add JSON DTOs for game state

game/game.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 
 	"git.sunturtle.xyz/studio/shotgun/player"
+	"git.sunturtle.xyz/studio/shotgun/serve"
 )
 
 type Game struct {
@@ -105,7 +106,7 @@ func (g *Game) PopShell() bool {
 // Peek returns the current turn's shell if it is revealed for the player with
 // the given ID, or nil otherwise.
 func (g *Game) Peek(id player.ID) *bool {
-	if id != g.CurrentPlayer().ID || !g.Reveal {
+	if len(g.Shells) == 0 || id != g.CurrentPlayer().ID || !g.Reveal {
 		return nil
 	}
 	return &g.Shells[0]
@@ -150,4 +151,20 @@ func (g *Game) Shoot(id player.ID, self bool) error {
 	return nil
 }
 
+// DTO returns the current game state as viewed by the given player.
+func (g *Game) DTO(id player.ID) serve.Game {
+	return serve.Game{
+		Players: [2]serve.Player{
+			g.PP[0].DTO(),
+			g.PP[1].DTO(),
+		},
+		Round:    g.Round,
+		Group:    g.Group,
+		Turn:     g.Turn,
+		Damage:   g.Damage,
+		Shell:    g.Peek(id),
+		Previous: g.Prev,
+	}
+}
+
 var ErrWrongTurn = errors.New("not your turn")

game/player.go

@@ -4,6 +4,7 @@ import (
 	"slices"
 
 	"git.sunturtle.xyz/studio/shotgun/player"
+	"git.sunturtle.xyz/studio/shotgun/serve"
 )
 
 type Player struct {
@@ -29,6 +30,22 @@ func (p *Player) StartGroup(rng *RNG, items int) {
 	p.Cuffs = Uncuffed // TODO(zeph): or is this startround?
 }
 
+func (p *Player) DTO() serve.Player {
+	r := serve.Player{
+		HP:    p.HP,
+		Items: make([]string, 0, 8),
+		Cuffs: p.Cuffs != Uncuffed,
+	}
+	for _, i := range p.Items {
+		s := i.String()
+		if s == "" {
+			continue
+		}
+		r.Items = append(r.Items, s)
+	}
+	return r
+}
+
 type CuffState uint8
 
 const (