import { render, screen, fireEvent } from '@testing-library/react';
import { describe, it, expect, vi } from 'vitest';
import { Button } from './button';

describe('Button Component', () => {
  it('renders with default props', () => {
    render(<Button>Click me</Button>);

    const button = screen.getByRole('button', { name: /click me/i });
    expect(button).toBeInTheDocument();
    expect(button).toHaveClass('bg-primary');
  });

  it('renders with different variants', () => {
    const { rerender } = render(<Button variant="secondary">Secondary</Button>);
    expect(screen.getByRole('button')).toHaveClass('bg-muted/30');

    rerender(<Button variant="destructive">Destructive</Button>);
    expect(screen.getByRole('button')).toHaveClass('bg-destructive/10');

    rerender(<Button variant="outline">Outline</Button>);
    expect(screen.getByRole('button')).toHaveClass('border');
  });

  it('renders with different sizes', () => {
    const { rerender } = render(<Button size="sm">Small</Button>);
    expect(screen.getByRole('button')).toHaveClass('h-9');

    rerender(<Button size="lg">Large</Button>);
    expect(screen.getByRole('button')).toHaveClass('h-12');

    rerender(<Button size="icon">Icon</Button>);
    expect(screen.getByRole('button')).toHaveClass('h-10');
  });

  it('handles click events', () => {
    const handleClick = vi.fn();
    render(<Button onClick={handleClick}>Click me</Button>);

    const button = screen.getByRole('button');
    fireEvent.click(button);

    expect(handleClick).toHaveBeenCalledTimes(1);
  });

  it('can be disabled', () => {
    const handleClick = vi.fn();
    render(
      <Button disabled onClick={handleClick}>
        Disabled
      </Button>,
    );

    const button = screen.getByRole('button');
    expect(button).toBeDisabled();

    fireEvent.click(button);
    expect(handleClick).not.toHaveBeenCalled();
  });

  it('applies custom className', () => {
    render(<Button className="custom-class">Custom</Button>);

    const button = screen.getByRole('button');
    expect(button).toHaveClass('custom-class');
  });

  it('renders as different element when asChild is true', () => {
    render(
      <Button asChild>
        <a href="/test">Link Button</a>
      </Button>,
    );

    const link = screen.getByRole('link');
    expect(link).toBeInTheDocument();
    expect(link).toHaveAttribute('href', '/test');
  });

  it('forwards ref correctly', () => {
    const ref = vi.fn();
    render(<Button ref={ref}>Ref Button</Button>);

    expect(ref).toHaveBeenCalled();
  });

  it('supports loading state', () => {
    render(<Button loading>Loading</Button>);

    const button = screen.getByRole('button');
    expect(button).toBeDisabled();
    expect(button).toHaveClass('opacity-70');
  });

  it('renders with icon when provided', () => {
    const TestIcon = () => <span data-testid="test-icon">Icon</span>;
    render(<Button icon={<TestIcon />}>With Icon</Button>);

    expect(screen.getByTestId('test-icon')).toBeInTheDocument();
  });
});