T019

packages/storage/package.json

@@ -10,7 +10,8 @@
     "test:ui": "vitest"
   },
   "dependencies": {
-    "ajv": "^8.17.1"
+  "ajv": "^8.17.1",
+  "ajv-formats": "^3.0.1"
   },
   "devDependencies": {
     "typescript": "^5.5.4",

packages/storage/src/compute.ts

@@ -0,0 +1,83 @@
+/**
+ * Compute helpers for GlowTrack storage (T019)
+ * - netScore: sum(positive weights) - sum(negative weights)
+ * - clamps: clamp01, clampRange
+ * - derived mapping: luminanceFromNetScore (gentle easing, 0..1)
+ * - entry CRUD helpers that recompute DayTile.netScore
+ */
+
+import type { DayTile, HabitEntry, Mood } from './models';
+
+export type HabitType = HabitEntry['type'];
+
+export function signForType(type: HabitType): 1 | -1 {
+  return type === 'positive' ? 1 : -1;
+}
+
+/**
+ * Compute netScore for a set of entries: sum(sign(type) * weight)
+ */
+export function computeNetScore(entries: HabitEntry[] | undefined | null): number {
+  if (!entries || entries.length === 0) return 0;
+  let total = 0;
+  for (const e of entries) {
+    const w = Math.max(0, Number.isFinite(e.weight) ? e.weight : 0);
+    total += signForType(e.type) * w;
+  }
+  return total;
+}
+
+/** Clamp a value to [min, max] */
+export function clampRange(x: number, min: number, max: number): number {
+  if (min > max) [min, max] = [max, min];
+  return Math.min(max, Math.max(min, x));
+}
+
+/** Clamp a value to [0,1] */
+export function clamp01(x: number): number {
+  return clampRange(x, 0, 1);
+}
+
+/**
+ * Map netScore (unbounded) to a luminance in [0,1] using a smooth S-curve.
+ * The curve centers at 0 -> 0.5 and eases toward 0/1 for large magnitudes.
+ * scale controls how quickly it saturates (higher = slower).
+ */
+export function luminanceFromNetScore(netScore: number, scale = 5): number {
+  const s = Math.max(1e-6, scale);
+  const t = Math.tanh(netScore / s); // -1..1
+  return clamp01(0.5 + 0.5 * t);
+}
+
+/** Recompute DayTile.netScore from its entries */
+export function recomputeDayNetScore(day: DayTile): number {
+  return computeNetScore(day.entries);
+}
+
+/** Replace entries on a day and recompute netScore (immutable) */
+export function replaceEntriesForDay(day: DayTile, entries: HabitEntry[]): DayTile {
+  return { ...day, entries: entries.slice(), netScore: computeNetScore(entries) };
+}
+
+/** Add an entry to a day (immutable) */
+export function addEntryToDay(day: DayTile, entry: HabitEntry): DayTile {
+  const entries = [...day.entries, entry];
+  return { ...day, entries, netScore: computeNetScore(entries) };
+}
+
+/** Update an existing entry by id (immutable; no-op if not found) */
+export function updateEntryInDay(day: DayTile, entry: HabitEntry): DayTile {
+  const entries = day.entries.map((e) => (e.id === entry.id ? entry : e));
+  return { ...day, entries, netScore: computeNetScore(entries) };
+}
+
+/** Remove an entry by id (immutable; no-op if not found) */
+export function removeEntryFromDay(day: DayTile, entryId: string): DayTile {
+  const entries = day.entries.filter((e) => e.id !== entryId);
+  return { ...day, entries, netScore: computeNetScore(entries) };
+}
+
+/** Update mood for a day (immutable) */
+export function setMoodForDay(day: DayTile, mood: Mood): DayTile {
+  return { ...day, mood };
+}

