turn player into primary if only one left

systems/player_system.go

@@ -32,6 +32,8 @@ func (system PlayerSystem) Update() error {
 	// first check if we need to switch player
 	switchable := false
 	query := system.Selector.Query(system.World)
+	count := query.Count()
+
 	for query.Next() {
 		_, _, player, _ := query.Get()
 		if !player.IsPrimary {
@@ -43,14 +45,22 @@ func (system PlayerSystem) Update() error {
 		query := system.Selector.Query(system.World)
 		for query.Next() {
 			_, _, player, render := query.Get()
-			if inpututil.IsKeyJustPressed(ebiten.KeyTab) {
-				slog.Debug("switch players")
-				if player.IsPrimary {
-					player.IsPrimary = false
-					render.Image = player.SwitchSprite()
-				} else {
-					player.IsPrimary = true
-					render.Image = player.SwitchSprite()
+
+			if count == 1 && !player.IsPrimary {
+				// there's only one player left, make it the primary one
+				player.IsPrimary = true
+				render.Image = player.SwitchSprite()
+			} else {
+				// many players, switch when requested
+				if inpututil.IsKeyJustPressed(ebiten.KeyTab) {
+					slog.Debug("switch players")
+					if player.IsPrimary {
+						player.IsPrimary = false
+						render.Image = player.SwitchSprite()
+					} else {
+						player.IsPrimary = true
+						render.Image = player.SwitchSprite()
+					}
 				}
 			}
 		}