rgoue/game/sticks.go

//nolint:mnd // C-faithful literals; names hurt C-greppability (approved 2026-07-07)
package game

import "fmt"

// sticks.c — zap wands and staffs.

// The two ws_type strings a stick can be made as.
const (
	wandName  = "wand"
	staffName = "staff"
)

// doZap performs a zap with a wand (sticks.c do_zap).
func (g *RogueGame) doZap() {
	obj, ok := g.promptPackItem("zap with", KindWand)
	if !ok {
		return
	}

	if obj.Kind != KindWand {
		g.After = false
		g.msg("you can't zap with that!")

		return
	}

	if obj.Charges == 0 {
		g.msg("nothing happens")

		return
	}

	// A malformed Which yields no handler, which is exactly what C did in a
	// non-MASTER build: its do_zap switch matched no case, fell out, and
	// still ran o_charges--. (The MASTER-only "what a bizarre schtick!"
	// message for that arm is issue #13, not this bounds fix.)
	if h := g.data.zapHandler(obj); h != nil {
		if !h(g, obj) {
			return // the zap aborted; no charge is used
		}
	}

	obj.Charges--
}

// zapRayMonster walks the zap ray from the hero to the first blocking
// spot and returns the monster standing there, if any (the shared
// preamble of the C monster-affecting zap cases).
func (g *RogueGame) zapRayMonster() *Monster {
	p := &g.Player

	y := p.Pos.Y

	x := p.Pos.X
	for stepOk(g.Level.VisibleChar(y, x)) {
		y += g.Delta.Y
		x += g.Delta.X
	}

	return g.Level.MonsterAt(y, x)
}

// zapVictim is zapRayMonster plus the flytrap release the C code does
// before the invisibility-family effects.
func (g *RogueGame) zapVictim() *Monster {
	tp := g.zapRayMonster()
	if tp != nil && tp.Type == 'F' {
		g.Player.Flags.Clear(Held)
	}

	return tp
}

// The per-wand effect handlers, dispatched through gameData.zapHandlers.
// Each is one case of the C do_zap switch; returning false aborts the
// zap without using a charge.

func (g *RogueGame) zapLight(*Object) bool {
	// Reddy Kilowatt wand.  Light up the room
	p := &g.Player

	g.Items.Sticks[WandLight].Know = true
	if p.Room.Flags.Has(Gone) {
		g.msg("the corridor glows and then fades")
	} else {
		p.Room.Flags.Clear(Dark)
		// Light the room and put the player back up
		g.enterRoom(p.Pos)
		g.addmsgf("the room is lit")

		if !g.Options.Terse {
			g.addmsgf(" by a shimmering %s light", g.pickColor("blue"))
		}

		g.endmsg()
	}

	return true
}

func (g *RogueGame) zapDrainLife(*Object) bool {
	// take away 1/2 of hero's hit points, then take it away evenly
	// from the monsters in the room (or next to hero if he is in a
	// passage)
	if g.Player.Stats.HP < 2 {
		g.msg("you are too weak to use it")

		return false
	}

	g.drain()

	return true
}

func (g *RogueGame) zapInvisibility(*Object) bool {
	if tp := g.zapVictim(); tp != nil {
		tp.Flags.Set(Invisible)

		if g.canSee(tp.Pos.Y, tp.Pos.X) {
			g.mvaddch(tp.Pos.Y, tp.Pos.X, tp.OldCh)
		}
	}

	return true
}

func (g *RogueGame) zapPolymorph(*Object) bool {
	tp := g.zapVictim()
	if tp == nil {
		return true
	}

	y, x := tp.Pos.Y, tp.Pos.X

	pp := tp.Pack
	g.Level.RemoveMonster(tp)

	if g.seeMonst(tp) {
		g.mvaddch(y, x, g.Level.Char(y, x))
	}

	oldch := tp.OldCh
	g.Delta.Y = y
	g.Delta.X = x
	monster := g.randomMonsterLetter()
	g.newMonster(tp, monster, g.Delta)

	if g.seeMonst(tp) {
		g.mvaddch(y, x, monster)
	}

	tp.OldCh = oldch

	tp.Pack = pp
	if g.seeMonst(tp) {
		g.Items.Sticks[WandPolymorph].Know = true
	}

	return true
}

func (g *RogueGame) zapCancellation(*Object) bool {
	if tp := g.zapVictim(); tp != nil {
		tp.Flags.Set(Cancelled)
		tp.Flags.Clear(Invisible | CanConfuse)

		tp.Disguise = tp.Type
		if g.seeMonst(tp) {
			g.mvaddch(tp.Pos.Y, tp.Pos.X, tp.Disguise)
		}
	}

	return true
}

func (g *RogueGame) zapTeleport(obj *Object) bool {
	p := &g.Player

	tp := g.zapVictim()
	if tp == nil {
		return true
	}

	var newPos Coord

	if obj.WandKind() == WandTeleportAway {
		for {
			newPos, _ = g.findFloor(true)
			if newPos != p.Pos {
				break
			}
		}
	} else {
		newPos.Y = p.Pos.Y + g.Delta.Y
		newPos.X = p.Pos.X + g.Delta.X
	}

