import {
  customElement,
  property,
  static as html,
  DeesElement,
  type TemplateResult,
  cssManager,
  css,
} from '@design.estate/dees-element';

import { type IBlock } from './wysiwyg.types.js';
import { WysiwygBlocks } from './wysiwyg.blocks.js';
import { WysiwygSelection } from './wysiwyg.selection.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-wysiwyg-block': DeesWysiwygBlock;
  }
}

@customElement('dees-wysiwyg-block')
export class DeesWysiwygBlock extends DeesElement {
  async disconnectedCallback() {
    await super.disconnectedCallback();
    // Clean up selection handler
    if ((this as any)._selectionHandler) {
      document.removeEventListener('selectionchange', (this as any)._selectionHandler);
    }
  }
  @property({ type: Object })
  public block: IBlock;

  @property({ type: Boolean })
  public isSelected: boolean = false;

  @property({ type: Object })
  public handlers: {
    onInput: (e: InputEvent) => void;
    onKeyDown: (e: KeyboardEvent) => void;
    onFocus: () => void;
    onBlur: () => void;
    onCompositionStart: () => void;
    onCompositionEnd: () => void;
    onMouseUp?: (e: MouseEvent) => void;
  };

  // Reference to the editable block element
  private blockElement: HTMLDivElement | null = null;
  
  // Track if we've initialized the content
  private contentInitialized: boolean = false;
  
  // Track cursor position
  private lastKnownCursorPosition: number = 0;
  private lastSelectedText: string = '';

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        display: block;
      }

      .block {
        padding: 4px 0;
        min-height: 1.6em;
        outline: none;
        width: 100%;
        word-wrap: break-word;
        position: relative;
        transition: all 0.15s ease;
        color: ${cssManager.bdTheme('#000000', '#e0e0e0')};
      }

      .block:empty:not(:focus)::before {
        content: attr(data-placeholder);
        color: ${cssManager.bdTheme('#999', '#666')};
        position: absolute;
        pointer-events: none;
      }

      .block.heading-1 {
        font-size: 32px;
        font-weight: 700;
        line-height: 1.2;
        margin: 24px 0 8px 0;
        color: ${cssManager.bdTheme('#000000', '#ffffff')};
      }

      .block.heading-2 {
        font-size: 24px;
        font-weight: 600;
        line-height: 1.3;
        margin: 20px 0 6px 0;
        color: ${cssManager.bdTheme('#000000', '#ffffff')};
      }

      .block.heading-3 {
        font-size: 20px;
        font-weight: 600;
        line-height: 1.4;
        margin: 16px 0 4px 0;
        color: ${cssManager.bdTheme('#000000', '#ffffff')};
      }

      .block.quote {
        border-left: 3px solid ${cssManager.bdTheme('#0066cc', '#4d94ff')};
        padding-left: 20px;
        color: ${cssManager.bdTheme('#555', '#b0b0b0')};
        font-style: italic;
        line-height: 1.6;
        margin: 16px 0;
      }

      .block.code {
        font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
        font-size: 14px;
        background: ${cssManager.bdTheme('#f8f8f8', '#0d0d0d')};
        border: 1px solid ${cssManager.bdTheme('#e0e0e0', '#2a2a2a')};
        padding: 16px 20px;
        padding-top: 32px;
        border-radius: 6px;
        white-space: pre-wrap;
        color: ${cssManager.bdTheme('#24292e', '#e1e4e8')};
        line-height: 1.5;
        overflow-x: auto;
        margin: 20px 0;
      }

      .block.list {
        padding: 0;
      }

      .block.list ul,
      .block.list ol {
        margin: 0;
        padding-left: 24px;
      }

      .block.list li {
        margin: 4px 0;
      }

      .block.divider {
        padding: 0;
        margin: 16px 0;
        pointer-events: none;
      }

      .block.divider hr {
        border: none;
        border-top: 1px solid ${cssManager.bdTheme('#e0e0e0', '#333')};
        margin: 0;
      }

      /* Formatting styles */
      .block :is(b, strong) {
        font-weight: 600;
        color: ${cssManager.bdTheme('#000000', '#ffffff')};
      }

