import React from 'react';
import { render, screen, fireEvent, waitFor } from '@testing-library/react';
import '@testing-library/jest-dom';
import AvatarDropdown from '../AvatarDropdown';
import { User, UserRole } from '../../../types';
import { AccountStatus } from '../../../services/auth/auth.constants';

const mockRegularUser: User = {
  _id: '1',
  _rev: '1-abc123',
  username: 'John Doe',
  email: 'john@example.com',
  role: UserRole.USER,
  status: AccountStatus.ACTIVE,
  createdAt: new Date(),
};

const mockAdminUser: User = {
  _id: '2',
  _rev: '1-def456',
  username: 'Admin User',
  email: 'admin@example.com',
  role: UserRole.ADMIN,
  status: AccountStatus.ACTIVE,
  createdAt: new Date(),
};

const mockUserWithAvatar: User = {
  ...mockRegularUser,
  avatar: 'https://example.com/avatar.jpg',
};

const mockUserWithPassword: User = {
  ...mockRegularUser,
  password: '$2b$12$examplehashforpassword',
};

type DropdownProps = Partial<React.ComponentProps<typeof AvatarDropdown>>;

const renderDropdown = (props: DropdownProps = {}) => {
  const defaultProps: React.ComponentProps<typeof AvatarDropdown> = {
    user: mockRegularUser,
    onLogout: jest.fn(),
  };

  const merged = { ...defaultProps, ...props };
  return render(React.createElement(AvatarDropdown, merged));
};

describe('AvatarDropdown', () => {
  const mockOnLogout = jest.fn();
  const mockOnAdmin = jest.fn();
  const mockOnChangePassword = jest.fn();

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

  describe('rendering', () => {
    test('should render avatar button with user initials', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toBeInTheDocument();
      expect(button).toHaveTextContent('J');
    });

    test('should render avatar image when user has avatar', () => {
      renderDropdown({ user: mockUserWithAvatar, onLogout: mockOnLogout });

      const avatar = screen.getByAltText('User avatar');
      expect(avatar).toBeInTheDocument();
      expect(avatar).toHaveAttribute('src', 'https://example.com/avatar.jpg');
    });

    test('should render fallback character for empty username', () => {
      const userWithEmptyName = { ...mockRegularUser, username: '' };
      renderDropdown({ user: userWithEmptyName, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toHaveTextContent('?');
    });

    test('should not render dropdown menu initially', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      expect(screen.queryByText('Signed in as')).not.toBeInTheDocument();
    });
  });

  describe('dropdown functionality', () => {
    test('should open dropdown when avatar button is clicked', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      fireEvent.click(button);

      expect(screen.getByText('Signed in as')).toBeInTheDocument();
      expect(screen.getByText('John Doe')).toBeInTheDocument();
    });

    test('should close dropdown when avatar button is clicked again', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });

      fireEvent.click(button);
      expect(screen.getByText('Signed in as')).toBeInTheDocument();

      fireEvent.click(button);
      expect(screen.queryByText('Signed in as')).not.toBeInTheDocument();
    });

    test('should close dropdown when clicking outside', async () => {
      render(
        React.createElement(
          'div',
          null,
          React.createElement(AvatarDropdown, {
            user: mockRegularUser,
            onLogout: mockOnLogout,
          }),
          React.createElement(
            'div',
            { 'data-testid': 'outside' },
            'Outside element'
          )
        )
      );

      const button = screen.getByRole('button', { name: /user menu/i });
      const outside = screen.getByTestId('outside');

      fireEvent.click(button);
      expect(screen.getByText('Signed in as')).toBeInTheDocument();

      fireEvent.mouseDown(outside);

      await waitFor(() => {
        expect(screen.queryByText('Signed in as')).not.toBeInTheDocument();
      });
    });
  });

  describe('user information display', () => {
    test('should display username in dropdown', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.getByText('John Doe')).toBeInTheDocument();
    });

    test('should display administrator badge for admin users', () => {
      renderDropdown({ user: mockAdminUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.getByText('Administrator')).toBeInTheDocument();
    });

    test('should not display administrator badge for regular users', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.queryByText('Administrator')).not.toBeInTheDocument();
    });

