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import document from "document";
import { HeartRateSensor } from "heart-rate";
import { display } from "display";
import { me } from "appbit";
import * as util from "./utils";
var hrImage = document.getElementById("hrImage");
var hrIcon = document.getElementById("hrIcon");
let hr1 = document.getElementById("hr1");
let hr2 = document.getElementById("hr2");
let hr3 = document.getElementById("hr3");
var hrm = null;
var lastMeasuredHR = 0;
var timeOfLastMeasuredHR = 0;
var lastHRMReading = 0;
var hrmActive = false;
var hrTimer = null;
function getHRMReading() {
let timeToNextReading = 1000; //check every second even when no HR is detected
let now = new Date().getTime();
let hr = hrm.heartRate;
if (hrm.timestamp === lastHRMReading || !hr) {
if (now - timeOfLastMeasuredHR >= 3000) {
//more then 3 seconds no new HR reading, watch probably off wrist
if (hrmActive) {
//show as not active
hrmActive = false;
setHRIconColor();
showHRMValue("---");
}
}
else {
//no new reading, but less then 3 seconds ago we still had a valid reading, so keep animating at same speed
timeToNextReading = 60000/lastMeasuredHR;
}
} else {
//new reading
if (!hrmActive) {
hrmActive = true;
setHRIconColor();
}
//store last measured to use when we get no new readings next time
timeOfLastMeasuredHR = now;
lastMeasuredHR = hr;
showHRMValue(lastMeasuredHR);
timeToNextReading = 60000/lastMeasuredHR;
}
lastHRMReading = hrm.timestamp;
//animate when active
if (hrmActive) {
hrImage.animate("enable");
}
//set next reading timeout depending on HR
if (hrTimer) {
clearTimeout(hrTimer);
hrTimer = null;
}
hrTimer = setTimeout(getHRMReading, timeToNextReading);
}
function setHRIconColor() {
if (hrmActive) {
hrIcon.style.fill = "#FF0000";
}
else {
hrImage.animate("disable");
hrIcon.style.fill = "#ffffff";
}
}
function showHRMValue(newHRMValue) {
let digits = [hr1, hr2, hr3];
let lastNonZeroIndex = 3;
for (let i = 2; i >= 0; i--) {
var digit;
if (newHRMValue === "---")
{
digit = "-";
}
else {
digit = newHRMValue % 10;
newHRMValue = Math.floor(newHRMValue / 10);
}
if (digit != 0) {
lastNonZeroIndex = i;
}
util.drawDigit(digit, digits[i]);
digits[i].style.opacity = 1;
}
// Darken leading zeroes
for (let i = 0; i < lastNonZeroIndex; i++)
{
digits[i].style.opacity = 0.2;
}
}
function startHRMeasurements() {
if (hrm) {
if (hrmActive) {
timeOfLastMeasuredHR = new Date().getTime(); //make sure the icon doesn't show as gray after the screen was off a long time
}
hrm.start();
getHRMReading();
}
}
function stopHRMeasurements() {
if (hrTimer) {
clearTimeout(hrTimer);
hrTimer = null;
}
if (hrm) {
hrm.stop();
}
}
export function initialize() {
showHRMValue('---');
if (me.permissions.granted("access_heart_rate")) {
hrm = new HeartRateSensor();
if (display.on) {
//already start measurements
startHRMeasurements();
}
}
//react on display on/off
display.onchange = function() {
if (display.on) {
startHRMeasurements();
} else {
stopHRMeasurements();
}
}
}
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