Input & Hardware

/**
 * Barcode scanner configuration options
 */
interface BarcodeScannerOptions {
  /** Prefer front camera for scanning */
  preferFrontCamera?: boolean;
  /** Show flip camera button */
  showFlipCameraButton?: boolean;
  /** Show torch button */
  showTorchButton?: boolean;
  /** Start with torch on */
  torchOn?: boolean;
  /** Prompt text displayed to user */
  prompt?: string;
  /** Duration to display result in milliseconds */
  resultDisplayDuration?: number;
  /** Supported barcode formats (comma-separated) */
  formats?: string;
  /** Screen orientation (portrait, landscape) */
  orientation?: string;
  /** Disable animations */
  disableAnimations?: boolean;
  /** Disable success beep */
  disableSuccessBeep?: boolean;
}

/**
 * Barcode scan result
 */
interface BarcodeScanResult {
  /** Scanned text content */
  text: string;
  /** Barcode format (QR_CODE, UPC_A, CODE_128, etc.) */
  format: string;
  /** Whether scan was cancelled by user */
  cancelled: boolean;
}

/**
 * BarcodeScanner class for scanning barcodes and QR codes
 */
class BarcodeScanner {
  /**
   * Scan barcode using device camera
   * @param options Scanner configuration options
   * @returns Promise resolving to BarcodeScanResult
   */
  static scan(options?: BarcodeScannerOptions): Promise<BarcodeScanResult>;

  /**
   * Encode text into barcode
   * @param type Barcode type (TEXT_TYPE, EMAIL_TYPE, PHONE_TYPE, etc.)
   * @param data Data to encode
   * @returns Promise resolving to encoded barcode
   */
  static encode(type: string, data: any): Promise<any>;
}

import { BarcodeScanner, BarcodeScannerOptions, BarcodeScanResult } from 'ionic-native';

// Basic barcode scanning
async function scanBarcode(): Promise<BarcodeScanResult | null> {
  const options: BarcodeScannerOptions = {
    preferFrontCamera: false,
    showFlipCameraButton: true,
    showTorchButton: true,
    torchOn: false,
    prompt: "Place a barcode inside the scan area",
    resultDisplayDuration: 500,
    formats: "QR_CODE,PDF_417,CODE_128,CODE_39,UPC_A,UPC_E,EAN_13,EAN_8",
    orientation: "portrait",
    disableAnimations: true,
    disableSuccessBeep: false
  };

  try {
    const result = await BarcodeScanner.scan(options);
    
    if (result.cancelled) {
      console.log('Scan cancelled by user');
      return null;
    }
    
    console.log('Scanned result:', {
      text: result.text,
      format: result.format
    });
    
    return result;
  } catch (error) {
    console.error('Scan failed:', error);
    throw error;
  }
}

// QR Code specific scanning
class QRCodeScanner {
  
  async scanQRCode(): Promise<BarcodeScanResult | null> {
    const options: BarcodeScannerOptions = {
      preferFrontCamera: false,
      showFlipCameraButton: false,
      showTorchButton: true,
      prompt: "Scan QR Code",
      formats: "QR_CODE",
      orientation: "portrait"
    };

    try {
      const result = await BarcodeScanner.scan(options);
      
      if (!result.cancelled) {
        return this.parseQRCodeContent(result);
      }
      
      return null;
    } catch (error) {
      console.error('QR Code scan failed:', error);
      throw error;
    }
  }
  
  private parseQRCodeContent(result: BarcodeScanResult): BarcodeScanResult {
    const text = result.text;
    
