Input Handling

class EditorView {
  /**
   * Run the editor's paste logic with the given HTML string. The
   * `event`, if given, will be passed to the handlePaste hook.
   */
  pasteHTML(html: string, event?: ClipboardEvent): boolean;
  
  /**
   * Run the editor's paste logic with the given plain-text input.
   */
  pasteText(text: string, event?: ClipboardEvent): boolean;
  
  /**
   * Serialize the given slice as it would be if it was copied from
   * this editor. Returns a DOM element that contains a representation
   * of the slice as its children, a textual representation, and the
   * transformed slice.
   */
  serializeForClipboard(slice: Slice): {
    dom: HTMLElement, 
    text: string, 
    slice: Slice
  };
}

import { EditorView } from "prosemirror-view";
import { Slice } from "prosemirror-model";

// Programmatic paste operations
function pasteFormattedContent(view, htmlContent) {
  const success = view.pasteHTML(htmlContent);
  if (success) {
    console.log("HTML content pasted successfully");
  }
}

function pasteAsPlainText(view, textContent) {
  const success = view.pasteText(textContent);
  if (success) {
    console.log("Plain text pasted successfully");
  }
}

// Custom copy functionality
function copySelectionWithMetadata(view) {
  const selection = view.state.selection;
  const slice = selection.content();
  
  // Serialize for clipboard
  const { dom, text, slice: transformedSlice } = view.serializeForClipboard(slice);
  
  // Add custom metadata
  const metadata = {
    source: "my-editor",
    timestamp: new Date().toISOString(),
    selection: { from: selection.from, to: selection.to }
  };
  
  // Create enhanced clipboard data
  const clipboardData = new DataTransfer();
  clipboardData.setData("text/html", dom.innerHTML);
  clipboardData.setData("text/plain", text);
  clipboardData.setData("application/json", JSON.stringify(metadata));
  
  // Trigger clipboard event
  const clipEvent = new ClipboardEvent("copy", { clipboardData });
  view.dom.dispatchEvent(clipEvent);
}

// Smart paste handler
class SmartPasteHandler {
  constructor(view) {
    this.view = view;
    this.setupPasteHandling();
  }
  
  setupPasteHandling() {
    this.view.dom.addEventListener("paste", (event) => {
      this.handlePaste(event);
    });
  }
  
  handlePaste(event) {
    const clipboardData = event.clipboardData;
    if (!clipboardData) return;
    
    // Check for custom JSON metadata
    const jsonData = clipboardData.getData("application/json");
    if (jsonData) {
      try {
        const metadata = JSON.parse(jsonData);
        if (metadata.source === "my-editor") {
          this.handleInternalPaste(clipboardData, metadata);
          event.preventDefault();
          return;
        }
      } catch (e) {
        // Not valid JSON, continue with normal paste
      }
    }
    
    // Handle file paste
    const files = Array.from(clipboardData.files);
    if (files.length > 0) {
      this.handleFilePaste(files);
      event.preventDefault();
      return;
    }
    
    // Handle URL paste
    const text = clipboardData.getData("text/plain");
    if (this.isURL(text)) {
      this.handleURLPaste(text);
      event.preventDefault();
      return;
    }
  }
  
  handleInternalPaste(clipboardData, metadata) {
    const html = clipboardData.getData("text/html");
    console.log("Pasting internal content with metadata:", metadata);
    this.view.pasteHTML(html);
  }
  
  handleFilePaste(files) {
    files.forEach(file => {
      if (file.type.startsWith("image/")) {
        this.insertImageFromFile(file);
      }
    });
  }
  
  handleURLPaste(url) {
    // Auto-convert URLs to links
    const linkHTML = `<a href="${url}">${url}</a>`;
    this.view.pasteHTML(linkHTML);
  }
  
  isURL(text) {
    try {
      new URL(text);
      return true;
    } catch {
      return false;
    }
  }
  
  insertImageFromFile(file) {
    const reader = new FileReader();
    reader.onload = () => {
      const imageHTML = `<img src="${reader.result}" alt="${file.name}">`;
      this.view.pasteHTML(imageHTML);
    };
    reader.readAsDataURL(file);
  }
}

class EditorView {
  /**
   * Used for testing. Dispatches a DOM event to the view and returns
   * whether it was handled by the editor's event handling logic.
   */
  dispatchEvent(event: Event): boolean;
}

