// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
 
package machine

type Modeler interface {
  Trigger(transition Transitioner) error
  ChangeState(target State) State
  InspectState() State
}

type Model struct {
  state State
}

func NewModel(initial State) Modeler {
  return &Model{ state: initial }
}

func (m *Model) Trigger(transition Transitioner) error {
  return transition.Run(m)
}

func (m *Model) ChangeState(target State) State {
  oldState :=  m.state
  m.state = target
  return oldState
}

func (m *Model) InspectState() State {
  return m.state
}