import { renderHook, act } from '@testing-library/react';
import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { useNotifications } from './useNotifications';
import type { Node } from '@/context/NodeContext';
import type { NotificationItem } from '../../dashboard/types';

vi.mock('@/lib/api', () => ({
  apiFetch: vi.fn(),
  fetchForNode: vi.fn(),
}));
vi.mock('@/components/ui/toast-store', () => ({ toast: { error: vi.fn() } }));

import { apiFetch } from '@/lib/api';

const localNode: Node = { id: 1, name: 'Local', type: 'local', api_url: '', api_token: '', compose_dir: '', is_default: true, status: 'online', created_at: 0 };

const makeNotif = (overrides: Partial<NotificationItem> = {}): NotificationItem => ({
  id: 1, level: 'info', message: 'test', timestamp: 1000, is_read: 0, ...overrides,
});

class MockWS {
  static instances: MockWS[] = [];
  onopen: (() => void) | null = null;
  onmessage: ((e: { data: string }) => void) | null = null;
  onclose: ((e: { code: number }) => void) | null = null;
  onerror: ((e: unknown) => void) | null = null;
  readyState = 1; // OPEN
  send = vi.fn();
  close = vi.fn();
  constructor(_url: string) { MockWS.instances.push(this); }
  static reset() { MockWS.instances = []; }
}

beforeEach(() => {
  MockWS.reset();
  vi.stubGlobal('WebSocket', MockWS);
  (apiFetch as ReturnType<typeof vi.fn>).mockResolvedValue({ ok: false });
});
afterEach(() => { vi.unstubAllGlobals(); vi.clearAllMocks(); });

describe('useNotifications', () => {
  it('starts with empty notifications and disconnected state', () => {
    const { result } = renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    expect(result.current.notifications).toEqual([]);
    expect(result.current.tickerConnected).toBe(false);
  });

  it('opens a local notification WebSocket on mount', () => {
    renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    expect(MockWS.instances.length).toBeGreaterThanOrEqual(1);
    expect(MockWS.instances[0]).toBeDefined();
  });

  it('sets tickerConnected true when local WS opens', () => {
    const { result } = renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    act(() => { MockWS.instances[0]?.onopen?.(); });
    expect(result.current.tickerConnected).toBe(true);
  });

  it('adds notification when local WS receives notification message', () => {
    const { result } = renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    act(() => { MockWS.instances[0]?.onopen?.(); });
    act(() => {
      MockWS.instances[0]?.onmessage?.({
        data: JSON.stringify({ type: 'notification', payload: makeNotif({ id: 42, message: 'hello' }) }),
      });
    });
    expect(result.current.notifications).toHaveLength(1);
    expect(result.current.notifications[0].message).toBe('hello');
  });

  it('clearAllNotifications empties the local state', async () => {
    (apiFetch as ReturnType<typeof vi.fn>).mockResolvedValue({ ok: true });
    const { result } = renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    act(() => { MockWS.instances[0]?.onopen?.(); });
    act(() => {
      MockWS.instances[0]?.onmessage?.({
        data: JSON.stringify({ type: 'notification', payload: makeNotif({ id: 1 }) }),
      });
    });
    expect(result.current.notifications).toHaveLength(1);
    await act(async () => { await result.current.clearAllNotifications(); });
    expect(result.current.notifications).toHaveLength(0);
  });

  it('deleteNotification removes the matching item', async () => {
    (apiFetch as ReturnType<typeof vi.fn>).mockResolvedValue({ ok: true });
    const { result } = renderHook(() =>
      useNotifications({ nodes: [localNode], onStateInvalidate: vi.fn(), onAutoUpdateChange: vi.fn() }),
    );
    act(() => { MockWS.instances[0]?.onopen?.(); });
    const notif = makeNotif({ id: 5, nodeId: localNode.id });
    act(() => {
      MockWS.instances[0]?.onmessage?.({
        data: JSON.stringify({ type: 'notification', payload: notif }),
      });
    });
    await act(async () => { await result.current.deleteNotification({ ...notif, nodeId: localNode.id }); });
    expect(result.current.notifications).toHaveLength(0);
  });
});