refactor: timer update

apps/server/src/services/TimerService.ts

@@ -4,6 +4,8 @@ import * as runtimeState from '../stores/runtimeState.js';
 import type { UpdateResult } from '../stores/runtimeState.js';
 import { timerConfig } from '../config/config.js';
 
+type UpdateCallbackFn = (updateResult: UpdateResult) => void;
+
 /**
  * Service manages Ontime's main timer
  */
@@ -13,9 +15,9 @@ export class TimerService {
   static _refreshInterval: number;
 
   /** when timer will be finished */
-  private endCallback: NodeJS.Timeout;
+  private endCallback: NodeJS.Timeout | undefined = undefined;
 
-  private onUpdateCallback: (updateResult: UpdateResult) => void;
+  private onUpdateCallback: UpdateCallbackFn | undefined = undefined;
 
   /**
    * @constructor
@@ -23,19 +25,21 @@ export class TimerService {
    * @param {number} [timerConfig.updateInterval] how often we update the socket
    * @param {function} [timerConfig.onUpdateCallback] how often we update the socket
    */
-  constructor(timerConfig: {
-    refresh: number;
-    updateInterval: number;
-    onUpdateCallback: (updateResult: UpdateResult) => void;
-  }) {
+  constructor(timerConfig: { refresh: number; updateInterval: number }) {
     TimerService._refreshInterval = timerConfig.refresh;
-
-    this.onUpdateCallback = timerConfig.onUpdateCallback;
     this._interval = setInterval(() => {
       this.update();
     }, TimerService._refreshInterval);
   }
 
+  /**
+   * Allows setting a callback for when the timer updates
+   * @param callback
+   */
+  setOnUpdateCallback(callback: (updateResult: UpdateResult) => void) {
+    this.onUpdateCallback = callback;
+  }
+
   start() {
     if (!runtimeState.start()) {
       return false;
@@ -79,6 +83,12 @@ export class TimerService {
     // renew end callback
     clearTimeout(this.endCallback);
     const state = runtimeState.getState();
+    // eslint-disable-next-line no-unused-labels -- dev code path
+    DEV: {
+      if (state.timer.expectedFinish === null) {
+        throw new Error('TimerService.addTime: expectedFinish is negative');
+      }
+    }
     this.endCallback = setTimeout(() => this.update(), state.timer.expectedFinish);
     return true;
   }
@@ -89,7 +99,7 @@ export class TimerService {
   update() {
     const updateResult = runtimeState.update();
     // pass the result to the parent
-    this.onUpdateCallback(updateResult);
+    this.onUpdateCallback?.(updateResult);
   }
 
   /**

apps/server/src/services/__tests__/timerUtils.test.ts

@@ -10,7 +10,6 @@ import {
   getTotalDuration,
   normaliseEndTime,
   skippedOutOfEvent,
-  updateRoll,
 } from '../timerUtils.js';
 import { RuntimeState } from '../../stores/runtimeState.js';
 
@@ -1237,196 +1236,6 @@ test('normaliseEndTime()', () => {
   expect(normaliseEndTime(t3.start, t3.end)).toBe(t3_expected);
 });
 
