Implement GET /api/today endpoint (P1.4)

Add the core daily snapshot API that powers the dashboard. Returns: - Training decision (status, reason, icon) using decision engine - Cycle data (cycleDay, phase, phaseConfig, daysUntilNextPhase) - Biometrics (hrvStatus, bodyBattery, weekIntensity, phaseLimit) - Nutrition guidance (seeds, carbRange, ketoGuidance) When no DailyLog exists (Garmin not synced), returns sensible defaults: hrvStatus="Unknown", bodyBattery=100, weekIntensity=0. This allows the app to function without Garmin integration. 22 tests covering auth, validation, all decision paths, override handling, phase-specific logic, and nutrition guidance. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-10 19:03:13 +00:00
parent b6285e3c01
commit 949cb1671a
3 changed files with 634 additions and 9 deletions
--- a/IMPLEMENTATION_PLAN.md
+++ b/IMPLEMENTATION_PLAN.md
@@ -29,7 +29,7 @@ This file is maintained by Ralph. Run `./ralph-sandbox.sh plan 3` to generate ta
 | PATCH /api/user | 501 | Returns Not Implemented |
 | POST /api/cycle/period | **COMPLETE** | Logs period start, updates user, creates PeriodLog (8 tests) |
 | GET /api/cycle/current | **COMPLETE** | Returns cycle day, phase, config, daysUntilNextPhase (10 tests) |
-| GET /api/today | 501 | Returns Not Implemented |
+| GET /api/today | **COMPLETE** | Returns decision, cycle, biometrics, nutrition (22 tests) |
 | POST /api/overrides | 501 | Returns Not Implemented |
 | DELETE /api/overrides | 501 | Returns Not Implemented |
 | POST /api/garmin/tokens | 501 | Returns Not Implemented |
@@ -73,6 +73,7 @@ This file is maintained by Ralph. Run `./ralph-sandbox.sh plan 3` to generate ta
 | `src/app/api/user/route.test.ts` | **EXISTS** - 4 tests (GET profile, auth, sensitive field exclusion) |
 | `src/app/api/cycle/period/route.test.ts` | **EXISTS** - 8 tests (POST period, auth, validation, date checks) |
 | `src/app/api/cycle/current/route.test.ts` | **EXISTS** - 10 tests (GET current cycle, auth, all phases, rollover, custom lengths) |
+| `src/app/api/today/route.test.ts` | **EXISTS** - 22 tests (daily snapshot, auth, decision, overrides, phases, nutrition, biometrics) |
 | `src/lib/nutrition.test.ts` | **MISSING** |
 | `src/lib/email.test.ts` | **MISSING** |
 | `src/lib/ics.test.ts` | **MISSING** |
@@ -176,12 +177,17 @@ Minimum viable product - app can be used for daily decisions.
 - **Why:** Dashboard needs this for display
 - **Depends On:** P0.1, P0.2, P1.2

-### P1.4: GET /api/today Implementation
- [ ] Return complete daily snapshot with decision, biometrics, nutrition
+### P1.4: GET /api/today Implementation ✅ COMPLETE
+- [x] Return complete daily snapshot with decision, biometrics, nutrition
 - **Files:**
-  - `src/app/api/today/route.ts` - Implement GET aggregating all data sources
+  - `src/app/api/today/route.ts` - Implemented GET with `withAuth()` wrapper, aggregates cycle, biometrics, and nutrition
 - **Tests:**
-  - `src/app/api/today/route.test.ts` - Test decision computation, data assembly
+  - `src/app/api/today/route.test.ts` - 22 tests covering auth, validation, decision calculation, overrides, phases, nutrition
+- **Response Shape:**
+  - `decision` (status, reason, icon), `cycleDay`, `phase`, `phaseConfig`, `daysUntilNextPhase`, `cycleLength`
+  - `biometrics` (hrvStatus, bodyBatteryCurrent, bodyBatteryYesterdayLow, weekIntensityMinutes, phaseLimit)
+  - `nutrition` (seeds, carbRange, ketoGuidance)
+- **Fallback Behavior:** When no DailyLog exists (Garmin not synced), returns defaults: hrvStatus="Unknown", BB=100, weekIntensity=0
 - **Why:** This is THE core API for the dashboard
 - **Depends On:** P0.1, P0.2, P0.3, P1.3

@@ -487,6 +493,7 @@ P2.14 Mini calendar
 - [x] **GET /api/user** - Returns authenticated user profile, 4 tests (P0.4)
 - [x] **POST /api/cycle/period** - Logs period start date, updates user, creates PeriodLog, 8 tests (P1.2)
 - [x] **GET /api/cycle/current** - Returns cycle day, phase, phaseConfig, daysUntilNextPhase, cycleLength, 10 tests (P1.3)
+- [x] **GET /api/today** - Returns complete daily snapshot with decision, biometrics, nutrition, 22 tests (P1.4)

 ---

--- a/src/app/api/today/route.test.ts
+++ b/src/app/api/today/route.test.ts
@@ -0,0 +1,519 @@
+// ABOUTME: Unit tests for today's daily snapshot API route.
