fix(deepwork): implement todaysAccum stub + tests

src/infer/deepwork.ts

@@ -7,15 +7,20 @@
  * cogsync (調査) report/02-cognition.md 参照。
  */
 
+import { ymd } from "./work_state.ts";
+
 export type DeepWorkAccum = {
   date: string; // YYYY-MM-DD
   totalMin: number;
   spans: { startedAt: Date; endedAt: Date; min: number }[];
 };
 
-export function todaysAccum(_now: Date, _spans: DeepWorkAccum["spans"]): DeepWorkAccum {
-  // TODO v0.2
-  throw new Error("todaysAccum not implemented (v0.2)");
+export function todaysAccum(now: Date, spans: DeepWorkAccum["spans"]): DeepWorkAccum {
+  // 「当日」= now のローカル日付。span はその開始日 (startedAt) でその日に属すと判定する。
+  const date = ymd(now);
+  const todays = spans.filter((s) => ymd(s.startedAt) === date);
+  const totalMin = Math.round(todays.reduce((sum, s) => sum + s.min, 0));
+  return { date, totalMin, spans: todays };
 }
 
 export function shouldWarnDailyCap(_accum: DeepWorkAccum, _capMin: number): boolean {

src/infer/work_state.ts

@@ -231,7 +231,7 @@ function emptyBuckets(): DeepWorkBuckets {
   return { manual: 0, auto: 0, bypass: 0 };
 }
 
-function ymd(d: Date): string {
+export function ymd(d: Date): string {
   const y = d.getFullYear();
   const m = String(d.getMonth() + 1).padStart(2, "0");
   const day = String(d.getDate()).padStart(2, "0");

tests/todays-accum.test.ts

@@ -0,0 +1,49 @@
+import { test } from "node:test";
+import { strict as assert } from "node:assert";
+import { todaysAccum } from "../src/infer/deepwork.ts";
+
+// Date はローカル成分で構築する（ymd がローカル日付を使うため、TZ 非依存にする）。
+const span = (y: number, mo: number, d: number, h: number, mi: number, min: number) => ({
+  startedAt: new Date(y, mo - 1, d, h, mi),
+  endedAt: new Date(y, mo - 1, d, h, mi + min),
+  min,
+});
+
+test("todaysAccum: 当日の span だけ合計し、前日・翌日は除外する", () => {
+  const now = new Date(2026, 4, 9, 12, 0); // 2026-05-09 ローカル
+  const spans = [
+    span(2026, 5, 9, 9, 0, 30), // 当日 +30
+    span(2026, 5, 9, 13, 0, 15), // 当日 +15
+    span(2026, 5, 8, 23, 0, 45), // 前日 → 除外
+    span(2026, 5, 10, 1, 0, 20), // 翌日 → 除外
+  ];
+  const acc = todaysAccum(now, spans);
+  assert.equal(acc.date, "2026-05-09");
+  assert.equal(acc.totalMin, 45); // 30 + 15 のみ
+  assert.equal(acc.spans.length, 2);
+});
+
+test("todaysAccum: span が無ければ totalMin=0 / spans=[]（throw しない）", () => {
+  const now = new Date(2026, 4, 9, 12, 0);
+  const acc = todaysAccum(now, []);
+  assert.equal(acc.date, "2026-05-09");
+  assert.equal(acc.totalMin, 0);
+  assert.deepEqual(acc.spans, []);
+});
+
+test("todaysAccum: 端数分は合計後に四捨五入する", () => {
+  const now = new Date(2026, 4, 9, 12, 0);
+  const spans = [span(2026, 5, 9, 9, 0, 1.4), span(2026, 5, 9, 10, 0, 1.4)];
+  const acc = todaysAccum(now, spans);
+  assert.equal(acc.totalMin, 3); // 2.8 → 3
+});
+
+test("todaysAccum: startedAt が当日なら endedAt が翌日でも当日に丸ごと計上（跨ぎ仕様）", () => {
+  const now = new Date(2026, 4, 9, 12, 0);
+  const spans = [
+    { startedAt: new Date(2026, 4, 9, 23, 50), endedAt: new Date(2026, 4, 10, 0, 20), min: 30 },
+  ];
+  const acc = todaysAccum(now, spans);
+  assert.equal(acc.totalMin, 30); // startedAt 基準で当日に全量
+  assert.equal(acc.spans.length, 1);
+});