heart-rate-fetcher.js

export default {
  async scheduled(event, env) {
    const now   = new Date();
    const since = new Date(now.getTime() - 24 * 60 * 60 * 1000);
    const url   = new URL("https://api.ouraring.com/v2/usercollection/heartrate");
    url.searchParams.set("start_datetime", since.toISOString());
    url.searchParams.set("end_datetime",   now.toISOString());

    const resp = await fetch(url, {
      headers: {
        "Authorization": `Bearer ${env.OURA_TOKEN}`,
        "Accept":        "application/json"
      }
    });
    if (!resp.ok) {
      console.error("Oura API error", resp.status);
      return;
    }

    const { data } = await resp.json();
    if (!data?.length) {
      console.log("⏸ no new data, keeping previous history");
      return;
    }

    await env.heart_rate.put("history", JSON.stringify(data));
    const latest = data[data.length - 1];
    await env.heart_rate.put("latest", JSON.stringify(latest));
  },

  async fetch(request, env) {
    const url = new URL(request.url);
    if (url.pathname === "/latest") {
      const raw = await env.heart_rate.get("latest");
      return raw
        ? new Response(raw,    { headers: { "Content-Type": "application/json" } })
        : new Response("No data yet", { status: 404 });
    }

    if (url.pathname === "/history") {
      const raw = await env.heart_rate.get("history");
      return raw
        ? new Response(raw,    { headers: { "Content-Type": "application/json" } })
        : new Response("No history yet", { status: 404 });
    }

    return new Response("Not found", { status: 404 });
  }
};