+// ABOUTME: Tests GET /api/today for decision, biometrics, and nutrition data.
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import type { DailyLog, User } from "@/types";
+
+// Module-level variable to control mock user in tests
+let currentMockUser: User | null = null;
+
+// Module-level variable to control mock daily log in tests
+let currentMockDailyLog: DailyLog | null = null;
+
+// Mock PocketBase client for database operations
+vi.mock("@/lib/pocketbase", () => ({
+  createPocketBaseClient: vi.fn(() => ({
+    collection: vi.fn(() => ({
+      getFirstListItem: vi.fn(async () => {
+        if (!currentMockDailyLog) {
+          const error = new Error("No DailyLog found");
+          (error as { status?: number }).status = 404;
+          throw error;
+        }
+        return currentMockDailyLog;
+      }),
+    })),
+  })),
+  loadAuthFromCookies: vi.fn(),
+  isAuthenticated: vi.fn(() => currentMockUser !== null),
+  getCurrentUser: vi.fn(() => currentMockUser),
+}));
+
+// Mock the auth-middleware module
+vi.mock("@/lib/auth-middleware", () => ({
+  withAuth: vi.fn((handler) => {
+    return async (request: NextRequest) => {
+      if (!currentMockUser) {
+        return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+      }
+      return handler(request, currentMockUser);
+    };
+  }),
+}));
+
+import { GET } from "./route";
+
+describe("GET /api/today", () => {
+  const createMockUser = (overrides: Partial<User> = {}): User => ({
+    id: "user123",
+    email: "test@example.com",
+    garminConnected: false,
+    garminOauth1Token: "",
+    garminOauth2Token: "",
+    garminTokenExpiresAt: new Date("2025-06-01"),
+    calendarToken: "cal-secret-token",
+    lastPeriodDate: new Date("2025-01-01"),
+    cycleLength: 31,
+    notificationTime: "07:00",
+    timezone: "America/New_York",
+    activeOverrides: [],
+    created: new Date("2024-01-01"),
+    updated: new Date("2025-01-10"),
+    ...overrides,
+  });
+
+  const createMockDailyLog = (overrides: Partial<DailyLog> = {}): DailyLog => ({
+    id: "log123",
+    user: "user123",
+    date: new Date("2025-01-10"),
+    cycleDay: 10,
+    phase: "FOLLICULAR",
+    bodyBatteryCurrent: 85,
+    bodyBatteryYesterdayLow: 40,
+    hrvStatus: "Balanced",
+    weekIntensityMinutes: 45,
+    phaseLimit: 120,
+    remainingMinutes: 75,
+    trainingDecision: "TRAIN",
+    decisionReason: "All systems go",
+    notificationSentAt: null,
+    created: new Date("2025-01-10"),
+    ...overrides,
+  });
+
+  const mockRequest = {} as NextRequest;
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    currentMockUser = null;
+    currentMockDailyLog = null;
+    // Mock current date to 2025-01-10 for predictable testing
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2025-01-10T12:00:00Z"));
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  describe("authentication", () => {
+    it("returns 401 when not authenticated", async () => {
+      currentMockUser = null;
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(401);
+      const body = await response.json();
+      expect(body.error).toBe("Unauthorized");
+    });
+  });
+
+  describe("validation", () => {
+    it("returns 400 when user has no lastPeriodDate", async () => {
+      currentMockUser = createMockUser({
+        lastPeriodDate: null as unknown as Date,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(400);
+      const body = await response.json();
+      expect(body.error).toContain("lastPeriodDate");
+    });
+  });
+
+  describe("response structure", () => {
+    it("returns complete daily snapshot with all required fields", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      // Decision fields
+      expect(body).toHaveProperty("decision");
+      expect(body.decision).toHaveProperty("status");
+      expect(body.decision).toHaveProperty("reason");
+      expect(body.decision).toHaveProperty("icon");
+
+      // Cycle fields
+      expect(body).toHaveProperty("cycleDay");
+      expect(body).toHaveProperty("phase");
+      expect(body).toHaveProperty("phaseConfig");
+      expect(body).toHaveProperty("daysUntilNextPhase");
