Input Handling

/**
 * Base class for input event handling
 * @param {Manager} manager - Reference to the manager instance
 * @param {Function} callback - Callback function for processed input
 */
class Input {
  constructor(manager, callback);
  
  /** Initialize event listeners (virtual method) */
  init();
  
  /** Clean up event listeners (virtual method) */
  destroy();
  
  /** Handle input events (virtual method) */
  handler();
}

/**
 * Handles multi-touch input events
 * Supports multiple simultaneous touch points with full gesture data
 */
class TouchInput extends Input {
  constructor(manager, callback);
}

import Hammer from "hammerjs";

// TouchInput is automatically selected on touch devices
const mc = new Hammer(element);

// Force TouchInput specifically
const mc = new Hammer(element, {
  inputClass: Hammer.TouchInput
});

/**
 * Handles mouse input events
 * Simulates touch interactions using mouse events
 */
class MouseInput extends Input {
  constructor(manager, callback);
}

// MouseInput is automatically selected on non-touch devices
const mc = new Hammer(element);

// Force MouseInput specifically
const mc = new Hammer(element, {
  inputClass: Hammer.MouseInput
});

/**
 * Handles pointer events (IE10+, modern browsers)
 * Unified handling of touch, mouse, and pen input
 */
class PointerEventInput extends Input {
  constructor(manager, callback);
}

// PointerEventInput is automatically selected when supported
const mc = new Hammer(element);

// Force PointerEventInput specifically
const mc = new Hammer(element, {
  inputClass: Hammer.PointerEventInput
});

/**
 * Combined touch and mouse input with deduplication
 * Prevents double events on devices supporting both input types
 */
class TouchMouseInput extends Input {
  constructor(manager, callback);
}

// TouchMouseInput is the default for most scenarios
const mc = new Hammer(element);

// Explicitly use TouchMouse for hybrid devices
const mc = new Hammer(element, {
  inputClass: Hammer.TouchMouseInput
});

/**
 * Single touch input for simple interactions
 * Optimized for single-pointer gestures only
 */
class SingleTouchInput extends Input {
  constructor(manager, callback);
}

// Use SingleTouchInput for simple single-touch apps
const mc = new Hammer(element, {
  inputClass: Hammer.SingleTouchInput
});

// Good for basic tap and simple pan gestures
mc.on('tap pan', function(ev) {
  console.log('Simple gesture:', ev.type);
});

/**
 * Manages touch-action CSS property and polyfill
 * @param {Manager} manager - Reference to the manager
 * @param {string} value - Touch action value
 */
class TouchAction {
  constructor(manager, value);
  
  /** Set touch-action value */
  set(value);
  
  /** Update touch-action based on recognizers */
  update();
  
  /** Compute touch-action from recognizer settings */
  compute();
  
  /** Prevent default browser behavior */
  preventDefaults(input);
}

// TouchAction is managed automatically by the Manager
const mc = new Hammer(element, {
  touchAction: 'pan-y'  // Allow vertical panning only
});

// Dynamic touch action updates
mc.set({ touchAction: 'pan-x' });  // Switch to horizontal only
mc.set({ touchAction: 'none' });   // Prevent all browser gestures
mc.set({ touchAction: 'auto' });   // Allow all browser gestures

/**
 * Automatic input class selection based on browser support
 * Priority: PointerEventInput > TouchMouseInput > TouchInput > MouseInput
 */

// Input class selection logic (internal)
function createInputInstance(manager) {
  // Returns appropriate Input class based on:
  // - Pointer Events support
  // - Touch Events support  
  // - Mouse Events support
  // - Manager options.inputClass override
}

// Automatic selection (recommended)
const mc = new Hammer(element);

// Manual override when needed
const mc = new Hammer(element, {
  inputClass: Hammer.MouseInput  // Force mouse input
});

// Check what input class is being used
console.log(mc.input.constructor.name);

/**
 * Normalized input data structure
 */
interface InputData {
  /** Input event type (START, MOVE, END, CANCEL) */
  eventType: number;
  
  /** Center point of all pointers */
  center: {x: number, y: number};
  
  /** All active pointers */
  pointers: Array<Pointer>;
  
  /** Pointers that changed in this event */
  changedPointers: Array<Pointer>;
  
  /** Type of pointer input */
  pointerType: string;
  
  /** Original DOM event */
  srcEvent: Event;
  
  /** First event in session */
  isFirst: boolean;
  
  /** Final event in session */
  isFinal: boolean;
  
  /** Event timestamp */
  timeStamp: number;
}

// Touch events provide multi-touch support
// - touchstart, touchmove, touchend, touchcancel
// - Multiple simultaneous pointers
// - Touch-specific properties like force, radiusX/Y

const mc = new Hammer(element, {
  inputClass: Hammer.TouchInput
});

// Mouse events simulate touch behavior
// - mousedown, mousemove, mouseup
// - Single pointer simulation
// - Right-click handling

const mc = new Hammer(element, {
  inputClass: Hammer.MouseInput
});

// Unified pointer events for all input types
// - pointerdown, pointermove, pointerup, pointercancel
// - Supports touch, mouse, pen, and other pointer types
// - Modern browsers only (IE10+)

const mc = new Hammer(element, {
  inputClass: Hammer.PointerEventInput
});

interface Pointer {
  clientX: number;
  clientY: number;
  identifier: number;
  pointerId?: number;
  pointerType?: string;
}

interface InputEventTypes {
  INPUT_START: 1;
  INPUT_MOVE: 2;
  INPUT_END: 4;
  INPUT_CANCEL: 8;
}