pod "NBStateMachine"

//states
let stateLyingDown = State(name: "Lying Down")
let stateStanding = State(name: "Standing")
let stateSitting = State(name: "Sitting Down")
let stateRunning = State(name: "Running")

//events
let eventSitDown = Event(eventName: "Sit Down", sourceStates: [stateStanding, stateLyingDown], destinationState: stateSitting)
eventSitDown.willFireEvent = { (event:Event) -> Bool in
print("I'm about to sit down")
return true
}
eventSitDown.didFireEvent = { (event:Event) -> Void in
print("I'm am siting down")
}



let eventStandUp = Event(eventName: "Stand Up", sourceStates: [stateSitting, stateRunning], destinationState: stateStanding)
eventStandUp.willFireEvent = { (event:Event) -> Bool in
print("I'm about to Stand")
return true
}
eventStandUp.didFireEvent = { (event:Event) -> Void in
print("I'm am Standing")
}


let eventStartRunning = Event(eventName: "Start Running", sourceStates: [stateStanding, stateRunning], destinationState: stateRunning)
eventStartRunning.willFireEvent = { (event:Event) -> Bool in
print("I'm about to Start running")
return true
}
eventStartRunning.didFireEvent = { (event:Event) -> Void in
print("I'm am Running")
}

//initiate NBStateMachine
let machine = NBStateMachine(initialState: stateLyingDown)
machine.addStates([stateSitting, stateRunning, stateStanding])
machine.addEvents([eventSitDown, eventStandUp, eventStartRunning])

//fire an event
let transition = machine.fireEvent(eventSitDown) //try also eventStandUp, eventStartRunning

print("transition from State:\(transition.sourceState.name)  to State:\(transition.destinationState.name) was successful :\(transition.successful) with error:\(transition.error?.description)")