import { render, screen, fireEvent, act } from '@testing-library/react';
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import ClockPicker from '../../../../src/components/tracker/ClockPicker';

describe('ClockPicker', () => {
  const onChange = vi.fn();

  beforeEach(() => {
    vi.clearAllMocks();
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  it('renders initial hour and minute correctly', () => {
    render(<ClockPicker hour={10} minute={30} onChange={onChange} />);
    
    const hourButton = screen.getByRole('button', { name: /hour/i });
    const minuteButton = screen.getByRole('button', { name: /minute/i });

    expect(hourButton).toHaveClass('bg-white');
    expect(minuteButton).toHaveClass('text-gray-500');
  });

  it('switches between hour and minute mode via buttons', () => {
    render(<ClockPicker hour={10} minute={30} onChange={onChange} />);
    
    const minuteButton = screen.getByRole('button', { name: /minute/i });
    fireEvent.click(minuteButton);

    expect(minuteButton).toHaveClass('bg-white');
    expect(screen.getByRole('button', { name: /hour/i })).toHaveClass('text-gray-500');
  });

  it('automatically switches to minute mode after selecting an hour', async () => {
    render(<ClockPicker hour={10} minute={30} onChange={onChange} />);
    
    const dial = screen.getByRole('button', { name: /hour/i }).parentElement?.nextElementSibling as HTMLElement;
    
    // Mock getBoundingClientRect to simulate a center point
    const rect = { left: 0, top: 0, width: 256, height: 256 };
    vi.spyOn(dial, 'getBoundingClientRect').mockReturnValue(rect as DOMRect);

    // Click at the very top (should be 0:00)
    // Angle for 0 is 90 degrees in the component logic. 
    // Center is (128, 128). Top point is (128, 0).
    // x = 0, y = -128. atan2(-128, 0) = -90 deg. + 90 = 0 deg.
    fireEvent.click(dial, { clientX: 128, clientY: 0 });

    expect(onChange).toHaveBeenCalledWith(0, 30);
    
    // Fast-forward timers for the setTimeout in NumberDialPicker
    act(() => {
      vi.runAllTimers();
    });

    // Verify mode changed to minute
    expect(screen.getByRole('button', { name: /minute/i })).toHaveClass('bg-white');
    act(() => {
      vi.runAllTimers();
    });

    // Verify mode changed to minute
    expect(screen.getByRole('button', { name: /minute/i })).toHaveClass('bg-white');
    vi.runAllTimers();

    // Verify mode changed to minute
    expect(screen.getByRole('button', { name: /minute/i })).toHaveClass('bg-white');
  });

  it('updates the correct value based on current mode', () => {
    const { rerender } = render(<ClockPicker hour={10} minute={30} onChange={onChange} />);
    const dial = screen.getByRole('button', { name: /hour/i }).parentElement?.nextElementSibling as HTMLElement;
    vi.spyOn(dial, 'getBoundingClientRect').mockReturnValue({ left: 0, top: 0, width: 256, height: 256 } as DOMRect);

    // 1. Test Hour Update (Mode is Hour)
    // Click at the right side (90 degrees in math). 
    // Center is (128, 128). Right point is (256, 128).
    // x = 128, y = 0. atan2(0, 128) = 0 deg. + 90 = 90 deg.
    // Step for hours is 360/24 = 15. 90/15 = index 6.
    fireEvent.click(dial, { clientX: 256, clientY: 128 });
    expect(onChange).toHaveBeenCalledWith(6, 30);

    vi.clearAllMocks();

    // 2. Test Minute Update (Switch to minute mode)
    fireEvent.click(screen.getByRole('button', { name: /minute/i }));
    
    // Click at the bottom (180 degrees in math). 
    // Center is (128, 128). Bottom point is (128, 256).
    // x = 0, y = 128. atan2(128, 0) = 90 deg. + 90 = 180 deg.
    // Step for minutes is 360/60 = 6. 180/6 = index 30.
    fireEvent.click(dial, { clientX: 128, clientY: 256 });
    expect(onChange).toHaveBeenCalledWith(10, 30); // Wait, the call should be (hour, val)
    // Re-checking implementation: handleNumberChange calls handleTimeChange(hour, val) when mode is minute
    // Since initial hour was 10:
    expect(onChange).toHaveBeenLastCalledWith(10, 30);
  });

  it('handles circular rotation correctly (angle < 0)', () => {
    render(<ClockPicker hour={10} minute={30} onChange={onChange} />);
    const dial = screen.getByRole('button', { name: /hour/i }).parentElement?.nextElementSibling as HTMLElement;
    vi.spyOn(dial, 'getBoundingClientRect').mockReturnValue({ left: 0, top: 0, width: 256, height: 256 } as DOMRect);

    // Click slightly "behind" the start (e.g., 350 degrees)
    // Center (128, 128). Point slightly above center-left.
    // x = -10, y = -128. atan2(-128, -10) is approx -94 deg. + 90 = -4 deg.
    // Code handles angle < 0 by adding 360 -> 356 deg.
    fireEvent.click(dial, { clientX: 118, clientY: 0 });
    
    // Verify it didn't crash and called onChange with a valid index
    expect(onChange).toHaveBeenCalled();
    const lastCall = vi.mocked(onChange).mock.calls[0][0];
    expect(lastCall).toBeGreaterThanOrEqual(0);
    expect(lastCall).toBeLessThan(24);
  });
});