feat: TIL을 생성하거나 Plan 완료 시 금일 날짜를 ID로 Count 집계 문서 생성

Author: moo1677

services/heatmap/dailyStat.service.ts

@@ -0,0 +1,44 @@
+import { doc, runTransaction, serverTimestamp } from 'firebase/firestore';
+import { db } from '@/lib/firebase';
+
+function dateKeyKST(date = new Date()) {
+  const kst = new Date(date.getTime() + 9 * 60 * 60 * 1000);
+  return kst.toISOString().slice(0, 10);
+}
+
+export async function bumpDailyStat(
+  uid: string,
+  deltaTil: number,
+  deltaTodoDone: number
+) {
+  const key = dateKeyKST();
+  const ref = doc(db, `users/${uid}/dailyStats/${key}`);
+
+  await runTransaction(db, async (tx) => {
+    const snap = await tx.get(ref);
+
+    const prev = snap.exists()
+      ? (snap.data() as {
+          tilCount?: number;
+          todoDoneCount?: number;
+          total?: number;
+        })
+      : {};
+
+    const nextTil = Math.max(0, (prev.tilCount ?? 0) + deltaTil);
+    const nextTodo = Math.max(0, (prev.todoDoneCount ?? 0) + deltaTodoDone);
+    const nextTotal = Math.max(0, nextTil + nextTodo);
+
+    tx.set(
+      ref,
+      {
+        date: key,
+        tilCount: nextTil,
+        todoDoneCount: nextTodo,
+        total: nextTotal,
+        updatedAt: serverTimestamp(),
+      },
+      { merge: true }
+    );
+  });
+}