    // Parse different QR code types
    if (text.startsWith('http://') || text.startsWith('https://')) {
      console.log('URL detected:', text);
    } else if (text.startsWith('wifi:')) {
      console.log('WiFi credentials detected');
      this.parseWiFiQR(text);
    } else if (text.startsWith('mailto:')) {
      console.log('Email detected:', text);
    } else if (text.startsWith('tel:')) {
      console.log('Phone number detected:', text);
    } else if (text.startsWith('geo:')) {
      console.log('Location detected:', text);
    } else {
      console.log('Plain text:', text);
    }
    
    return result;
  }
  
  private parseWiFiQR(qrText: string): { ssid: string; password: string; security: string } | null {
    // Parse WiFi QR format: WIFI:T:WPA;S:MyNetwork;P:MyPassword;;
    const wifiMatch = qrText.match(/WIFI:T:([^;]*);S:([^;]*);P:([^;]*);/);
    
    if (wifiMatch) {
      return {
        security: wifiMatch[1],
        ssid: wifiMatch[2],
        password: wifiMatch[3]
      };
    }
    
    return null;
  }
  
  async generateQRCode(data: string, type: string = 'TEXT_TYPE'): Promise<any> {
    try {
      const result = await BarcodeScanner.encode(type, data);
      console.log('QR Code generated:', result);
      return result;
    } catch (error) {
      console.error('QR Code generation failed:', error);
      throw error;
    }
  }
}

// Inventory scanning system
class InventoryScanner {
  private scannedItems: Map<string, any> = new Map();
  
  async scanInventoryItem(): Promise<void> {
    const options: BarcodeScannerOptions = {
      prompt: "Scan product barcode",
      formats: "UPC_A,UPC_E,EAN_13,EAN_8,CODE_128,CODE_39",
      showTorchButton: true,
      disableSuccessBeep: false
    };

    try {
      const result = await BarcodeScanner.scan(options);
      
      if (!result.cancelled) {
        await this.processInventoryItem(result);
      }
    } catch (error) {
      console.error('Inventory scan failed:', error);
    }
  }
  
  private async processInventoryItem(scanResult: BarcodeScanResult): Promise<void> {
    const barcode = scanResult.text;
    
    // Check if item already scanned
    if (this.scannedItems.has(barcode)) {
      const item = this.scannedItems.get(barcode);
      item.quantity += 1;
      console.log(`Updated quantity for ${item.name}: ${item.quantity}`);
    } else {
      // Look up product information
      const productInfo = await this.lookupProduct(barcode);
      
      if (productInfo) {
        this.scannedItems.set(barcode, {
          ...productInfo,
          barcode,
          quantity: 1,
          scannedAt: new Date()
        });
        
        console.log('New item added:', productInfo.name);
      } else {
        console.warn('Product not found for barcode:', barcode);
        // Add unknown item
        this.scannedItems.set(barcode, {
          barcode,
          name: 'Unknown Product',
          quantity: 1,
          scannedAt: new Date()
        });
      }
    }
  }
  
  private async lookupProduct(barcode: string): Promise<any> {
    try {
      // Mock API call to product database
      const response = await fetch(`https://api.example.com/products/${barcode}`);
      
      if (response.ok) {
        return await response.json();
      }
      
      return null;
    } catch (error) {
      console.error('Product lookup failed:', error);
      return null;
    }
  }
  
  getScannedItems(): any[] {
    return Array.from(this.scannedItems.values());
  }
  
  clearScannedItems(): void {
    this.scannedItems.clear();
  }
  
  exportScanResults(): string {
    const items = this.getScannedItems();
    return JSON.stringify(items, null, 2);
  }
}

/**
 * NDEF event data
 */
interface NdefEvent {
  /** NFC tag information */
  tag: {
    /** Tag ID */
    id: number[];
    /** Technologies supported by tag */
    techTypes: string[];
    /** Tag type */
    type: string;
    /** Maximum NDEF message size */
    maxSize: number;
    /** Whether tag is writable */
    isWritable: boolean;
    /** Whether tag can be made read-only */
    canMakeReadOnly: boolean;
  };
  /** NDEF message */
  message: NdefRecord[];
}

/**
 * NDEF record structure
 */
interface NdefRecord {
  /** Record ID */
  id: number[];
  /** TNF (Type Name Format) */
  tnf: number;
  /** Record type */
  type: number[];
  /** Record payload */
  payload: number[];
}

/**
 * Tag discovery event
 */
interface TagEvent {
  /** Tag information */
  tag: {
    id: number[];
    techTypes: string[];
  };
}