	tp.Dest = &p.Pos
	tp.Flags.Set(Awake)
	g.relocate(tp, newPos)

	return true
}

func (g *RogueGame) zapMagicMissile(*Object) bool {
	p := &g.Player

	g.Items.Sticks[WandMagicMissile].Know = true
	bolt := newObject()
	bolt.Kind = KindGold // C set o_type='*': draws a '*' and is not a weapon
	bolt.HurlDmg = dice("1x4")
	bolt.HPlus = 100
	bolt.DPlus = 1

	bolt.Flags = Missile
	if p.CurWeapon != nil {
		bolt.Launch = WeaponKind(p.CurWeapon.Which)
	}

	g.doMotion(bolt, g.Delta.Y, g.Delta.X)

	if tp := g.Level.MonsterAt(bolt.Pos.Y, bolt.Pos.X); tp != nil &&
		!g.saveThrow(VsMagic, &tp.Stats) {
		g.hitMonster(bolt.Pos, bolt)
	} else if g.Options.Terse {
		g.msg("missle vanishes") //nolint:misspell // C's spelling, kept faithfully
	} else {
		g.msg("the missle vanishes with a puff of smoke") //nolint:misspell // C's spelling
	}

	return true
}

func (g *RogueGame) zapSpeed(obj *Object) bool {
	tp := g.zapRayMonster()
	if tp == nil {
		return true
	}

	if obj.WandKind() == WandHasteMonster {
		hasteTarget(tp)
	} else {
		slowTarget(tp)
	}

	g.Delta.Y = tp.Pos.Y
	g.Delta.X = tp.Pos.X
	g.runTo(g.Delta)

	return true
}

// hasteTarget cancels a slow or applies a haste (the WS_HASTE_M arm of
// do_zap).
func hasteTarget(tp *Monster) {
	if tp.On(Slowed) {
		tp.Flags.Clear(Slowed)
	} else {
		tp.Flags.Set(Hasted)
	}
}

// slowTarget cancels a haste or applies a slow (the WS_SLOW_M arm of
// do_zap).
func slowTarget(tp *Monster) {
	if tp.On(Hasted) {
		tp.Flags.Clear(Hasted)
	} else {
		tp.Flags.Set(Slowed)
	}

	tp.Turn = true
}

func (g *RogueGame) zapBolt(obj *Object) bool {
	var name string

	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
	switch obj.WandKind() {
	case WandLightning:
		name = "bolt"
	case WandFire:
		name = "flame"
	default:
		name = "ice"
	}

	g.fireBolt(g.Player.Pos, &g.Delta, name)
	g.Items.Sticks[obj.Which].Know = true

	return true
}

// drain does the drain-hit-points-from-player schtick (sticks.c drain).
func (g *RogueGame) drain() {
	p := &g.Player
	// First count how many things we need to spread the hit points among
	var corp *Room
	if g.Level.Char(p.Pos.Y, p.Pos.X) == Door {
		corp = &g.Level.Passages[*g.Level.FlagsAt(p.Pos.Y, p.Pos.X)&FPassNum]
	}

	inpass := p.Room.Flags.Has(Gone)

	var drainee []*Monster

	for _, mp := range g.Level.Monsters {
		if g.drainReaches(mp, corp, inpass) {
			drainee = append(drainee, mp)
		}
	}

	cnt := len(drainee)
	if cnt == 0 {
		g.msg("you have a tingling feeling")

		return
	}

	p.Stats.HP /= 2
	cnt = p.Stats.HP / cnt
	// Now zot all of the monsters
	for _, mp := range drainee {
		if mp.Stats.HP -= cnt; mp.Stats.HP <= 0 {
			g.killed(mp, g.seeMonst(mp))
		} else {
			g.runTo(mp.Pos)
		}
	}
}

// drainReaches reports whether the drain-life wand reaches this monster:
// the hero's room, the passage behind the door he stands on, or — when
// he is in a passage — a door of that same passage (the drainee
// condition of sticks.c drain).
func (g *RogueGame) drainReaches(mp *Monster, corp *Room, inpass bool) bool {
	p := &g.Player

	return mp.Room == p.Room || mp.Room == corp ||
		(inpass && g.Level.Char(mp.Pos.Y, mp.Pos.X) == Door &&
			&g.Level.Passages[*g.Level.FlagsAt(mp.Pos.Y, mp.Pos.X)&FPassNum] == p.Room)
}