-describe('updateRoll()', () => {
-  it('it updates running events correctly', () => {
-    const timers = {
-      eventNow: {
-        id: '1',
-      },
-      clock: 11,
-      timer: {
-        current: 10,
-        expectedFinish: 100,
-        secondaryTimer: null,
-        startedAt: 1,
-      },
-      _timer: {
-        secondaryTarget: null,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: 100 - 11,
-      updatedSecondaryTimer: null, // usually clock - expectedFinish
-      doRollLoad: false,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-
-    // test that it can jump time
-    timers.timer.expectedFinish = 1000;
-    timers.clock = 600;
-    expected.updatedTimer = 1000 - 600;
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('it updates secondary timer', () => {
-    const timers = {
-      eventNow: null,
-      clock: 11,
-      timer: {
-        current: null,
-        expectedFinish: null,
-        secondaryTimer: 1,
-      },
-      _timer: {
-        secondaryTarget: 15,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: null,
-      updatedSecondaryTimer: 15 - 11, // countdown to secondary
-      doRollLoad: false,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('flags an event end', () => {
-    const timers = {
-      eventNow: {
-        id: '1',
-      },
-      clock: 12,
-      timer: {
-        startedAt: 0,
-        current: 10,
-        expectedFinish: 11,
-        secondaryTimer: null,
-      },
-      _timer: {
-        secondaryTarget: null,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: -1,
-      updatedSecondaryTimer: null,
-      doRollLoad: true,
-      isFinished: true,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('secondary events do not trigger event ends', () => {
-    const timers = {
-      eventNow: null,
-      clock: 16,
-      timer: {
-        startedAt: null,
-        current: null,
-        expectedFinish: null,
-        secondaryTimer: 1,
-      },
-      _timer: {
-        secondaryTarget: 15,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: null,
-      updatedSecondaryTimer: -1,
-      doRollLoad: true,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('when a secondary timer is finished, it prompts for new event load', () => {
-    const timers = {
-      eventNow: null,
-      clock: 15,
-      timer: {
-        current: null,
-        expectedFinish: null,
-        secondaryTimer: 0,
-      },
-      _timer: {
-        secondaryTarget: 15,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: null,
-      updatedSecondaryTimer: 0,
-      doRollLoad: true,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('counts over midnight', () => {
-    const timers = {
-      eventNow: {
-        id: '1',
-      },
-      clock: dayInMs - 10,
-      timer: {
-        current: 25,
-        expectedFinish: 10,
-        startedAt: 1000,
-        secondaryTimer: null,
-      },
-      _timer: {
-        secondaryTarget: null,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: 20,
-      updatedSecondaryTimer: null,
-      doRollLoad: false,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-
-  it('rolls over midnight', () => {
-    const timers = {
-      eventNow: {
-        id: '1',
-      },
-      clock: 10,
-      timer: {
-        current: dayInMs,
-        expectedFinish: 10,
-        startedAt: 1000,
-        secondaryTimer: null,
-      },
-      _timer: {
-        secondaryTarget: null,
-      },
-    } as RuntimeState;
-
-    const expected = {
-      updatedTimer: dayInMs,
-      updatedSecondaryTimer: null,
-      doRollLoad: false,
-      isFinished: false,
-    };
-
-    expect(updateRoll(timers)).toStrictEqual(expected);
-  });
-});
-
 describe('getRuntimeOffset()', () => {
   it('is the difference between scheduled and when we actually started', () => {
     const state = {
@@ -1554,7 +1363,7 @@ describe('getRuntimeOffset()', () => {
         secondaryTimer: null,
         startedAt: null,
       },
-      _timer: { pausedAt: null, secondaryTarget: null },
+      _timer: { pausedAt: null },
     } as RuntimeState;
 
     const offset = getRuntimeOffset(state);
@@ -1595,7 +1404,7 @@ describe('getRuntimeOffset()', () => {
         secondaryTimer: null,
         startedAt: null,
       },
-      _timer: { pausedAt: null, secondaryTarget: null },
+      _timer: { pausedAt: null },
     } as RuntimeState;
 
     const offset = getRuntimeOffset(state);
@@ -1630,7 +1439,7 @@ describe('getRuntimeOffset()', () => {
       runtime: {
         selectedEventIndex: 0,
         numEvents: 1,
-        offset: null,
+        offset: 0,
         plannedStart: 77400000, // 21:30:00
         plannedEnd: 81000000, // 22:30:00
         actualStart: 78000000, // 21:40:00
@@ -1647,7 +1456,7 @@ describe('getRuntimeOffset()', () => {
         secondaryTimer: null,
         startedAt: 78000000,
       },
-      _timer: { pausedAt: null, secondaryTarget: null },
+      _timer: { pausedAt: null },
     } as RuntimeState;
 
     const offset = getRuntimeOffset(state);
@@ -1682,7 +1491,7 @@ describe('getRuntimeOffset()', () => {
       runtime: {
         selectedEventIndex: 0,
         numEvents: 1,
-        offset: null,
+        offset: 0,
         plannedStart: 77400000, // 21:30:00
         plannedEnd: 81000000, // 22:30:00
         actualStart: 78000000, // 21:40:00
@@ -1699,7 +1508,7 @@ describe('getRuntimeOffset()', () => {
         secondaryTimer: null,
         startedAt: 78000000,
       },
-      _timer: { pausedAt: null, secondaryTarget: null },
+      _timer: { pausedAt: null },
     } as RuntimeState;
 
