// @vitest-environment jsdom

import '@testing-library/jest-dom/vitest';
import { act, cleanup, render, screen, within } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { MemoryRouter } from 'react-router-dom';
import { afterEach, describe, expect, it, vi } from 'vitest';
import type { DashboardEvent } from '../../packages/api-contracts/src/index.js';
import {
  NotificationBell,
  NotificationProvider,
  NotificationViewport,
  notificationForEvent,
  shouldToastForEvent,
} from '../../apps/dashboard/src/app/notifications.js';

class FakeRealtime {
  private listener?: (event: DashboardEvent) => void;

  subscribe(listener: (event: DashboardEvent) => void): () => void {
    this.listener = listener;
    return () => { this.listener = undefined; };
  }

  emit(event: DashboardEvent): void {
    this.listener?.(event);
  }
}

afterEach(() => {
  cleanup();
  globalThis.localStorage.clear();
  vi.restoreAllMocks();
  vi.useRealTimers();
});

describe('dashboard notifications', () => {
  it('turns actionable realtime events into useful notification copy', () => {
    expect(notificationForEvent({
      id: 'reply-1',
      occurredAt: '2026-08-09T09:30:00.000Z',
      type: 'reply.received',
      payload: { conversationId: 'room/one', replyId: 'message-1', sender: 'alice', preview: 'Sounds good!' },
    })).toMatchObject({
      title: 'New reply from u/alice',
      message: 'Sounds good!',
      tone: 'success',
      href: '/conversations/room%2Fone',
    });

    expect(notificationForEvent({
      id: 'log-1',
      occurredAt: '2026-08-09T09:30:00.000Z',
      type: 'log.created',
      payload: { level: 'info', message: 'Routine detail' },
    })).toBeNull();
  });

  it('shows new events as toasts and keeps them in a readable notification centre', async () => {
    const realtime = new FakeRealtime();
    const user = userEvent.setup();
    render(
      <MemoryRouter>
        <NotificationProvider realtime={realtime}>
          <NotificationBell />
          <NotificationViewport />
        </NotificationProvider>
      </MemoryRouter>,
    );

    expect(screen.getByRole('button', { name: 'Notifications' })).toBeInTheDocument();
    act(() => realtime.emit({
      id: 'reply-1',
      occurredAt: '2026-08-09T09:30:00.000Z',
      type: 'reply.received',
      payload: { conversationId: 'conversation-1', replyId: 'message-1', sender: 'alice', preview: 'Sounds good!' },
    }));

    const toast = screen.getByRole('status');
    expect(toast).toHaveTextContent('New reply from u/alice');
    expect(screen.getByRole('button', { name: 'Notifications, 1 unread' })).toBeInTheDocument();

    await user.click(screen.getByRole('button', { name: 'Notifications, 1 unread' }));
    const centre = screen.getByLabelText('Notifications', { selector: 'aside' });
    expect(centre).toHaveClass('is-open');
    expect(within(centre).getByText('Sounds good!')).toBeInTheDocument();
    expect(within(centre).getByRole('link', { name: /New reply from u\/alice/ })).toHaveAttribute(
      'href',
      '/conversations/conversation-1',
    );
    expect(screen.getByRole('button', { name: 'Notifications' })).toBeInTheDocument();

    await user.click(within(centre).getByRole('button', { name: 'Clear all' }));
    expect(within(centre).getByText('All quiet')).toBeInTheDocument();
  });

  it('keeps routine sync completions in the notification centre without showing a toast', async () => {
    const realtime = new FakeRealtime();
    const user = userEvent.setup();
    render(
      <MemoryRouter>
        <NotificationProvider realtime={realtime}>
          <NotificationBell />
          <NotificationViewport />
        </NotificationProvider>
      </MemoryRouter>,
    );

    const syncEvent: DashboardEvent = {
      id: 'sync-1',
      occurredAt: '2026-08-09T09:30:00.000Z',
      type: 'sync.completed',
      payload: { syncId: 'conversation-sync-1', kind: 'conversations', processed: 12 },
    };
    expect(shouldToastForEvent(syncEvent)).toBe(false);
    act(() => realtime.emit(syncEvent));

    expect(screen.queryByRole('status')).not.toBeInTheDocument();
    await user.click(screen.getByRole('button', { name: 'Notifications, 1 unread' }));
    expect(within(screen.getByLabelText('Notifications', { selector: 'aside' })).getByText('Conversations sync complete'))
      .toBeInTheDocument();
  });

  it('keeps important event toasts visible until they are dismissed', async () => {
    vi.useFakeTimers();
    const realtime = new FakeRealtime();
    render(
      <MemoryRouter>
        <NotificationProvider realtime={realtime}>
          <NotificationViewport />
        </NotificationProvider>
      </MemoryRouter>,
    );

    act(() => realtime.emit({
      id: 'media-1',
      occurredAt: '2026-08-09T09:30:00.000Z',
      type: 'media.received',
      payload: { conversationId: 'conversation-1', sender: 'alice', count: 1 },
    }));
    expect(screen.getByRole('status')).toHaveTextContent('Image received from u/alice');

    act(() => vi.advanceTimersByTime(60_000));
    expect(screen.getByRole('status')).toBeInTheDocument();

    act(() => screen.getByRole('button', { name: 'Dismiss Image received from u/alice' }).click());
    expect(screen.queryByRole('status')).not.toBeInTheDocument();
  });
});