// Testing keyboard shortcuts
function testKeyboardShortcut(view, key, modifiers = {}) {
  const event = new KeyboardEvent("keydown", {
    key: key,
    ctrlKey: modifiers.ctrl || false,
    shiftKey: modifiers.shift || false,
    altKey: modifiers.alt || false,
    metaKey: modifiers.meta || false,
    bubbles: true,
    cancelable: true
  });
  
  const handled = view.dispatchEvent(event);
  console.log(`${key} shortcut ${handled ? "was" : "was not"} handled`);
  return handled;
}

// Test suite for editor shortcuts
function runShortcutTests(view) {
  const tests = [
    { key: "b", ctrl: true, name: "Bold" },
    { key: "i", ctrl: true, name: "Italic" },
    { key: "z", ctrl: true, name: "Undo" },
    { key: "y", ctrl: true, name: "Redo" },
    { key: "s", ctrl: true, name: "Save" }
  ];
  
  tests.forEach(test => {
    const handled = testKeyboardShortcut(view, test.key, { ctrl: test.ctrl });
    console.log(`${test.name}: ${handled ? "PASS" : "FAIL"}`);
  });
}

// Simulate user input for automation
class EditorAutomation {
  constructor(view) {
    this.view = view;
  }
  
  typeText(text, delay = 50) {
    const chars = text.split("");
    let index = 0;
    
    const typeNext = () => {
      if (index >= chars.length) return;
      
      const char = chars[index++];
      const event = new KeyboardEvent("keydown", {
        key: char,
        bubbles: true,
        cancelable: true
      });
      
      this.view.dispatchEvent(event);
      
      // Simulate actual text input
      const inputEvent = new InputEvent("input", {
        data: char,
        inputType: "insertText",
        bubbles: true,
        cancelable: true
      });
      
      this.view.dispatchEvent(inputEvent);
      
      setTimeout(typeNext, delay);
    };
    
    typeNext();
  }
  
  pressKey(key, modifiers = {}) {
    const event = new KeyboardEvent("keydown", {
      key: key,
      ctrlKey: modifiers.ctrl || false,
      shiftKey: modifiers.shift || false,
      altKey: modifiers.alt || false,
      metaKey: modifiers.meta || false,
      bubbles: true,
      cancelable: true
    });
    
    return this.view.dispatchEvent(event);
  }
  
  clickAt(pos) {
    const coords = this.view.coordsAtPos(pos);
    const event = new MouseEvent("click", {
      clientX: coords.left,
      clientY: coords.top,
      bubbles: true,
      cancelable: true
    });
    
    return this.view.dispatchEvent(event);
  }
}

// Usage
const automation = new EditorAutomation(view);
automation.typeText("Hello, world!");
automation.pressKey("Enter");
automation.typeText("This is a new paragraph.");

interface EditorProps<P = any> {
  /**
   * Called when the view, after updating its state, tries to scroll
   * the selection into view. A handler function may return false to
   * indicate that it did not handle the scrolling and further
   * handlers or the default behavior should be tried.
   */
  handleScrollToSelection?(this: P, view: EditorView): boolean;
  
  /**
   * Determines the distance (in pixels) between the cursor and the
   * end of the visible viewport at which point, when scrolling the
   * cursor into view, scrolling takes place. Defaults to 0.
   */
  scrollThreshold?: number | {
    top: number, 
    right: number, 
    bottom: number, 
    left: number
  };
  
  /**
   * Determines the extra space (in pixels) that is left above or
   * below the cursor when it is scrolled into view. Defaults to 5.
   */
  scrollMargin?: number | {
    top: number, 
    right: number, 
    bottom: number, 
    left: number
  };
}