     const offset = getRuntimeOffset(state);
@@ -1722,7 +1531,7 @@ describe('getRuntimeOffset()', () => {
       runtime: {
         selectedEventIndex: 0,
         numEvents: 1,
-        offset: null,
+        offset: 0,
         plannedStart: 77400000, // 21:30:00
         plannedEnd: 81000000, // 22:30:00
         actualStart: 82000000, // 22:46:40 <--- started now
@@ -1739,7 +1548,7 @@ describe('getRuntimeOffset()', () => {
         secondaryTimer: null,
         startedAt: 82000000, // <--- started now
       },
-      _timer: { pausedAt: null, secondaryTarget: null },
+      _timer: { pausedAt: null },
     } as RuntimeState;
 
     const updateCurrent = getCurrent(state);
@@ -1887,7 +1696,7 @@ describe('getTimerPhase()', () => {
       runtime: {
         selectedEventIndex: null,
         numEvents: 1,
-        offset: null,
+        offset: 0,
         plannedStart: 55860000,
         plannedEnd: 55880000,
         actualStart: null,
@@ -1909,7 +1718,6 @@ describe('getTimerPhase()', () => {
         forceFinish: null,
         totalDelay: 0,
         pausedAt: null,
-        secondaryTarget: 55860000,
       },
     } as RuntimeState;
 
@@ -1927,7 +1735,7 @@ describe('getTimerPhase()', () => {
       runtime: {
         selectedEventIndex: null,
         numEvents: 1,
-        offset: null,
+        offset: 0,
         plannedStart: 55860000,
         plannedEnd: 55880000,
         actualStart: null,
@@ -1949,7 +1757,6 @@ describe('getTimerPhase()', () => {
         forceFinish: null,
         totalDelay: 0,
         pausedAt: null,
-        secondaryTarget: 55860000,
       },
     } as RuntimeState;
 

apps/server/src/services/runtime-service/RuntimeService.ts

@@ -29,7 +29,9 @@ import {
   getEventWithId,
   getPlayableEvents,
 } from '../rundown-service/rundownUtils.js';
+import { skippedOutOfEvent } from '../timerUtils.js';
 import { integrationService } from '../integration-service/IntegrationService.js';
+
 import { getForceUpdate, getShouldClockUpdate, getShouldTimerUpdate } from './rundownService.utils.js';
 
 /**
@@ -37,18 +39,21 @@ import { getForceUpdate, getShouldClockUpdate, getShouldTimerUpdate } from './ru
  * Coordinating with necessary services
  */
 class RuntimeService {
-  private eventTimer: TimerService | null = null;
+  private eventTimer: TimerService;
   private lastIntegrationClockUpdate = -1;
   private lastIntegrationTimerValue = -1;
 
   /** last time we updated the socket */
   static previousTimerUpdate: number;
-  static previousTimerValue: MaybeNumber;
+  static previousTimerValue: MaybeNumber; // previous timer value, could be null
   static previousClockUpdate: number;
+
   /** last known state */
   static previousState: RuntimeState;
 