      .block :is(i, em) {
        font-style: italic;
      }

      .block u {
        text-decoration: underline;
      }

      .block s {
        text-decoration: line-through;
      }

      .block code {
        font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
        font-size: 0.9em;
        background: ${cssManager.bdTheme('rgba(0, 0, 0, 0.06)', 'rgba(255, 255, 255, 0.1)')};
        padding: 2px 6px;
        border-radius: 3px;
        color: ${cssManager.bdTheme('#d14', '#ff6b6b')};
      }

      .block a {
        color: ${cssManager.bdTheme('#0066cc', '#4d94ff')};
        text-decoration: none;
        border-bottom: 1px solid transparent;
        transition: border-color 0.15s ease;
        cursor: pointer;
      }

      .block a:hover {
        border-bottom-color: ${cssManager.bdTheme('#0066cc', '#4d94ff')};
      }

      .code-language {
        position: absolute;
        top: 0;
        right: 0;
        background: ${cssManager.bdTheme('#e1e4e8', '#333333')};
        color: ${cssManager.bdTheme('#586069', '#8b949e')};
        padding: 4px 12px;
        font-size: 12px;
        border-radius: 0 6px 0 6px;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        text-transform: lowercase;
        z-index: 1;
      }

      .code-block-container {
        position: relative;
        margin: 20px 0;
      }

      /* Selection styles */
      .block ::selection {
        background: ${cssManager.bdTheme('rgba(0, 102, 204, 0.3)', 'rgba(77, 148, 255, 0.3)')};
        color: inherit;
      }

      /* Paragraph specific styles */
      .block.paragraph {
        font-size: 16px;
        line-height: 1.6;
        font-weight: 400;
      }

      /* Strike through */
      .block :is(s, strike) {
        text-decoration: line-through;
        opacity: 0.7;
      }

      /* List specific margin adjustments */
      .block.list li {
        margin-bottom: 8px;
        line-height: 1.6;
      }

      .block.list li:last-child {
        margin-bottom: 0;
      }

      /* Block margin adjustments based on type */
      :host-context(.block-wrapper:first-child) .block {
        margin-top: 0 !important;
      }

      :host-context(.block-wrapper:last-child) .block {
        margin-bottom: 0;
      }

      /* Selected state */
      .block.selected {
        background: ${cssManager.bdTheme('rgba(0, 102, 204, 0.05)', 'rgba(77, 148, 255, 0.08)')};
        box-shadow: inset 0 0 0 2px ${cssManager.bdTheme('rgba(0, 102, 204, 0.2)', 'rgba(77, 148, 255, 0.2)')};
        border-radius: 4px;
        margin-left: -8px;
        margin-right: -8px;
        padding-left: 8px;
        padding-right: 8px;
      }
    `,
  ];

  protected shouldUpdate(changedProperties: Map<string, any>): boolean {
    // Never update if only the block content changed
    if (changedProperties.has('block') && this.block) {
      const oldBlock = changedProperties.get('block');
      if (oldBlock && oldBlock.id === this.block.id && oldBlock.type === this.block.type) {
        // Only content or metadata changed, don't re-render
        return false;
      }
    }
    
    // Only update if the block type or id changes
    return !this.blockElement || this.block?.type !== this.blockElement.dataset.blockType;
  }
  
  public firstUpdated(): void {
    // Mark that content has been initialized
    this.contentInitialized = true;
    
    // First, populate the container with the rendered content
    const container = this.shadowRoot?.querySelector('.wysiwyg-block-container') as HTMLDivElement;
    if (container && this.block) {
      container.innerHTML = this.renderBlockContent();
    }
    
    // Now find the actual editable block element
    const editableBlock = this.block.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
    
    // Ensure the block element maintains its content
    if (editableBlock) {
      editableBlock.setAttribute('data-block-id', this.block.id);
      editableBlock.setAttribute('data-block-type', this.block.type);
      
      // Set up all event handlers manually to avoid Lit re-renders
      editableBlock.addEventListener('input', (e) => {
        this.handlers?.onInput?.(e as InputEvent);
        
