From 70600a1142dcc56da960f05b92131d6e9847fb59 Mon Sep 17 00:00:00 2001
From: Luke Meyers <n.luke.meyers@gmail.com>
Date: Sat, 8 Feb 2020 20:39:10 -0800
Subject: [PATCH] run AI in separate goroutine

---
 game/ai.go       |  2 +-
 game/commands.go | 15 ++++++++++++++-
 main.go          | 13 ++++++-------
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/game/ai.go b/game/ai.go
index e5012eb..79eb921 100644
--- a/game/ai.go
+++ b/game/ai.go
@@ -1,6 +1,6 @@
 package game
 
-func ChooseCommand(s State, teamID int) Command {
+func chooseCommand(s State, teamID int) Command {
 	return chooseCommandHelper(s, teamID, aiDepth)
 }
 
diff --git a/game/commands.go b/game/commands.go
index cfdc675..ff36416 100644
--- a/game/commands.go
+++ b/game/commands.go
@@ -1,5 +1,9 @@
 package game
 
+import (
+	"log"
+)
+
 type Command int
 
 const (
@@ -12,9 +16,18 @@ const (
 
 var validCommands = []Command{speedUp, slowDown, left, right, clearObstacle}
 
+func PollCommands(s State) []Command {
+	cmds := make([]Command, len(s.Teams))
+	for i := range s.Teams {
+		cmd := chooseCommand(s, i)
+		log.Printf("team %d chose to %v", i, cmd)
+		cmds[i] = cmd
+	}
+	return cmds
+}
+
 func doCommand(cmd Command, s State, teamID int) State {
 	da := 1
-	//da += rand.Intn(3) - 1
 
 	r := ActiveRacer(s.Teams[teamID])
 	if r == nil {
diff --git a/main.go b/main.go
index ba8b85f..a82cae6 100644
--- a/main.go
+++ b/main.go
@@ -44,6 +44,9 @@ func run() error {
 		second = time.Tick(time.Second)
 	)
 
+	cmdC := make(chan []game.Command)
+	go func() { cmdC <- game.PollCommands(s) }()
+
 	for !w.Closed() && !s.GameOver {
 		switch {
 		case w.Pressed(pixelgl.KeyQ):
@@ -58,13 +61,7 @@ func run() error {
 			rs.Animating = true
 			rs.Frame = 0
 
-			cmds := make([]game.Command, len(s.Teams))
-			for i := range s.Teams {
-				cmd := game.ChooseCommand(s, i)
-				log.Printf("team %d chose to %v", i, cmd)
-				cmds[i] = cmd
-			}
-
+			cmds := <-cmdC
 			s = game.UpdateState(s, sOld, cmds)
 			turn++
 			if s.GameOver {
@@ -72,10 +69,12 @@ func run() error {
 				sOld = s
 				turn = 1
 			}
+			go func() { cmdC <- game.PollCommands(s) }()
 		}
 
 		w.Update()
 		frames++
+
 		select {
 		case <-second:
 			w.SetTitle(fmt.Sprintf("%s | FPS: %d", cfg.Title, frames))