-  constructor() {
+  constructor(timerService: TimerService) {
+    this.eventTimer = timerService;
+
     RuntimeService.previousTimerUpdate = -1;
     RuntimeService.previousTimerValue = -1;
     RuntimeService.previousClockUpdate = -1;
@@ -59,7 +64,45 @@ class RuntimeService {
   @broadcastResult
   checkTimerUpdate({ shouldCallRoll, hasTimerFinished }: runtimeState.UpdateResult) {
     const newState = runtimeState.getState();
-    if (hasTimerFinished) {
+
+    // 1. find if we need to dispatch integrations related to the phase
+    const timerPhaseChanged = RuntimeService.previousState.timer?.phase !== newState.timer.phase;
+    if (timerPhaseChanged) {
+      if (newState.timer.phase === TimerPhase.Warning) {
+        process.nextTick(() => {
+          integrationService.dispatch(TimerLifeCycle.onWarning);
+        });
+      } else if (newState.timer.phase === TimerPhase.Danger) {
+        process.nextTick(() => {
+          integrationService.dispatch(TimerLifeCycle.onDanger);
+        });
+      }
+    }
+
+    // 2. handle edge cases related to roll
+    if (newState.timer.playback === Playback.Roll) {
+      // check if we need to call roll again
+      const needsEvent =
+        newState.eventNow === null
+          ? true
+          : skippedOutOfEvent(newState, this.lastIntegrationClockUpdate, timerConfig.skipLimit);
+      const hasFinishedRoll = hasTimerFinished && shouldCallRoll;
+      if (shouldCallRoll || needsEvent) {
+        if (hasFinishedRoll) {
+          process.nextTick(() => {
+            integrationService.dispatch(TimerLifeCycle.onFinish);
+          });
+        }
+
+        // we dont call this.roll because we need to bypass the checks
+        const rundown = getPlayableEvents();
+        // TODO: by not calling roll, we dont get the events
+        this.eventTimer.roll(rundown);
+      }
+    }
+
+    // 3. find if we need to process actions related to the timer finishing
+    if (newState.timer.playback !== Playback.Roll && hasTimerFinished) {
       process.nextTick(() => {
         integrationService.dispatch(TimerLifeCycle.onFinish);
       });
@@ -77,10 +120,8 @@ class RuntimeService {
       }
     }
 
-    const hasRunningTimer = Boolean(newState.eventNow) && newState.timer.playback === Playback.Play;
-    const shouldUpdateTimer =
-      hasRunningTimer && getShouldTimerUpdate(this.lastIntegrationTimerValue, newState.timer.current);
-
+    // 4. find if we need to update the timer
+    const shouldUpdateTimer = getShouldTimerUpdate(this.lastIntegrationTimerValue, newState.timer.current);
     if (shouldUpdateTimer) {
       process.nextTick(() => {
         integrationService.dispatch(TimerLifeCycle.onUpdate);
@@ -89,6 +130,7 @@ class RuntimeService {
       this.lastIntegrationTimerValue = newState.timer.current ?? -1;
     }
 
+    // 5. find if we need to update the clock
     const shouldUpdateClock = getShouldClockUpdate(this.lastIntegrationClockUpdate, newState.clock);
     if (shouldUpdateClock) {
       process.nextTick(() => {
@@ -97,42 +139,12 @@ class RuntimeService {
 
       this.lastIntegrationClockUpdate = newState.clock;
     }
-
-    if (shouldCallRoll) {
-      // we dont call this.roll because we need to bypass the checks
-      const rundown = getPlayableEvents();
-      this.eventTimer.roll(rundown);
-    }
-
-    const timerPhaseChanged = RuntimeService.previousState.timer?.phase !== newState.timer.phase;
-
-    if (timerPhaseChanged) {
-      switch (newState.timer.phase) {
-        case TimerPhase.Warning:
-          process.nextTick(() => {
-            integrationService.dispatch(TimerLifeCycle.onWarning);
-          });
-          break;
-        case TimerPhase.Danger:
-          process.nextTick(() => {
-            integrationService.dispatch(TimerLifeCycle.onDanger);
-          });
-          break;
-        default:
-          break;
-      }
-    }
   }
 
   /** delay initialisation until we have a restore point */
   init(resumable: RestorePoint | null) {
     logger.info(LogOrigin.Server, 'Runtime service started');
-    // calculate at 30fps, refresh at 1fps
-    this.eventTimer = new TimerService({
-      refresh: timerConfig.updateRate,
-      updateInterval: timerConfig.notificationRate,
-      onUpdateCallback: (updateResult) => this.checkTimerUpdate(updateResult),
-    });
+    this.eventTimer.setOnUpdateCallback((updateResult) => this.checkTimerUpdate(updateResult));
 
     if (resumable) {
       this.resume(resumable);
@@ -553,8 +565,16 @@ class RuntimeService {
   }
 }
 
-export const runtimeService = new RuntimeService();
+// calculate at 30fps, refresh at 1fps
+const eventTimer = new TimerService({
+  refresh: timerConfig.updateRate,
+  updateInterval: timerConfig.notificationRate,
+});
+export const runtimeService = new RuntimeService(eventTimer);
 