        // Track cursor position after input
        const pos = this.getCursorPosition(editableBlock);
        if (pos !== null) {
          this.lastKnownCursorPosition = pos;
        }
      });
      
      editableBlock.addEventListener('keydown', (e) => {
        // Track cursor position before keydown
        const pos = this.getCursorPosition(editableBlock);
        if (pos !== null) {
          this.lastKnownCursorPosition = pos;
        }
        
        this.handlers?.onKeyDown?.(e);
      });
      
      
      editableBlock.addEventListener('focus', () => {
        this.handlers?.onFocus?.();
      });
      
      editableBlock.addEventListener('blur', () => {
        this.handlers?.onBlur?.();
      });
      
      editableBlock.addEventListener('compositionstart', () => {
        this.handlers?.onCompositionStart?.();
      });
      
      editableBlock.addEventListener('compositionend', () => {
        this.handlers?.onCompositionEnd?.();
      });
      
      editableBlock.addEventListener('mouseup', (e) => {
        const pos = this.getCursorPosition(editableBlock);
        if (pos !== null) {
          this.lastKnownCursorPosition = pos;
          console.log('Cursor position after mouseup:', pos);
        }
        
        // Selection will be handled by selectionchange event
        this.handlers?.onMouseUp?.(e);
      });
      
      editableBlock.addEventListener('click', (e: MouseEvent) => {
        // Small delay to let browser set cursor position
        setTimeout(() => {
          const pos = this.getCursorPosition(editableBlock);
          if (pos !== null) {
            this.lastKnownCursorPosition = pos;
            console.log('Cursor position after click:', pos);
          }
        }, 0);
      });
      
      // Add selection change handler
      const checkSelection = () => {
        const selection = window.getSelection();
        if (!selection || selection.rangeCount === 0) return;
        
        const selectedText = selection.toString();
        if (selectedText.length === 0) {
          // Clear selection if no text
          if (this.lastSelectedText) {
            this.lastSelectedText = '';
            this.dispatchEvent(new CustomEvent('block-text-selected', {
              detail: {
                text: '',
                blockId: this.block.id,
                hasSelection: false
              },
              bubbles: true,
              composed: true
            }));
          }
          return;
        }
        
        // Get fresh reference to the editable block
        const currentEditableBlock = this.block?.type === 'code' 
          ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
          : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
          
        if (!currentEditableBlock) return;
        
        // Get parent wysiwyg component's shadow root
        const parentComponent = this.closest('dees-input-wysiwyg');
        const parentShadowRoot = parentComponent?.shadowRoot;
        
        // Use getComposedRanges with shadow roots as per MDN docs
        const shadowRoots: ShadowRoot[] = [];
        if (parentShadowRoot) shadowRoots.push(parentShadowRoot);
        if (this.shadowRoot) shadowRoots.push(this.shadowRoot);
        
        // Get selection info using our Shadow DOM-aware utility
        const selectionInfo = WysiwygSelection.getSelectionInfo(...shadowRoots);
        if (!selectionInfo) return;
        
        // Check if selection is within this block
        const startInBlock = currentEditableBlock.contains(selectionInfo.startContainer);
        const endInBlock = currentEditableBlock.contains(selectionInfo.endContainer);
        
        if (startInBlock || endInBlock) {
          if (selectedText !== this.lastSelectedText) {
            this.lastSelectedText = selectedText;
            console.log('✅ Selection detected in block using getComposedRanges:', selectedText);
            
            // Create range and get rect
            const range = WysiwygSelection.createRangeFromInfo(selectionInfo);
            const rect = range.getBoundingClientRect();
            
            // Dispatch event
            this.dispatchEvent(new CustomEvent('block-text-selected', {
              detail: {
                text: selectedText.trim(),
                blockId: this.block.id,
                range: range,
                rect: rect,
                hasSelection: true
              },
              bubbles: true,
              composed: true
            }));
          }
        } else if (this.lastSelectedText) {
          // Clear selection if no longer in this block
          this.lastSelectedText = '';
          this.dispatchEvent(new CustomEvent('block-text-selected', {
            detail: {
              text: '',
              blockId: this.block.id,
              hasSelection: false
            },
            bubbles: true,
            composed: true
          }));
        }
      };
      
      // Listen for selection changes
      document.addEventListener('selectionchange', checkSelection);
      
      // Store the handler for cleanup
      (this as any)._selectionHandler = checkSelection;
      