+      expect(body).toHaveProperty("cycleLength");
+
+      // Biometric fields
+      expect(body).toHaveProperty("biometrics");
+      expect(body.biometrics).toHaveProperty("hrvStatus");
+      expect(body.biometrics).toHaveProperty("bodyBatteryCurrent");
+      expect(body.biometrics).toHaveProperty("bodyBatteryYesterdayLow");
+      expect(body.biometrics).toHaveProperty("weekIntensityMinutes");
+      expect(body.biometrics).toHaveProperty("phaseLimit");
+
+      // Nutrition fields
+      expect(body).toHaveProperty("nutrition");
+      expect(body.nutrition).toHaveProperty("seeds");
+      expect(body.nutrition).toHaveProperty("carbRange");
+      expect(body.nutrition).toHaveProperty("ketoGuidance");
+    });
+  });
+
+  describe("decision calculation", () => {
+    it("returns TRAIN when all biometrics are good", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 30,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("TRAIN");
+      expect(body.decision.icon).toBe("✅");
+    });
+
+    it("returns REST when HRV is unbalanced", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Unbalanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("HRV");
+    });
+
+    it("returns REST when body battery was depleted yesterday", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 25, // Below 30 threshold
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("depleted");
+    });
+
+    it("returns LIGHT when current body battery is low", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 70, // Below 75 threshold
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 30,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("LIGHT");
+    });
+
+    it("returns REDUCED when current body battery is medium", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 80, // Between 75 and 85
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 30,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REDUCED");
+    });
+
+    it("returns REST when weekly limit is reached", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 125, // Above 120 limit for FOLLICULAR
+        phaseLimit: 120,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("WEEKLY LIMIT");
+    });
+  });
+
+  describe("override handling", () => {
+    it("returns REST with flare override active", async () => {
+      currentMockUser = createMockUser({
+        activeOverrides: ["flare"],
+      });
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("flare");
+    });
+
+    it("returns REST with stress override active", async () => {
+      currentMockUser = createMockUser({
+        activeOverrides: ["stress"],
+      });
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("stress");
+    });
+
+    it("prioritizes flare over stress when both active", async () => {
+      currentMockUser = createMockUser({
+        activeOverrides: ["stress", "flare"],
+      });
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.decision.status).toBe("REST");
+      expect(body.decision.reason).toContain("flare");
+    });
+  });
+
+  describe("cycle data", () => {
+    it("returns correct cycle day and phase", async () => {
+      // lastPeriodDate: 2025-01-01, current: 2025-01-10 = cycle day 10
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2025-01-01"),
+        cycleLength: 31,
+      });
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.cycleDay).toBe(10);
+      expect(body.phase).toBe("FOLLICULAR");
+      expect(body.cycleLength).toBe(31);
+    });
+
+    it("returns phase configuration", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.phaseConfig.name).toBe("FOLLICULAR");
+      expect(body.phaseConfig.weeklyLimit).toBe(120);
+    });
+
+    it("returns days until next phase", async () => {
+      // Cycle day 10 in FOLLICULAR (days 4-14)
+      // Next phase (OVULATION) starts day 15, so 5 days away
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2025-01-01"),
+      });
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.daysUntilNextPhase).toBe(5);
+    });
+  });
+
+  describe("phase-specific decisions", () => {
+    it("returns GENTLE during MENSTRUAL phase", async () => {
+      // Set lastPeriodDate so cycle day = 2 (MENSTRUAL)