// Custom scroll behavior
const view = new EditorView(element, {
  state: myState,
  
  handleScrollToSelection(view) {
    const selection = view.state.selection;
    const coords = view.coordsAtPos(selection.head);
    
    // Custom smooth scroll with animation
    const targetY = coords.top - window.innerHeight / 2;
    
    window.scrollTo({
      top: targetY,
      behavior: "smooth"
    });
    
    // Show cursor position indicator
    const indicator = document.createElement("div");
    indicator.className = "cursor-indicator";
    indicator.style.cssText = `
      position: fixed;
      left: ${coords.left}px;
      top: 50vh;
      width: 2px;
      height: 20px;
      background: #007acc;
      animation: blink 1s ease-in-out;
      pointer-events: none;
      z-index: 1000;
    `;
    
    document.body.appendChild(indicator);
    setTimeout(() => {
      document.body.removeChild(indicator);
    }, 1000);
    
    return true; // Indicate we handled the scrolling
  },
  
  scrollThreshold: {
    top: 100,
    bottom: 100,
    left: 50,
    right: 50
  },
  
  scrollMargin: {
    top: 80,  // Extra space for fixed header
    bottom: 20,
    left: 10,
    right: 10
  }
});

interface EditorProps<P = any> {
  /**
   * Can be used to override the way a selection is created when
   * reading a DOM selection between the given anchor and head.
   */
  createSelectionBetween?(
    this: P, 
    view: EditorView, 
    anchor: ResolvedPos, 
    head: ResolvedPos
  ): Selection | null;
  
  /**
   * Determines whether an in-editor drag event should copy or move
   * the selection. When not given, the event's altKey property is
   * used on macOS, ctrlKey on other platforms.
   */
  dragCopies?(event: DragEvent): boolean;
}

// Custom selection behavior
const view = new EditorView(element, {
  state: myState,
  
  createSelectionBetween(view, anchor, head) {
    // Custom selection logic for specific node types
    const anchorNode = anchor.parent;
    const headNode = head.parent;
    
    // If selecting across code blocks, select entire blocks
    if (anchorNode.type.name === "code_block" || headNode.type.name === "code_block") {
      const startPos = Math.min(anchor.start(), head.start());
      const endPos = Math.max(anchor.end(), head.end());
      
      return TextSelection.create(view.state.doc, startPos, endPos);
    }
    
    // If selecting across different list items, select entire items
    if (anchorNode.type.name === "list_item" && headNode.type.name === "list_item" && 
        anchorNode !== headNode) {
      const startPos = Math.min(anchor.start(), head.start());
      const endPos = Math.max(anchor.end(), head.end());
      
      return TextSelection.create(view.state.doc, startPos, endPos);
    }
    
    // Use default selection behavior
    return null;
  },
  
  dragCopies(event) {
    // Always copy when dragging images
    const selection = view.state.selection;
    if (selection instanceof NodeSelection && 
        selection.node.type.name === "image") {
      return true;
    }
    
    // Copy when Alt key is held (cross-platform)
    if (event.altKey) {
      return true;
    }
    
    // Move by default
    return false;
  }
});

// Advanced selection management
class SelectionManager {
  constructor(view) {
    this.view = view;
    this.selectionHistory = [];
    this.setupSelectionTracking();
  }
  
  setupSelectionTracking() {
    // Track selection changes
    let lastSelection = this.view.state.selection;
    
    this.view.dom.addEventListener("selectionchange", () => {
      const currentSelection = this.view.state.selection;
      
      if (!currentSelection.eq(lastSelection)) {
        this.addToHistory(lastSelection);
        lastSelection = currentSelection;
        this.onSelectionChange(currentSelection);
      }
    });
  }
  
  addToHistory(selection) {
    this.selectionHistory.push(selection);
    
    // Keep only last 50 selections
    if (this.selectionHistory.length > 50) {
      this.selectionHistory.shift();
    }
  }
  
  onSelectionChange(selection) {
    // Custom logic when selection changes
    console.log(`Selection changed: ${selection.from} to ${selection.to}`);
    
    // Update UI indicators
    this.updateSelectionIndicators(selection);
    