/**
 * NFC class for Near Field Communication
 */
class NFC {
  /**
   * Add NDEF listener for NDEF-formatted tags
   * @returns Observable emitting NDEF events
   */
  static addNdefListener(): Observable<NdefEvent>;

  /**
   * Add listener for any NFC tag discovery
   * @returns Observable emitting tag discovery events
   */
  static addTagDiscoveredListener(): Observable<TagEvent>;

  /**
   * Add listener for specific MIME type NDEF records
   * @param mimeType MIME type to listen for
   * @returns Observable emitting matching NDEF events
   */
  static addMimeTypeListener(mimeType: string): Observable<NdefEvent>;

  /**
   * Add listener for NDEF formatable tags
   * @returns Observable emitting formatable tag events
   */
  static addNdefFormatableListener(): Observable<TagEvent>;

  /**
   * Write NDEF message to tag
   * @param message Array of NDEF records
   * @returns Promise indicating write completion
   */
  static write(message: any[]): Promise<any>;

  /**
   * Make tag read-only
   * @returns Promise indicating completion
   */
  static makeReadOnly(): Promise<any>;

  /**
   * Share NDEF message via Android Beam
   * @param message Array of NDEF records
   * @returns Promise indicating share setup completion
   */
  static share(message: any[]): Promise<any>;

  /**
   * Stop sharing via Android Beam
   * @returns Promise indicating stop completion
   */
  static unshare(): Promise<any>;

  /**
   * Erase NDEF tag
   * @returns Promise indicating erase completion
   */
  static erase(): Promise<any>;

  /**
   * Handover to other device via NFC
   * @param uris Array of URIs to handover
   * @returns Promise indicating handover completion
   */
  static handover(uris: string[]): Promise<any>;

  /**
   * Stop handover
   * @returns Promise indicating stop completion
   */
  static stopHandover(): Promise<any>;

  /**
   * Show NFC settings
   * @returns Promise indicating settings display
   */
  static showSettings(): Promise<any>;

  /**
   * Check if NFC is enabled
   * @returns Promise resolving to NFC status
   */
  static enabled(): Promise<any>;
}

import { NFC, NdefEvent, TagEvent } from 'ionic-native';

// NFC service for tag operations
class NFCService {
  private ndefListener: any;
  private tagListener: any;
  
  async initialize(): Promise<boolean> {
    try {
      const isEnabled = await NFC.enabled();
      
      if (!isEnabled) {
        console.log('NFC not enabled');
        await NFC.showSettings();
        return false;
      }
      
      this.setupListeners();
      console.log('NFC service initialized');
      return true;
    } catch (error) {
      console.error('NFC initialization failed:', error);
      return false;
    }
  }
  
  private setupListeners(): void {
    // Listen for NDEF tags
    this.ndefListener = NFC.addNdefListener().subscribe(
      (event: NdefEvent) => {
        console.log('NDEF tag detected:', event);
        this.handleNdefTag(event);
      },
      (error) => {
        console.error('NDEF listener error:', error);
      }
    );
    
    // Listen for any NFC tags
    this.tagListener = NFC.addTagDiscoveredListener().subscribe(
      (event: TagEvent) => {
        console.log('NFC tag discovered:', event);
        this.handleTagDiscovery(event);
      },
      (error) => {
        console.error('Tag listener error:', error);
      }
    );
  }
  
  private handleNdefTag(event: NdefEvent): void {
    const message = event.message;
    
    message.forEach((record, index) => {
      const payload = this.parseNdefRecord(record);
      console.log(`NDEF Record ${index}:`, payload);
    });
  }
  
  private parseNdefRecord(record: NdefRecord): any {
    // Convert payload to string (simplified parsing)
    const payload = String.fromCharCode.apply(null, record.payload);
    
