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)
			}
		})
	}
}