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

vi.mock('sonner', () => ({
  toast: { success: vi.fn(), error: vi.fn(), info: vi.fn() },
}));

global.fetch = vi.fn();

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

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

  // ─── Rendering ────────────────────────────────────────────────────────────

  describe('Rendering', () => {
    it('renders all four option buttons', () => {
      render(<AutodraftSettings {...defaultProps} />);

      expect(screen.getByRole('button', { name: 'Off' })).toBeInTheDocument();
      expect(screen.getByRole('button', { name: 'Next in Queue' })).toBeInTheDocument();
      expect(screen.getByRole('button', { name: 'All in Queue' })).toBeInTheDocument();
      expect(screen.getByRole('button', { name: 'All Picks' })).toBeInTheDocument();
    });

    it('does not render a queue-only toggle switch', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} />);
      expect(screen.queryByRole('switch')).not.toBeInTheDocument();
    });

    it('shows "You\'re on the clock!" when isMyTurn=true', () => {
      render(<AutodraftSettings {...defaultProps} isMyTurn={true} />);
      expect(screen.getByText(/You're on the clock!/i)).toBeInTheDocument();
    });

    it('marks Off as active (muted border) when isEnabled=false', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      expect(screen.getByRole('button', { name: 'Off' }).className).toContain(
        'border-l-muted-foreground'
      );
    });

    it('marks Next in Queue as active when isEnabled=true, mode=next_pick', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" queueOnly={true} />);
      expect(screen.getByRole('button', { name: 'Next in Queue' }).className).toContain('bg-electric');
    });

    it('marks All in Queue as active when isEnabled=true, mode=while_on, queueOnly=true', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="while_on" queueOnly={true} />);
      expect(screen.getByRole('button', { name: 'All in Queue' }).className).toContain('bg-electric');
    });

    it('marks All Picks as active when isEnabled=true, mode=while_on, queueOnly=false', () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="while_on" queueOnly={false} />);
      expect(screen.getByRole('button', { name: 'All Picks' }).className).toContain('bg-electric');
    });
  });

  // ─── Interaction ──────────────────────────────────────────────────────────

  describe('Button interaction', () => {
    it('switches to Next in Queue and calls onUpdate with correct args', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} onUpdate={onUpdate} />);

      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

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

    it('switches to All in Queue and calls onUpdate with correct args', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} onUpdate={onUpdate} />);

      fireEvent.click(screen.getByRole('button', { name: 'All in Queue' }));

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

    it('switches to All Picks and calls onUpdate with correct args', async () => {
      const onUpdate = vi.fn();
      render(<AutodraftSettings {...defaultProps} onUpdate={onUpdate} />);

      fireEvent.click(screen.getByRole('button', { name: 'All Picks' }));

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

    it('switches to Off and calls onUpdate with isEnabled=false', async () => {
      const onUpdate = vi.fn();
      render(
        <AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" queueOnly={true} onUpdate={onUpdate} />
      );

      fireEvent.click(screen.getByRole('button', { name: 'Off' }));

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

    it('disables all buttons when isMyTurn=true', () => {
      render(<AutodraftSettings {...defaultProps} isMyTurn={true} />);

      expect(screen.getByRole('button', { name: 'Off' })).toBeDisabled();
      expect(screen.getByRole('button', { name: 'Next in Queue' })).toBeDisabled();
      expect(screen.getByRole('button', { name: 'All in Queue' })).toBeDisabled();
      expect(screen.getByRole('button', { name: 'All Picks' })).toBeDisabled();
    });

    it('does not call fetch when a button is clicked during the user\'s turn', () => {
      render(<AutodraftSettings {...defaultProps} isMyTurn={true} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));
      expect(global.fetch).not.toHaveBeenCalled();
    });

    it('does not re-fire when the already-active option is clicked', async () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      fireEvent.click(screen.getByRole('button', { name: 'Off' }));
      expect(global.fetch).not.toHaveBeenCalled();
    });
  });

  // ─── Optimistic UI ────────────────────────────────────────────────────────

  describe('Optimistic UI', () => {
    it('does not disable buttons while a fetch is in flight', async () => {
      let resolve: ((v: any) => void) | undefined;
      (global.fetch as any).mockReturnValueOnce(new Promise((r) => { resolve = r; }));

      render(<AutodraftSettings {...defaultProps} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

      // Buttons stay enabled — optimistic UI does not block interaction
      expect(screen.getByRole('button', { name: 'Off' })).not.toBeDisabled();

      resolve?.({ ok: true, json: async () => ({ success: true }) });
    });

    it('fires a fetch for every rapid click, aborting previous in-flight requests', async () => {
      render(<AutodraftSettings {...defaultProps} />);

      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));
      fireEvent.click(screen.getByRole('button', { name: 'All in Queue' }));
      fireEvent.click(screen.getByRole('button', { name: 'Off' }));

      await waitFor(() => expect(global.fetch).toHaveBeenCalledTimes(3));
    });
  });

  // ─── Error handling ───────────────────────────────────────────────────────

  describe('Error handling', () => {
    it('reverts to the previous state on a non-ok API response', async () => {
      (global.fetch as any).mockResolvedValueOnce({ ok: false });

      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

      await waitFor(() => {
        expect(screen.getByRole('button', { name: 'Off' }).className).toContain(
          'border-l-muted-foreground'
        );
      });
    });

    it('reverts to the previous state on a network error', async () => {
      (global.fetch as any).mockRejectedValueOnce(new Error('Network error'));

      render(<AutodraftSettings {...defaultProps} isEnabled={false} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

      await waitFor(() => {
        expect(screen.getByRole('button', { name: 'Off' }).className).toContain(
          'border-l-muted-foreground'
        );
      });
    });
  });

  // ─── API payload ──────────────────────────────────────────────────────────

  describe('API payload', () => {
    it('posts correct formData for Next in Queue (next_pick, queueOnly=true)', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

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

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

    it('posts correct formData for All in Queue (while_on, queueOnly=true)', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      fireEvent.click(screen.getByRole('button', { name: 'All in Queue' }));

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

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

    it('posts correct formData for All Picks (while_on, queueOnly=false)', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      fireEvent.click(screen.getByRole('button', { name: 'All Picks' }));

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

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

    it('posts isEnabled=false for Off', async () => {
      render(<AutodraftSettings {...defaultProps} isEnabled={true} mode="next_pick" queueOnly={true} />);
      fireEvent.click(screen.getByRole('button', { name: 'Off' }));

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

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

    it('passes an AbortSignal to fetch', async () => {
      render(<AutodraftSettings {...defaultProps} />);
      fireEvent.click(screen.getByRole('button', { name: 'Next in Queue' }));

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

      const options = (global.fetch as any).mock.calls[0][1];
      expect(options.signal).toBeInstanceOf(AbortSignal);
    });
  });
});
