9 changed files with 103 additions and 171 deletions
--- a/game/action.go
+++ b/game/action.go
@ -17,11 +17,6 @@ const (
 	actBeer // note prev indicates whether the shell was live
 	actCuff
 	actKnife
-	actAdrenaline
-	actPhone
-	actInverter
-	actPillsHeal
-	actPillsHurt

 	actDealerConcedes     // dealer concedes
 	actChallengerConcedes // challenger concedes
--- a/game/action_string.go
+++ b/game/action_string.go
@ -19,18 +19,13 @@ func _() {
 	_ = x[actBeer-8]
 	_ = x[actCuff-9]
 	_ = x[actKnife-10]
-	_ = x[actAdrenaline-11]
-	_ = x[actPhone-12]
-	_ = x[actInverter-13]
-	_ = x[actPillsHeal-14]
-	_ = x[actPillsHurt-15]
-	_ = x[actDealerConcedes-16]
-	_ = x[actChallengerConcedes-17]
+	_ = x[actDealerConcedes-11]
+	_ = x[actChallengerConcedes-12]
 }

-const _action_name = "StartShootGameEndBeerGameEndChallengerWinsDealerWinsLensCigBeerCuffKnifeAdrenalinePhoneInverterPillsHealPillsHurtDealerConcedesChallengerConcedes"
+const _action_name = "StartShootGameEndBeerGameEndChallengerWinsDealerWinsLensCigBeerCuffKnifeDealerConcedesChallengerConcedes"

-var _action_index = [...]uint8{0, 5, 10, 17, 28, 42, 52, 56, 59, 63, 67, 72, 82, 87, 95, 104, 113, 127, 145}
+var _action_index = [...]uint8{0, 5, 10, 17, 28, 42, 52, 56, 59, 63, 67, 72, 86, 104}

 func (i action) String() string {
 	if i >= action(len(_action_index)-1) {
--- a/game/game.go
+++ b/game/game.go
@ -5,13 +5,12 @@
 //     It ends when the challenger wins three rounds or the dealer wins once.
 //   - A round is an instance of gameplay. Both players start each round with
 //     the same HP, and it continues until either player reaches zero.
-//   - A game is a set of 2-8 shells and 2-5 items delivered to each player.
+//   - A game is a set of 2-8 shells and 1-4 items delivered to each player.
 //     The challenger always moves first at the start of each game.
 package game

 import (
 	"errors"
-	"math/rand/v2"
 	"time"

 	"git.sunturtle.xyz/studio/shotgun/player"
@ -19,6 +18,8 @@ import (
 )

 type Match struct {
+	// rng is the PRNG state used for this match.
+	rng xoshiro
 	// players are the players in the match. The first element is the dealer
 	// and the second is the challenger.
 	players [2]playerState
@ -36,9 +37,6 @@ type Match struct {
 	// reveal indicates whether the current player has revealed the shell that
 	// will fire next.
 	reveal bool
-	// adrenaline indicates whether the current player has adrenaline in
-	// effect, requiring them to use an opponent's item.
-	adrenaline bool
 	// prev is a pointer to the element of shellArray which was fired last this
 	// game, or nil if none has been.
 	prev *bool
@ -52,6 +50,7 @@ type Match struct {
 // New creates a new match started at round 1.
 func New(dealer, challenger player.ID) *Match {
 	g := &Match{
+		rng: newRNG(),
 		players: [2]playerState{
 			{id: dealer},
 			{id: challenger},
@ -63,7 +62,7 @@ func New(dealer, challenger player.ID) *Match {

 // NextRound starts the next round of a match.
 func (g *Match) NextRound() {
-	g.hp = int8(rand.IntN(3) + 2)
+	g.hp = int8(g.rng.Intn(3) + 2)
 	g.players[0].startRound(g.hp)
 	g.players[1].startRound(g.hp)
 	g.round++
@ -72,10 +71,10 @@ func (g *Match) NextRound() {

