widgetUtils

'use strict';
var $ = require('jquery');
var $osf = require('js/osfHelpers');

var widgetUtils = {};

/**
 * Return time since epoch (ms) in human readable format
 *
 * @param {string} timeSinceEpochInMs: the time since epoch in ms
 * @return {string} human readable date
 */
widgetUtils.timeSinceEpochInMsToMMYY = function(timeSinceEpochInMs) {
    var d = new Date(timeSinceEpochInMs);
    return (d.getDate()+1).toString() + '/' + (d.getMonth()+1).toString() + '/' + d.getFullYear().toString().substring(2);
};

/**
 * Checks if an update has been requested for this widget. THIS IS NOT A PURE FUNCTION: vm.widgetsToUpdate is modified
 *
 * @param {string} widgetName: name of widget to check
 * @param {object} vm: searchDashboard vm containing a list of widgets that need to be updated (vm.widgetsToUpdate)
 * @return {bool}  returns true if it has, false if not.
 */
widgetUtils.updateTriggered = function(widgetName, vm){
    if (vm.widgetsToUpdate.indexOf(widgetName) === -1){
        return false;
    }
    vm.widgetsToUpdate.splice($.inArray(widgetName, vm.widgetsToUpdate), 1); //signal that this widget has been redrawn
    return true;
};

/**
 * Adds the widget to the list of widgets that need to be updated (will actually update at next redraw)
 *
 * @param {Object} vm: searchDashboard vm containing a list of widgets that need to be updated (vm.widgetsToUpdate)
 * @param {Array} widgetsToAdd: list of widgets that need to be added to the list of widgets to update
 */
widgetUtils.signalWidgetsToUpdate = function(vm, widgetsToAdd){
    if ($.inArray('all', widgetsToAdd) > -1){
        vm.widgetsToUpdate = widgetUtils.concatUnique(vm.widgetsToUpdate, vm.widgetIds);
        return;
    }
    vm.widgetsToUpdate = widgetUtils.concatUnique(vm.widgetsToUpdate, widgetsToAdd);
};

/**
 * Concatenates too arrays and removes non-unique values
 *
 * @param {Array} array1: array to add to
 * @param {Array} array2: array to add
 * @return {Bool}  concatenation of the unique values of the two arrays
 */
widgetUtils.concatUnique = function(array1, array2){
     var temp = array1.concat(array2);
     return temp.filter(function(item, i, arr){ return arr.indexOf(item) === i; }); //make unique so we dont redraw widgets more than we have to
};

/**
 * Finds and returns the keys not present in an object.
 *
 * @param {array} keys: an array of keys to check against
 * @param {object} object: The object to search through
 * @return {array}  Missing keys from object, returns [] if nothing missing
 */
widgetUtils.keysNotInObject = function(keys, object){
    return $.map(keys, function(key){
        if (object[key] === undefined){
            return key;
        }
    });
};

/**
 * finds and returns and object from a list of objects whose id matches the given id.
 *
 * @param {array} listOfObjects: A array containing a set of objects to match the ide feild with
 * @param {string} id: The id to match
 * @return {Object}  matched object
 */
widgetUtils.getObjectById = function(listOfObjects, id, field){
    field = field || 'id';
    var obIndex = $.map(listOfObjects, function(obj, index) {
        if (obj[field] === id) {
            return index;
        }
    });
    return listOfObjects[obIndex];
};

/**
 * Get the key of the object whose value matches given value
 *
 * @param {Object} object: Object to search through
 * @param {string/int} value: value to match to
 * @return {Object}  matched object
 */
widgetUtils.getKeyFromValue = function(object, value){
  var key;
  for(key in object){
    if(object[key] === value){
      return key;
    }
  }
  return null;
};

module.exports = widgetUtils;