Away setback

const definition = {
  name: 'Away Setback',
  namespace: 'com.example',
  description: 'Sets the thermostat back when everyone leaves and restores it when someone comes home.',
  category: 'climate',
};

const preferences = {
  pages: [{
    id: 'main',
    title: 'Away Setback',
    inputs: [
      { key: 'thermostat', label: 'Thermostat', type: 'entity', domainFilter: 'climate', required: true },
      { key: 'awayAfterMinutes', label: 'Wait after the last person leaves (minutes)',
        type: 'number', default: 15, minValue: 0, maxValue: 180 },
      { key: 'awayHeat', label: 'Away heating setpoint', type: 'number', required: true,
        description: "In the home's temperature unit." },
      { key: 'awayCool', label: 'Away cooling setpoint', type: 'number', required: true },
      { key: 'homeHeat', label: 'Home heating setpoint', type: 'number', required: true },
      { key: 'homeCool', label: 'Home cooling setpoint', type: 'number', required: true },
    ],
  }],
};

function installed() { initialize(); }
function updated() { unsubscribe(); unschedule(); initialize(); }

function initialize() {
  const household = new EntityWrapper('system.group_presence');   // on = someone is home
  subscribe(household, { to: 'Not Present' }, onEveryoneLeft);
  subscribe(household, { to: 'Present' }, onSomeoneHome);
}

function onEveryoneLeft() {
  const minutes = typeof awayAfterMinutes === 'number' && awayAfterMinutes >= 0 ? awayAfterMinutes : 15;
  runIn(minutes * 60, applyAway);                 // a quick return cancels this in onSomeoneHome
}

function onSomeoneHome() {
  unschedule(applyAway);
  if (state.away === true) applyHome();           // only restore if we actually set back
}

function applyAway() {
  state.away = true;
  applySetpoint(awayHeat, awayCool);
}

function applyHome() {
  state.away = false;
  applySetpoint(homeHeat, homeCool);
}

// A thermostat reports the leg it is driving, `heat` or `cool`; pick the matching setpoint.
function applySetpoint(heat, cool) {
  const mode = thermostat.getState();
  const target = mode === 'cool' ? cool : mode === 'heat' ? heat : null;
  if (typeof target !== 'number') {
    console.log(`Thermostat is ${mode}; nothing to set`);
    return;
  }
  thermostat.setTemperature({ temperature: target });
  const unit = getUnitPreferences().temperatureScale;
  console.log(`${state.away ? 'Away' : 'Home'}: ${mode} setpoint set to ${target}${unit}`);
}

function run() {                                   // Run button: flip between the two, handy for testing
  if (state.away === true) applyHome();
  else applyAway();
}