      // Add keyup handler for cursor position tracking
      editableBlock.addEventListener('keyup', (e) => {
        // Track cursor position
        const pos = this.getCursorPosition(editableBlock);
        if (pos !== null) {
          this.lastKnownCursorPosition = pos;
        }
      });
      
      // Set initial content if needed
      if (this.block.content) {
        if (this.block.type === 'code') {
          editableBlock.textContent = this.block.content;
        } else if (this.block.type === 'list') {
          editableBlock.innerHTML = WysiwygBlocks.renderListContent(this.block.content, this.block.metadata);
        } else {
          editableBlock.innerHTML = this.block.content;
        }
      }
    }
    
    // Store reference to the block element for quick access
    this.blockElement = editableBlock;
  }

  render(): TemplateResult {
    if (!this.block) return html``;

    // Since we need dynamic content, we'll render an empty container
    // and set the innerHTML in firstUpdated
    return html`<div class="wysiwyg-block-container"></div>`;
  }
  
  private renderBlockContent(): string {
    if (!this.block) return '';

    if (this.block.type === 'divider') {
      return `
        <div class="block divider" data-block-id="${this.block.id}" data-block-type="${this.block.type}">
          <hr>
        </div>
      `;
    }

    if (this.block.type === 'code') {
      const language = this.block.metadata?.language || 'plain text';
      const selectedClass = this.isSelected ? ' selected' : '';
      return `
        <div class="code-block-container">
          <div class="code-language">${language}</div>
          <div
            class="block code${selectedClass}"
            contenteditable="true"
            data-block-type="${this.block.type}"
          ></div>
        </div>
      `;
    }

    const placeholder = this.getPlaceholder();
    const selectedClass = this.isSelected ? ' selected' : '';
    return `
      <div
        class="block ${this.block.type}${selectedClass}"
        contenteditable="true"
        data-placeholder="${placeholder}"
      ></div>
    `;
  }

  private getPlaceholder(): string {
    switch (this.block.type) {
      case 'paragraph':
        return "Type '/' for commands...";
      case 'heading-1':
        return 'Heading 1';
      case 'heading-2':
        return 'Heading 2';
      case 'heading-3':
        return 'Heading 3';
      case 'quote':
        return 'Quote';
      default:
        return '';
    }
  }


  public focus(): void {
    // Get the actual editable element (might be nested for code blocks)
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      
    if (!editableElement) return;
    
    // Ensure the element is focusable
    if (!editableElement.hasAttribute('contenteditable')) {
      editableElement.setAttribute('contenteditable', 'true');
    }
    
    editableElement.focus();
    
    // If focus failed, try again after a microtask
    if (document.activeElement !== editableElement && this.shadowRoot?.activeElement !== editableElement) {
      Promise.resolve().then(() => {
        editableElement.focus();
      });
    }
  }
  
  public focusWithCursor(position: 'start' | 'end' | number = 'end'): void {
    // Get the actual editable element (might be nested for code blocks)
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      
    if (!editableElement) return;
    
    // Ensure element is focusable first
    if (!editableElement.hasAttribute('contenteditable')) {
      editableElement.setAttribute('contenteditable', 'true');
    }
    
    // Focus the element
    editableElement.focus();
    
    // Set cursor position after focus is established
    const setCursor = () => {
      if (position === 'start') {
        this.setCursorToStart();
      } else if (position === 'end') {
        this.setCursorToEnd();
      } else if (typeof position === 'number') {
        // Use the new selection utility to set cursor position
        WysiwygSelection.setCursorPosition(editableElement, position);
      }
    };
    
    // Ensure cursor is set after focus
    if (document.activeElement === editableElement || this.shadowRoot?.activeElement === editableElement) {
      setCursor();
    } else {
      // Wait for focus to be established
      Promise.resolve().then(() => {
        if (document.activeElement === editableElement || this.shadowRoot?.activeElement === editableElement) {
          setCursor();
        }
      });
    }
  }
  
  

  /**
   * Get cursor position in the editable element
   */
  public getCursorPosition(element: HTMLElement): number | null {
    // Get parent wysiwyg component's shadow root
    const parentComponent = this.closest('dees-input-wysiwyg');
    const parentShadowRoot = parentComponent?.shadowRoot;
    
