import { describe, it, expect, vi, beforeEach } from 'vitest';
import { screen, fireEvent, waitFor } from '@testing-library/react';
import '@testing-library/jest-dom';
import SleepButton from '../../src/components/tracker/SleepButton';
import { useSleepSession } from '../../src/hooks/useSleepSession';
import { renderWithProviders } from '../test-utils';

vi.mock('../../src/hooks/useSleepSession', () => ({
  useSleepSession: vi.fn(),
}));

describe('SleepButton', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('renders "Start Sleep" when no active session', async () => {
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: null,
      isCreating: false,
      isEnding: false,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T12:00" />);
    expect(screen.getByRole('button', { name: /Start Sleep/i })).toBeInTheDocument();
  });

  it('renders "Stop Sleep" when session is active', async () => {
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: { id: 1, start_time: '2024-01-01T12:00' },
      isCreating: false,
      isEnding: false,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T12:00" />);
    expect(screen.getByRole('button', { name: /Stop Sleep/i })).toBeInTheDocument();
  });

  it('calls createSession when no active session and button is clicked', async () => {
    const createSessionMock = vi.fn();
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: null,
      isCreating: false,
      isEnding: false,
      createSession: createSessionMock,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T12:00" />);
    const button = screen.getByRole('button', { name: /Start Sleep/i });
    fireEvent.click(button);

    await waitFor(() => expect(createSessionMock).toHaveBeenCalledWith({ start_time: '2024-01-01T12:00' }));
  });

  it('calls endSession when session is active and button is clicked', async () => {
    const endSessionMock = vi.fn();
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: { id: 1, start_time: '2024-01-01T12:00' },
      isCreating: false,
      isEnding: false,
      endSession: endSessionMock,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T14:00" />);
    const button = screen.getByRole('button', { name: /Stop Sleep/i });
    fireEvent.click(button);

    await waitFor(() => expect(endSessionMock).toHaveBeenCalledWith({ sessionId: 1, endTime: '2024-01-01T14:00' }));
  });

  it('handles endSession error gracefully', async () => {
    const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
    const endSessionMock = vi.fn().mockRejectedValue(new Error('Failed to stop'));
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: { id: 1, start_time: '2024-01-01T12:00' },
      isCreating: false,
      isEnding: false,
      endSession: endSessionMock,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T14:00" />);
    const button = screen.getByRole('button', { name: /Stop Sleep/i });
    fireEvent.click(button);

    await waitFor(() => expect(consoleSpy).toHaveBeenCalledWith('Failed to update sleep session:', 'Failed to stop'));
    consoleSpy.mockRestore();
  });

  it('handles createSession error gracefully', async () => {
    const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
    const createSessionMock = vi.fn().mockRejectedValue(new Error('Failed to start'));
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: null,
      isCreating: false,
      isEnding: false,
      createSession: createSessionMock,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T14:00" />);
    const button = screen.getByRole('button', { name: /Start Sleep/i });
    fireEvent.click(button);

    await waitFor(() => expect(consoleSpy).toHaveBeenCalledWith('Failed to update sleep session:', 'Failed to start'));
    consoleSpy.mockRestore();
  });

  it('shows alert when time is invalid', async () => {
    const alertSpy = vi.spyOn(window, 'alert').mockImplementation(() => {});
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: null,
      isCreating: false,
      isEnding: false,
    } as any);

    renderWithProviders(<SleepButton time="" />);
    const button = screen.getByRole('button', { name: /Start Sleep/i });
    fireEvent.click(button);

    expect(alertSpy).toHaveBeenCalledWith('Please select a valid time.');
    alertSpy.mockRestore();
  });

  it('renders "Processing..." and disables button when isCreating is true', async () => {
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: null,
      isCreating: true,
      isEnding: false,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T12:00" />);
    const button = screen.getByRole('button');

    expect(button).toBeDisabled();
    expect(screen.getByText(/Processing.../i)).toBeInTheDocument();
  });

  it('renders "Processing..." and disables button when isEnding is true', async () => {
    vi.mocked(useSleepSession).mockReturnValue({
      activeSession: { id: 1, start_time: '2024-01-01T12:00' },
      isCreating: false,
      isEnding: true,
    } as any);

    renderWithProviders(<SleepButton time="2024-01-01T14:00" />);
    const button = screen.getByRole('button');

    expect(button).toBeDisabled();
    expect(screen.getByText(/Processing.../i)).toBeInTheDocument();
  });
});