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2025-01-09"), // 1 day ago = day 2
+      });
+      currentMockDailyLog = createMockDailyLog({
+        phase: "MENSTRUAL",
+        cycleDay: 2,
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 0,
+        phaseLimit: 30,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.phase).toBe("MENSTRUAL");
+      expect(body.decision.status).toBe("GENTLE");
+    });
+
+    it("returns GENTLE during LATE_LUTEAL phase", async () => {
+      // Set lastPeriodDate so cycle day = 28 (LATE_LUTEAL)
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2024-12-14"), // 27 days ago = day 28
+      });
+      currentMockDailyLog = createMockDailyLog({
+        phase: "LATE_LUTEAL",
+        cycleDay: 28,
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 90,
+        bodyBatteryYesterdayLow: 50,
+        weekIntensityMinutes: 0,
+        phaseLimit: 50,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.phase).toBe("LATE_LUTEAL");
+      expect(body.decision.status).toBe("GENTLE");
+    });
+  });
+
+  describe("nutrition guidance", () => {
+    it("returns correct nutrition for cycle day 10 (FOLLICULAR)", async () => {
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2025-01-01"), // cycle day 10
+      });
+      currentMockDailyLog = createMockDailyLog();
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      // Day 10 is in days 7-14 range per nutrition.ts
+      expect(body.nutrition.seeds).toBe("Flax (1-2 tbsp) + Pumpkin (1-2 tbsp)");
+      expect(body.nutrition.carbRange).toBe("20-100g");
+      expect(body.nutrition.ketoGuidance).toBe(
+        "OPTIONAL - optimal keto window",
+      );
+    });
+
+    it("returns correct nutrition during luteal phase", async () => {
+      // Set to cycle day 20 (EARLY_LUTEAL)
+      currentMockUser = createMockUser({
+        lastPeriodDate: new Date("2024-12-22"), // 19 days ago = day 20
+      });
+      currentMockDailyLog = createMockDailyLog({
+        cycleDay: 20,
+        phase: "EARLY_LUTEAL",
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      // Day 20 is in days 17-24 range (sesame+sunflower)
+      expect(body.nutrition.seeds).toBe(
+        "Sesame (1-2 tbsp) + Sunflower (1-2 tbsp)",
+      );
+      expect(body.nutrition.carbRange).toBe("75-125g");
+    });
+  });
+
+  describe("biometrics data", () => {
+    it("returns biometrics from daily log when available", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = createMockDailyLog({
+        hrvStatus: "Balanced",
+        bodyBatteryCurrent: 85,
+        bodyBatteryYesterdayLow: 40,
+        weekIntensityMinutes: 45,
+        phaseLimit: 120,
+      });
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      expect(body.biometrics.hrvStatus).toBe("Balanced");
+      expect(body.biometrics.bodyBatteryCurrent).toBe(85);
+      expect(body.biometrics.bodyBatteryYesterdayLow).toBe(40);
+      expect(body.biometrics.weekIntensityMinutes).toBe(45);
+      expect(body.biometrics.phaseLimit).toBe(120);
+    });
+
+    it("returns default biometrics when no daily log exists", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = null; // No daily log
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      // Defaults when no Garmin data
+      expect(body.biometrics.hrvStatus).toBe("Unknown");
+      expect(body.biometrics.bodyBatteryCurrent).toBe(100);
+      expect(body.biometrics.bodyBatteryYesterdayLow).toBe(100);
+      expect(body.biometrics.weekIntensityMinutes).toBe(0);
+    });
+
+    it("uses TRAIN decision with default biometrics (no Garmin data)", async () => {
+      currentMockUser = createMockUser();
+      currentMockDailyLog = null;
+
+      const response = await GET(mockRequest);
+
+      expect(response.status).toBe(200);
+      const body = await response.json();
+
+      // With defaults (BB=100, HRV=Unknown), should allow training
+      // unless in restrictive phase
+      expect(body.decision.status).toBe("TRAIN");
+    });
+  });
+});
--- a/src/app/api/today/route.ts
+++ b/src/app/api/today/route.ts
@@ -2,7 +2,106 @@
 // ABOUTME: Returns complete daily snapshot with decision, biometrics, and nutrition.