    // Get selection info with both shadow roots for proper traversal
    const shadowRoots: ShadowRoot[] = [];
    if (parentShadowRoot) shadowRoots.push(parentShadowRoot);
    if (this.shadowRoot) shadowRoots.push(this.shadowRoot);
    
    const selectionInfo = WysiwygSelection.getSelectionInfo(...shadowRoots);
    console.log('getCursorPosition: Selection info from shadow DOMs:', {
      selectionInfo,
      shadowRootsCount: shadowRoots.length
    });
    
    if (!selectionInfo) {
      console.log('getCursorPosition: No selection found');
      return null;
    }
    
    console.log('getCursorPosition: Range info:', {
      startContainer: selectionInfo.startContainer,
      startOffset: selectionInfo.startOffset,
      collapsed: selectionInfo.collapsed,
      startContainerText: selectionInfo.startContainer.textContent
    });
    
    if (!element.contains(selectionInfo.startContainer)) {
      console.log('getCursorPosition: Range not in element');
      return null;
    }
    
    // Create a range from start of element to cursor position
    const preCaretRange = document.createRange();
    preCaretRange.selectNodeContents(element);
    preCaretRange.setEnd(selectionInfo.startContainer, selectionInfo.startOffset);
    
    // Get the text content length up to cursor
    const position = preCaretRange.toString().length;
    console.log('getCursorPosition: Calculated position:', {
      position,
      preCaretText: preCaretRange.toString(),
      elementText: element.textContent,
      elementTextLength: element.textContent?.length
    });
    
    return position;
  }

  public getContent(): string {
    // Get the actual editable element (might be nested for code blocks)
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      
    if (!editableElement) return '';
    
    if (this.block.type === 'list') {
      const listItems = editableElement.querySelectorAll('li');
      return Array.from(listItems).map(li => li.innerHTML || '').join('\n');
    } else if (this.block.type === 'code') {
      return editableElement.textContent || '';
    } else {
      return editableElement.innerHTML || '';
    }
  }

  public setContent(content: string): void {
    // Get the actual editable element (might be nested for code blocks)
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      
    if (!editableElement) return;
    
    // Store if we have focus
    const hadFocus = document.activeElement === editableElement || this.shadowRoot?.activeElement === editableElement;
    
    if (this.block.type === 'list') {
      editableElement.innerHTML = WysiwygBlocks.renderListContent(content, this.block.metadata);
    } else if (this.block.type === 'code') {
      editableElement.textContent = content;
    } else {
      editableElement.innerHTML = content;
    }
    
    // Restore focus if we had it
    if (hadFocus) {
      editableElement.focus();
    }
  }

  public setCursorToStart(): void {
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.blockElement;
    if (editableElement) {
      WysiwygBlocks.setCursorToStart(editableElement);
    }
  }

  public setCursorToEnd(): void {
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.blockElement;
    if (editableElement) {
      WysiwygBlocks.setCursorToEnd(editableElement);
    }
  }

  public focusListItem(): void {
    if (this.block.type === 'list') {
      const editableElement = this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      if (editableElement) {
        WysiwygBlocks.focusListItem(editableElement);
      }
    }
  }
  
  /**
   * Gets content split at cursor position
   */
  public getSplitContent(): { before: string; after: string } | null {
    console.log('getSplitContent: Starting...');
    
    // Get the actual editable element first
    const editableElement = this.block?.type === 'code' 
      ? this.shadowRoot?.querySelector('.block.code') as HTMLDivElement
      : this.shadowRoot?.querySelector('.block') as HTMLDivElement;
      
    if (!editableElement) {
      console.log('getSplitContent: No editable element found');
      return null;
    }
    
    console.log('getSplitContent: Element info:', {
      blockType: this.block.type,
      innerHTML: editableElement.innerHTML,
      textContent: editableElement.textContent,
      textLength: editableElement.textContent?.length
    });
    
    // Get parent wysiwyg component's shadow root
    const parentComponent = this.closest('dees-input-wysiwyg');
    const parentShadowRoot = parentComponent?.shadowRoot;
    
