feat: implement Haptika PPG and Watch V1

src/features/ppg/tests/historyAnalytics.test.ts

@@ -0,0 +1,54 @@
+import {buildDailyTrends, buildFeelingCorrelation} from '../history/historyAnalytics';
+import type {StoredMeasurement} from '../storage/storageTypes';
+import {makeProcessingResult} from './syntheticMeasurements';
+
+const makeMeasurement = (
+  id: string,
+  measuredAt: string,
+  bpm: number,
+  feeling: 1 | 2 | 3 | 4 | 5,
+): StoredMeasurement => ({
+  schemaVersion: 1,
+  id,
+  measuredAt,
+  acquisition: {cameraPosition: 'front', torchUsed: false},
+  atRest: true,
+  baselineEligible: true,
+  cameraResult: (() => {
+    const result = makeProcessingResult();
+    return {...result, bpm: {...result.bpm, bpm}};
+  })(),
+  potentialStress: {
+    index: 20, confidence: 0.8, status: 'provisional', bpmContribution: 0,
+    prvContribution: 0, signalQuality: 0.9, baselineMeasurementCount: 5,
+    healthKitUsedForScore: false, limitations: [],
+  },
+  healthKitContext: null,
+  selfReport: {
+    feeling, posture: 'seated', recentExercise: false, recentCaffeine: false,
+    recentMeal: false, movementDuringMeasurement: false, phoneUnusuallyWarm: false,
+    recordedAt: measuredAt,
+  },
+});
+
+describe('history analytics', () => {
+  test('aggregates multiple measurements into chronological daily points', () => {
+    const now = Date.parse('2026-07-17T12:00:00.000Z');
+    const trends = buildDailyTrends([
+      makeMeasurement('a', '2026-07-16T08:00:00.000Z', 70, 3),
+      makeMeasurement('b', '2026-07-16T18:00:00.000Z', 80, 4),
+      makeMeasurement('c', '2026-07-17T08:00:00.000Z', 90, 4),
+    ], 30, now);
+    expect(trends.map(point => point.day)).toEqual(['2026-07-16', '2026-07-17']);
+    expect(trends[0]).toMatchObject({bpm: 75, count: 2});
+  });
+
+  test('groups descriptive BPM and RMSSD averages by feeling', () => {
+    const correlation = buildFeelingCorrelation([
+      makeMeasurement('a', '2026-07-16T08:00:00.000Z', 70, 4),
+      makeMeasurement('b', '2026-07-16T18:00:00.000Z', 80, 4),
+    ]);
+    expect(correlation).toHaveLength(1);
+    expect(correlation[0]).toMatchObject({feeling: 4, averageBpm: 75, count: 2});
+  });
+});