 // NextGame starts the next game of a round.
 func (g *Match) NextGame() {
-	items := rand.IntN(4) + 2
-	g.players[0].startGame(items)
-	g.players[1].startGame(items)
-	shells := rand.IntN(6) + 2
+	items := g.rng.Intn(4) + 1
+	g.players[0].startGame(&g.rng, items)
+	g.players[1].startGame(&g.rng, items)
+	shells := g.rng.Intn(6) + 2
 	for i := 0; i < shells/2; i++ {
 		g.shellArray[i] = true
 	}
@ -83,7 +82,7 @@ func (g *Match) NextGame() {
 		g.shellArray[i] = false
 	}
 	g.shells = g.shellArray[:shells]
-	shuffle(g.shells)
+	shuffle(&g.rng, g.shells)
 	g.turn = 0
 	g.prev = nil
 	g.nextTurn()
@ -120,22 +119,17 @@ func (g *Match) Opponent() *playerState {
 // Apply uses an item by index for the current player.
 // If this causes the current game to end (a beer discharges the last shell),
 // returns ErrGameEnded but does not start the next game.
-// Returns ErrWrongTurn if id does not correspond to the current player
-// (with appropriate exception for adrenaline).
+// Returns ErrWrongTurn if id does not correspond to the current player.
 func (g *Match) Apply(id player.ID, item int) error {
-	p := g.CurrentPlayer()
-	if g.adrenaline {
-		p = g.Opponent()
-	}
-	if p.id != id {
+	cur := g.CurrentPlayer()
+	if cur.id != id {
 		return ErrWrongTurn
 	}
-	if item < 0 || item >= len(p.items) {
+	if item < 0 || item >= len(cur.items) {
 		return errors.New("item index out of bounds")
 	}
-	if p.items[item].apply(g) {
-		p.items[item] = itemNone
-		g.adrenaline = false
+	if cur.items[item].apply(g) {
+		cur.items[item] = itemNone
 	}
 	if g.Empty() {
 		return ErrGameEnded
@ -191,11 +185,10 @@ func (g *Match) MatchWinner() *playerState {
 // player if self is true. Advances the turn if appropriate.
 // Returns ErrRoundEnded if this causes the round to end.
 // Returns ErrGameEnded if this causes the game but not the round to end.
-// Returns ErrWrongTurn if id does not correspond to the current player
-// or if adrenaline is in effect.
+// Returns ErrWrongTurn if id does not correspond to the current player.
 func (g *Match) Shoot(id player.ID, self bool) error {
 	cur := g.CurrentPlayer()
-	if cur.id != id || g.adrenaline {
+	if cur.id != id {
 		return ErrWrongTurn
 	}
 	target := g.Opponent()
--- a/game/item.go
+++ b/game/item.go
@ -1,7 +1,5 @@
 package game

-import "math/rand/v2"
-
 type item int8

 const (
@ -11,14 +9,10 @@ const (
 	itemBeer
 	itemCuff
 	itemKnife
-	itemAdrenaline
-	itemPhone
-	itemInverter
-	itemPill
 )

-func newItem() item {
-	return item(rand.IntN(9)) + 1
+func newItem(rng *xoshiro) item {
+	return item(rng.Intn(5)) + 1
 }

 func (i item) apply(g *Match) bool {
@ -61,49 +55,12 @@ func (i item) apply(g *Match) bool {
 		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:       "💊",
-}
+var itemNames = [...]string{"", "🔍", "🚬", "🍺", "👮", "🔪"}

 func (i item) String() string {
 	return itemNames[i]
--- a/game/item_test.go
+++ b/game/item_test.go
@ -13,10 +13,6 @@ func TestItemStrings(t *testing.T) {
 		{itemBeer, "🍺"},
 		{itemCuff, "👮"},
 		{itemKnife, "🔪"},
-		{itemAdrenaline, "💉"},
-		{itemPhone, "📱"},
-		{itemInverter, "🧲"},
-		{itemPill, "💊"},
 	}
 	for _, c := range cases {
 		got := c.item.String()
--- a/game/player.go
+++ b/game/player.go
@ -19,13 +19,13 @@ func (p *playerState) startRound(hp int8) {
 	clear(p.items[:])
 }

-func (p *playerState) startGame(items int) {
+func (p *playerState) startGame(rng *xoshiro, items int) {
 	for i := 0; i < items; i++ {
 		k := slices.Index(p.items[:], itemNone)
 		if k < 0 {
 			break
 		}
-		p.items[k] = newItem()
+		p.items[k] = newItem(rng)
 	}
 	p.cuffs = uncuffed
 }
--- a/game/rng.go
+++ b/game/rng.go
@ -1,10 +1,65 @@
 package game

-import "math/rand/v2"
+import (
+	"crypto/rand"
+	"encoding/binary"
+	"math/bits"
+)

