Ignore events with "Show As = Free" when determining availability

chart/Chart.yaml

@@ -4,5 +4,5 @@ description: A Helm chart for Kubernetes
 
 type: application
 
-version: 0.2.5
-appVersion: "v0.2.5"
+version: 0.2.6
+appVersion: "v0.2.6"

internal/availability/availability.go

@@ -241,7 +241,7 @@ func loadLocation(name string) *time.Location {
 
 func blockIsFree(events []calendar.ParsedEvent, start, end time.Time, loc *time.Location) bool {
 	for _, event := range events {
-		if event.Cancelled {
+		if event.Cancelled || !event.Busy {
 			continue
 		}
 

internal/availability/availability_test.go

@@ -193,6 +193,43 @@ END:VCALENDAR`
 	}
 }
 
+func TestCompute_IgnoresTransparentEvents(t *testing.T) {
+	blocks := testBlocks(t)
+	body := `BEGIN:VCALENDAR
+VERSION:2.0
+X-WR-TIMEZONE:Europe/London
+BEGIN:VEVENT
+UID:free-morning
+DTSTART:20260406T090000
+DTEND:20260406T103000
+SUMMARY:Free morning
+TRANSP:TRANSPARENT
+END:VEVENT
+END:VCALENDAR`
+
+	opts := ComputeOptions{
+		WorkingHours:               testWorkingHours(t),
+		HolidayDates:               []string{"2026-04-06"},
+		ExcludeEnglandBankHolidays: true,
+		Now:                        londonTime(t, 2026, 4, 6, 8, 30),
+	}
+
+	entries, err := Compute(body, "Europe/London", blocks, opts)
+	if err != nil {
+		t.Fatalf("Compute: %v", err)
+	}
+	if len(entries) == 0 {
+		t.Fatal("expected availability entries")
+	}
+	// With the transparent event, the Morning block should still be available.
+	if got, want := entries[0].Date, "2026-04-06"; got != want {
+		t.Fatalf("first available date: got %q, want %q", got, want)
+	}
+	if got, want := entries[0].Block, "Morning"; got != want {
+		t.Fatalf("first available block: got %q, want %q", got, want)
+	}
+}
+
 func TestHandler_AuthorizationAndResponse(t *testing.T) {
 	st := newTestStore(t)
 	blocks := testBlocks(t)

internal/calendar/ical.go

@@ -19,6 +19,7 @@ type ParsedEvent struct {
 	StartTime time.Time
 	EndTime   time.Time
 	Cancelled bool
+	Busy      bool
 }
 
 // ParsedCalendar is the parsed representation of an iCal feed.
@@ -97,6 +98,7 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 		startTime time.Time
 		endTime   time.Time
 		cancelled bool
+		busy      bool
 		rrule     string
 	}
 
@@ -115,6 +117,11 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 		status := event.GetProperty(ics.ComponentPropertyStatus)
 		cancelled := status != nil && status.Value == "CANCELLED"
 
+		busy := true
+		if transp := event.GetProperty(ics.ComponentPropertyTransp); transp != nil {
+			busy = strings.ToUpper(transp.Value) == "OPAQUE"
+		}
+
 		startAt, err := event.GetStartAt()
 		if err != nil {
 			continue
@@ -133,6 +140,7 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 			startTime: startAt,
 			endTime:   endAt,
 			cancelled: cancelled,
+			busy:      busy,
 		}
 		if rruleProp := event.GetProperty(ics.ComponentPropertyRrule); rruleProp != nil {
 			base.rrule = rruleProp.Value
@@ -151,6 +159,7 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 					StartTime: base.startTime,
 					EndTime:   base.endTime,
 					Cancelled: base.cancelled,
+					Busy:      base.busy,
 				})
 			}
 			continue
@@ -174,6 +183,7 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 						StartTime: inst,
 						EndTime:   endAt,
 						Cancelled: base.cancelled,
+						Busy:      base.busy,
 					})
 				}
 				continue
@@ -187,6 +197,7 @@ func ParseICalendar(data []byte, windowStart, windowEnd time.Time) (*ParsedCalen
 				StartTime: base.startTime,
 				EndTime:   base.endTime,
 				Cancelled: base.cancelled,
+				Busy:      base.busy,
 			})
 		}
 	}

internal/calendar/ical_test.go

@@ -378,3 +378,64 @@ END:VCALENDAR`
 		t.Fatalf("timezone: got %q, want %q", tz, "Europe/London")
 	}
 }
+
+func TestParseICalendar_Transparency(t *testing.T) {
+	icalData := `BEGIN:VCALENDAR
+VERSION:2.0
+BEGIN:VEVENT
+UID:busy-event
+DTSTART:20260406T100000Z
+DTEND:20260406T110000Z
+SUMMARY:Busy Event
+TRANSP:OPAQUE
+END:VEVENT
+BEGIN:VEVENT
+UID:free-event
+DTSTART:20260406T120000Z
+DTEND:20260406T130000Z
+SUMMARY:Free Event
+TRANSP:TRANSPARENT
+END:VEVENT
+BEGIN:VEVENT
+UID:default-busy-event
+DTSTART:20260406T140000Z
+DTEND:20260406T150000Z
+SUMMARY:Default Busy Event
+END:VEVENT
+END:VCALENDAR`
+
+	now := time.Date(2026, 4, 6, 10, 0, 0, 0, time.UTC)
+	events, err := parseICalendar([]byte(icalData), now)
+	if err != nil {
+		t.Fatalf("parseICalendar: %v", err)
+	}
+
+	if len(events) != 3 {
+		t.Fatalf("expected 3 events, got %d", len(events))
+	}
+
+	tests := []struct {
+		summary string
+		busy    bool
+	}{
+		{"Busy Event", true},
+		{"Free Event", false},
+		{"Default Busy Event", true},
+	}
+
+	for _, tt := range tests {
+		found := false
+		for _, ev := range events {
+			if ev.Summary == tt.summary {
+				found = true
+				if ev.Busy != tt.busy {
+					t.Errorf("%s: Busy got %v, want %v", tt.summary, ev.Busy, tt.busy)
+				}
+				break
+			}
+		}
+		if !found {
+			t.Errorf("could not find event: %s", tt.summary)
+		}
+	}
+}