arcade-popup-user-units

// removes nulls and if present
Expects($feature,'*')

// define necessary variables
var fields = Schema($feature).fields
var uPortal = Portal('https://www.arcgis.com')
var currUser = GetUser(uPortal)
var defaultDist = 'metric'
var defaultDistUnit = 'm'
var altDistUnit = 'ft'
var defaultSpeed = 'metric'
var defaultSpeedUnit = 'm/s'
var altSpeedUnit = ' mph'
var DistFieldNames = ['diameter','hubHeight']
var SpeedFieldNames = ['cutInSpeed','cutOutSpeed','ratedSpeed']
var uUnits = 'unknown'

// if the user is not signed in, than use 'unknown' as the units, otherwise use the users units
if (!IsEmpty(currUser)) {
	uUnits = currUser.units
}

// returns the names of the attributes
function getNames(field){
	return field.name
}

// creates a Dictionary with metadata to each attribute
function getFieldsMetaData() {
	var field_meta = {}
	for (var f in fields) {
		field_meta[fields[f].name] = {
			"alias": fields[f].alias,
			"domain": HasKey(fields[f], "domain"),
			"fieldType": fields[f].type,
			"name": fields[f].name
		}
	}
	return field_meta
}

// formats the attributes including speed and distance information and converts them if the user units are not the default ones
function formatField(fieldMetaData) {
	if (uUnits == 'unknown') {
		return Round($feature[fieldMetaData.name],1)
	} else {
		var isDist = Includes(DistFieldNames, fieldMetaData.name)
		var isSpeed = Includes(SpeedFieldNames, fieldMetaData.name)
		if (isDist){
			if (uUnits == defaultDist) {
				return Round($feature[fieldMetaData.name],1) + ' ' + defaultDistUnit
			} else {
				var convtoFt = $feature[fieldMetaData.name] * 3.28084
				return Round(convtoFt,1) + ' ' + altDistUnit
			}
		}
		if (isSpeed) {
			if (uUnits == defaultSpeed) {
				return Round($feature[fieldMetaData.name], 1) + ' ' + defaultSpeedUnit
			} else {
				var convtomph = $feature[fieldMetaData.name] * 2.236936
				return Round(convtomph,1) + ' ' + altSpeedUnit
			}
		}
	}
}

// returns the attributes that include info about distance or speed and are not empty nor null
function filterValidFields(fieldName){
	var includesNames = Splice(DistFieldNames,SpeedFieldNames)
	return includes(includesNames, fieldName) && !IsEmpty($feature[fieldName]) && !IsNan($feature[fieldName])
}

// pushes the potentially converted attribute values and their field names into the needed Dictionary and Array for the output
var validFields = Filter(Map(fields, getNames), filterValidFields)
var attributes = {}
var fieldInfos = []
var fieldMetaInfo = getFieldsMetaData()
for (var f in validFields){
	var fieldName = validFields[f]
	var fieldMeta = fieldMetaInfo[fieldName]
	var fieldAlias = fieldMeta.alias
	var fieldAliasNeat = fieldAlias
	if (uUnits != 'unknown') {
		fieldAliasNeat = trim(left(fieldAlias,find("[", fieldAlias,0)))
	}
	Push(fieldInfos, {fieldName: fieldAliasNeat})
	attributes[fieldAliasNeat] = formatField(fieldMeta)
}

// returns the actual table for the popup
return {
	title: "Wind Energy Turbine Specifications",
	description: "Detailed Info about the Wind Energy Turbine",
	type: "fields",
	fieldInfos: fieldInfos,
	attributes: attributes
}