/**
 * ActivityTimeline Component Tests
 */

import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { ActivityTimeline } from '@/features/issues/components/ActivityTimeline';
import type { IssueActivity } from '@/features/issues/types';

const mockActivities: IssueActivity[] = [
  {
    id: 'act-1',
    type: 'status_change',
    actor: { id: 'user-1', name: 'Test User', type: 'human' },
    message: 'moved issue from "Open" to "In Progress"',
    timestamp: '2 hours ago',
  },
  {
    id: 'act-2',
    type: 'comment',
    actor: { id: 'agent-1', name: 'Backend Agent', type: 'agent' },
    message: 'Started working on this issue',
    timestamp: '3 hours ago',
  },
  {
    id: 'act-3',
    type: 'created',
    actor: { id: 'user-2', name: 'Product Owner', type: 'human' },
    message: 'created this issue',
    timestamp: '1 day ago',
  },
];

describe('ActivityTimeline', () => {
  it('renders all activities', () => {
    render(<ActivityTimeline activities={mockActivities} />);

    expect(screen.getByText('Test User')).toBeInTheDocument();
    expect(screen.getByText('Backend Agent')).toBeInTheDocument();
    expect(screen.getByText('Product Owner')).toBeInTheDocument();
  });

  it('renders activity messages', () => {
    render(<ActivityTimeline activities={mockActivities} />);

    expect(screen.getByText(/moved issue from "Open" to "In Progress"/)).toBeInTheDocument();
    expect(screen.getByText(/Started working on this issue/)).toBeInTheDocument();
    expect(screen.getByText(/created this issue/)).toBeInTheDocument();
  });

  it('renders timestamps', () => {
    render(<ActivityTimeline activities={mockActivities} />);

    expect(screen.getByText('2 hours ago')).toBeInTheDocument();
    expect(screen.getByText('3 hours ago')).toBeInTheDocument();
    expect(screen.getByText('1 day ago')).toBeInTheDocument();
  });

  it('shows add comment button when callback provided', () => {
    const mockOnAddComment = jest.fn();
    render(<ActivityTimeline activities={mockActivities} onAddComment={mockOnAddComment} />);

    expect(screen.getByRole('button', { name: /add comment/i })).toBeInTheDocument();
  });

  it('calls onAddComment when button is clicked', async () => {
    const user = userEvent.setup();
    const mockOnAddComment = jest.fn();
    render(<ActivityTimeline activities={mockActivities} onAddComment={mockOnAddComment} />);

    await user.click(screen.getByRole('button', { name: /add comment/i }));
    expect(mockOnAddComment).toHaveBeenCalled();
  });

  it('shows empty state when no activities', () => {
    render(<ActivityTimeline activities={[]} />);

    expect(screen.getByText('No activity yet')).toBeInTheDocument();
  });

  it('applies custom className', () => {
    const { container } = render(
      <ActivityTimeline activities={mockActivities} className="custom-class" />
    );

    expect(container.firstChild).toHaveClass('custom-class');
  });

  it('has proper list role for accessibility', () => {
    render(<ActivityTimeline activities={mockActivities} />);

    expect(screen.getByRole('list', { name: /issue activity/i })).toBeInTheDocument();
  });
});