import { render } from '@testing-library/react';
import '@testing-library/jest-dom';
import { ScrollProgress } from './scroll-progress';

// Mock useReducedMotion
jest.mock('@/hooks/use-reduced-motion', () => ({
  useReducedMotion: () => false,
}));

describe('ScrollProgress', () => {
  beforeEach(() => {
    jest.clearAllMocks();
    // Mock document/scroll geometry for predictable progress calculation
    Object.defineProperty(document.documentElement, 'scrollHeight', {
      value: 1000,
      configurable: true,
    });
    Object.defineProperty(window, 'innerHeight', {
      value: 500,
      configurable: true,
    });
    Object.defineProperty(window, 'scrollY', {
      value: 0,
      configurable: true,
      writable: true,
    });
  });

  it('should always render the progress container', () => {
    const { container } = render(<ScrollProgress />);
    // ScrollProgress 始终渲染（带 aria-hidden="true"）
    expect(container.firstChild).not.toBeNull();
  });

  it('should have aria-hidden="true" for decorative purposes', () => {
    const { container } = render(<ScrollProgress />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper).toHaveAttribute('aria-hidden', 'true');
  });

  it('should apply fixed positioning class', () => {
    const { container } = render(<ScrollProgress />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper).toHaveClass('fixed');
    expect(wrapper).toHaveClass('pointer-events-none');
  });

  it('should render inner progress bar div', () => {
    const { container } = render(<ScrollProgress />);
    const innerBar = (container.firstChild as HTMLElement).firstChild as HTMLElement;
    expect(innerBar).toBeInTheDocument();
    // 默认 progress 为 0，使用 transform scaleX 实现宽度变化
    expect(innerBar.style.width).toBe('100%');
    expect(innerBar.style.transform).toBe('scaleX(0)');
    expect(innerBar.style.transformOrigin).toBe('left');
  });

  it('should apply default height of 2px', () => {
    const { container } = render(<ScrollProgress />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper.style.height).toBe('2px');
  });

  it('should support custom height', () => {
    const { container } = render(<ScrollProgress height={4} />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper.style.height).toBe('4px');
  });

  it('should apply default top position', () => {
    const { container } = render(<ScrollProgress />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper.style.top).toBe('0px');
  });

  it('should support bottom position', () => {
    const { container } = render(<ScrollProgress position="bottom" />);
    const wrapper = container.firstChild as HTMLElement;
    expect(wrapper.style.bottom).toBe('0px');
  });

  it('should use brand color by default', () => {
    const { container } = render(<ScrollProgress />);
    const innerBar = (container.firstChild as HTMLElement).firstChild as HTMLElement;
    expect(innerBar.style.background).toBe('var(--color-brand)');
  });

  it('should support custom color', () => {
    const { container } = render(<ScrollProgress color="#ff0000" />);
    const innerBar = (container.firstChild as HTMLElement).firstChild as HTMLElement;
    // jsdom 将 #ff0000 转换为 rgb(255, 0, 0)
    expect(innerBar.style.background).toContain('255');
    expect(innerBar.style.background).toContain('0');
  });
});
