nutrition-mcp/scripts/health-sync.js

// Health Sync — reads Apple Health and POSTs to nutrition-mcp server
// Run via Scriptable automation at 9:30am daily
// Server: http://chronos:9432/ingest
//
// Uses Scriptable's Health API: new Health() instance with string units.

const SERVER_URL = "http://chronos:9432/ingest";
const API_KEY = "333f09ce904e9cbbe3b578fda393be92869122c7222dbccd";

// Read the most recent sample of a type. Returns { value, startDate } or null.
async function readLatest(type, unit) {
  try {
    const h = new Health();
    h.setTypeIdentifier(type);
    h.setUnit(unit);
    h.setLimit(1);
    h.setDescendingSorting();
    const samples = await h.quantitySamples();
    if (!samples || samples.length === 0) return null;
    const s = samples[0];
    return { value: s.value, startDate: new Date(s.startDate) };
  } catch (e) {
    return null;
  }
}

// Sum all samples of a type since midnight. Returns a number or null.
async function readTodaySum(type, unit) {
  try {
    const start = new Date();
    start.setHours(0, 0, 0, 0);
    const h = new Health();
    h.setTypeIdentifier(type);
    h.setUnit(unit);
    const samples = await h.quantitySamples();
    if (!samples || samples.length === 0) return null;
    let total = 0;
    for (const s of samples) {
      const sd = new Date(s.startDate);
      if (sd >= start) total += s.value;
    }
    return total;
  } catch (e) {
    return null;
  }
}

function todayDate() {
  return new Date().toISOString().slice(0, 10);
}

function notify(body) {
  const n = new Notification();
  n.title = "Health Sync";
  n.body = body;
  n.schedule();
}

// --- Read all health metrics ---
const weight = await readLatest("bodyMass", "kg");
const bpSys = await readLatest("bloodPressureSystolic", "mmHg");
const bpDia = await readLatest("bloodPressureDiastolic", "mmHg");
const hr = await readLatest("heartRate", "count/min");
const restingHr = await readLatest("restingHeartRate", "count/min");
const steps = await readTodaySum("stepCount", "count");
const spo2 = await readLatest("oxygenSaturation", "%");

// --- Build samples array — only include metrics that have data ---
const samples = [];

if (weight) {
  samples.push({
    type: "weight",
    timestamp_utc: weight.startDate.toISOString(),
    value: weight.value,
    source: "apple_health"
  });
}

if (bpSys && bpDia) {
  const bpValue = { systolic: bpSys.value, diastolic: bpDia.value };
  if (hr) bpValue.pulse = hr.value;
  samples.push({
    type: "blood_pressure",
    timestamp_utc: bpSys.startDate.toISOString(),
    value: bpValue,
    source: "omron"
  });
}

if (hr && !bpSys) {
  samples.push({
    type: "heart_rate",
    timestamp_utc: hr.startDate.toISOString(),
    value: hr.value,
    source: "apple_health"
  });
}

if (restingHr) {
  samples.push({
    type: "resting_heart_rate",
    timestamp_utc: restingHr.startDate.toISOString(),
    value: restingHr.value,
    source: "apple_health"
  });
}

if (steps !== null) {
  samples.push({
    type: "steps",
    timestamp_utc: todayDate(),
    value: steps,
    source: "apple_health"
  });
}

if (spo2) {
  samples.push({
    type: "spo2",
    timestamp_utc: spo2.startDate.toISOString(),
    value: spo2.value * 100, // HealthKit stores 0-1, server expects %
    source: "apple_health"
  });
}

// --- POST to server ---
if (samples.length === 0) {
  await notify("No health data found today");
} else {

const req = new Request(SERVER_URL);
req.method = "POST";
req.headers = {
  "Authorization": `Bearer ${API_KEY}`,
  "Content-Type": "application/json"
};
req.body = JSON.stringify({ samples: samples });

try {
  const res = await req.loadJSON();
  await notify(`✓ Sent ${res.ingested || samples.length} samples`);
} catch (e) {
  await notify(`✗ Error: ${e.message || e}`);
}

} // end else