import { fireEvent, render, screen, waitFor } from "@testing-library/react";
import { beforeEach, describe, expect, it, vi } from "vitest";

import type { ChatSummary } from "@/lib/types";

const connectSpy = vi.fn();
const refreshSpy = vi.fn();
const createChatSpy = vi.fn().mockResolvedValue("chat-1");
const deleteChatSpy = vi.fn();
let mockSessions: ChatSummary[] = [];

vi.mock("@/hooks/useSessions", async (importOriginal) => {
  const React = await import("react");
  const actual = await importOriginal<typeof import("@/hooks/useSessions")>();
  return {
    ...actual,
    useSessions: () => {
      const [sessions, setSessions] = React.useState(mockSessions);
      return {
        sessions,
        loading: false,
        error: null,
        refresh: refreshSpy,
        createChat: createChatSpy,
        deleteChat: async (key: string) => {
          await deleteChatSpy(key);
          setSessions((prev: ChatSummary[]) => prev.filter((s) => s.key !== key));
        },
      };
    },
  };
});

vi.mock("@/hooks/useTheme", () => ({
  useTheme: () => ({
    theme: "light" as const,
    toggle: vi.fn(),
  }),
}));

vi.mock("@/lib/bootstrap", () => ({
  fetchBootstrap: vi.fn().mockResolvedValue({
    token: "tok",
    ws_path: "/",
    expires_in: 300,
  }),
  deriveWsUrl: vi.fn(() => "ws://test"),
}));

vi.mock("@/lib/nanobot-client", () => {
  class MockClient {
    status = "idle" as const;
    defaultChatId: string | null = null;
    connect = connectSpy;
    onStatus = () => () => {};
    onError = () => () => {};
    onChat = () => () => {};
    sendMessage = vi.fn();
    newChat = vi.fn();
    attach = vi.fn();
    close = vi.fn();
    updateUrl = vi.fn();
  }

  return { NanobotClient: MockClient };
});

import App from "@/App";

describe("App layout", () => {
  beforeEach(() => {
    mockSessions = [];
    connectSpy.mockClear();
    refreshSpy.mockReset();
    createChatSpy.mockClear();
    deleteChatSpy.mockReset();
    vi.stubGlobal(
      "fetch",
      vi.fn().mockResolvedValue({
        ok: false,
        status: 404,
      }),
    );
  });

  it("keeps sidebar layout out of the main thread width contract", async () => {
    const { container } = render(<App />);

    await waitFor(() => expect(connectSpy).toHaveBeenCalled());

    const main = container.querySelector("main");
    expect(main).toBeInTheDocument();
    expect(main).not.toHaveAttribute("style");

    const asideClassNames = Array.from(container.querySelectorAll("aside")).map(
      (el) => el.className,
    );
    expect(asideClassNames.some((cls) => cls.includes("lg:block"))).toBe(true);
  });

  it("switches to the next session when deleting the active chat", async () => {
    mockSessions = [
      {
        key: "websocket:chat-a",
        channel: "websocket",
        chatId: "chat-a",
        createdAt: "2026-04-16T10:00:00Z",
        updatedAt: "2026-04-16T10:00:00Z",
        preview: "First chat",
      },
      {
        key: "websocket:chat-b",
        channel: "websocket",
        chatId: "chat-b",
        createdAt: "2026-04-16T11:00:00Z",
        updatedAt: "2026-04-16T11:00:00Z",
        preview: "Second chat",
      },
    ];

    render(<App />);

    await waitFor(() => expect(connectSpy).toHaveBeenCalled());
    await waitFor(() =>
      expect(screen.getByRole("button", { name: /^First chat$/ })).toBeInTheDocument(),
    );

    fireEvent.pointerDown(screen.getByLabelText("Chat actions for First chat"), {
      button: 0,
    });
    fireEvent.click(await screen.findByRole("menuitem", { name: "Delete" }));

    await waitFor(() =>
      expect(screen.getByText('Delete “First chat”?')).toBeInTheDocument(),
    );
    fireEvent.click(screen.getByRole("button", { name: "Delete" }));

    await waitFor(() =>
      expect(deleteChatSpy).toHaveBeenCalledWith("websocket:chat-a"),
    );
    await waitFor(() =>
      expect(
        screen.getByRole("button", { name: /^Second chat$/ }),
      ).toBeInTheDocument(),
    );
    expect(screen.queryByText('Delete “First chat”?')).not.toBeInTheDocument();
    expect(document.body.style.pointerEvents).not.toBe("none");
  }, 15_000);

  it("opens the Cursor-style settings view from the sidebar", async () => {
    vi.stubGlobal(
      "fetch",
      vi.fn(async (input: RequestInfo | URL) => {
        if (String(input).includes("/api/settings")) {
          return {
            ok: true,
            status: 200,
            json: async () => ({
              agent: {
                model: "openai/gpt-4o",
                provider: "auto",
                resolved_provider: "openai",
                has_api_key: true,
              },
              providers: [
                { name: "auto", label: "Auto" },
                { name: "openai", label: "OpenAI" },
              ],
              runtime: {
                config_path: "/tmp/config.json",
              },
              requires_restart: false,
            }),
          };
        }
        return { ok: false, status: 404, json: async () => ({}) };
      }),
    );

    render(<App />);

    await waitFor(() => expect(connectSpy).toHaveBeenCalled());
    fireEvent.click(screen.getByRole("button", { name: "Settings" }));

    expect(await screen.findByRole("heading", { name: "General" })).toBeInTheDocument();
    expect(screen.getByText("AI")).toBeInTheDocument();
    expect(screen.getByDisplayValue("openai/gpt-4o")).toBeInTheDocument();
  });
});