feat: #31 page optimize

backend/src/features/task-decompose/task-calendar.service.ts

@@ -3,6 +3,7 @@ import type {
   TaskDecomposeRequest,
   TaskDecomposeResult,
 } from "./task-decompose.types";
+import { normalizeTaskTimezone } from "./task-timezone";
 import type {
   CalendarCreatedEvent,
   CalendarSyncResult,
@@ -51,6 +52,23 @@ function buildEventSummary(
   return `[${index + 1}/${totalCount}] ${normalizedSubtask} | ${normalizedOverall}`;
 }
 
+function toOverallTaskName(
+  requestTask: string,
+  breakdown: TaskDecomposeResult,
+): string {
+  const summary = toSingleLine(breakdown.summary ?? "");
+  if (summary.length > 0) {
+    return summary;
+  }
+
+  const goal = toSingleLine(breakdown.goal ?? "");
+  if (goal.length > 0) {
+    return goal;
+  }
+
+  return toSingleLine(requestTask);
+}
+
 function safeDate(value: string, fallback: Date): Date {
   const parsed = new Date(value);
   if (Number.isNaN(parsed.getTime())) {
@@ -279,8 +297,12 @@ export async function createCalendarEvents(
   input: CreateCalendarEventsInput,
 ): Promise<CalendarSyncResult> {
   const accessToken = await getGoogleAccessToken(env, input.userId);
-  const timezone = input.request.timezone ?? "UTC";
+  const timezone = normalizeTaskTimezone(input.request.timezone);
   const calendarId = PRIMARY_CALENDAR_ID;
+  const overallTaskName = toOverallTaskName(
+    input.request.task,
+    input.breakdown,
+  );
 
   const createdEvents: CalendarCreatedEvent[] = [];
   const totalCount = Math.max(input.breakdown.subtasks.length, 1);
@@ -296,7 +318,7 @@ export async function createCalendarEvents(
     const eventId = await createStableEventId(input.workflowId, index);
     const summary = buildEventSummary(
       subtask.title,
-      input.request.task,
+      overallTaskName,
       index,
       totalCount,
     );

backend/src/features/task-decompose/task-decompose.service.ts

@@ -3,13 +3,13 @@ import type {
   TaskDecomposeResult,
   TaskSubtask,
 } from "./task-decompose.types";
+import { normalizeTaskTimezone } from "./task-timezone";
 
 const AI_MODEL = "@cf/meta/llama-3.1-8b-instruct-fp8";
 const DEFAULT_MAX_STEPS = 6;
 const MIN_DURATION_MINUTES = 15;
 const MAX_DURATION_MINUTES = 240;
 const DEFAULT_INFERRED_DEADLINE_DAYS = 7;
-const DEFAULT_PLANNING_TIMEZONE = "Asia/Tokyo";
 
 function asStringArray(value: unknown): string[] {
   if (!Array.isArray(value)) {
@@ -76,14 +76,6 @@ function fallbackSummary(task: string): string {
   return `"${task}" を実行可能な単位へ分解した計画です。`;
 }
 
-function normalizeTimezone(timezone: string | undefined): string {
-  if (!timezone || timezone.trim().length === 0) {
-    return DEFAULT_PLANNING_TIMEZONE;
-  }
-
-  return timezone.trim();
-}
-
 function formatPromptDateInTimezone(date: Date, timezone: string): string {
   try {
     return new Intl.DateTimeFormat("en-CA", {
@@ -260,7 +252,7 @@ function normalizeResult(
 
 function createPrompt(payload: TaskDecomposeRequest): string {
   const maxSteps = payload.maxSteps ?? DEFAULT_MAX_STEPS;
-  const planningTimezone = normalizeTimezone(payload.timezone);
+  const planningTimezone = normalizeTaskTimezone(payload.timezone);
   const now = new Date();
 
   const deadlineGuidance = payload.deadline

backend/src/features/task-decompose/task-decompose.types.ts

@@ -7,6 +7,13 @@ export type TaskDecomposeRequest = {
   maxSteps?: number;
 };
 
+export type ValidatedTaskDecomposeRequest = Omit<
+  TaskDecomposeRequest,
+  "timezone"
+> & {
+  timezone: string;
+};
+
 export type TaskSubtask = {
   title: string;
   description: string;

backend/src/features/task-decompose/task-decompose.validation.ts

@@ -1,4 +1,5 @@
-import type { TaskDecomposeRequest } from "./task-decompose.types";
+import type { ValidatedTaskDecomposeRequest } from "./task-decompose.types";
+import { normalizeTaskTimezone } from "./task-timezone";
 
 const MAX_STEPS_LIMIT = 12;
 
@@ -20,17 +21,12 @@ function parseDeadline(value: unknown): string | undefined {
   return parsed.toISOString();
 }
 
-function parseTimezone(value: unknown): string | undefined {
+function parseTimezone(value: unknown): string {
   if (typeof value !== "string") {
-    return undefined;
-  }
-
-  const trimmed = value.trim();
-  if (trimmed.length === 0) {
-    return undefined;
+    return normalizeTaskTimezone(undefined);
   }
 
-  return trimmed;
+  return normalizeTaskTimezone(value);
 }
 
 function parseMaxSteps(value: unknown): number | undefined {
@@ -46,7 +42,9 @@ function parseMaxSteps(value: unknown): number | undefined {
   return Math.min(rounded, MAX_STEPS_LIMIT);
 }
 
-export function toRequestPayload(input: unknown): TaskDecomposeRequest | null {
+export function toRequestPayload(
+  input: unknown,
+): ValidatedTaskDecomposeRequest | null {
   if (!input || typeof input !== "object") {
     return null;
   }

backend/src/features/task-decompose/task-timezone.ts

@@ -0,0 +1,18 @@
+const DEFAULT_TASK_TIMEZONE = "Asia/Tokyo";
+
+export function normalizeTaskTimezone(
+  value: string | null | undefined,
+): string {
+  if (!value || value.trim().length === 0) {
+    return DEFAULT_TASK_TIMEZONE;
+  }
+
+  const candidate = value.trim();
+  try {
+    return new Intl.DateTimeFormat("en-US", {
+      timeZone: candidate,
+    }).resolvedOptions().timeZone;
+  } catch {
+    return DEFAULT_TASK_TIMEZONE;
+  }
+}