// fireBolt fires a bolt in a given direction from a specific starting
// place (sticks.c fire_bolt).
func (g *RogueGame) fireBolt(start Coord, dir *Coord, name string) {
	p := &g.Player
	fromHero := start == p.Pos

	bolt := newObject()
	bolt.Kind = KindWeapon
	bolt.Which = int(WeaponFlame)
	bolt.HurlDmg = dice("6x6")
	bolt.HPlus = 100
	bolt.DPlus = 0
	g.Items.Weapons[WeaponFlame].Name = name

	dirch := boltDirChar(*dir)
	pos := start
	hitHero := !fromHero
	used := false
	changed := false

	var spotpos []Coord
	for len(spotpos) < BoltLength && !used {
		pos.Y += dir.Y
		pos.X += dir.X
		spotpos = append(spotpos, pos)

		ch := g.Level.VisibleChar(pos.Y, pos.X)
		if boltBounces(ch, p.Pos, pos) {
			if !changed {
				hitHero = !hitHero
			}

			changed = false
			dir.Y = -dir.Y
			dir.X = -dir.X
			spotpos = spotpos[:len(spotpos)-1]

			g.msg("the %s bounces", name)

			continue
		}

		if tp := g.Level.MonsterAt(pos.Y, pos.X); !hitHero && tp != nil {
			hitHero = true
			changed = !changed
			used = g.boltStrikesMonster(tp, bolt, pos, ch, name, fromHero)
		} else if hitHero && pos == p.Pos {
			hitHero = false
			changed = !changed
			used = g.boltStrikesHero(start, name, fromHero)
		}

		g.mvaddch(pos.Y, pos.X, dirch)
		g.refresh()
	}
	// erase the bolt trail
	for _, c2 := range spotpos {
		g.mvaddch(c2.Y, c2.X, g.Level.Char(c2.Y, c2.X))
	}
}

// boltDirChar picks the character a traveling bolt is drawn with for its
// direction (the dirch switch of sticks.c fire_bolt).
func boltDirChar(dir Coord) byte {
	switch dir.Y + dir.X {
	case 0:
		return '/'
	case 1, -1:
		if dir.Y == 0 {
			return '-'
		}

		return '|'
	case 2, -2:
		return '\\'
	}

	return 0 // unreachable for the eight legal directions, as in C
}

// boltBounces reports whether a bolt bounces off this spot: walls, and
// any door except the one the hero stands on (which would otherwise loop
// infinitely, per the C comment in fire_bolt).
func boltBounces(ch byte, heroPos, pos Coord) bool {
	switch ch {
	case Door:
		return heroPos != pos
	case '|', '-', ' ':
		return true
	}

	return false
}

// boltStrikesMonster resolves a bolt arriving on a monster's square (the
// monster arm of the fire_bolt loop). It reports whether the bolt was
// used up.
func (g *RogueGame) boltStrikesMonster(
	tp *Monster, bolt *Object, pos Coord, ch byte, name string, fromHero bool,
) bool {
	tp.OldCh = g.Level.Char(pos.Y, pos.X)
	if !g.saveThrow(VsMagic, &tp.Stats) {
		bolt.Pos = pos

		if tp.Type == 'D' && name == "flame" {
			g.addmsgf("the flame bounces")

			if !g.Options.Terse {
				g.addmsgf(" off the dragon")
			}

			g.endmsg()
		} else {
			g.hitMonster(pos, bolt)
		}

		return true
	}

	if ch != 'M' || tp.Disguise == 'M' {
		if fromHero {
			g.runTo(pos)
		}

		if g.Options.Terse {
			g.msg("%s misses", name)
		} else {
			g.msg("the %s whizzes past %s", name, g.setMname(tp))
		}
	}

	return false
}

// boltStrikesHero resolves a bolt arriving on the hero (the hero arm of
// the fire_bolt loop). It reports whether the bolt was used up.
func (g *RogueGame) boltStrikesHero(start Coord, name string, fromHero bool) bool {
	p := &g.Player
	if g.save(VsMagic) {
		g.msg("the %s whizzes by you", name)

		return false
	}

	if p.Stats.HP -= g.roll(6, 6); p.Stats.HP <= 0 {
		if fromHero {
			g.death('b')
		} else {
			g.death(g.Level.MonsterAt(start.Y, start.X).Type)
		}
	}

	if g.Options.Terse {
		g.msg("the %s hits", name)
	} else {
		g.msg("you are hit by the %s", name)
	}

	return true
}

// fixStick sets up a new wand or staff (sticks.c fix_stick).
func (g *RogueGame) fixStick(cur *Object) {
	// ws_type[] is indexed by Which; a malformed one is treated as a wand,
	// which is the branch the C string compare would take against any
	// value that is not literally "staff". The charge switch below already
	// funnels everything but WandLight into its default arm.
	if cur.hasValidWhich() && g.Items.WandType[cur.Which] == staffName {
		cur.Damage = dice("2x3")
	} else {
		cur.Damage = dice("1x1")
	}

	cur.HurlDmg = dice("1x1")

	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
	switch cur.WandKind() {
	case WandLight:
		cur.Charges = g.rnd(10) + 10
	default:
		cur.Charges = g.rnd(5) + 3
	}
}

// chargeStr returns the charge-count suffix for an identified stick
// (sticks.c charge_str).
func chargeStr(g *RogueGame, obj *Object) string {
	if !obj.Flags.Has(Known) {
		return ""
	}

	if g.Options.Terse {
		return fmt.Sprintf(" [%d]", obj.Charges)
	}

	return fmt.Sprintf(" [%d charges]", obj.Charges)
}