package game

import "math/rand/v2"

type item int8

const (
	itemNone item = iota
	itemLens
	itemCig
	itemBeer
	itemCuff
	itemKnife
	itemAdrenaline
	itemPhone
	itemInverter
	itemPill
)

func newItem() item {
	return item(rand.IntN(9)) + 1
}

func (i item) apply(g *Match) bool {
	switch i {
	case itemNone:
		return false
	case itemLens:
		// Lenses are always used, even if they have no effect.
		g.action = actLens
		g.reveal = true
		return true
	case itemCig:
		cur := g.CurrentPlayer()
		if cur.hp < g.hp {
			cur.hp++
			// Cigs are always used, even if they have no effect.
		}
		g.action = actCig
		return true
	case itemBeer:
		g.popShell()
		g.action = actBeer
		if g.Empty() {
			g.action = actBeerGameEnd
			g.NextGame()
		}
		return true
	case itemCuff:
		opp := g.Opponent()
		if opp.cuffs != uncuffed {
			return false
		}
		g.action = actCuff
		opp.cuffs = cuffedSkip
		return true
	case itemKnife:
		if g.damage != 1 {
			return false
		}
		g.action = actKnife
		g.damage = 2
		return true
	case itemAdrenaline:
		if g.adrenaline {
			// Adrenaline forbids using adrenaline.
			return false
		}
		g.action = actAdrenaline
		g.adrenaline = true
		return true
	case itemPhone:
		g.action = actPhone
		// TODO(zeph): implement
		return true
	case itemInverter:
		g.action = actInverter
		g.shells[0] = !g.shells[0]
		return true
	case itemPill:
		cur := g.CurrentPlayer()
		if rand.Uint64() <= (1<<65)/5 {
			g.action = actPillsHeal
			cur.hp = min(cur.hp+2, g.hp)
		} else {
			g.action = actPillsHurt
			cur.hp--
		}
		return true
	default:
		panic("shotgun: unknown item")
	}
}

var itemNames = [...]string{
	itemNone:       "",
	itemLens:       "🔍",
	itemCig:        "🚬",
	itemBeer:       "🍺",
	itemCuff:       "👮",
	itemKnife:      "🔪",
	itemAdrenaline: "💉",
	itemPhone:      "📱",
	itemInverter:   "🧲",
	itemPill:       "💊",
}

func (i item) String() string {
	return itemNames[i]
}