// Locked represents the locked state receiving coins.
func (m *lockMachine) Locked(ctx cells.Cell, event cells.Event) (behaviors.FSMState, error) {
switch event.Topic() {
case "cents?":
return m.Locked, event.Respond(m.cents)
case "info?":
info := fmt.Sprintf("state 'locked' with %d cents", m.cents)
return m.Locked, event.Respond(info)
case "coin!":
cents := payloadCents(event)
if cents < 1 {
return nil, fmt.Errorf("do not insert buttons")
}
m.cents += cents
if m.cents > 100 {
m.cents -= 100
return m.Unlocked, nil
}
return m.Locked, nil
case "button-press!":
if m.cents > 0 {
ctx.Environment().EmitNewContext("restorer", "drop!", m.cents, event.Context())
m.cents = 0
}
return m.Locked, nil
case "screwdriver!":
// Allow a screwdriver to bring the lock into an undefined state.
return nil, nil
}
return m.Locked, fmt.Errorf("illegal topic in state 'locked': %s", event.Topic())
}
// Unlocked represents the unlocked state receiving coins.
func (m *lockMachine) Unlocked(ctx cells.Cell, event cells.Event) (behaviors.FSMState, error) {
switch event.Topic() {
case "cents?":
return m.Unlocked, event.Respond(m.cents)
case "info?":
info := fmt.Sprintf("state 'unlocked' with %d cents", m.cents)
return m.Unlocked, event.Respond(info)
case "coin!":
cents := payloadCents(event)
ctx.EmitNewContext("return", cents, event.Context())
return m.Unlocked, nil
case "button-press!":
ctx.Environment().EmitNewContext("restorer", "drop!", m.cents, event.Context())
m.cents = 0
return m.Locked, nil
}
return m.Unlocked, fmt.Errorf("illegal topic in state 'unlocked': %s", event.Topic())
}