 import { NextResponse } from "next/server";

-export async function GET() {
-  // TODO: Implement today's data retrieval
-  return NextResponse.json({ message: "Not implemented" }, { status: 501 });
-}
+import { withAuth } from "@/lib/auth-middleware";
+import {
+  getCycleDay,
+  getPhase,
+  getPhaseConfig,
+  getPhaseLimit,
+  PHASE_CONFIGS,
+} from "@/lib/cycle";
+import { getDecisionWithOverrides } from "@/lib/decision-engine";
+import { getNutritionGuidance } from "@/lib/nutrition";
+import { createPocketBaseClient } from "@/lib/pocketbase";
+import type { DailyData, DailyLog } from "@/types";
+
+// Default biometrics when no Garmin data is available
+const DEFAULT_BIOMETRICS = {
+  hrvStatus: "Unknown" as const,
+  bodyBatteryCurrent: 100,
+  bodyBatteryYesterdayLow: 100,
+  weekIntensityMinutes: 0,
+};
+
+export const GET = withAuth(async (_request, user) => {
+  // Validate required user data
+  if (!user.lastPeriodDate) {
+    return NextResponse.json(
+      {
+        error:
+          "User has no lastPeriodDate set. Please log your period start date first.",
+      },
+      { status: 400 },
+    );
+  }
+
+  // Calculate cycle information
+  const cycleDay = getCycleDay(
+    new Date(user.lastPeriodDate),
+    user.cycleLength,
+    new Date(),
+  );
+  const phase = getPhase(cycleDay);
+  const phaseConfig = getPhaseConfig(phase);
+  const phaseLimit = getPhaseLimit(phase);
+
+  // Calculate days until next phase
+  const currentPhaseIndex = PHASE_CONFIGS.findIndex((c) => c.name === phase);
+  const nextPhaseIndex = (currentPhaseIndex + 1) % PHASE_CONFIGS.length;
+  const nextPhaseStartDay = PHASE_CONFIGS[nextPhaseIndex].days[0];
+
+  let daysUntilNextPhase: number;
+  if (nextPhaseIndex === 0) {
+    // Currently in LATE_LUTEAL, next phase is MENSTRUAL (start of new cycle)
+    daysUntilNextPhase = user.cycleLength - cycleDay + 1;
+  } else {
+    daysUntilNextPhase = nextPhaseStartDay - cycleDay;
+  }
+
+  // Try to fetch today's DailyLog for biometrics
+  let biometrics = { ...DEFAULT_BIOMETRICS, phaseLimit };
+  try {
+    const pb = createPocketBaseClient();
+    const today = new Date().toISOString().split("T")[0];
+    const dailyLog = await pb
+      .collection("dailyLogs")
+      .getFirstListItem<DailyLog>(`user="${user.id}" && date~"${today}"`);
+
+    biometrics = {
+      hrvStatus: dailyLog.hrvStatus,
+      bodyBatteryCurrent: dailyLog.bodyBatteryCurrent,
+      bodyBatteryYesterdayLow: dailyLog.bodyBatteryYesterdayLow,
+      weekIntensityMinutes: dailyLog.weekIntensityMinutes,
+      phaseLimit: dailyLog.phaseLimit,
+    };
+  } catch {
+    // No daily log found - use defaults
+  }
+
+  // Build DailyData for decision engine
+  const dailyData: DailyData = {
+    hrvStatus: biometrics.hrvStatus,
+    bbYesterdayLow: biometrics.bodyBatteryYesterdayLow,
+    phase,
+    weekIntensity: biometrics.weekIntensityMinutes,
+    phaseLimit: biometrics.phaseLimit,
+    bbCurrent: biometrics.bodyBatteryCurrent,
+  };
+
+  // Get training decision with override handling
+  const decision = getDecisionWithOverrides(dailyData, user.activeOverrides);
+
+  // Get nutrition guidance
+  const nutrition = getNutritionGuidance(cycleDay);
+
+  return NextResponse.json({
+    decision,
+    cycleDay,
+    phase,
+    phaseConfig,
+    daysUntilNextPhase,
+    cycleLength: user.cycleLength,
+    biometrics,
+    nutrition,
+  });
+});