package westworldwithwoman

import (
	"fmt"
	"sync"
)

// quenchThirst is the Go version of the (not yet pasted) singleton
// class QuenchThirst from the book. Same pattern as
// enterMineAndDigForNugget: unexported type, one shared instance,
// reached only through the function below.
type quenchThirst struct{}

var (
	quenchThirstInstance *quenchThirst
	quenchThirstOnce     sync.Once
)

// QuenchThirst is the Go stand-in for "QuenchThirst::Instance()".
func QuenchThirst() *quenchThirst {
	quenchThirstOnce.Do(func() {
		quenchThirstInstance = &quenchThirst{}
	})
	return quenchThirstInstance
}

var _ State[Miner] = (*quenchThirst)(nil)

// The book hasn't shown us this state's real code, so this is our
// own implementation based purely on its written description: "he
// visits the saloon in order to buy a whiskey. When his thirst is
// quenched, he changes state to EnterMineAndDigForNugget."

// Enter sends the miner to the saloon, if he isn't there already.
func (s *quenchThirst) Enter(m *Miner) {
	if m.Location() != saloon {
		fmt.Printf("\n%s: Headin' to the saloon for a whiskey", GetNameOfEntity(m.ID()))
		m.ChangeLocation(saloon)
	}
}

// Execute buys and drinks one whiskey, which is all it takes to
// quench the thirst, then goes straight back to digging.
func (s *quenchThirst) Execute(m *Miner) {
	fmt.Printf("\n%s: That's mighty fine sippin' liquor", GetNameOfEntity(m.ID()))
	m.BuyAndDrinkAWhiskey()
	m.ChangeState(EnterMineAndDigForNugget())
}

// Exit announces that the miner is leaving the saloon.
func (s *quenchThirst) Exit(m *Miner) {
	fmt.Printf("\n%s: Leavin' the saloon, feelin' good", GetNameOfEntity(m.ID()))
}