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

// Mock next-intl — passthrough t(key) => key
vi.mock('next-intl', () => ({
  useTranslations: () => (key: string) => key,
}));

// Mock @/lib/dashboard-api — spy on updateWidgetConfig
vi.mock('@/lib/dashboard-api', () => ({
  updateWidgetConfig: vi.fn().mockResolvedValue(undefined),
}));

// Import mocked function for assertions
import { updateWidgetConfig } from '@/lib/dashboard-api';

// Must import AFTER mocks
import { StopwatchWidget } from './stopwatch-widget';

describe('StopwatchWidget', () => {
  beforeEach(() => {
    // Use fake timers for deterministic testing
    vi.useFakeTimers();
    vi.clearAllMocks();
  });

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

  it('renders 00:00 and Start button with empty config', () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    expect(screen.getByTestId('stopwatch-display')).toHaveTextContent('00:00');
    // Button with accessible name matching the translation key 'stopwatch.start'
    expect(
      screen.getByRole('button', { name: /stopwatch\.start/i }),
    ).toBeInTheDocument();
  });

  it('clicking Start persists state=running with startedAt ISO string', async () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    const startBtn = screen.getByRole('button', { name: /stopwatch\.start/i });
    await act(async () => {
      fireEvent.click(startBtn);
    });

    expect(updateWidgetConfig).toHaveBeenCalledWith(
      'sw-1',
      expect.objectContaining({
        state: 'running',
        startedAt: expect.stringMatching(/^\d{4}-\d{2}-\d{2}T/),
      }),
      expect.anything(),
    );
  });

  it('advances display after 3000ms while running', async () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.start/i }));
    });

    await act(async () => {
      vi.advanceTimersByTime(3000);
    });

    const display = screen.getByTestId('stopwatch-display').textContent ?? '';
    // Display should show 00:03 (or similar — just not 00:00)
    expect(display).not.toBe('00:00');
  });

  it('Stop/Pause freezes display and persists state=paused', async () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    // Start the stopwatch
    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.start/i }));
    });

    await act(async () => {
      vi.advanceTimersByTime(2000);
    });

    // Stop it
    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.stop/i }));
    });

    expect(updateWidgetConfig).toHaveBeenLastCalledWith(
      'sw-1',
      expect.objectContaining({
        state: 'paused',
        startedAt: null,
        elapsed: expect.any(Number),
      }),
      expect.anything(),
    );
  });

  it('Reset returns display to 00:00 and persists state=stopped with elapsed=0 laps=[]', async () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.start/i }));
    });

    await act(async () => {
      vi.advanceTimersByTime(1500);
    });

    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.reset/i }));
    });

    expect(screen.getByTestId('stopwatch-display')).toHaveTextContent('00:00');
    expect(updateWidgetConfig).toHaveBeenLastCalledWith(
      'sw-1',
      expect.objectContaining({
        state: 'stopped',
        startedAt: null,
        elapsed: 0,
        laps: [],
      }),
      expect.anything(),
    );
  });

  it('Lap while running appends elapsed to laps list', async () => {
    render(<StopwatchWidget instanceId="sw-1" config={{}} isEditMode={false} />);

    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.start/i }));
    });

    await act(async () => {
      vi.advanceTimersByTime(1000);
    });

    await act(async () => {
      fireEvent.click(screen.getByRole('button', { name: /stopwatch\.lap/i }));
    });

    // At least one lap entry visible
    expect(updateWidgetConfig).toHaveBeenLastCalledWith(
      'sw-1',
      expect.objectContaining({
        laps: expect.arrayContaining([expect.any(Number)]),
      }),
      expect.anything(),
    );

    // Lap entry rendered in the DOM
    const lapItems = screen.getAllByRole('listitem');
    expect(lapItems.length).toBeGreaterThanOrEqual(1);
  });

  it('reload reconstruction: renders ~7000ms elapsed from config with startedAt 5s ago', async () => {
    // Fix system time so Date.now() is deterministic
    const fixedNow = new Date('2026-07-01T12:00:00.000Z');
    vi.setSystemTime(fixedNow);

    // startedAt is 5 seconds before fixedNow
    const startedAt = new Date(fixedNow.getTime() - 5000).toISOString();

    // Render with a running config: 2000ms already accumulated + 5s since startedAt = ~7000ms total
    render(
      <StopwatchWidget
        instanceId="sw-reload"
        config={{
          state: 'running',
          startedAt,
          elapsed: 2000,
          laps: [],
        }}
        isEditMode={false}
      />,
    );

    // Tick the interval once
    await act(async () => {
      vi.advanceTimersByTime(100);
    });

    const display = screen.getByTestId('stopwatch-display').textContent ?? '';
    // 7000ms = 7 seconds → should show 00:07
    // More precisely: display must not show 00:00, 00:01, or 00:02 (which would ignore startedAt)
    // Accept any display > 5s
    const parts = display.split(':');
    const seconds = parseInt(parts[parts.length - 1] ?? '0', 10);
    const minutes = parseInt(parts[parts.length - 2] ?? '0', 10);
    const totalSeconds = minutes * 60 + seconds;
    expect(totalSeconds).toBeGreaterThanOrEqual(5);
  });

  it('quick-260916-bwo: die Anzeige skaliert per Container-Query-Klasse, keine Fensterbreiten-Formel im Style', () => {
    render(<StopwatchWidget instanceId="sw-cq" config={{}} isEditMode={false} />);

    const display = screen.getByTestId('stopwatch-display');
    expect(display.className).toMatch(/cqw/);
    expect(display.className).toMatch(/cqh/);
    expect(display.style.fontSize).toBe('');
  });
});