import { describe, expect, test } from "vitest";
import { act, renderHook, waitFor } from "@testing-library/react";
import { type ReactNode, useState } from "react";
import { MemoryRouter } from "react-router";
import { AuthContext } from "../../../contexts/auth/AuthContext.ts";
import { useUserDumpFeed } from "../../../hooks/dump/useUserDumpFeed.ts";
import { calls, fail, route } from "../../fetch.ts";
import { makeDump, makeSession, makeUser, page, wire } from "../../fixtures.ts";
import { FakeIntersectionObserver } from "../../setup.ts";
import type { Session } from "../../../utils/auth/storage.ts";

describe("useUserDumpFeed", () => {
  const ann = makeUser({ username: "ann" });
  function setup(
    opts: { session?: ReturnType<typeof makeSession> | null } = {},
  ) {
    const session = opts.session ?? null;
    function Wrapper({ children }: { children: ReactNode }) {
      const [authResponse, setAuthResponse] = useState<Session | null>(session);
      return (
        <MemoryRouter>
          <AuthContext.Provider value={{ authResponse, setAuthResponse }}>
            {children}
          </AuthContext.Provider>
        </MemoryRouter>
      );
    }
    return renderHook(
      ({ username }: { username?: string }) =>
        useUserDumpFeed(username, "dumps", "cache-key"),
      {
        initialProps: { username: "ann" as string | undefined },
        wrapper: Wrapper,
      },
    );
  }

  test("loads the profile and the first page", async () => {
    route("GET /api/users/:u", () => wire(ann));
    route("GET /api/users/:u/dumps", () => page([makeDump({ id: "a" })], true));
    const session = makeSession();
    const { result } = setup({ session });
    await waitFor(() => expect(result.current.state.status).toBe("loaded"));
    const s = result.current.state as Extract<
      typeof result.current.state,
      { status: "loaded" }
    >;
    expect(s.profileUser.username).toBe("ann");
    expect(s.items[0].createdAt).toBeInstanceOf(Date);
    expect(s.hasMore).toBe(true);
    const [req] = calls("GET /api/users/:u/dumps");
    expect(req.url.searchParams.get("page")).toBe("1");
    expect(req.headers.get("Authorization")).toBe(`Bearer ${session.token}`);
  });

  test("an unknown user is an error", async () => {
    route("GET /api/users/:u", () => fail("User not found", 404));
    route("GET /api/users/:u/dumps", () => page([]));
    const { result } = setup();
    await waitFor(() => expect(result.current.state.status).toBe("error"));
  });

  test("an offline load says so", async () => {
    route("GET /api/users/:u", () => new TypeError("Failed to fetch"));
    route("GET /api/users/:u/dumps", () => page([]));
    const { result } = setup();
    await waitFor(() =>
      expect(result.current.state).toMatchObject({
        status: "error",
        error: expect.stringMatching(/Could not connect/),
      })
    );
  });

  test("scrolling to the sentinel loads the next page", async () => {
    route("GET /api/users/:u", () => wire(ann));
    route(
      "GET /api/users/:u/dumps",
      (req) =>
        req.url.searchParams.get("page") === "1"
          ? page([makeDump({ id: "a" })], true)
          : page([makeDump({ id: "b" })], false),
    );
    const { result } = setup();
    await waitFor(() => expect(result.current.state.status).toBe("loaded"));
    const sentinel = document.createElement("div");
    act(() => {
      result.current.sentinelRef(sentinel);
    });
    const obs = FakeIntersectionObserver.instances.at(-1)!;
    act(() => obs.report(true));
    await waitFor(() => {
      const s = result.current.state;
      expect(s.status === "loaded" && s.items.map((d) => d.id)).toEqual([
        "a",
        "b",
      ]);
    });
    const s = result.current.state as Extract<
      typeof result.current.state,
      { status: "loaded" }
    >;
    expect(s.hasMore).toBe(false);
    expect(s.page).toBe(2);
  });

  test("changing user resets to loading", async () => {
    route(
      "GET /api/users/:u",
      (req) => wire(makeUser({ username: req.params.u })),
    );
    route("GET /api/users/:u/dumps", () => page([]));
    const { result, rerender } = setup();
    await waitFor(() => expect(result.current.state.status).toBe("loaded"));
    rerender({ username: "bob" });
    expect(result.current.state.status).toBe("loading");
    await waitFor(() => expect(result.current.state.status).toBe("loaded"));
  });

  test("setItems edits the loaded list", async () => {
    route("GET /api/users/:u", () => wire(ann));
    route(
      "GET /api/users/:u/dumps",
      () => page([makeDump({ id: "a" }), makeDump({ id: "b" })]),
    );
    const { result } = setup();
    await waitFor(() => expect(result.current.state.status).toBe("loaded"));
    act(() => result.current.setItems((prev) => prev.slice(1)));
    const s = result.current.state as Extract<
      typeof result.current.state,
      { status: "loaded" }
    >;
    expect(s.items.map((d) => d.id)).toEqual(["b"]);
  });
});