Change the timer data structure to fix network bugs and refactored shared timer functions

src/helpers/timer.js

@@ -0,0 +1,33 @@
+const MILLISECONDS_IN_HOUR = 3600000;
+const MILLISECONDS_IN_MINUTE = 60000;
+const MILLISECONDS_IN_SECOND = 1000;
+
+/**
+ * Returns a timers duration in milliseconds
+ * @param {Object} t The object with an hour, minute and second property
+ */
+export function getHMSDuration(t) {
+  if (!t) {
+    return 0;
+  }
+  return (
+    t.hour * MILLISECONDS_IN_HOUR +
+    t.minute * MILLISECONDS_IN_MINUTE +
+    t.second * MILLISECONDS_IN_SECOND
+  );
+}
+
+/**
+ * Returns an object with an hour, minute and second property
+ * @param {number} duration The duration in milliseconds
+ */
+export function getDurationHMS(duration) {
+  let workingDuration = duration;
+  const hour = Math.floor(workingDuration / MILLISECONDS_IN_HOUR);
+  workingDuration -= hour * MILLISECONDS_IN_HOUR;
+  const minute = Math.floor(workingDuration / MILLISECONDS_IN_MINUTE);
+  workingDuration -= minute * MILLISECONDS_IN_MINUTE;
+  const second = Math.floor(workingDuration / MILLISECONDS_IN_SECOND);
+
+  return { hour, minute, second };
+}