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// Licensed under the Apache License, Version 2.0 (the "License");
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//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========

// Comprehensive unit tests for SearchInput component
import { fireEvent, render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { useState } from 'react';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import SearchInput from '../../../src/components/SearchInput/index';

// Mock the Input component from ui (matching relative import in component)
vi.mock('../../../src/components/ui/input', () => ({
  Input: vi.fn().mockImplementation((props) => {
    const { leadingIcon, ...restProps } = props;
    return (
      <div className="relative w-full">
        {leadingIcon && (
          <div className="leading-icon-wrapper">{leadingIcon}</div>
        )}
        <input {...restProps} />
      </div>
    );
  }),
}));

// Mock lucide-react
vi.mock('lucide-react', () => ({
  Search: vi
    .fn()
    .mockImplementation((props) => (
      <div data-testid="search-icon" {...props} />
    )),
}));

// Mock i18next
vi.mock('react-i18next', () => ({
  useTranslation: () => ({
    t: (key: string) => {
      if (key === 'setting.search-mcp') return 'Search MCPs';
      return key;
    },
  }),
}));

describe('SearchInput Component', () => {
  const defaultProps = {
    value: '',
    onChange: vi.fn(),
  };

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

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

  describe('Initial Render', () => {
    it('should render input field', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      expect(input).toBeInTheDocument();
    });

    it('should render with empty value initially', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      expect(input).toHaveValue('');
    });

    it('should render with provided value', () => {
      render(<SearchInput {...defaultProps} value="test search" />);

      const input = screen.getByRole('textbox');
      expect(input).toHaveValue('test search');
    });

    it('should render search icon', () => {
      render(<SearchInput {...defaultProps} />);

      const searchIcons = screen.getAllByTestId('search-icon');
      expect(searchIcons.length).toBeGreaterThan(0);
    });
  });

  describe('Placeholder Behavior', () => {
    it('should have placeholder attribute', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByPlaceholderText('Search MCPs');
      expect(input).toBeInTheDocument();
    });

    it('should show placeholder when value is empty', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByPlaceholderText('Search MCPs');
      expect(input).toHaveValue('');
    });

    it('should not show placeholder text when input has value', () => {
      render(<SearchInput {...defaultProps} value="search term" />);

      const input = screen.getByRole('textbox') as HTMLInputElement;
      expect(input.value).toBe('search term');
    });

    it('should maintain placeholder after focus and blur when empty', async () => {
      const user = userEvent.setup();
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');

      // Focus the input
      await user.click(input);

      // Blur the input
      await user.tab();

      // Placeholder should still be present
      expect(screen.getByPlaceholderText('Search MCPs')).toBeInTheDocument();
    });
  });

  describe('Focus States', () => {
    it('should handle focus event', async () => {
      const user = userEvent.setup();
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      await user.click(input);

      expect(input).toHaveFocus();
    });

    it('should handle blur event', async () => {
      const user = userEvent.setup();
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      await user.click(input);
      await user.tab();

      expect(input).not.toHaveFocus();
    });

    it('should accept text input when focused', async () => {
      const user = userEvent.setup();
      const mockOnChange = vi.fn();
      render(<SearchInput value="" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');
      await user.click(input);
      await user.keyboard('test');

      expect(mockOnChange).toHaveBeenCalled();
    });
  });

  describe('Input Handling', () => {
    it('should call onChange when input value changes', async () => {
      const user = userEvent.setup();
      // Use a controlled wrapper so typing updates the input's value reliably in tests
      const Controlled = () => {
        const [val, setVal] = useState('');
        return (
          <SearchInput
            value={val}
            onChange={(e: any) => setVal(e.target.value)}
          />
        );
      };

      render(<Controlled />);

      const input = screen.getByRole('textbox') as HTMLInputElement;
      await user.type(input, 'test');

