Fix Output Device toggle

internal/page/AudioOptions.go

@@ -15,7 +15,10 @@ import (
 	"rhemawavetech.com/rhemawave/internal/shaderManager"
 )
 
-const focusToggle = -1
+// focusToggle is the focus state of the audio on/off toggle, the bottommost
+// focusable item. Focus states increase from top to bottom on screen:
+// 0 = Audio Track entry, 1 = Output Device entry, focusToggle = toggle.
+const focusToggle = 2
 
 const triangleSize = float32(16)
 
@@ -325,6 +328,20 @@ func (p *AudioOptions) ToggleAudio() {
 	p.layout()
 }
 
+// moveFocus returns the focus state after moving by delta (1 = down, -1 = up)
+// on screen. Focus states run 0 (Audio Track) to focusToggle (toggle), so
+// navigation never skips the Output Device entry.
+func moveFocus(current, delta int) int {
+	next := current + delta
+	if next < 0 {
+		next = 0
+	}
+	if next > focusToggle {
+		next = focusToggle
+	}
+	return next
+}
+
 func (p *AudioOptions) HandleEvent(event *sdl.Event) error {
 	e, ok := (*event).(*sdl.KeyboardEvent)
 	if !ok || e.Type != sdl.KEYDOWN {
@@ -343,22 +360,12 @@ func (p *AudioOptions) HandleEvent(event *sdl.Event) error {
 		}
 
 	case sdl.K_DOWN:
-		if p.focusState == focusToggle {
+		p.focusState = moveFocus(p.focusState, 1)
-			p.focusState = 0
 		p.updateCursorPosition()
-		} else if p.focusState < 1 {
-			p.focusState++
-			p.updateCursorPosition()
-		}
 
 	case sdl.K_UP:
-		if p.focusState == 0 {
+		p.focusState = moveFocus(p.focusState, -1)
-			p.focusState = focusToggle
 		p.updateCursorPosition()
-		} else if p.focusState > 0 {
-			p.focusState--
-			p.updateCursorPosition()
-		}
 
 	case sdl.K_RIGHT:
 		p.UpdateVolume(10)

internal/page/AudioOptions_test.go

@@ -0,0 +1,29 @@
+package page
+
+import "testing"
+
+func TestMoveFocus(t *testing.T) {
+	tests := []struct {
+		name    string
+		current int
+		delta   int
+		want    int
+	}{
+		{"down from track goes to device", 0, 1, 1},
+		{"down from device goes to toggle", 1, 1, focusToggle},
+		{"down from toggle stays", focusToggle, 1, focusToggle},
+		{"up from toggle goes to device", focusToggle, -1, 1},
+		{"up from device goes to track", 1, -1, 0},
+		{"up from track stays", 0, -1, 0},
+		{"down does not overshoot below toggle", focusToggle, 5, focusToggle},
+		{"up does not undershoot above track", 0, -5, 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := moveFocus(tt.current, tt.delta); got != tt.want {
+				t.Errorf("moveFocus(%d, %d) = %d, want %d", tt.current, tt.delta, got, tt.want)
+			}
+		})
+	}
+}