packages/storage/tests/contract/export.spec.ts

@@ -1,12 +1,10 @@
 import { describe, it, expect } from 'vitest';
 import Ajv, { type ErrorObject } from 'ajv';
+import addFormats from 'ajv-formats';
 import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 
-// Implementation placeholder import; will fail until implemented per tasks T016, T018
-// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-// @ts-expect-error - module not implemented yet
 import { exportToJson } from '../../src/export';
 
 const __filename = fileURLToPath(import.meta.url);
@@ -20,7 +18,8 @@ const schemaPath = path.join(
 describe('Contract: export JSON schema (T009)', () => {
   it('exportToJson() output should validate against export.schema.json', async () => {
     const schemaJson = JSON.parse(fs.readFileSync(schemaPath, 'utf-8'));
-    const ajv = new Ajv({ allErrors: true, strict: true });
+  const ajv = new Ajv({ allErrors: true, strict: true });
+  addFormats(ajv);
     const validate = ajv.compile(schemaJson);
 
     // Minimal call; actual implementation will read from DB/models

packages/storage/tests/unit/compute.spec.ts

@@ -0,0 +1,66 @@
+import { describe, it, expect } from 'vitest';
+import {
+  computeNetScore,
+  clamp01,
+  clampRange,
+  luminanceFromNetScore,
+  addEntryToDay,
+  updateEntryInDay,
+  removeEntryFromDay,
+  replaceEntriesForDay,
+  recomputeDayNetScore
+} from '../../src/compute';
+
+import type { DayTile, HabitEntry } from '../../src/models';
+
+function day(entries: HabitEntry[] = []): DayTile {
+  return {
+    date: '2025-01-01',
+    mood: { hue: 180, intensity: 0.5 },
+    entries,
+    netScore: computeNetScore(entries)
+  };
+}
+
+describe('compute helpers', () => {
+  it('computes netScore correctly', () => {
+    const entries: HabitEntry[] = [
+      { id: '1', type: 'positive', habitId: 'h1', label: 'A', weight: 1, timestamp: new Date().toISOString() },
+      { id: '2', type: 'positive', habitId: 'h2', label: 'B', weight: 2, timestamp: new Date().toISOString() },
+      { id: '3', type: 'negative', habitId: 'h3', label: 'C', weight: 1, timestamp: new Date().toISOString() }
+    ];
+    expect(computeNetScore(entries)).toBe(1 + 2 - 1);
+  });
+
+  it('clamps values', () => {
+    expect(clampRange(5, 0, 3)).toBe(3);
+    expect(clampRange(-2, 0, 3)).toBe(0);
+    expect(clamp01(2)).toBe(1);
+    expect(clamp01(-1)).toBe(0);
+  });
+
+  it('maps luminance smoothly', () => {
+    const lo = luminanceFromNetScore(-100);
+    const hi = luminanceFromNetScore(100);
+    const mid = luminanceFromNetScore(0);
+    expect(lo).toBeGreaterThanOrEqual(0);
+    expect(hi).toBeLessThanOrEqual(1);
+    expect(hi).toBeGreaterThan(lo);
+    expect(Math.abs(mid - 0.5)).toBeLessThan(1e-6);
+  });
+
+  it('recomputes on CRUD operations', () => {
+    let d = day();
+    d = addEntryToDay(d, { id: 'e1', type: 'positive', habitId: 'h1', label: 'A', weight: 2, timestamp: new Date().toISOString() });
+    expect(d.netScore).toBe(2);
+    d = addEntryToDay(d, { id: 'e2', type: 'negative', habitId: 'h2', label: 'B', weight: 1, timestamp: new Date().toISOString() });
+    expect(d.netScore).toBe(1);
+    d = updateEntryInDay(d, { id: 'e2', type: 'negative', habitId: 'h2', label: 'B', weight: 2, timestamp: new Date().toISOString() });
+    expect(d.netScore).toBe(0);
+    d = removeEntryFromDay(d, 'e1');
+    expect(d.netScore).toBe(-2);
+    d = replaceEntriesForDay(d, []);
+    expect(d.netScore).toBe(0);
+    expect(recomputeDayNetScore(d)).toBe(0);
+  });
+});