fix: midnight roll (#484)

* refactor: extract utilities and types

* refactor: extract and simplify progress bar logic

* refactor: duration validation handles midnight

* fix: prevent stale event loader

* refactor: consider next event in timer invalidation

* refactor: reload changes on changed roll target

* refactor: timer load accounts for midnight

* fix: issues with midnight on roll

* refactor: prevent stale secondary event

apps/server/src/services/timerUtils.ts

@@ -1,4 +1,5 @@
-type MaybeNumber = number | null;
+import { MaybeNumber } from 'ontime-types';
+import { dayInMs } from 'ontime-utils';
 
 /**
  * Calculates expected finish time of a running timer
@@ -18,7 +19,14 @@ export function getExpectedFinish(
     return finishedAt;
   }
 
-  return Math.max(startedAt + duration + pausedTime + addedTime, startedAt);
+  // handle events that finish the day after
+  const expectedFinish = startedAt + duration + pausedTime + addedTime;
+  if (expectedFinish > dayInMs) {
+    return expectedFinish - dayInMs;
+  }
+
+  // an event cannot finish before it started (user added too much negative time)
+  return Math.max(expectedFinish, startedAt);
 }
 
 /**
@@ -34,15 +42,23 @@ export function getCurrent(
   if (startedAt === null) {
     return null;
   }
+  if (startedAt > clock) {
+    return startedAt + duration + addedTime + pausedTime - clock - dayInMs;
+  }
   return startedAt + duration + addedTime + pausedTime - clock;
 }
 
 /**
  * Calculates elapsed time
  */
-export function getElapsed(startedAt: number, clock: number) {
+export function getElapsed(startedAt: number | null, clock: number): number | null {
+  if (startedAt === null) {
+    return null;
+  }
+
+  // we are in the day after
   if (startedAt > clock) {
-    throw new Error('clock cannot be higher than startedAt');
+    return dayInMs - startedAt + clock;
   }
   return clock - startedAt;
 }