import { describe, it, expect, vi, beforeEach } from 'vitest';
import { render, screen, fireEvent, waitFor } from '@testing-library/react';
import { AutodraftSettings } from '~/components/AutodraftSettings';

// Mock fetch
global.fetch = vi.fn();

describe('AutodraftSettings Component', () => {
  const defaultProps = {
    seasonId: 'season-123',
    teamId: 'team-456',
    isEnabled: false,
    mode: 'next_pick' as const,
    isMyTurn: false,
    onUpdate: vi.fn(),
  };

  beforeEach(() => {
    vi.clearAllMocks();
    (global.fetch as any).mockResolvedValue({
      ok: true,
      json: async () => ({ success: true }),
    });
  });

  describe('Rendering', () => {
    it('should render the autodraft switch', () => {
      render(<AutodraftSettings {...defaultProps} />);
      
      expect(screen.getByText('Autodraft')).toBeInTheDocument();
      expect(screen.getByRole('switch')).toBeInTheDocument();
    });

    it('should not show mode options when autodraft is disabled', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      
      expect(screen.queryByText('Next Pick')).not.toBeInTheDocument();
      expect(screen.queryByText('While On')).not.toBeInTheDocument();
    });

    it('should show mode options when autodraft is enabled', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} />);
      
      expect(screen.getByText('Next Pick')).toBeInTheDocument();
      expect(screen.getByText('While On')).toBeInTheDocument();
    });

    it('should show disabled message when it is user turn', () => {
      render(<AutodraftSettings {...defaultProps} isMyTurn={true} />);
      
      expect(screen.getByText(/Autodraft settings are disabled during your pick/i)).toBeInTheDocument();
    });
  });

  describe('Switch Toggle', () => {
    it('should enable autodraft when switch is toggled on', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} onUpdate={onUpdate} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalledWith(
          '/api/autodraft/update',
          expect.objectContaining({
            method: 'POST',
          })
        );
      });

      await waitFor(() => {
        expect(onUpdate).toHaveBeenCalledWith(true, 'next_pick');
      });
    });

    it('should disable autodraft when switch is toggled off', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} isEnabled={true} onUpdate={onUpdate} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalled();
      });

      await waitFor(() => {
        expect(onUpdate).toHaveBeenCalledWith(false, 'next_pick');
      });
    });

    it('should be disabled when it is user turn', () => {
      render(<AutodraftSettings {...defaultProps} isMyTurn={true} />);
      
      const switchElement = screen.getByRole('switch');
      expect(switchElement).toBeDisabled();
    });

    it('should handle API errors gracefully', async () => {
      const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
      (global.fetch as any).mockResolvedValueOnce({
        ok: false,
        json: async () => ({ error: 'Server error' }),
      });

      render(<AutodraftSettings {...defaultProps} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      await waitFor(() => {
        expect(consoleSpy).toHaveBeenCalled();
      });

      // Switch should revert to original state
      expect(switchElement).not.toBeChecked();

      consoleSpy.mockRestore();
    });
  });

  describe('Mode Selection', () => {
    it('should select next_pick mode by default', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" />);
      
      const nextPickRadio = screen.getByRole('radio', { name: /next pick/i });
      expect(nextPickRadio).toBeChecked();
    });

    it('should select while_on mode when specified', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="while_on" />);
      
      const whileOnRadio = screen.getByRole('radio', { name: /while on/i });
      expect(whileOnRadio).toBeChecked();
    });

    it('should change mode when radio button is clicked', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" onUpdate={onUpdate} />);
      
      const whileOnRadio = screen.getByRole('radio', { name: /while on/i });
      fireEvent.click(whileOnRadio);

      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalled();
      });

      await waitFor(() => {
        expect(onUpdate).toHaveBeenCalledWith(true, 'while_on');
      });
    });

    it('should disable mode selection when it is user turn', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} isMyTurn={true} />);
      
      const nextPickRadio = screen.getByRole('radio', { name: /next pick/i });
      const whileOnRadio = screen.getByRole('radio', { name: /while on/i });

      expect(nextPickRadio).toBeDisabled();
      expect(whileOnRadio).toBeDisabled();
    });
  });

  describe('API Integration', () => {
    it('should send correct data when enabling autodraft', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalledWith(
          '/api/autodraft/update',
          expect.objectContaining({
            method: 'POST',
            body: expect.any(FormData),
          })
        );
      });

      const fetchCall = (global.fetch as any).mock.calls[0];
      const formData = fetchCall[1].body as FormData;
      
      expect(formData.get('seasonId')).toBe('season-123');
      expect(formData.get('teamId')).toBe('team-456');
      expect(formData.get('isEnabled')).toBe('true');
      expect(formData.get('mode')).toBe('next_pick');
    });

    it('should send correct data when changing mode', async () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" />);
      
      const whileOnRadio = screen.getByRole('radio', { name: /while on/i });
      fireEvent.click(whileOnRadio);

      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalled();
      });

      const fetchCall = (global.fetch as any).mock.calls[0];
      const formData = fetchCall[1].body as FormData;
      
      expect(formData.get('mode')).toBe('while_on');
      expect(formData.get('isEnabled')).toBe('true');
    });

    it('should show loading state during API call', async () => {
      let resolvePromise: any;
      const fetchPromise = new Promise((resolve) => {
        resolvePromise = resolve;
      });
      (global.fetch as any).mockReturnValueOnce(fetchPromise);

      render(<AutodraftSettings {...defaultProps} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      // Switch should be disabled during update
      await waitFor(() => {
        expect(switchElement).toBeDisabled();
      });

      // Resolve the promise
      resolvePromise({ ok: true, json: async () => ({ success: true }) });

      // Switch should be enabled again
      await waitFor(() => {
        expect(switchElement).not.toBeDisabled();
      });
    });
  });

  describe('Edge Cases', () => {
    it('should handle rapid toggle clicks', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      
      const switchElement = screen.getByRole('switch');
      
      // Click multiple times rapidly
      fireEvent.click(switchElement);
      fireEvent.click(switchElement);
      fireEvent.click(switchElement);

      // Should only process the first click while updating
      await waitFor(() => {
        expect(global.fetch).toHaveBeenCalledTimes(1);
      });
    });

    it('should handle network errors', async () => {
      const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
      (global.fetch as any).mockRejectedValueOnce(new Error('Network error'));

      render(<AutodraftSettings {...defaultProps} />);
      
      const switchElement = screen.getByRole('switch');
      fireEvent.click(switchElement);

      await waitFor(() => {
        expect(consoleSpy).toHaveBeenCalled();
      });

      consoleSpy.mockRestore();
    });

    it('should maintain state consistency on error', async () => {
      (global.fetch as any).mockResolvedValueOnce({
        ok: false,
        json: async () => ({ error: 'Server error' }),
      });

      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      
      const switchElement = screen.getByRole('switch');
      expect(switchElement).not.toBeChecked();
      
      fireEvent.click(switchElement);

      // Should revert to original state on error
      await waitFor(() => {
        expect(switchElement).not.toBeChecked();
      });
    });
  });
});