import { renderHook, act, waitFor } from '@testing-library/react';
import { useFormAutosave } from './use-form-autosave';

describe('useFormAutosave', () => {
  const mockKey = 'test_form';
  const mockInitialData = { name: '', email: '' };

  beforeEach(() => {
    localStorage.clear();
    jest.clearAllMocks();
    jest.useFakeTimers();
  });

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

  it('should initialize with initial data', () => {
    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
      })
    );

    expect(result.current.data).toEqual(mockInitialData);
    expect(result.current.lastSaved).toBeNull();
    expect(result.current.isRestored).toBe(false);
  });

  it('should restore data from localStorage', () => {
    const savedData = {
      data: { name: 'John', email: 'john@example.com' },
      timestamp: new Date().toISOString(),
    };
    localStorage.setItem(`form_autosave_${mockKey}`, JSON.stringify(savedData));

    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
      })
    );

    expect(result.current.data).toEqual(savedData.data);
    expect(result.current.isRestored).toBe(true);
  });

  it('should not restore expired data', () => {
    const expiredData = {
      data: { name: 'John', email: 'john@example.com' },
      timestamp: new Date(Date.now() - 25 * 60 * 60 * 1000).toISOString(), // 25 hours ago
    };
    localStorage.setItem(`form_autosave_${mockKey}`, JSON.stringify(expiredData));

    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
        maxAge: 24 * 60 * 60 * 1000, // 24 hours
      })
    );

    expect(result.current.data).toEqual(mockInitialData);
    expect(result.current.isRestored).toBe(false);
  });

  it('should update data and auto-save after debounce', async () => {
    const onSave = jest.fn();
    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
        onSave,
        debounceMs: 1000,
      })
    );

    act(() => {
      result.current.updateData({ name: 'John' });
    });

    expect(result.current.data.name).toBe('John');
    expect(result.current.lastSaved).toBeNull();

    act(() => {
      jest.advanceTimersByTime(1000);
    });

    await waitFor(() => {
      expect(result.current.lastSaved).not.toBeNull();
    });

    expect(onSave).toHaveBeenCalledWith({ name: 'John', email: '' });
  });

  it('should clear saved data', () => {
    const savedData = {
      data: { name: 'John', email: 'john@example.com' },
      timestamp: new Date().toISOString(),
    };
    localStorage.setItem(`form_autosave_${mockKey}`, JSON.stringify(savedData));

    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
      })
    );

    act(() => {
      result.current.clearSavedData();
    });

    expect(result.current.data).toEqual(mockInitialData);
    expect(result.current.lastSaved).toBeNull();
    expect(result.current.isRestored).toBe(false);
    expect(localStorage.getItem(`form_autosave_${mockKey}`)).toBeNull();
  });

  it('should save immediately when called', async () => {
    const onSave = jest.fn();
    const { result } = renderHook(() =>
      useFormAutosave({
        key: mockKey,
        initialData: mockInitialData,
        onSave,
        debounceMs: 5000,
      })
    );

    act(() => {
      result.current.updateData({ name: 'John' });
    });

    // 等待状态更新
    await waitFor(() => {
      expect(result.current.data.name).toBe('John');
    });

    act(() => {
      result.current.saveImmediately();
    });

    await waitFor(() => {
      expect(onSave).toHaveBeenCalledWith({ name: 'John', email: '' });
    });
    expect(result.current.lastSaved).not.toBeNull();
  });
});