    render(<RouterProvider router={createMemoryRouter(routes, { initialEntries: [savedUrl] })} />);
    expect(screen.getByTestId("filters")).toHaveTextContent(JSON.stringify(expected));
    expect(new URLSearchParams(router.state.location.search).get("filter")).toBe(stringifyFilters(expected));
  });
  it("keeps encoded values containing colons intact", () => {
    expect(parseFilterQuery("contentSearch:https://example.com:8080/path")).toEqual([
      { factor: "contentSearch", value: "https://example.com:8080/path" },
    ]);
  });

  it("keeps search filters when selecting a view", () => {
    render(
      <MemoryRouter>
        <MemoFilterProvider>
          <Harness />
        </MemoFilterProvider>
      </MemoryRouter>,
    );

    fireEvent.click(screen.getByRole("button", { name: "Search plan" }));
    fireEvent.click(screen.getByRole("button", { name: "Select Tasks" }));

    expect(screen.getByTestId("filters")).toHaveTextContent('[{"factor":"contentSearch","value":"plan"}]');
    expect(screen.getByTestId("memoView")).toHaveTextContent(BUILTIN_TASKS_VIEW_ID);
  });
});