    // Emit custom event
    this.view.dom.dispatchEvent(new CustomEvent("editor-selection-change", {
      detail: { selection }
    }));
  }
  
  updateSelectionIndicators(selection) {
    // Show selection info in status bar
    const statusBar = document.querySelector("#status-bar");
    if (statusBar) {
      const text = selection.empty 
        ? `Position: ${selection.head}`
        : `Selected: ${selection.from} to ${selection.to} (${selection.to - selection.from} chars)`;
      
      statusBar.textContent = text;
    }
  }
  
  restorePreviousSelection() {
    if (this.selectionHistory.length > 0) {
      const previousSelection = this.selectionHistory.pop();
      const tr = this.view.state.tr.setSelection(previousSelection);
      this.view.dispatch(tr);
    }
  }
  
  selectWord(pos) {
    const doc = this.view.state.doc;
    const $pos = doc.resolve(pos);
    
    // Find word boundaries
    let start = pos;
    let end = pos;
    
    const textNode = $pos.parent.child($pos.index());
    if (textNode && textNode.isText) {
      const text = textNode.text;
      const offset = pos - $pos.start();
      
      // Find start of word
      while (start > $pos.start() && /\w/.test(text[offset - (pos - start) - 1])) {
        start--;
      }
      
      // Find end of word
      while (end < $pos.end() && /\w/.test(text[offset + (end - pos)])) {
        end++;
      }
    }
    
    const selection = TextSelection.create(doc, start, end);
    this.view.dispatch(this.view.state.tr.setSelection(selection));
  }
  
  selectLine(pos) {
    const doc = this.view.state.doc;
    const $pos = doc.resolve(pos);
    
    // Select entire line (paragraph)
    const start = $pos.start();
    const end = $pos.end();
    
    const selection = TextSelection.create(doc, start, end);
    this.view.dispatch(this.view.state.tr.setSelection(selection));
  }
}

// Usage
const selectionManager = new SelectionManager(view);

// Keyboard shortcuts for selection
view.dom.addEventListener("keydown", (event) => {
  if (event.ctrlKey && event.key === "w") {
    // Ctrl+W to select word
    const pos = view.state.selection.head;
    selectionManager.selectWord(pos);
    event.preventDefault();
  } else if (event.ctrlKey && event.key === "l") {
    // Ctrl+L to select line
    const pos = view.state.selection.head;
    selectionManager.selectLine(pos);
    event.preventDefault();
  } else if (event.ctrlKey && event.shiftKey && event.key === "z") {
    // Ctrl+Shift+Z to restore previous selection
    selectionManager.restorePreviousSelection();
    event.preventDefault();
  }
});

import { EditorView } from "prosemirror-view";
import { EditorState, TextSelection } from "prosemirror-state";

class AdvancedInputHandler {
  constructor(view) {
    this.view = view;
    this.setupInputHandling();
  }
  
  setupInputHandling() {
    // Comprehensive input handling setup
    this.view.setProps({
      ...this.view.props,
      
      handleKeyDown: this.handleKeyDown.bind(this),
      handleTextInput: this.handleTextInput.bind(this),
      handlePaste: this.handlePaste.bind(this),
      handleDrop: this.handleDrop.bind(this),
      handleDOMEvents: {
        compositionstart: this.handleCompositionStart.bind(this),
        compositionend: this.handleCompositionEnd.bind(this),
        input: this.handleInput.bind(this)
      }
    });
  }
  
  handleKeyDown(view, event) {
    // Custom keyboard shortcuts
    if (event.ctrlKey || event.metaKey) {
      switch (event.key) {
        case "s":
          this.saveDocument();
          return true;
        case "d":
          this.duplicateLine();
          return true;
        case "/":
          this.toggleComment();
          return true;
      }
    }
    