    // Get selection info with both shadow roots for proper traversal
    const shadowRoots: ShadowRoot[] = [];
    if (parentShadowRoot) shadowRoots.push(parentShadowRoot);
    if (this.shadowRoot) shadowRoots.push(this.shadowRoot);
    
    const selectionInfo = WysiwygSelection.getSelectionInfo(...shadowRoots);
    console.log('getSplitContent: Selection info from shadow DOMs:', {
      selectionInfo,
      shadowRootsCount: shadowRoots.length
    });
    
    if (!selectionInfo) {
      console.log('getSplitContent: No selection, using last known position:', this.lastKnownCursorPosition);
      // Try using last known cursor position
      if (this.lastKnownCursorPosition !== null) {
        const fullText = editableElement.textContent || '';
        const pos = Math.min(this.lastKnownCursorPosition, fullText.length);
        console.log('getSplitContent: Splitting with last known position:', {
          pos,
          fullTextLength: fullText.length,
          before: fullText.substring(0, pos),
          after: fullText.substring(pos)
        });
        return {
          before: fullText.substring(0, pos),
          after: fullText.substring(pos)
        };
      }
      return null;
    }
    
    console.log('getSplitContent: Selection range:', {
      startContainer: selectionInfo.startContainer,
      startOffset: selectionInfo.startOffset,
      startContainerInElement: editableElement.contains(selectionInfo.startContainer)
    });
    
    // Make sure the selection is within this block
    if (!editableElement.contains(selectionInfo.startContainer)) {
      console.log('getSplitContent: Selection not in this block, using last known position:', this.lastKnownCursorPosition);
      // Try using last known cursor position
      if (this.lastKnownCursorPosition !== null) {
        const fullText = editableElement.textContent || '';
        const pos = Math.min(this.lastKnownCursorPosition, fullText.length);
        return {
          before: fullText.substring(0, pos),
          after: fullText.substring(pos)
        };
      }
      return null;
    }
    
    // For code blocks, use simple text splitting
    if (this.block.type === 'code') {
      const cursorPos = this.getCursorPosition(editableElement) || 0;
      const fullText = editableElement.textContent || '';
      
      console.log('getSplitContent: Code block split:', {
        cursorPos,
        fullTextLength: fullText.length,
        before: fullText.substring(0, cursorPos),
        after: fullText.substring(cursorPos)
      });
      
      return {
        before: fullText.substring(0, cursorPos),
        after: fullText.substring(cursorPos)
      };
    }
    
    // For HTML content, get cursor position first
    const cursorPos = this.getCursorPosition(editableElement);
    console.log('getSplitContent: Cursor position for HTML split:', cursorPos);
    
    if (cursorPos === null || cursorPos === 0) {
      // If cursor is at start or can't determine position, move all content
      console.log('getSplitContent: Cursor at start or null, moving all content');
      return {
        before: '',
        after: editableElement.innerHTML
      };
    }
    
    // For HTML content, split using ranges to preserve formatting
    const beforeRange = document.createRange();
    const afterRange = document.createRange();
    
    // Before range: from start of element to cursor
    beforeRange.setStart(editableElement, 0);
    beforeRange.setEnd(selectionInfo.startContainer, selectionInfo.startOffset);
    
    // After range: from cursor to end of element
    afterRange.setStart(selectionInfo.startContainer, selectionInfo.startOffset);
    afterRange.setEnd(editableElement, editableElement.childNodes.length);
    
    // Extract HTML content
    const beforeFragment = beforeRange.cloneContents();
    const afterFragment = afterRange.cloneContents();
    
    // Convert to HTML strings
    const tempDiv = document.createElement('div');
    tempDiv.appendChild(beforeFragment);
    const beforeHtml = tempDiv.innerHTML;
    
    tempDiv.innerHTML = '';
    tempDiv.appendChild(afterFragment);
    const afterHtml = tempDiv.innerHTML;
    
    console.log('getSplitContent: Final split result:', {
      cursorPos,
      beforeHtml,
      beforeLength: beforeHtml.length,
      beforeHtmlPreview: beforeHtml.substring(0, 100) + (beforeHtml.length > 100 ? '...' : ''),
      afterHtml,
      afterLength: afterHtml.length,
      afterHtmlPreview: afterHtml.substring(0, 100) + (afterHtml.length > 100 ? '...' : '')
    });
    
    return { 
      before: beforeHtml, 
      after: afterHtml 
    };
  }
  
}