+/**
+ * Decorator manages side effects from updating the runtime
+ */
 function broadcastResult(_target: any, _propertyKey: string, descriptor: PropertyDescriptor) {
   const originalMethod = descriptor.value;
 

apps/server/src/services/timerUtils.ts

@@ -1,7 +1,6 @@
 import { MaybeNumber, MaybeString, OntimeEvent, Playback, TimerPhase, TimerType } from 'ontime-types';
 import { dayInMs } from 'ontime-utils';
 import { RuntimeState } from '../stores/runtimeState.js';
-import { timerConfig } from '../config/config.js';
 
 /**
  * handle events that span over midnight
@@ -56,6 +55,12 @@ export function getExpectedFinish(state: RuntimeState): MaybeNumber {
  */
 
 export function getCurrent(state: RuntimeState): number {
+  // eslint-disable-next-line no-unused-labels -- dev code path
+  DEV: {
+    if (state.eventNow === null || state.timer.duration === null) {
+      throw new Error('timerUtils.getCurrent: invalid state received');
+    }
+  }
   const { startedAt, duration, addedTime } = state.timer;
   const { timerType, timeStart, timeEnd } = state.eventNow;
   const { pausedAt } = state._timer;
@@ -88,6 +93,12 @@ export function getCurrent(state: RuntimeState): number {
  * @returns {boolean}
  */
 export function skippedOutOfEvent(state: RuntimeState, previousTime: number, skipLimit: number): boolean {
+  // eslint-disable-next-line no-unused-labels -- dev code path
+  DEV: {
+    if (state.timer.expectedFinish === null || state.timer.startedAt === null) {
+      throw new Error('timerUtils.skippedOutOfEvent: invalid state received');
+    }
+  }
   const { startedAt, expectedFinish } = state.timer;
   const { clock } = state;
 
@@ -246,54 +257,6 @@ export const getRollTimers = (rundown: OntimeEvent[], timeNow: number, currentIn
   };
 };
 
-/**
- * @description Implements update functions for roll mode
- * @param {RuntimeState}
- * @returns object with selection variables
- */
-export const updateRoll = (state: RuntimeState) => {
-  const { current, expectedFinish, startedAt, secondaryTimer } = state.timer;
-  const { secondaryTarget } = state._timer;
-  const { clock } = state;
-  const selectedEventId = state.eventNow?.id ?? null;
-
-  // timers
-  let updatedTimer = current;
-  let updatedSecondaryTimer = secondaryTimer;
-  // whether rollLoad should be called: force reload of events
-  let doRollLoad = false;
-  // whether finished event should trigger
-  let isPrimaryFinished = false;
-
-  if (selectedEventId && current !== null) {
-    // if we have something selected and a timer, we are running
-
-    const finishAt = expectedFinish >= startedAt ? expectedFinish : expectedFinish + dayInMs;
-    updatedTimer = finishAt - clock;
-
-    if (updatedTimer > dayInMs) {
-      updatedTimer -= dayInMs;
-    }
-
-    if (updatedTimer <= timerConfig.triggerAhead) {
-      isPrimaryFinished = true;
-      // we need a new event
-      doRollLoad = true;
-    }
-  } else if (secondaryTimer >= 0) {
-    // if secondaryTimer is running we are in waiting to roll
-
-    updatedSecondaryTimer = secondaryTarget - clock;
-
-    if (updatedSecondaryTimer <= 0) {
-      // we need a new event
-      doRollLoad = true;
-    }
-  }
-
-  return { updatedTimer, updatedSecondaryTimer, doRollLoad, isFinished: isPrimaryFinished };
-};
-
 /**
  * Calculates difference between the runtime and the schedule of an event
  * Positive offset is time ahead
@@ -305,6 +268,14 @@ export function getRuntimeOffset(state: RuntimeState): number {
     return 0;
   }
 
