Fix blockquote persistence architecture

src/components/BlockquoteCopyButton.test.tsx

@@ -0,0 +1,201 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import BlockquoteCopyButton from './BlockquoteCopyButton';
+
+// Mock clipboard API
+const mockWriteText = vi.fn();
+Object.assign(navigator, {
+  clipboard: {
+    writeText: mockWriteText,
+  },
+});
+
+// Mock console methods
+const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+
+describe('BlockquoteCopyButton', () => {
+  let mockBlockquoteElement: HTMLElement;
+
+  beforeEach(() => {
+    // Create a mock blockquote element
+    mockBlockquoteElement = document.createElement('blockquote');
+    mockBlockquoteElement.innerHTML = '<p>Test content</p>';
+    document.body.appendChild(mockBlockquoteElement);
+
+    // Reset mocks
+    mockWriteText.mockClear();
+    consoleSpy.mockClear();
+  });
+
+  afterEach(() => {
+    // Clean up
+    document.body.removeChild(mockBlockquoteElement);
+    vi.clearAllTimers();
+  });
+
+  it('renders with default "Copy" text', () => {
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    expect(screen.getByRole('button')).toHaveTextContent('Copy');
+    expect(screen.getByRole('button')).toHaveAttribute('aria-label', 'Copy blockquote content');
+  });
+
+  it('copies text content when clicked', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    fireEvent.click(screen.getByRole('button'));
+
+    await waitFor(() => {
+      expect(mockWriteText).toHaveBeenCalledWith('Test content');
+    });
+  });
+
+  it('copies markdown content when contentType is text/markdown', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+    mockBlockquoteElement.innerHTML = '<p><strong>Bold text</strong> and <em>italic text</em></p>';
+
+    render(
+      <BlockquoteCopyButton 
+        blockquoteElement={mockBlockquoteElement} 
+        contentType="text/markdown" 
+      />
+    );
+
+    fireEvent.click(screen.getByRole('button'));
+
+    await waitFor(() => {
+      expect(mockWriteText).toHaveBeenCalledWith('**Bold text** and *italic text*');
+    });
+  });
+
+  it('shows "Copied!" feedback after successful copy', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    fireEvent.click(button);
+
+    // Wait for the state to change to "Copied!"
+    await waitFor(() => {
+      expect(button).toHaveTextContent('Copied!');
+      expect(button).toHaveClass('copied');
+    }, { timeout: 1000 });
+
+    expect(mockWriteText).toHaveBeenCalledWith('Test content');
+  });
+
+  it('shows "Error" feedback when copy fails', async () => {
+    const error = new Error('Clipboard not available');
+    mockWriteText.mockRejectedValueOnce(error);
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    fireEvent.click(button);
+
+    // Wait for the state to change to "Error"
+    await waitFor(() => {
+      expect(button).toHaveTextContent('Error');
+      expect(button).toHaveClass('error');
+    }, { timeout: 1000 });
+
+    expect(consoleSpy).toHaveBeenCalledWith('Failed to copy text: ', error);
+    expect(mockWriteText).toHaveBeenCalledWith('Test content');
+  });
+
+  it('removes existing copy buttons from cloned content', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+
+    // Add a copy button to the mock blockquote
+    const existingButton = document.createElement('button');
+    existingButton.className = 'blockquote-copy-button';
+    existingButton.textContent = 'Copy';
+    mockBlockquoteElement.appendChild(existingButton);
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    // Get all buttons and click the React-rendered one (should be the one with aria-label)
+    const reactButton = screen.getByLabelText('Copy blockquote content');
+    fireEvent.click(reactButton);
+
+    await waitFor(() => {
+      // Should copy only the text content, not including the button text
+      expect(mockWriteText).toHaveBeenCalledWith('Test content');
+    }, { timeout: 1000 });
+  });
+
+  it('prevents event propagation and default behavior', () => {
+    const mockEvent = {
+      preventDefault: vi.fn(),
+      stopPropagation: vi.fn(),
+      target: document.createElement('button'),
+    };
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    fireEvent.click(button, mockEvent);
+
+    // Note: This test verifies the click handler exists and works
+    // The actual preventDefault/stopPropagation calls are tested indirectly
+    expect(button).toBeInTheDocument();
+  });
+
+  it('handles empty blockquote content', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+    mockBlockquoteElement.innerHTML = '';
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    fireEvent.click(button);
+
+    await vi.waitFor(() => expect(mockWriteText).toHaveBeenCalled());
+
+    expect(mockWriteText).toHaveBeenCalledWith('');
+  });
+
+  it('trims whitespace from copied content', async () => {
+    mockWriteText.mockResolvedValueOnce(undefined);
+    mockBlockquoteElement.innerHTML = '  <p>  Test content  </p>  ';
+
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    fireEvent.click(button);
+
+    await vi.waitFor(() => expect(mockWriteText).toHaveBeenCalled());
+
+    expect(mockWriteText).toHaveBeenCalledWith('Test content');
+  });
+
+  it('has correct accessibility attributes', () => {
+    render(
+      <BlockquoteCopyButton blockquoteElement={mockBlockquoteElement} />
+    );
+
+    const button = screen.getByRole('button');
+    expect(button).toHaveAttribute('type', 'button');
+    expect(button).toHaveAttribute('aria-label', 'Copy blockquote content');
+  });
+});

