Generated by XState Viz: https://xstate.js.org/viz

machine.js

const fetchMachine = Machine({
  id: 'telemetry',
  initial: 'A_OFF',
  context: {
    timestampStart: null,
    currentADuration: 0,
    currentCounter: 0,
  },
  states: {
    A_OFF: {
      on: {
        'A-ON': {
          target: 'A_ON',
          actions: ['setTimestampStart']
        }
      }
    },
    A_ON: {
      on: {
        'A-OFF': {
          target: 'A_OFF',
          actions: ['calculateDuration', 'resetIfNecessary']
        },
        B: {
          actions: ['incrementCounter']
        }
      }
    }
  }
},
{
  actions: {
    setTimestampStart: XState.assign({
      timestampStart: (context, event) => event.timestamp
    }),
    calculateDuration: XState.assign({
      currentADuration: (context, event) => context.currentADuration + (event.timestamp - context.timestampStart)
    }),
    incrementCounter: XState.assign({
      currentCounter: (context) => context.currentCounter + 1
    }),
    resetIfNecessary: XState.assign({
      currentADuration: (context) => context.currentADuration >= 3600 ? 0 : context.currentADuration,
      currentCounter: (context) => context.currentADuration >= 3600 ? 0 : context.currentCounter
    })
  }
});