Add /spawn command to let an account spawn it's primary instance

pkg/game/world.go

@@ -1,20 +1,30 @@
 package game
 
-import "github.com/google/uuid"
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+)
 
 // World describes a self contained universe and everything in it
 type World struct {
-	instances []Instance
+	instances map[uuid.UUID]Instance
 }
 
 // Instance describes a single entity or instance of an entity in the world
 type Instance struct {
+	// id is a unique ID for this instance
 	id uuid.UUID
+
+	// pos represents where this instance is in the world
+	pos Position
 }
 
 // NewWorld creates a new world object
 func NewWorld() *World {
-	return &World{}
+	return &World{
+		instances: make(map[uuid.UUID]Instance),
+	}
 }
 
 // Adds an instance to the game
@@ -27,7 +37,16 @@ func (w *World) CreateInstance() uuid.UUID {
 	}
 
 	// Append the instance to the list
-	w.instances = append(w.instances, instance)
+	w.instances[id] = instance
 
 	return id
 }
+
+// GetPosition returns the position of a given instance
+func (w World) GetPosition(id uuid.UUID) (Position, error) {
+	if i, ok := w.instances[id]; ok {
+		return i.pos, nil
+	} else {
+		return Position{}, fmt.Errorf("no instance matching id")
+	}
+}

pkg/game/world_test.go

@@ -20,5 +20,7 @@ func TestWorld_CreateInstance(t *testing.T) {
 	// Basic duplicate check
 	if a == b {
 		t.Errorf("Created identical instances")
+	} else if len(world.instances) != 2 {
+		t.Errorf("Incorrect number of instances created")
 	}
 }