    // Handle different TNF types
    switch (record.tnf) {
      case 1: // Well Known Type
        return this.parseWellKnownType(record.type, payload);
      case 2: // MIME Media Type
        return { type: 'mime', payload };
      case 3: // Absolute URI
        return { type: 'uri', payload };
      case 4: // External Type
        return { type: 'external', payload };
      default:
        return { type: 'unknown', payload };
    }
  }
  
  private parseWellKnownType(type: number[], payload: string): any {
    const typeString = String.fromCharCode.apply(null, type);
    
    switch (typeString) {
      case 'T': // Text
        return { type: 'text', text: payload.substring(3) }; // Skip language code
      case 'U': // URI
        return { type: 'uri', uri: this.decodeUri(payload) };
      default:
        return { type: typeString, payload };
    }
  }
  
  private decodeUri(payload: string): string {
    // URI prefixes for NDEF URI records
    const uriPrefixes = [
      '', 'http://www.', 'https://www.', 'http://', 'https://',
      'tel:', 'mailto:', 'ftp://anonymous:anonymous@', 'ftp://ftp.',
      'ftps://', 'sftp://', 'smb://', 'nfs://', 'ftp://', 'dav://',
      'news:', 'telnet://', 'imap:', 'rtsp://', 'urn:', 'pop:',
      'sip:', 'sips:', 'tftp:', 'btspp://', 'btl2cap://', 'btgoep://',
      'tcpobex://', 'irdaobex://', 'file://', 'urn:epc:id:', 'urn:epc:tag:',
      'urn:epc:pat:', 'urn:epc:raw:', 'urn:epc:', 'urn:nfc:'
    ];
    
    const prefixIndex = payload.charCodeAt(0);
    const prefix = uriPrefixes[prefixIndex] || '';
    
    return prefix + payload.substring(1);
  }
  
  private handleTagDiscovery(event: TagEvent): void {
    console.log('Tag technologies:', event.tag.techTypes);
    
    // Handle different tag types
    if (event.tag.techTypes.includes('android.nfc.tech.Ndef')) {
      console.log('NDEF-compatible tag detected');
    }
    
    if (event.tag.techTypes.includes('android.nfc.tech.NdefFormatable')) {
      console.log('Formatable tag detected');
    }
  }
  
  async writeTextToTag(text: string, language: string = 'en'): Promise<void> {
    try {
      const textRecord = {
        tnf: 1, // Well Known Type
        type: [0x54], // 'T' for text
        payload: this.encodeTextPayload(text, language),
        id: []
      };
      
      await NFC.write([textRecord]);
      console.log('Text written to NFC tag:', text);
    } catch (error) {
      console.error('NFC write failed:', error);
      throw error;
    }
  }
  
  async writeUriToTag(uri: string): Promise<void> {
    try {
      const uriRecord = {
        tnf: 1, // Well Known Type
        type: [0x55], // 'U' for URI
        payload: this.encodeUriPayload(uri),
        id: []
      };
      
      await NFC.write([uriRecord]);
      console.log('URI written to NFC tag:', uri);
    } catch (error) {
      console.error('NFC URI write failed:', error);
      throw error;
    }
  }
  
  private encodeTextPayload(text: string, language: string): number[] {
    const langBytes = Array.from(language).map(c => c.charCodeAt(0));
    const textBytes = Array.from(text).map(c => c.charCodeAt(0));
    
    // Format: [flags, lang_length, ...lang_bytes, ...text_bytes]
    return [0x02, langBytes.length, ...langBytes, ...textBytes];
  }
  
  private encodeUriPayload(uri: string): number[] {
    // Find best URI prefix
    const prefixes = ['http://www.', 'https://www.', 'http://', 'https://'];
    let prefixIndex = 0;
    let remainder = uri;
    
    for (let i = 0; i < prefixes.length; i++) {
      if (uri.startsWith(prefixes[i])) {
        prefixIndex = i + 1;
        remainder = uri.substring(prefixes[i].length);
        break;
      }
    }
    
    const remainderBytes = Array.from(remainder).map(c => c.charCodeAt(0));
    return [prefixIndex, ...remainderBytes];
  }
  
  async makeTagReadOnly(): Promise<void> {
    try {
      await NFC.makeReadOnly();
      console.log('NFC tag made read-only');
    } catch (error) {
      console.error('Failed to make tag read-only:', error);
      throw error;
    }
  }
  
