first commit

backend/app/services/calendar.py

@@ -0,0 +1,38 @@
+from datetime import datetime, timedelta, timezone
+
+from app.models import EventEdition
+
+
+def _fmt_ics(dt: datetime) -> str:
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    return dt.strftime("%Y%m%dT%H%M%SZ")
+
+
+def build_ics(edition: EventEdition, page_url: str) -> str:
+    start = edition.event_date or datetime.now(timezone.utc) + timedelta(days=7)
+    end = start + timedelta(hours=4)
+    uid = f"desi-clans-{edition.slug}@bengaluru"
+    location = edition.venue_name or edition.city
+    summary = edition.title.replace(",", "\\,")
+    desc = (edition.meta_description or edition.description or edition.title).replace("\n", "\\n")
+
+    lines = [
+        "BEGIN:VCALENDAR",
+        "VERSION:2.0",
+        "PRODID:-//Desi Clans//Bengaluru Events//EN",
+        "CALSCALE:GREGORIAN",
+        "METHOD:PUBLISH",
+        "BEGIN:VEVENT",
+        f"UID:{uid}",
+        f"DTSTAMP:{_fmt_ics(datetime.now(timezone.utc))}",
+        f"DTSTART:{_fmt_ics(start)}",
+        f"DTEND:{_fmt_ics(end)}",
+        f"SUMMARY:{summary}",
+        f"DESCRIPTION:{desc} — {page_url}",
+        f"LOCATION:{location}",
+        f"URL:{page_url}",
+        "END:VEVENT",
+        "END:VCALENDAR",
+    ]
+    return "\r\n".join(lines) + "\r\n"