      // The DOM input should now contain 'test'
      expect(input.value).toBe('test');
    });

    it('should handle backspace correctly', async () => {
      const user = userEvent.setup();
      // Controlled instance to reflect backspace in DOM
      const Controlled = () => {
        const [val, setVal] = useState('test');
        return (
          <SearchInput
            value={val}
            onChange={(e: any) => setVal(e.target.value)}
          />
        );
      };

      render(<Controlled />);

      const input = screen.getByRole('textbox') as HTMLInputElement;
      await user.click(input);
      await user.keyboard('{Backspace}');

      // The DOM input should have one less character
      expect(input.value).toBe('tes');
    });

    it('should handle clear input', async () => {
      const user = userEvent.setup();
      const Controlled = () => {
        const [val, setVal] = useState('test');
        return (
          <SearchInput
            value={val}
            onChange={(e: any) => setVal(e.target.value)}
          />
        );
      };

      render(<Controlled />);

      const input = screen.getByRole('textbox') as HTMLInputElement;
      await user.clear(input);

      expect(input.value).toBe('');
    });
  });

  describe('Icon Positioning', () => {
    it('should render search icon in component', () => {
      render(<SearchInput {...defaultProps} />);

      const searchIcon = screen.getByTestId('search-icon');
      expect(searchIcon).toBeInTheDocument();
    });

    it('should include leading icon when value is empty', () => {
      render(<SearchInput {...defaultProps} />);

      // The component should render with a leading icon
      const iconWrapper = document.querySelector('.leading-icon-wrapper');
      expect(iconWrapper).toBeInTheDocument();
    });

    it('should include leading icon when input has value', () => {
      render(<SearchInput {...defaultProps} value="test" />);

      // The component should render with a leading icon
      const iconWrapper = document.querySelector('.leading-icon-wrapper');
      expect(iconWrapper).toBeInTheDocument();
    });
  });

  describe('Styling and Classes', () => {
    it('should render within a container with relative positioning', () => {
      render(<SearchInput {...defaultProps} />);

      const container = screen.getByRole('textbox').parentElement;
      expect(container).toHaveClass('relative', 'w-full');
    });

    it('should apply placeholder to input', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      expect(input).toHaveAttribute('placeholder', 'Search MCPs');
    });

    it('should render search icon component', () => {
      render(<SearchInput {...defaultProps} />);

      const searchIcon = screen.getByTestId('search-icon');
      expect(searchIcon).toBeInTheDocument();
    });
  });

  describe('Keyboard Navigation', () => {
    it('should handle Tab key for navigation', async () => {
      const user = userEvent.setup();
      render(
        <div>
          <SearchInput {...defaultProps} />
          <button>Next Element</button>
        </div>
      );

      const input = screen.getByRole('textbox');
      const button = screen.getByRole('button');

      await user.click(input);
      expect(input).toHaveFocus();

      await user.tab();
      expect(button).toHaveFocus();
    });

    it('should handle Shift+Tab for reverse navigation', async () => {
      const user = userEvent.setup();
      render(
        <div>
          <button>Previous Element</button>
          <SearchInput {...defaultProps} />
        </div>
      );

      const input = screen.getByRole('textbox');
      const button = screen.getByRole('button');

      await user.click(input);
      expect(input).toHaveFocus();

      await user.keyboard('{Shift>}{Tab}{/Shift}');
      expect(button).toHaveFocus();
    });

    it('should handle Enter key', async () => {
      const user = userEvent.setup();
      const mockOnChange = vi.fn();

      render(<SearchInput value="test" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');
      await user.click(input);
      await user.keyboard('{Enter}');

      // Enter key should not change the value
      expect(mockOnChange).not.toHaveBeenCalledWith(
        expect.objectContaining({
          target: expect.objectContaining({
            value: expect.stringContaining('\n'),
          }),
        })
      );
    });

    it('should handle Escape key', async () => {
      const user = userEvent.setup();
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      await user.click(input);

      expect(input).toHaveFocus();

      await user.keyboard('{Escape}');