  async eraseTag(): Promise<void> {
    try {
      await NFC.erase();
      console.log('NFC tag erased');
    } catch (error) {
      console.error('Failed to erase tag:', error);
      throw error;
    }
  }
  
  destroy(): void {
    if (this.ndefListener) {
      this.ndefListener.unsubscribe();
    }
    
    if (this.tagListener) {
      this.tagListener.unsubscribe();
    }
  }
}

// NFC-based app launcher
class NFCAppLauncher extends NFCService {
  
  async createAppLaunchTag(appId: string, additionalData?: any): Promise<void> {
    const launchData = {
      action: 'launch_app',
      appId,
      data: additionalData,
      timestamp: new Date().toISOString()
    };
    
    const jsonString = JSON.stringify(launchData);
    await this.writeTextToTag(jsonString);
  }
  
  async createWiFiTag(ssid: string, password: string, security: string = 'WPA'): Promise<void> {
    // Create WiFi configuration URI
    const wifiUri = `WIFI:T:${security};S:${ssid};P:${password};;`;
    await this.writeTextToTag(wifiUri);
  }
  
  async createContactTag(contact: {
    name: string;
    phone?: string;
    email?: string;
    url?: string;
  }): Promise<void> {
    // Create vCard format
    let vcard = 'BEGIN:VCARD\nVERSION:3.0\n';
    vcard += `FN:${contact.name}\n`;
    
    if (contact.phone) {
      vcard += `TEL:${contact.phone}\n`;
    }
    
    if (contact.email) {
      vcard += `EMAIL:${contact.email}\n`;
    }
    
    if (contact.url) {
      vcard += `URL:${contact.url}\n`;
    }
    
    vcard += 'END:VCARD';
    
    await this.writeTextToTag(vcard);
  }
}

/**
 * Keyboard class for keyboard management and events
 */
class Keyboard {
  /**
   * Hide keyboard programmatically
   */
  static hideKeyboard(): void;

  /**
   * Close keyboard (alias for hideKeyboard)
   */
  static close(): void;

  /**
   * Show keyboard programmatically
   */
  static show(): void;

  /**
   * Disable scroll when keyboard is shown
   * @param disable Whether to disable scroll
   */
  static disableScroll(disable: boolean): void;

  /**
   * Observable for keyboard show events
   * @returns Observable emitting keyboard show events
   */
  static onKeyboardShow(): Observable<any>;

  /**
   * Observable for keyboard hide events
   * @returns Observable emitting keyboard hide events
   */
  static onKeyboardHide(): Observable<any>;
}

import { Keyboard } from 'ionic-native';

// Keyboard management service
class KeyboardManager {
  private showSubscription: any;
  private hideSubscription: any;
  private keyboardHeight = 0;
  private isKeyboardVisible = false;
  
  initialize(): void {
    this.setupKeyboardListeners();
    console.log('Keyboard manager initialized');
  }
  
  private setupKeyboardListeners(): void {
    // Listen for keyboard show events
    this.showSubscription = Keyboard.onKeyboardShow().subscribe(
      (event) => {
        console.log('Keyboard shown:', event);
        this.isKeyboardVisible = true;
        this.keyboardHeight = event.keyboardHeight || 0;
        this.handleKeyboardShow(event);
      }
    );
    
    // Listen for keyboard hide events
    this.hideSubscription = Keyboard.onKeyboardHide().subscribe(
      (event) => {
        console.log('Keyboard hidden:', event);
        this.isKeyboardVisible = false;
        this.keyboardHeight = 0;
        this.handleKeyboardHide(event);
      }
    );
  }
  
  private handleKeyboardShow(event: any): void {
    // Adjust UI layout for keyboard
    this.adjustLayoutForKeyboard(event.keyboardHeight);
    
    // Disable page scrolling if needed
    Keyboard.disableScroll(true);
    
    // Ensure input field is visible
    this.ensureInputVisible();
  }
  
  private handleKeyboardHide(event: any): void {
    // Reset UI layout
    this.resetLayoutAfterKeyboard();
    
