added csv exporting logic

web/src/lib/Day.ts

@@ -0,0 +1,31 @@
+export type Day = number;
+
+export interface AttendanceDay {
+  date: Day,
+  ids: string[],
+}
+
+export function dayToDate(day: Day): Date {
+  const SEC_PER_DAY = 86_400;
+
+  return new Date(day * SEC_PER_DAY * 1000);
+}
+
+export async function fetchDay(day: Day): Promise<AttendanceDay> {
+  let res = await fetch("/api/day?" + (new URLSearchParams({ day: day.toString() }).toString()));
+
+  let json = await res.json();
+
+  return json;
+}
+
+export async function fetchDays(from: Date, to: Date): Promise<Day[]> {
+  let q = new URLSearchParams({ from: (from.getTime() / 1000).toString(), to: (to.getTime() / 1000).toString() });
+
+  let res = await fetch("/api/days?" + q);
+
+  let json = await res.json();
+
+  return json;
+}
+