nutrition-mcp/scripts/health-sync.js

// Health Sync — reads Apple Health via Scripting app and POSTs to health-mcp server
// Run via Scripting app automation at 9:30am daily
// Server: http://chronos:9432/ingest
//
// Uses Scripting app APIs:
//   Health.queryQuantitySamples(type, options) — returns samples
//   sample.quantityValue(unit) — extracts numeric value
//   HealthUnit / HealthMetricPrefix — unit construction
//   fetch() — standard Fetch API (with allowInsecureRequest for HTTP)
//   Notification.schedule({ title, body }) — static method
//
// Docs: https://scriptingapp.github.io/guide/Device%20Capabilities/Health/

// Variables used by Scripting app. These must be at the very top of the file.
// icon-color: deep-blue; icon-glyph: heart;

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

// --- Units for each quantity type ---
// HealthUnit API: https://scriptingapp.github.io/guide/Device%20Capabilities/Health/HealthUnit
const U = {
  kg: HealthUnit.gramUnit(HealthMetricPrefix.kilo),
  mmHg: HealthUnit.fromString("mmHg"),
  bpm: HealthUnit.count().divided(HealthUnit.minute()),
  count: HealthUnit.count(),
  percent: HealthUnit.percent()
};

// Read the most recent sample of a type. Returns { value, startDate } or null.
async function readLatest(type, unit) {
  try {
    const samples = await Health.queryQuantitySamples(type, {
      limit: 1,
      sortDescriptors: [{ key: "startDate", order: "reverse" }]
    });
    if (!samples || samples.length === 0) {
      console.log(`readLatest(${type}): no samples`);
      return null;
    }
    const s = samples[0];
    const value = s.quantityValue(unit);
    console.log(`readLatest(${type}): value=${value} date=${s.startDate}`);
    return { value, startDate: s.startDate };
  } catch (e) {
    console.log(`readLatest(${type}): error ${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 samples = await Health.queryQuantitySamples(type, {
      startDate: start,
      endDate: new Date()
    });
    if (!samples || samples.length === 0) {
      console.log(`readTodaySum(${type}): no samples`);
      return null;
    }
    let total = 0;
    for (const s of samples) {
      total += s.quantityValue(unit);
    }
    console.log(`readTodaySum(${type}): total=${total}`);
    return total;
  } catch (e) {
    console.log(`readTodaySum(${type}): error ${e}`);
    return null;
  }
}

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

async function notify(body) {
  console.log(`notify: ${body}`);
  await Notification.schedule({
    title: "Health Sync",
    body: body
  });
}

// --- Read all health metrics ---
console.log("=== Health Sync starting ===");

const weight = await readLatest("bodyMass", U.kg);
const bpSys = await readLatest("bloodPressureSystolic", U.mmHg);
const bpDia = await readLatest("bloodPressureDiastolic", U.mmHg);
const hr = await readLatest("heartRate", U.bpm);
const restingHr = await readLatest("restingHeartRate", U.bpm);
const steps = await readTodaySum("stepCount", U.count);
const spo2 = await readLatest("oxygenSaturation", U.percent);

console.log(`Results: weight=${weight?.value} bpSys=${bpSys?.value} bpDia=${bpDia?.value} hr=${hr?.value} rhr=${restingHr?.value} steps=${steps} spo2=${spo2?.value}`);

// --- 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"
  });
}

console.log(`Total samples to send: ${samples.length}`);

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

  try {
    const response = await fetch(SERVER_URL, {
      method: "POST",
      headers: {
        "Authorization": `Bearer ${API_KEY}`,
        "Content-Type": "application/json"
      },
      body: JSON.stringify({ samples: samples }),
      allowInsecureRequest: true
    });
    const res = await response.json();
    console.log(`Server response: ${JSON.stringify(res)}`);
    await notify(`Sent ${res.ingested || samples.length} samples`);
  } catch (e) {
    console.log(`POST error: ${e}`);
    await notify(`Error: ${e.message || e}`);
  }

} // end else
console.log("=== Health Sync done ===");