    // Re-enable page scrolling
    Keyboard.disableScroll(false);
  }
  
  private adjustLayoutForKeyboard(keyboardHeight: number): void {
    // Adjust content padding/margin to account for keyboard
    const content = document.querySelector('.main-content') as HTMLElement;
    if (content) {
      content.style.paddingBottom = `${keyboardHeight}px`;
    }
    
    // Adjust floating elements
    const floatingElements = document.querySelectorAll('.floating-element');
    floatingElements.forEach((element: HTMLElement) => {
      element.style.bottom = `${keyboardHeight}px`;
    });
  }
  
  private resetLayoutAfterKeyboard(): void {
    // Reset content padding
    const content = document.querySelector('.main-content') as HTMLElement;
    if (content) {
      content.style.paddingBottom = '';
    }
    
    // Reset floating elements
    const floatingElements = document.querySelectorAll('.floating-element');
    floatingElements.forEach((element: HTMLElement) => {
      element.style.bottom = '';
    });
  }
  
  private ensureInputVisible(): void {
    // Scroll active input into view
    const activeElement = document.activeElement as HTMLElement;
    if (activeElement && this.isInputElement(activeElement)) {
      setTimeout(() => {
        activeElement.scrollIntoView({ behavior: 'smooth', block: 'center' });
      }, 300);
    }
  }
  
  private isInputElement(element: HTMLElement): boolean {
    const inputTypes = ['input', 'textarea', 'select'];
    return inputTypes.includes(element.tagName.toLowerCase());
  }
  
  // Public methods
  showKeyboard(): void {
    Keyboard.show();
  }
  
  hideKeyboard(): void {
    Keyboard.hideKeyboard();
  }
  
  closeKeyboard(): void {
    Keyboard.close();
  }
  
  isVisible(): boolean {
    return this.isKeyboardVisible;
  }
  
  getHeight(): number {
    return this.keyboardHeight;
  }
  
  setScrollDisabled(disabled: boolean): void {
    Keyboard.disableScroll(disabled);
  }
  
  destroy(): void {
    if (this.showSubscription) {
      this.showSubscription.unsubscribe();
    }
    
    if (this.hideSubscription) {
      this.hideSubscription.unsubscribe();
    }
  }
}

// Enhanced keyboard service with form optimization
class SmartKeyboardService extends KeyboardManager {
  private activeForm: HTMLFormElement | null = null;
  private inputQueue: HTMLElement[] = [];
  private currentInputIndex = 0;
  
  initialize(): void {
    super.initialize();
    this.setupFormHandling();
  }
  
  private setupFormHandling(): void {
    // Monitor form focus events
    document.addEventListener('focusin', (event) => {
      const target = event.target as HTMLElement;
      
      if (this.isInputElement(target)) {
        this.handleInputFocus(target);
      }
    });
    
    // Monitor form submit events
    document.addEventListener('submit', (event) => {
      this.handleFormSubmit(event.target as HTMLFormElement);
    });
  }
  
  private handleInputFocus(input: HTMLElement): void {
    // Find parent form
    this.activeForm = input.closest('form');
    
    if (this.activeForm) {
      this.buildInputQueue();
      this.currentInputIndex = this.inputQueue.indexOf(input);
      this.setupFormNavigation();
    }
  }
  
  private buildInputQueue(): void {
    if (!this.activeForm) return;
    
    // Get all form inputs in tab order
    const inputs = Array.from(this.activeForm.querySelectorAll('input, textarea, select'))
      .filter((input: HTMLElement) => {
        return !input.hasAttribute('disabled') && 
               !input.hasAttribute('readonly') &&
               input.offsetParent !== null; // Visible elements only
      }) as HTMLElement[];
    
    this.inputQueue = inputs.sort((a, b) => {
      const aIndex = parseInt(a.getAttribute('tabindex') || '0');
      const bIndex = parseInt(b.getAttribute('tabindex') || '0');
      return aIndex - bIndex;
    });
  }
  
  private setupFormNavigation(): void {
    // Add next/previous buttons to keyboard toolbar if supported
    this.addKeyboardToolbar();
  }
  
  private addKeyboardToolbar(): void {
    // Create navigation buttons above keyboard
    const toolbar = document.createElement('div');
    toolbar.className = 'keyboard-toolbar';
    toolbar.innerHTML = `
      <button id="prev-input" ${this.currentInputIndex === 0 ? 'disabled' : ''}>Previous</button>
      <button id="next-input" ${this.currentInputIndex === this.inputQueue.length - 1 ? 'disabled' : ''}>Next</button>
      <button id="done-input">Done</button>
    `;
    
