import { renderHook, act } from '@testing-library/react';
import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { useLocalStorage } from './useLocalStorage';

// Mock the error handling utility
vi.mock('../utils/errorHandling', () => ({
  handleError: vi.fn()
}));

// Mock localStorage
const localStorageMock = (() => {
  let store: Record<string, string> = {};

  return {
    getItem: (key: string) => store[key] || null,
    setItem: (key: string, value: string) => {
      store[key] = value.toString();
    },
    removeItem: (key: string) => {
      delete store[key];
    },
    clear: () => {
      store = {};
    }
  };
})();

describe('useLocalStorage', () => {
  beforeEach(() => {
    // Setup localStorage mock
    Object.defineProperty(window, 'localStorage', {
      value: localStorageMock,
      writable: true
    });
    localStorageMock.clear();
  });

  afterEach(() => {
    vi.clearAllMocks();
  });

  it('should return initial value when localStorage is empty', () => {
    const { result } = renderHook(() => useLocalStorage('test-key', 'initial-value'));
    const [value] = result.current;

    expect(value).toBe('initial-value');
  });

  it('should return initial value from function when localStorage is empty', () => {
    const initializer = vi.fn(() => 'computed-value');
    const { result } = renderHook(() => useLocalStorage('test-key', initializer));
    const [value] = result.current;

    expect(value).toBe('computed-value');
    expect(initializer).toHaveBeenCalled();
  });

  it('should set value in localStorage', () => {
    const { result } = renderHook(() => useLocalStorage('test-key', 'initial'));

    act(() => {
      const [, setValue] = result.current;
      setValue('new-value');
    });

    const [value] = result.current;
    expect(value).toBe('new-value');
    expect(JSON.parse(localStorage.getItem('test-key')!)).toBe('new-value');
  });

  it('should handle updater function in setValue', () => {
    const { result } = renderHook(() => useLocalStorage('test-key', 10));

    act(() => {
      const [, setValue] = result.current;
      setValue((prev) => prev + 5);
    });

    const [value] = result.current;
    expect(value).toBe(15);
  });

  it('should read existing value from localStorage', () => {
    localStorage.setItem('test-key', JSON.stringify('existing-value'));

    const { result } = renderHook(() => useLocalStorage('test-key', 'initial-value'));
    const [value] = result.current;

    expect(value).toBe('existing-value');
  });

  it('should handle complex objects', () => {
    const complexObject = { name: 'John', age: 30, hobbies: ['reading', 'coding'] };
    const { result } = renderHook(() => useLocalStorage('test-key', complexObject));

    act(() => {
      const [, setValue] = result.current;
      setValue({ ...complexObject, age: 31 });
    });

    const [value] = result.current;
    expect(value).toEqual({ name: 'John', age: 31, hobbies: ['reading', 'coding'] });
  });

  it('should remove value from localStorage', () => {
    localStorage.setItem('test-key', JSON.stringify('existing-value'));

    const { result } = renderHook(() => useLocalStorage('test-key', 'initial-value'));

    act(() => {
      const [, , removeValue] = result.current;
      removeValue();
    });

    const [value] = result.current;
    expect(value).toBe('initial-value');
    expect(localStorage.getItem('test-key')).toBeNull();
  });

  it('should handle invalid JSON in localStorage', () => {
    localStorage.setItem('test-key', 'invalid-json{');

    const { result } = renderHook(() => useLocalStorage('test-key', 'fallback-value'));
    const [value] = result.current;

    expect(value).toBe('fallback-value');
  });

  it('should be SSR-safe (no window)', () => {
    const originalWindow = global.window;
    // @ts-ignore - Temporarily remove window for SSR test
    delete global.window;

    const { result } = renderHook(() => useLocalStorage('test-key', 'ssr-value'));
    const [value] = result.current;

    expect(value).toBe('ssr-value');

    // Restore window
    global.window = originalWindow;
  });

  it('should handle localStorage quota exceeded', () => {
    const { handleError } = require('../utils/errorHandling');

    // Mock setItem to throw quota exceeded error
    const originalSetItem = localStorage.setItem;
    localStorage.setItem = vi.fn(() => {
      throw new DOMException('QuotaExceededError');
    });

    const { result } = renderHook(() => useLocalStorage('test-key', 'initial'));

    act(() => {
      const [, setValue] = result.current;
      setValue('new-value');
    });

    expect(handleError).toHaveBeenCalled();

    // Restore original setItem
    localStorage.setItem = originalSetItem;
  });

  it('should serialize and deserialize arrays', () => {
    const initialArray = [1, 2, 3, 4, 5];
    const { result } = renderHook(() => useLocalStorage('test-key', initialArray));

    act(() => {
      const [, setValue] = result.current;
      setValue([...initialArray, 6]);
    });

    const [value] = result.current;
    expect(value).toEqual([1, 2, 3, 4, 5, 6]);
    expect(JSON.parse(localStorage.getItem('test-key')!)).toEqual([1, 2, 3, 4, 5, 6]);
  });

  it('should handle boolean values', () => {
    const { result } = renderHook(() => useLocalStorage('test-key', false));

    act(() => {
      const [, setValue] = result.current;
      setValue(true);
    });

    const [value] = result.current;
    expect(value).toBe(true);
    expect(JSON.parse(localStorage.getItem('test-key')!)).toBe(true);
  });

  it('should handle number values', () => {
    const { result } = renderHook(() => useLocalStorage('test-key', 0));

    act(() => {
      const [, setValue] = result.current;
      setValue(42);
    });

    const [value] = result.current;
    expect(value).toBe(42);
    expect(JSON.parse(localStorage.getItem('test-key')!)).toBe(42);
  });

  it('should handle null values', () => {
    const { result } = renderHook(() => useLocalStorage<string | null>('test-key', null));

    const [value] = result.current;
    expect(value).toBe(null);
  });

  it('should update localStorage when key changes', () => {
    const { result, rerender } = renderHook(
      ({ key, value }) => useLocalStorage(key, value),
      { initialProps: { key: 'key1', value: 'value1' } }
    );

    act(() => {
      const [, setValue] = result.current;
      setValue('updated-value1');
    });

    expect(localStorage.getItem('key1')).toBe(JSON.stringify('updated-value1'));

    // Change the key
    rerender({ key: 'key2', value: 'value2' });

    act(() => {
      const [, setValue] = result.current;
      setValue('updated-value2');
    });

    expect(localStorage.getItem('key2')).toBe(JSON.stringify('updated-value2'));
  });
});