+  // eslint-disable-next-line no-unused-labels -- dev code path
+  DEV: {
+    // we know current exists as long as eventNow exists
+    if (state.timer.current === null) {
+      throw new Error('timerUtils.calculate: current must be set');
+    }
+  }
+
   const { clock } = state;
   const { timeStart, timerType } = state.eventNow;
   const { addedTime, current, startedAt } = state.timer;
@@ -356,7 +327,7 @@ export function getTotalDuration(firstStart: number, lastEnd: number, daySpan: n
  */
 export function getExpectedEnd(state: RuntimeState): MaybeNumber {
   // there is no expected end if we havent started
-  if (state.runtime.actualStart === null) {
+  if (state.runtime.actualStart === null || state.runtime.plannedEnd === null) {
     return null;
   }
   return state.runtime.plannedEnd - state.runtime.offset + state._timer.totalDelay;
@@ -367,7 +338,7 @@ export function getExpectedEnd(state: RuntimeState): MaybeNumber {
  * @param state
  * @returns
  */
-function isPlaybackActive(state: RuntimeState): boolean {
+export function isPlaybackActive(state: RuntimeState): boolean {
   return (
     state.timer.playback === Playback.Play ||
     state.timer.playback === Playback.Pause ||

apps/server/src/stores/__tests__/runtimeState.test.ts

@@ -36,7 +36,6 @@ const mockState = {
   },
   _timer: {
     pausedAt: null,
-    secondaryTarget: null,
   },
 } as RuntimeState;
 

apps/server/src/stores/runtimeState.ts

@@ -1,9 +1,8 @@
-import { MaybeNumber, OntimeEvent, Playback, Runtime, TimerPhase, TimerState, TimerType } from 'ontime-types';
+import { MaybeNumber, OntimeEvent, Playback, Runtime, TimerPhase, TimerState } from 'ontime-types';
 import { calculateDuration, dayInMs } from 'ontime-utils';
 
 import { clock } from '../services/Clock.js';
 import { RestorePoint } from '../services/RestoreService.js';
-
 import {
   getCurrent,
   getExpectedEnd,
@@ -11,32 +10,32 @@ import {
   getRollTimers,
   getRuntimeOffset,
   getTimerPhase,
-  skippedOutOfEvent,
-  updateRoll,
+  isPlaybackActive,
 } from '../services/timerUtils.js';
 import { timerConfig } from '../config/config.js';
 
 const initialRuntime: Runtime = {
-  selectedEventIndex: null,
-  numEvents: 0,
-  offset: 0,
-  plannedStart: 0,
-  plannedEnd: 0,
-  actualStart: null,
-  expectedEnd: null,
+  selectedEventIndex: null, // changes if rundown changes or we load a new event
+  numEvents: 0, // change initiated by user
+  offset: 0, // changes at runtime
+  plannedStart: 0, // only changes if event changes
+  plannedEnd: 0, // only changes if event changes
+  actualStart: null, // set once we start the timer
+  expectedEnd: null, // changes with runtime, based on offset
 } as const;
 
 const initialTimer: TimerState = {
   addedTime: 0,
-  current: null,
-  duration: null,
-  elapsed: null,
-  expectedFinish: null, // TODO: expected finish could account for midnight, we cleanup in the clients
-  finishedAt: null,
-  phase: TimerPhase.None,
-  playback: Playback.Stop,
-  secondaryTimer: null,
-  startedAt: null,
+  current: null, // changes on every update
+  duration: null, // only changes if event changes
+  elapsed: null, // changes on every update
+  // TODO: expected finish could account for midnight, we cleanup in the clients
+  expectedFinish: null, // change can only be initiated by user
+  finishedAt: null, // can change on update or user action
+  phase: TimerPhase.None, // can change on update or user action
+  playback: Playback.Stop, // change initiated by user
+  secondaryTimer: null, // change on every update
+  startedAt: null, // change can only be initiated by user
 } as const;
 
 export type RuntimeState = {
@@ -49,10 +48,9 @@ export type RuntimeState = {
   timer: TimerState;
   // private properties of the timer calculations
   _timer: {
-    forceFinish: MaybeNumber;
+    forceFinish: MaybeNumber; // wether we should declare an event as finished, will contain the finish time
     totalDelay: number; // this value comes from rundown service
     pausedAt: MaybeNumber;
-    secondaryTarget: MaybeNumber;
   };
 };
 
@@ -68,7 +66,6 @@ const runtimeState: RuntimeState = {
     forceFinish: null,
     totalDelay: 0,
     pausedAt: null,
-    secondaryTarget: null,
   },
 };
 
@@ -93,7 +90,6 @@ export function clear() {
 
   // we maintain the total delay
   runtimeState._timer.pausedAt = null;
-  runtimeState._timer.secondaryTarget = null;
 }
 