    test('should truncate long usernames', () => {
      const userWithLongName = {
        ...mockRegularUser,
        username: 'Very Long Username That Should Be Truncated',
      };

      renderDropdown({ user: userWithLongName, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      const usernameElement = screen.getByText(
        'Very Long Username That Should Be Truncated'
      );
      expect(usernameElement).toHaveClass('truncate');
    });
  });

  describe('logout functionality', () => {
    test('should call onLogout when logout button is clicked', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      fireEvent.click(screen.getByText('Logout'));

      expect(mockOnLogout).toHaveBeenCalledTimes(1);
    });

    test('should close dropdown after logout is clicked', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      fireEvent.click(screen.getByText('Logout'));

      expect(screen.queryByText('Signed in as')).not.toBeInTheDocument();
    });

    test('should always display logout button', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.getByText('Logout')).toBeInTheDocument();
    });
  });

  describe('admin functionality', () => {
    test('should render Admin Interface button for admin users', () => {
      renderDropdown({
        user: mockAdminUser,
        onLogout: mockOnLogout,
        onAdmin: mockOnAdmin,
      });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      const adminButton = screen.getByText('Admin Interface');
      expect(adminButton).toBeInTheDocument();

      fireEvent.click(adminButton);
      expect(mockOnAdmin).toHaveBeenCalledTimes(1);
    });

    test('should not render Admin Interface button for regular users', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.queryByText('Admin Interface')).not.toBeInTheDocument();
    });
  });

  describe('change password visibility', () => {
    test('should show change password option when user has password', () => {
      renderDropdown({
        user: mockUserWithPassword,
        onLogout: mockOnLogout,
        onChangePassword: mockOnChangePassword,
      });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.getByText('Change Password')).toBeInTheDocument();
    });

    test('should hide change password option when user has no password', () => {
      renderDropdown({
        user: mockRegularUser,
        onLogout: mockOnLogout,
        onChangePassword: mockOnChangePassword,
      });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      expect(screen.queryByText('Change Password')).not.toBeInTheDocument();
    });

    test('should call onChangePassword when change password button clicked', () => {
      renderDropdown({
        user: mockUserWithPassword,
        onLogout: mockOnLogout,
        onChangePassword: mockOnChangePassword,
      });

      fireEvent.click(screen.getByRole('button', { name: /user menu/i }));
      fireEvent.click(screen.getByText('Change Password'));
      expect(mockOnChangePassword).toHaveBeenCalledTimes(1);
    });
  });

  describe('keyboard accessibility', () => {
    test('should toggle dropdown with Enter key', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      fireEvent.keyDown(button, { key: 'Enter', code: 'Enter' });
      fireEvent.keyUp(button, { key: 'Enter', code: 'Enter' });
      expect(screen.getByText('Signed in as')).toBeInTheDocument();
    });

    test('should not toggle dropdown with unrelated key', () => {
      renderDropdown({ user: mockRegularUser, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      fireEvent.keyDown(button, { key: 'Space', code: 'Space' });
      expect(screen.queryByText('Signed in as')).not.toBeInTheDocument();
    });
  });

  describe('user initials generation', () => {
    test('should handle lowercase usernames', () => {
      const userWithLowercase = { ...mockRegularUser, username: 'john' };
      renderDropdown({ user: userWithLowercase, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toHaveTextContent('J');
    });

    test('should handle empty username gracefully', () => {
      const userWithEmptyName = { ...mockRegularUser, username: '' };
      renderDropdown({ user: userWithEmptyName, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toHaveTextContent('?');
    });

    test('should handle single character username', () => {
      const userWithSingleChar = { ...mockRegularUser, username: 'a' };
      renderDropdown({ user: userWithSingleChar, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toHaveTextContent('A');
    });

    test('should handle usernames with special characters', () => {
      const userWithSpecialChar = { ...mockRegularUser, username: '!john' };
      renderDropdown({ user: userWithSpecialChar, onLogout: mockOnLogout });

      const button = screen.getByRole('button', { name: /user menu/i });
      expect(button).toHaveTextContent('!');
    });
  });
});