      // Component doesn't implement Escape key handling, so focus remains
      // This is expected behavior for a simple search input
      expect(input).toHaveFocus();
    });
  });

  describe('Accessibility', () => {
    it('should have proper role attribute', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      expect(input).toBeInTheDocument();
    });

    it('should be focusable', async () => {
      const user = userEvent.setup();
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');
      await user.tab();

      expect(input).toHaveFocus();
    });

    it('should handle screen reader accessibility', () => {
      render(<SearchInput {...defaultProps} />);

      const input = screen.getByRole('textbox');

      // Should be accessible to screen readers
      expect(input).toBeVisible();
      expect(input).not.toHaveAttribute('aria-hidden', 'true');
    });
  });

  describe('Edge Cases', () => {
    it('should handle very long input values', async () => {
      const user = userEvent.setup();
      const longValue = 'a'.repeat(1000);
      const mockOnChange = vi.fn();

      render(<SearchInput value="" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');
      await user.type(input, longValue);

      expect(mockOnChange).toHaveBeenCalledTimes(1000);
    });

    it('should handle special characters', async () => {
      const _user = userEvent.setup();
      const specialChars = '!@#$%^&*()_+-=[]{}|;:,.<>?';
      const mockOnChange = vi.fn();

      render(<SearchInput value="" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');
      // Send each character as an input change to avoid user-event parsing of bracket sequences
      for (const ch of specialChars) {
        const newVal = (input as HTMLInputElement).value + ch;
        fireEvent.change(input, { target: { value: newVal } });
      }

      expect(mockOnChange).toHaveBeenCalledTimes(specialChars.length);
    });

    it('should handle unicode characters', async () => {
      const user = userEvent.setup();
      const unicodeText = '测试 🚀 العربية';
      const mockOnChange = vi.fn();

      render(<SearchInput value="" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');
      await user.type(input, unicodeText);

      expect(mockOnChange).toHaveBeenCalled();
    });

    it('should handle rapid typing', async () => {
      const user = userEvent.setup();
      const mockOnChange = vi.fn();

      render(<SearchInput value="" onChange={mockOnChange} />);

      const input = screen.getByRole('textbox');

      // Type multiple characters quickly
      await user.type(input, 'quick', { delay: 1 });

      expect(mockOnChange).toHaveBeenCalledTimes(5); // 'q', 'u', 'i', 'c', 'k'
    });
  });

  describe('Component State Management', () => {
    it('should handle value changes correctly', async () => {
      const user = userEvent.setup();
      const Controlled = () => {
        const [val, setVal] = useState('');
        return (
          <SearchInput
            value={val}
            onChange={(e: any) => setVal(e.target.value)}
          />
        );
      };

      render(<Controlled />);

      const input = screen.getByRole('textbox');

      // Type text
      await user.type(input, 'test');

      expect((input as HTMLInputElement).value).toBe('test');
    });

    it('should handle rapid value changes', async () => {
      const user = userEvent.setup();
      const Controlled = () => {
        const [val, setVal] = useState('');
        return (
          <SearchInput
            value={val}
            onChange={(e: any) => setVal(e.target.value)}
          />
        );
      };

      render(<Controlled />);

      const input = screen.getByRole('textbox') as HTMLInputElement;

      // Rapid focus and type
      await user.click(input);
      await user.keyboard('quick');

      expect(input.value).toBe('quick');
    });
  });

  describe('Props Validation', () => {
    it('should handle missing onChange prop gracefully', () => {
      const consoleErrorSpy = vi
        .spyOn(console, 'error')
        .mockImplementation(() => {});

      expect(() => {
        render(<SearchInput value="" onChange={undefined as any} />);
      }).not.toThrow();

      consoleErrorSpy.mockRestore();
    });

    it('should handle null value prop', () => {
      render(<SearchInput value={null as any} onChange={vi.fn()} />);

      const input = screen.getByRole('textbox');
      expect(input).toHaveValue('');
    });

    it('should handle undefined value prop', () => {
      render(<SearchInput value={undefined as any} onChange={vi.fn()} />);

      const input = screen.getByRole('textbox');
      expect(input).toHaveValue('');
    });
  });
});