-func shuffle[E any, S ~[]E](s S) {
+// xoshiro is a random number generator for shotgun.
+//
+// Currently xoshiro256**. Subject to change.
+type xoshiro struct {
+	w, x, y, z uint64
+}
+
+// newRNG produces a new, uniquely seeded RNG.
+func newRNG() xoshiro {
+	r := xoshiro{}
+	b := make([]byte, 8*4)
+	// Loop to ensure the state is never all-zero, which is an invalid state
+	// for xoshiro.
+	for r.w == 0 && r.x == 0 && r.y == 0 && r.z == 0 {
+		rand.Read(b)
+		r.w = binary.LittleEndian.Uint64(b)
+		r.x = binary.LittleEndian.Uint64(b[8:])
+		r.y = binary.LittleEndian.Uint64(b[16:])
+		r.z = binary.LittleEndian.Uint64(b[24:])
+	}
+	return r
+}
+
+// Uint64 produces a 64-bit pseudo-random value.
+func (rng *xoshiro) Uint64() uint64 {
+	w, x, y, z := rng.w, rng.x, rng.y, rng.z
+	r := bits.RotateLeft64(x*5, 7) * 9
+	t := x << 17
+	y ^= w
+	z ^= x
+	x ^= y
+	w ^= z
+	y ^= t
+	z = bits.RotateLeft64(z, 45)
+	rng.w, rng.x, rng.y, rng.z = w, x, y, z
+	return r
+}
+
+// Intn produces an int in [0, n). Panics if n <= 0.
+func (rng *xoshiro) Intn(n int) int {
+	if n <= 0 {
+		panic("shotgun: rng.Intn max below zero")
+	}
+	bad := ^uint(0) - ^uint(0)%uint(n)
+	x := uint(rng.Uint64())
+	for x > bad {
+		x = uint(rng.Uint64())
+	}
+	return int(x % uint(n))
+}
+
+func shuffle[E any, S ~[]E](rng *xoshiro, s S) {
 	for i := len(s) - 1; i > 0; i-- {
-		j := rand.IntN(i + 1)
+		j := rng.Intn(i + 1)
 		s[i], s[j] = s[j], s[i]
 	}
 }
--- a/go.mod
+++ b/go.mod
@ -1,40 +1,32 @@
 module git.sunturtle.xyz/studio/shotgun

-go 1.22.2
+go 1.21.6

 require (
-	github.com/go-chi/chi/v5 v5.0.12
-	github.com/google/uuid v1.6.0
+	github.com/go-chi/chi/v5 v5.0.11
+	github.com/google/uuid v1.5.0
 	gitlab.com/zephyrtronium/sq v1.0.1
-	golang.org/x/crypto v0.22.0
-	modernc.org/sqlite v1.29.5
-	nhooyr.io/websocket v1.8.11
+	golang.org/x/crypto v0.18.0
+	modernc.org/sqlite v1.28.0
+	nhooyr.io/websocket v1.8.10
 )

 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.19.0 // indirect
-	golang.org/x/tools v0.20.0 // indirect
-	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
-	lukechampine.com/uint128 v1.3.0 // indirect
-	modernc.org/cc/v3 v3.41.0 // indirect
-	modernc.org/cc/v4 v4.20.0 // indirect
-	modernc.org/ccgo/v3 v3.17.0 // indirect
-	modernc.org/ccgo/v4 v4.16.0 // indirect
-	modernc.org/gc/v2 v2.4.1 // indirect
-	modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 // indirect
-	modernc.org/libc v1.49.2 // indirect
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	lukechampine.com/uint128 v1.2.0 // indirect
+	modernc.org/cc/v3 v3.40.0 // indirect
+	modernc.org/ccgo/v3 v3.16.13 // indirect
+	modernc.org/libc v1.29.0 // indirect
 	modernc.org/mathutil v1.6.0 // indirect
-	modernc.org/memory v1.8.0 // indirect
+	modernc.org/memory v1.7.2 // indirect
 	modernc.org/opt v0.1.3 // indirect
-	modernc.org/sortutil v1.2.0 // indirect
-	modernc.org/strutil v1.2.0 // indirect
-	modernc.org/token v1.1.0 // indirect
+	modernc.org/strutil v1.1.3 // indirect
+	modernc.org/token v1.0.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -2,28 +2,18 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-chi/chi/v5 v5.0.11 h1:BnpYbFZ3T3S1WMpD79r7R5ThWX40TaFB7L31Y8xqSwA=
 github.com/go-chi/chi/v5 v5.0.11/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
-github.com/go-chi/chi/v5 v5.0.12 h1:9euLV5sTrTNTRUU9POmDUvfxyj6LAABLUcEWO+JJb4s=
-github.com/go-chi/chi/v5 v5.0.12/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26/go.mod h1:dDKJzRmX4S37WGHujM7tX//fmj1uioxKzKxz3lo4HJo=
 github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU=
 github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
-github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
-github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
 github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-sqlite3 v1.14.16 h1:yOQRA0RpS5PFz/oikGwBEqvAWhWg5ufRz4ETLjwpU1Y=
 github.com/mattn/go-sqlite3 v1.14.16/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
-github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
-github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
@ -36,97 +26,56 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.18.0 h1:PGVlW0xEltQnzFZ55hkuX5+KLyrMYhHld1YHO4AKcdc=
 golang.org/x/crypto v0.18.0/go.mod h1:R0j02AL6hcrfOiy9T4ZYp/rcWeMxM3L6QYxlOuEG1mg=
-golang.org/x/crypto v0.22.0 h1:g1v0xeRhjcugydODzvb3mEM9SQ0HGp9s/nh3COQ/C30=
-golang.org/x/crypto v0.22.0/go.mod h1:vr6Su+7cTlO45qkww3VDJlzDn0ctJvRgYbC2NvXHt+M=
 golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
-golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
-golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
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