 /**
@@ -125,7 +121,8 @@ export function updateRundownData(rundownData: RundownData) {
 
   runtimeState.runtime.numEvents = rundownData.numEvents;
   runtimeState.runtime.plannedStart = rundownData.firstStart;
-  runtimeState.runtime.plannedEnd = rundownData.firstStart + rundownData.totalDuration;
+  runtimeState.runtime.plannedEnd =
+    rundownData.firstStart === null ? null : rundownData.firstStart + rundownData.totalDuration;
   runtimeState.runtime.expectedEnd = getExpectedEnd(runtimeState);
 }
 
@@ -282,7 +279,6 @@ export function start(state: RuntimeState = runtimeState): boolean {
   }
   state.clock = clock.timeNow();
   state.timer.secondaryTimer = null;
-  state._timer.secondaryTarget = null;
 
   // add paused time if it exists
   if (state._timer.pausedAt) {
@@ -374,73 +370,60 @@ export type UpdateResult = {
 };
 
 export function update(): UpdateResult {
-  let hasTimerFinished = false;
-  let shouldCallRoll = false; // we also need to call roll if a secondary timer has finished
+  // 0. there are some things we always do
+  runtimeState.clock = clock.timeNow(); // we update the clock on every update call
 
-  const previousTime = runtimeState.clock;
-  runtimeState.clock = clock.timeNow();
-
-  // we call integrations if we update timers
-  if (runtimeState.timer.playback === Playback.Roll) {
-    const result = onRollUpdate();
-    shouldCallRoll = result.doRoll;
-    hasTimerFinished = result.isFinished;
-  } else if (runtimeState.timer.startedAt !== null) {
-    // we only update timer if a timer has been started
-    const result = onPlayUpdate();
-    hasTimerFinished = result.isFinished;
-  } else if (runtimeState.eventNow?.timerType === TimerType.TimeToEnd) {
-    // or if we are in a time-to-end timer
-    runtimeState.timer.current = getCurrent(runtimeState);
-    runtimeState.timer.duration = runtimeState.timer.current;
+  // 1. is playback idle?
+  if (!isPlaybackActive(runtimeState)) {
+    return updateIfIdle();
   }
 
-  // update timer phase
-  runtimeState.timer.phase = getTimerPhase(runtimeState);
+  // 2. are we waiting to roll?
+  if (runtimeState.timer.playback === Playback.Roll && runtimeState.timer.secondaryTimer !== null) {
+    return updateIfWaitingToRoll(runtimeState.timer.secondaryTimer);
+  }
 
-  // update offset
+  // 3. at this point we know that we are playing an event
+  // reset data
+  runtimeState.timer.secondaryTimer = null;
+
+  // update timer state
+  if (!runtimeState.timer.duration) {
+    throw new Error('Timer duration is not set');
+  }
+
+  runtimeState.timer.current = getCurrent(runtimeState);
+  runtimeState.timer.expectedFinish = getExpectedFinish(runtimeState);
+  runtimeState.timer.phase = getTimerPhase(runtimeState);
+  runtimeState.timer.elapsed = runtimeState.timer.duration - runtimeState.timer.current;
+
+  // update runtime, needs up-to-date timer state
   runtimeState.runtime.offset = getRuntimeOffset(runtimeState);
   runtimeState.runtime.expectedEnd = getExpectedEnd(runtimeState);
 
-  return {
-    hasTimerFinished,
-    shouldCallRoll,
-  };
+  const finishedNow =
+    Boolean(runtimeState._timer.forceFinish) ||
+    (runtimeState.timer.current <= timerConfig.triggerAhead && runtimeState.timer.finishedAt === null);
 
-  function onRollUpdate() {
-    const hasSkippedOutOfEvent = skippedOutOfEvent(runtimeState, previousTime, timerConfig.skipLimit);
-    if (hasSkippedOutOfEvent) {
-      return { doRoll: true };
-    }
-    const { updatedTimer, updatedSecondaryTimer, doRollLoad, isFinished } = updateRoll(runtimeState);
-    runtimeState.timer.current = updatedTimer;
-    runtimeState.timer.secondaryTimer = updatedSecondaryTimer;
-    runtimeState.timer.elapsed = runtimeState.timer.duration - runtimeState.timer.current;
-
-    return { doRoll: doRollLoad, isFinished };
+  if (finishedNow) {
+    // reset state
+    runtimeState._timer.forceFinish;
+    runtimeState.timer.finishedAt = runtimeState._timer.forceFinish ?? runtimeState.clock;
+  } else {
+    runtimeState.timer.expectedFinish = getExpectedFinish(runtimeState);
   }
 
