import {StringMap, Set} from 'angular2/src/core/facade/collection';
import {isPresent} from 'angular2/src/core/facade/lang';

const MOUSE_EVENT_PROPERTIES = [
  "altKey",
  "button",
  "clientX",
  "clientY",
  "metaKey",
  "movementX",
  "movementY",
  "offsetX",
  "offsetY",
  "region",
  "screenX",
  "screenY",
  "shiftKey"
];

const KEYBOARD_EVENT_PROPERTIES = [
  'altkey',
  'charCode',
  'code',
  'ctrlKey',
  'isComposing',
  'key',
  'keyCode',
  'location',
  'metaKey',
  'repeat',
  'shiftKey',
  'which'
];

const EVENT_PROPERTIES = ['type', 'bubbles', 'cancelable'];

const NODES_WITH_VALUE =
    new Set(["input", "select", "option", "button", "li", "meter", "progress", "param"]);

export function serializeGenericEvent(e: Event): StringMap<string, any> {
  return serializeEvent(e, EVENT_PROPERTIES);
}

// TODO(jteplitz602): Allow users to specify the properties they need rather than always
// adding value and files #3374
export function serializeEventWithTarget(e: Event): StringMap<string, any> {
  var serializedEvent = serializeEvent(e, EVENT_PROPERTIES);
  return addTarget(e, serializedEvent);
}

export function serializeMouseEvent(e: MouseEvent): StringMap<string, any> {
  return serializeEvent(e, MOUSE_EVENT_PROPERTIES);
}

export function serializeKeyboardEvent(e: KeyboardEvent): StringMap<string, any> {
  var serializedEvent = serializeEvent(e, KEYBOARD_EVENT_PROPERTIES);
  return addTarget(e, serializedEvent);
}

// TODO(jteplitz602): #3374. See above.
function addTarget(e: Event, serializedEvent: StringMap<string, any>): StringMap<string, any> {
  if (NODES_WITH_VALUE.has((<HTMLElement>e.target).tagName.toLowerCase())) {
    var target = <HTMLInputElement>e.target;
    serializedEvent['target'] = {'value': target.value};
    if (isPresent(target.files)) {
      serializedEvent['target']['files'] = target.files;
    }
  }
  return serializedEvent;
}

function serializeEvent(e: any, properties: string[]): StringMap<string, any> {
  var serialized = {};
  for (var i = 0; i < properties.length; i++) {
    var prop = properties[i];
    serialized[prop] = e[prop];
  }
  return serialized;
}