/**
 * This file contains overrides the default
 * hammer.js functions to add our own utility
 */
/* eslint-disable */

/* Hammer.js constants */
const INPUT_START = 1;
const INPUT_MOVE = 2;
const INPUT_END = 4;
const MOUSE_INPUT_MAP = {
  mousedown: INPUT_START,
  mousemove: INPUT_MOVE,
  mouseup: INPUT_END
};

/**
 * Helper function that returns true if any element in an array meets given criteria.
 * Because older browsers do not support `Array.prototype.some`
 * @params array {Array}
 * @params predict {Function}
 */
function some(array, predict) {
  for (let i = 0; i < array.length; i++) {
    if (predict(array[i])) {
      return true;
    }
  }
  return false;
}

/* eslint-disable no-invalid-this */
export function enhancePointerEventInput(PointerEventInput) {
  const oldHandler = PointerEventInput.prototype.handler;

  // overrides PointerEventInput.handler to accept right mouse button
  PointerEventInput.prototype.handler = function handler(ev) {
    const store = this.store;

    // Allow non-left mouse buttons through
    if (ev.button > 0 && ev.type === 'pointerdown') {
      if (!some(store, e => e.pointerId === ev.pointerId)) {
        store.push(ev);
      }
    }

    oldHandler.call(this, ev);
  };
}

// overrides MouseInput.handler to accept right mouse button
export function enhanceMouseInput(MouseInput) {
  MouseInput.prototype.handler = function handler(ev) {
    let eventType = MOUSE_INPUT_MAP[ev.type];

    // on start we want to have the mouse button down
    if (eventType & INPUT_START && ev.button >= 0) {
      this.pressed = true;
    }

    if (eventType & INPUT_MOVE && ev.buttons === 0) {
      eventType = INPUT_END;
    }

    // mouse must be down
    if (!this.pressed) {
      return;
    }

    if (eventType & INPUT_END) {
      this.pressed = false;
    }

    this.callback(this.manager, eventType, {
      pointers: [ev],
      changedPointers: [ev],
      pointerType: 'mouse',
      srcEvent: ev
    });
  };
}