src/components/BlockquoteCopyButton.tsx

@@ -0,0 +1,82 @@
+import React, { useState } from 'react';
+import TurndownService from 'turndown';
+
+interface BlockquoteCopyButtonProps {
+  blockquoteElement: HTMLElement;
+  contentType?: string;
+}
+
+const BlockquoteCopyButton: React.FC<BlockquoteCopyButtonProps> = ({
+  blockquoteElement,
+  contentType
+}) => {
+  const [buttonState, setButtonState] = useState<'default' | 'copied' | 'error'>('default');
+
+  // Create TurndownService instance
+  const turndownService = new TurndownService({ headingStyle: 'atx', emDelimiter: '*' });
+
+  const handleCopyClick = async (event: React.MouseEvent<HTMLButtonElement>) => {
+    event.preventDefault();
+    event.stopPropagation();
+
+    try {
+      // Clone the blockquote to avoid modifying the live DOM
+      const clonedBlockquote = blockquoteElement.cloneNode(true) as HTMLElement;
+
+      // Remove any existing copy buttons from the clone
+      const buttonsInClone = clonedBlockquote.querySelectorAll('.blockquote-copy-button');
+      buttonsInClone.forEach(button => button.remove());
+
+      let textToCopy: string;
+
+      // Check if the content type is markdown
+      if (contentType === 'text/markdown') {
+        // Get the inner HTML of the clone (without the button)
+        const htmlContent = clonedBlockquote.innerHTML;
+        // Convert HTML to Markdown using Turndown
+        textToCopy = turndownService.turndown(htmlContent);
+      } else {
+        // Default behavior: Get text content from the clone
+        textToCopy = clonedBlockquote.textContent || '';
+      }
+
+      await navigator.clipboard.writeText(textToCopy.trim());
+
+      // Visual feedback: Change to copied state
+      setButtonState('copied');
+      setTimeout(() => {
+        setButtonState('default');
+      }, 1500);
+
+    } catch (err) {
+      console.error('Failed to copy text: ', err);
+
+      // Error feedback
+      setButtonState('error');
+      setTimeout(() => {
+        setButtonState('default');
+      }, 1500);
+    }
+  };
+
+  const getButtonText = () => {
+    switch (buttonState) {
+      case 'copied': return 'Copied!';
+      case 'error': return 'Error';
+      default: return 'Copy';
+    }
+  };
+
+  return (
+    <button
+      className={`blockquote-copy-button ${buttonState !== 'default' ? buttonState : ''}`}
+      onClick={handleCopyClick}
+      type="button"
+      aria-label="Copy blockquote content"
+    >
+      {getButtonText()}
+    </button>
+  );
+};
+
+export default BlockquoteCopyButton;