Merge pull request #90 from allinbits/feat/support-calendar-links

Feat/support calendar links

Author: stackdump

projects/gnoland/gno.land/p/eve000/event/component/calendar.gno

@@ -0,0 +1,102 @@
+package component
+
+import (
+    "net/url"
+    "strings"
+    "strconv"
+    "time"
+
+    "gno.land/p/demo/ufmt"
+)
+
+func CalenderDataUrl(path string, a *Flyer) string {
+    if path == "" {
+        path = "?format=ics"
+    }
+	data := IcsCalendarFile(path, a)
+	return "data:text/calendar;charset=utf-8," + url.QueryEscape(data)
+}
+
+func IcsCalendarFile(path string, a *Flyer) string {
+	var f = ufmt.Sprintf
+	var b strings.Builder
+	w := func(s string) {
+		b.WriteString(s + "\n")
+	}
+
+	q := ParseQuery(path)
+	sessionIDs := q["session"]
+	format := strings.ToLower(q.Get("format"))
+
+	useAll := len(sessionIDs) == 0
+	allowed := make(map[string]bool)
+	for _, id := range sessionIDs {
+		allowed[id] = true
+	}
+	include := func(id string) bool { return useAll || allowed[id] }
+
+	switch format {
+	case "json":
+		b.WriteString(a.ToJson())
+		return b.String()
+
+	case "ics":
+		w("BEGIN:VCALENDAR")
+		w("VERSION:2.0")
+		w("CALSCALE:GREGORIAN")
+		w("PRODID:-//gno.land//Launch Calendar//EN")
+		w("METHOD:PUBLISH\n")
+
+		w("BEGIN:VEVENT")
+		w(f("UID:event-%s@%s", slugify(a.Name), "gno.land/r/buidlthefuture000/events/gnolandlaunch/calendar"))
+		w("SEQUENCE:0")
+		w(f("DTSTAMP:%s", time.Now().UTC().Format("20060102T150405Z")))
+		w(f("DTSTART;VALUE=DATE:%s", a.StartDate.Format("20060102")))
+		w(f("DTEND;VALUE=DATE:%s", a.StartDate.AddDate(0, 0, 1).Format("20060102"))) // 👈 Fix: DTEND is exclusive
+		w(f("SUMMARY:%s", a.Name))
+		w(f("DESCRIPTION:%s", a.Description))
+		if a.Location != nil && a.Location.Name != "" {
+			w(f("LOCATION:%s", a.Location.Name))
+		}
+		w("END:VEVENT\n")
+
+		for i, s := range a.Sessions {
+			id := Pad3(strconv.Itoa(i))
+			if !include(id) {
+				continue
+			}
+
+			w("BEGIN:VEVENT")
+			w(f("UID:%s-%d@%s",
+				slugify(s.Title)[:5],
+				s.StartTime.Unix(),
+				"gno.land/r/buidlthefuture000/events/gnolandlaunch/calendar",
+			))
+			w(f("SEQUENCE:%d", s.Sequence))
+			w(f("DTSTAMP:%s", time.Now().UTC().Format("20060102T150405Z")))
+			w(f("DTSTART:%s", s.StartTime.UTC().Format("20060102T150000Z")))
+			w(f("DTEND:%s", s.EndTime.UTC().Format("20060102T150000Z")))
+			w(f("SUMMARY:%s", s.Title))
+			w(f("DESCRIPTION:%s", s.Description))
+			w(f("LOCATION:%s", s.Location.Name))
+			if s.Cancelled {
+				w("STATUS:CANCELLED")
+			}
+			w("END:VEVENT\n")
+		}
+
+		w("END:VCALENDAR")
+		return b.String()
+
+	default:
+		w(f("# %s\n\n%s", a.Name, a.Description))
+		for i, s := range a.Sessions {
+			id := Pad3(strconv.Itoa(i))
+			if !include(id) {
+				continue
+			}
+			w(s.ToMarkdown())
+		}
+		return b.String()
+	}
+}