let flakesStarted = false;

async function loadSnow() {
  if (!navigator.geolocation) return alert('Geolocation not supported');

  navigator.geolocation.getCurrentPosition(async (pos) => {
    const lat = pos.coords.latitude;
    const lon = pos.coords.longitude;

    const res = await fetch(`/api/snowfall?lat=${lat}&lon=${lon}`);
    const data = await res.json();

    document.getElementById('amount').textContent = data.inches + ' inches today';
    document.getElementById('meta').textContent = data.location + ' • ' + data.today;

    const percent = Math.min(data.inches / data.max_inches, 1);
    document.getElementById('snowWrapper').style.height = (percent * 100) + '%';

    const now = new Date();
    document.getElementById('updated').textContent =
      'Last updated: ' + now.toLocaleTimeString();

    if (data.snowing && !flakesStarted) {
      spawnSnowflakes();
      flakesStarted = true;
    }
  });
}

function spawnSnowflakes() {
  const container = document.getElementById('snowfall');
  for (let i = 0; i < 90; i++) {
    const flake = document.createElement('div');
    flake.className = 'flake';
    flake.style.left = Math.random()*100+'vw';
    flake.style.animationDuration = 5+Math.random()*10+'s';
    flake.style.opacity = Math.random();
    flake.style.transform = `scale(${Math.random()+0.5})`;
    container.appendChild(flake);
  }
}

loadSnow();
setInterval(loadSnow, 10*60*1000);