    // Auto-completion on Tab
    if (event.key === "Tab" && !event.shiftKey) {
      if (this.handleAutoCompletion()) {
        return true;
      }
    }
    
    return false;
  }
  
  handleTextInput(view, from, to, text, deflt) {
    // Smart quotes
    if (text === '"') {
      const beforeText = view.state.doc.textBetween(Math.max(0, from - 1), from);
      const isOpening = beforeText === "" || /\s/.test(beforeText);
      
      const tr = view.state.tr.insertText(isOpening ? """ : """, from, to);
      view.dispatch(tr);
      return true;
    }
    
    // Auto-pairing brackets
    const pairs = { "(": ")", "[": "]", "{": "}" };
    if (pairs[text]) {
      const tr = view.state.tr
        .insertText(text + pairs[text], from, to)
        .setSelection(TextSelection.create(view.state.doc, from + 1));
      view.dispatch(tr);
      return true;
    }
    
    // Markdown shortcuts
    if (text === " ") {
      const beforeText = view.state.doc.textBetween(Math.max(0, from - 10), from);
      
      // Headers
      const headerMatch = beforeText.match(/^(#{1,6})\s*(.*)$/);
      if (headerMatch) {
        const level = headerMatch[1].length;
        const content = headerMatch[2];
        
        // Convert to heading
        const tr = view.state.tr
          .delete(from - beforeText.length, from)
          .setBlockType(from - beforeText.length, from, 
                       view.state.schema.nodes.heading, { level });
        
        if (content) {
          tr.insertText(content);
        }
        
        view.dispatch(tr);
        return true;
      }
    }
    
    return false;
  }
  
  handlePaste(view, event, slice) {
    // Handle special paste formats
    const html = event.clipboardData?.getData("text/html");
    
    if (html && html.includes("data-table-source")) {
      return this.handleTablePaste(html);
    }
    
    return false;
  }
  
  handleDrop(view, event, slice, moved) {
    // Handle file drops
    const files = Array.from(event.dataTransfer?.files || []);
    
    if (files.length > 0) {
      this.handleFilesDrop(files, event);
      return true;
    }
    
    return false;
  }
  
  handleCompositionStart(view, event) {
    console.log("Composition started");
    this.composing = true;
    return false;
  }
  
  handleCompositionEnd(view, event) {
    console.log("Composition ended");
    this.composing = false;
    return false;
  }
  
  handleInput(view, event) {
    if (!this.composing) {
      // Process input when not composing
      this.processInput(event);
    }
    return false;
  }
  
  // Helper methods
  saveDocument() {
    const content = this.view.state.doc.toJSON();
    localStorage.setItem("document", JSON.stringify(content));
    console.log("Document saved");
  }
  
  duplicateLine() {
    const selection = this.view.state.selection;
    const $pos = this.view.state.doc.resolve(selection.head);
    const lineStart = $pos.start();
    const lineEnd = $pos.end();
    const lineContent = this.view.state.doc.slice(lineStart, lineEnd);
    
    const tr = this.view.state.tr.insert(lineEnd, lineContent.content);
    this.view.dispatch(tr);
  }
  
  toggleComment() {
    // Implementation depends on schema and comment system
    console.log("Toggle comment");
  }
  
  handleAutoCompletion() {
    // Implementation depends on completion system
    console.log("Auto-completion triggered");
    return false;
  }
  
  handleTablePaste(html) {
    // Custom table paste handling
    console.log("Handling table paste");
    return true;
  }
  
  handleFilesDrop(files, event) {
    const coords = this.view.posAtCoords({
      left: event.clientX,
      top: event.clientY
    });
    
    if (coords) {
      files.forEach(file => {
        if (file.type.startsWith("image/")) {
          this.insertImage(file, coords.pos);
        }
      });
    }
  }
  
  insertImage(file, pos) {
    const reader = new FileReader();
    reader.onload = () => {
      const img = this.view.state.schema.nodes.image.create({
        src: reader.result,
        alt: file.name
      });
      
      const tr = this.view.state.tr.insert(pos, img);
      this.view.dispatch(tr);
    };
    reader.readAsDataURL(file);
  }
  
  processInput(event) {
    // Additional input processing
    console.log("Processing input:", event.inputType, event.data);
  }
}

// Usage
const inputHandler = new AdvancedInputHandler(view);