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

machine.js

async function authorizeCharge() {
  return true
}

const canAddCharge = (context) => {
  return context.batteryLevel < context.batteryCapacity
}

const cantAddCharge = (context) => {
  return context.batteryLevel === context.batteryCapacity
}

const resetBattery = assign({
  batteryCapacity: 0,
  batteryLevel: 0
})

const setBattery = assign({
  batteryCapacity: (context, event) => event.batteryCapacity,
  batteryLevel: (context, event) => event.batteryLevel
})

const addCharge = assign({
  batteryLevel: (context) => context.batteryLevel + 1
})

const chargePointStateMachine = Machine({
  id: 'status',
  initial: 'Available',
  context: {
    batteryCapacity: 0,
    batteryLevel: 0
  },
  states: {
    Available: {
      entry: resetBattery,
      on: {
        PLUGIN: {
          target: 'Preparing',
          actions: setBattery
        },
      }
    },
    Preparing: {
      on: {
        UNPLUG: 'Available',
        START_CHARGE: 'Charging',
        ERROR: 'Faulted'
      },
      invoke: {
        id: 'Authorize',
        src: authorizeCharge,
        onDone: 'Charging'
      }
    },
    Charging: {
      after: {
        60000: [{
          target: 'Charging',
          actions: addCharge,
          cond: 'canAddCharge'
        }, {
          target: 'Finishing',
          cond: 'cantAddCharge'
        }]
      },
      on: {
        UNPLUG: 'Available',
        ERROR: 'Faulted'
      }
    },
    Finishing: {
      on: {
        UNPLUG: 'Available',
        ERROR: 'Faulted'
      },
    },
    Faulted: {
      on: {
        UNPLUG: 'Available'
      }
    }
  }
}, {
  guards: {
    canAddCharge,
    cantAddCharge
  }
})