// Return an array of all alarms
exports.getAlarms = function() {
  return require("Storage").readJSON("alarm.json",1)||[];
};
// Return an alarm object based on ID
exports.getAlarm = function(id) {
  var alarms = require("Storage").readJSON("alarm.json",1)||[];
  return alarms.find(a=>a.id==id);
};
// Set an alarm object based on ID. Leave 'alarm' undefined to remove it
exports.setAlarm = function(id, alarm) {
  var alarms = require("Storage").readJSON("alarm.json",1)||[];
  alarms = alarms.filter(a=>a.id!=id);
  if (alarm !== undefined) {
    alarm.id = id;
    if (alarm.dow===undefined) alarm.dow = 0b1111111;
    if (alarm.on!==false) alarm.on=true;
    if (alarm.timer) { // if it's a timer, set the start time as a time from *now*
      var time = new Date();
      var currentTime = (time.getHours()*3600000)+(time.getMinutes()*60000)+(time.getSeconds()*1000);
      alarm.t = currentTime + alarm.timer;
    }
  }
  alarms.push(alarm);
  require("Storage").writeJSON("alarm.json", alarms);
};
/// Get time until the given alarm (object). Return undefined if alarm not enabled, or if 86400000 or more, alarm could me *more* than a day in the future
exports.getTimeToAlarm = function(alarm, time) {
  if (!alarm) return undefined;
  if (!time) time = new Date();
  var active = alarm.on && (alarm.dow>>time.getDay())&1;
  if (!active) return undefined;
  var currentTime = (time.getHours()*3600000)+(time.getMinutes()*60000)+(time.getSeconds()*1000);
  var t = alarm.t-currentTime;
  if (alarm.last == time.getDate() || t < -60000) t += 86400000;
  return t;
};
/// Force a reload of the current alarms and widget
exports.reload = function() {
  eval(require("Storage").read("alarm.boot.js"));
  if (WIDGETS["alarm"]) {
    WIDGETS["alarm"].reload();
    Bangle.drawWidgets();
  }
};