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

describe('Button', () => {
  it('renders with default variant', () => {
    render(<Button>Click me</Button>);
    expect(screen.getByRole('button')).toHaveTextContent('Click me');
  });

  it('applies custom className', () => {
    render(<Button className="custom-class">Test</Button>);
    expect(screen.getByRole('button')).toHaveClass('custom-class');
  });

  it('renders with different variants', () => {
    const { rerender } = render(<Button variant="destructive">Delete</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();

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

    rerender(<Button variant="ghost">Ghost</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();

    rerender(<Button variant="amber">Amber</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();

    rerender(<Button variant="blue">Blue</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();
  });

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

    rerender(<Button size="lg">Large</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();

    rerender(<Button size="icon">I</Button>);
    expect(screen.getByRole('button')).toBeInTheDocument();
  });

  it('forwards ref correctly', () => {
    const ref = { current: null };
    render(<Button ref={ref}>Ref</Button>);
    expect(ref.current).toBeInstanceOf(HTMLButtonElement);
  });

  it('is disabled when disabled prop is true', () => {
    render(<Button disabled>Disabled</Button>);
    expect(screen.getByRole('button')).toBeDisabled();
  });

  it('buttonVariants returns correct class string', () => {
    const classes = buttonVariants({ variant: 'default', size: 'default' });
    expect(typeof classes).toBe('string');
    expect(classes.length).toBeGreaterThan(0);
  });
});