1 files changed, 92 insertions, 0 deletions
diff --git a/internal/handlers/timeline_logic_test.go b/internal/handlers/timeline_logic_test.go
index 5fe995f..9a71741 100644
--- a/internal/handlers/timeline_logic_test.go
+++ b/internal/handlers/timeline_logic_test.go
@@ -162,3 +162,95 @@ func TestBuildTimeline(t *testing.T) {
 		t.Errorf("Expected item 3 to be Card, got %s", items[3].Type)
 	}
 }
+
+func TestCalcCalendarBounds(t *testing.T) {
+	tests := []struct {
+		name        string
+		items       []models.TimelineItem
+		currentHour int
+		wantStart   int
+		wantEnd     int
+	}{
+		{
+			name:        "no timed events returns default",
+			items:       []models.TimelineItem{},
+			currentHour: -1,
+			wantStart:   8,
+			wantEnd:     18,
+		},
+		{
+			name: "single event at 10am",
+			items: []models.TimelineItem{
+				{Time: time.Date(2023, 1, 1, 10, 0, 0, 0, time.UTC)},
+			},
+			currentHour: -1,
+			wantStart:   9,  // 1 hour buffer before
+			wantEnd:     11, // 1 hour buffer after
+		},
+		{
+			name: "includes current hour",
+			items: []models.TimelineItem{
+				{Time: time.Date(2023, 1, 1, 10, 0, 0, 0, time.UTC)},
+			},
+			currentHour: 8,
+			wantStart:   7,  // 1 hour before 8am
+			wantEnd:     11, // 1 hour after 10am
+		},
+		{
+			name: "event with end time extends range",
+			items: []models.TimelineItem{
+				{
+					Time:    time.Date(2023, 1, 1, 10, 0, 0, 0, time.UTC),
+					EndTime: timePtr(time.Date(2023, 1, 1, 14, 0, 0, 0, time.UTC)),
+				},
+			},
+			currentHour: -1,
+			wantStart:   9,  // 1 hour before 10am
+			wantEnd:     15, // 1 hour after 2pm end
+		},
+		{
+			name: "all-day events are skipped",
+			items: []models.TimelineItem{
+				{Time: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC), IsAllDay: true},
+			},
+			currentHour: -1,
+			wantStart:   8,
+			wantEnd:     18,
+		},
+		{
+			name: "overdue events are skipped",
+			items: []models.TimelineItem{
+				{Time: time.Date(2023, 1, 1, 10, 0, 0, 0, time.UTC), IsOverdue: true},
+			},
+			currentHour: -1,
+			wantStart:   8,
+			wantEnd:     18,
+		},
+		{
+			name: "clamps to 0-23 range",
+			items: []models.TimelineItem{
+				{Time: time.Date(2023, 1, 1, 0, 30, 0, 0, time.UTC)},
+				{Time: time.Date(2023, 1, 1, 23, 0, 0, 0, time.UTC)},
+			},
+			currentHour: -1,
+			wantStart:   0,  // Can't go below 0
+			wantEnd:     23, // Can't go above 23
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			start, end := calcCalendarBounds(tc.items, tc.currentHour)
+			if start != tc.wantStart {
+				t.Errorf("Expected start %d, got %d", tc.wantStart, start)
+			}
+			if end != tc.wantEnd {
+				t.Errorf("Expected end %d, got %d", tc.wantEnd, end)
+			}
+		})
+	}
+}
+
+func timePtr(t time.Time) *time.Time {
+	return &t
+}