    // Position toolbar above keyboard
    toolbar.style.cssText = `
      position: fixed;
      bottom: ${this.getHeight()}px;
      left: 0;
      right: 0;
      background: #f0f0f0;
      border-top: 1px solid #ccc;
      padding: 8px;
      display: flex;
      justify-content: space-between;
      z-index: 9999;
    `;
    
    document.body.appendChild(toolbar);
    
    // Add event listeners
    document.getElementById('prev-input')?.addEventListener('click', () => this.goToPreviousInput());
    document.getElementById('next-input')?.addEventListener('click', () => this.goToNextInput());
    document.getElementById('done-input')?.addEventListener('click', () => this.hideKeyboard());
    
    // Remove toolbar when keyboard hides
    const hideSubscription = Keyboard.onKeyboardHide().subscribe(() => {
      toolbar.remove();
      hideSubscription.unsubscribe();
    });
  }
  
  private goToPreviousInput(): void {
    if (this.currentInputIndex > 0) {
      this.currentInputIndex--;
      this.inputQueue[this.currentInputIndex].focus();
    }
  }
  
  private goToNextInput(): void {
    if (this.currentInputIndex < this.inputQueue.length - 1) {
      this.currentInputIndex++;
      this.inputQueue[this.currentInputIndex].focus();
    }
  }
  
  private handleFormSubmit(form: HTMLFormElement): void {
    // Hide keyboard on form submit
    this.hideKeyboard();
  }
  
  // Auto-resize text areas
  setupAutoResizeTextarea(textarea: HTMLTextAreaElement): void {
    const adjust = () => {
      textarea.style.height = 'auto';
      textarea.style.height = textarea.scrollHeight + 'px';
    };
    
    textarea.addEventListener('input', adjust);
    textarea.addEventListener('focus', adjust);
    
    // Initial adjustment
    adjust();
  }
  
  // Smart input validation
  setupSmartValidation(input: HTMLInputElement): void {
    input.addEventListener('blur', () => {
      this.validateInput(input);
    });
    
    input.addEventListener('input', () => {
      // Real-time validation for certain types
      if (input.type === 'email' || input.type === 'tel') {
        this.validateInput(input);
      }
    });
  }
  
  private validateInput(input: HTMLInputElement): void {
    const value = input.value.trim();
    
    switch (input.type) {
      case 'email':
        const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        this.setValidationState(input, emailRegex.test(value) || value === '');
        break;
        
      case 'tel':
        const phoneRegex = /^[\d\s\-\+\(\)]+$/;
        this.setValidationState(input, phoneRegex.test(value) || value === '');
        break;
        
      case 'url':
        try {
          new URL(value);
          this.setValidationState(input, true);
        } catch {
          this.setValidationState(input, value === '');
        }
        break;
    }
  }
  
  private setValidationState(input: HTMLInputElement, isValid: boolean): void {
    if (isValid) {
      input.classList.remove('invalid');
      input.classList.add('valid');
    } else {
      input.classList.remove('valid');
      input.classList.add('invalid');
    }
  }
}

// Usage
const keyboardManager = new SmartKeyboardService();
keyboardManager.initialize();

// Auto-setup for forms
document.addEventListener('DOMContentLoaded', () => {
  // Setup auto-resize for all textareas
  document.querySelectorAll('textarea').forEach(textarea => {
    keyboardManager.setupAutoResizeTextarea(textarea as HTMLTextAreaElement);
  });
  
  // Setup smart validation for inputs
  document.querySelectorAll('input[type="email"], input[type="tel"], input[type="url"]').forEach(input => {
    keyboardManager.setupSmartValidation(input as HTMLInputElement);
  });
});