-  function onPlayUpdate() {
-    let isFinished = false;
-    runtimeState.timer.current = getCurrent(runtimeState);
-    const shouldForceFinish = runtimeState._timer.forceFinish !== null;
-    const finishedNow =
-      shouldForceFinish ||
-      (runtimeState.timer.current <= timerConfig.triggerAhead && runtimeState.timer.finishedAt === null);
+  return { hasTimerFinished: finishedNow, shouldCallRoll: finishedNow };
 
-    if (runtimeState.timer.playback === Playback.Play && finishedNow) {
-      runtimeState.timer.finishedAt = runtimeState._timer.forceFinish ?? runtimeState.clock;
-      isFinished = true;
-    } else {
-      runtimeState.timer.expectedFinish = getExpectedFinish(runtimeState);
-    }
+  function updateIfIdle() {
+    // if nothing is running, nothing to do
+    return { hasTimerFinished: false, shouldCallRoll: false };
+  }
 
-    if (shouldForceFinish) {
-      runtimeState._timer.forceFinish = null;
-    }
-    runtimeState.timer.elapsed = runtimeState.timer.duration - runtimeState.timer.current;
-
-    return { isFinished };
+  function updateIfWaitingToRoll(targetTime: number) {
+    runtimeState.timer.secondaryTimer = targetTime - runtimeState.clock;
+    runtimeState.timer.phase = TimerPhase.Pending;
+    return { hasTimerFinished: false, shouldCallRoll: runtimeState.timer.secondaryTimer < 0 };
   }
 }
 
@@ -454,7 +437,6 @@ export function roll(rundown: OntimeEvent[]) {
   if (currentEvent) {
     // there is something running, load
     runtimeState.timer.secondaryTimer = null;
-    runtimeState._timer.secondaryTarget = null;
 
     // account for event that finishes the day after
     const endTime =
@@ -475,8 +457,8 @@ export function roll(rundown: OntimeEvent[]) {
     // account for day after
     const nextStart = nextEvent.timeStart < runtimeState.clock ? nextEvent.timeStart + dayInMs : nextEvent.timeStart;
     // nothing now, but something coming up
+    runtimeState.timer.phase = TimerPhase.Pending;
     runtimeState.timer.secondaryTimer = nextStart - runtimeState.clock;
-    runtimeState._timer.secondaryTarget = nextStart;
   }
 
   runtimeState.timer.playback = Playback.Roll;

packages/types/src/definitions/runtime/TimerState.type.ts

@@ -7,18 +7,27 @@ export enum TimerPhase {
   Warning = 'warning',
   Danger = 'danger',
   Overtime = 'overtime',
-  Pending = 'pending', // used for waiting to roll
+  /** used for waiting to roll */
+  Pending = 'pending',
 }
 
 export type TimerState = {
-  addedTime: number; // time added by user, can be negative
-  current: MaybeNumber; // running countdown
-  duration: MaybeNumber; // normalised duration of current event
-  elapsed: MaybeNumber; // elapsed time in current timer
-  expectedFinish: MaybeNumber; // time we expect timer to finish
-  finishedAt: MaybeNumber; // only if timer has already finished
+  /** time added by user, can be negative */
+  addedTime: number;
+  /** running countdown */
+  current: MaybeNumber;
+  /** normalised duration of current event */
+  duration: MaybeNumber;
+  /** elapsed time in current timer */
+  elapsed: MaybeNumber;
+  /** time we expect timer to finish */
+  expectedFinish: MaybeNumber;
+  /** only if timer has already finished */
+  finishedAt: MaybeNumber;
   phase: TimerPhase;
   playback: Playback;
-  secondaryTimer: MaybeNumber; // used for roll mode
-  startedAt: MaybeNumber; // only if timer has already started
+  /** used for roll mode */
+  secondaryTimer: MaybeNumber;
+  /** only if timer has already started */
+  startedAt: MaybeNumber;
 };