Integrated attendance system

ui/src/api/calendar.ts

@@ -33,7 +33,7 @@ export async function getMonthCalendarEvents(viewedMonth: Date): Promise<Calenda
 
     // Base range: first and last day of the month
     const firstOfMonth = new Date(year, month, 1);
-    const lastOfMonth  = new Date(year, month + 1, 0);
+    const lastOfMonth = new Date(year, month + 1, 0);
 
     // --- Apply 10 day padding ---
     const start = new Date(firstOfMonth);
@@ -44,7 +44,7 @@ export async function getMonthCalendarEvents(viewedMonth: Date): Promise<Calenda
     end.setHours(23, 59, 59, 999);
 
     const from = start.toISOString();
-    const to   = end.toISOString();
+    const to = end.toISOString();
 
     const url = `${addr}/calendar?from=${encodeURIComponent(from)}&to=${encodeURIComponent(to)}`;
 
@@ -60,7 +60,7 @@ export async function getMonthCalendarEvents(viewedMonth: Date): Promise<Calenda
 export async function getCalendarEvent(id: number): Promise<CalendarEvent> {
     let res = await fetch(`${addr}/calendar/${id}`);
 
-    if(res.ok) {
+    if (res.ok) {
         return await res.json();
     } else {
         throw new Error(`Failed to fetch event: ${res.status} ${res.statusText}`);
@@ -84,5 +84,14 @@ export async function adminCancelCalendarEvent(eventID: number) {
 }
 
 export async function setCalendarEventAttendance(eventID: number, state: CalendarAttendance) {
+    let res = await fetch(`${addr}/calendar/    ${eventID}/attendance?state=${state}`, {
+        method: "POST",
+        credentials: "include",
+    });
 
+    if (res.ok) {
+        return;
+    } else {    
+        throw new Error(`Failed to set attendance: ${res.status} ${res.statusText}`);
+    }
 }