implement round end

game/game.go

@@ -70,11 +70,41 @@ func (g *Game) Apply(item int) {
 // PopShell removes a shell from the shotgun.
 // This may cause the shotgun to be empty, but does not start the next group
 // if so.
-func (g *Game) PopShell() {
+func (g *Game) PopShell() bool {
+	r := g.Shells[0]
 	g.Shells = g.Shells[1:]
+	return r
 }
 
 // Empty returns whether the shotgun is empty.
 func (g *Game) Empty() bool {
 	return len(g.Shells) == 0
 }
+
+// Winner returns the player who won, or nil if the round is not over.
+func (g *Game) Winner() *Player {
+	if g.PP[0].HP <= 0 {
+		return &g.PP[1]
+	}
+	if g.PP[1].HP <= 0 {
+		return &g.PP[0]
+	}
+	return nil
+}
+
+// Shoot fires the shotgun, at the opponent if self is false and at the current
+// player if self is true. Afterward, the round may be over, or the shotgun may
+// be empty.
+func (g *Game) Shoot(self bool) {
+	target := g.Opponent()
+	if self {
+		target = g.CurrentPlayer()
+	}
+	live := g.PopShell()
+	if live {
+		target.HP -= g.Damage
+		g.Turn++
+	} else if !self {
+		g.Turn++
+	}
+}