let chartXY = null, chartZ = null;

function initCharts() {
  const base = {
    responsive: true, maintainAspectRatio: false,
    plugins: { legend: { labels: { color: '#888' } }, title: { display: true, color: '#ccc' } },
    scales: {
      x: { ticks: { color: '#666' }, grid: { color: '#1a2a1a' } },
      y: { ticks: { color: '#666' }, grid: { color: '#1a2a1a' } }
    }
  };
  chartXY = new Chart(document.getElementById('chart-xy'), {
    type: 'scatter',
    data: { datasets: [{ label: 'Track XY (m)', data: [], borderColor: '#4ade80',
                         backgroundColor: 'rgba(74,222,128,0.3)', pointRadius: 1 }] },
    options: { ...base, plugins: { ...base.plugins,
      title: { display: true, text: 'Track XY lingbot (m, local)', color: '#ccc' } } }
  });
  chartZ = new Chart(document.getElementById('chart-z'), {
    type: 'line',
    data: { datasets: [{ label: 'Z camera (m)', data: [], borderColor: '#60a5fa',
                         backgroundColor: 'transparent', pointRadius: 0, borderWidth: 1.5 }] },
    options: { ...base,
      plugins: { ...base.plugins,
        title: { display: true, text: 'Z camera / profondeur approx (m)', color: '#ccc' } },
      scales: { ...base.scales, y: { ...base.scales.y, reverse: true } } }
  });
}

async function loadJobs() {
  const res = await fetch('/api/jobs');
  const jobs = await res.json();
  const sel = document.getElementById('job-select');
  jobs.forEach(j => {
    const opt = document.createElement('option');
    opt.value = j.id;
    opt.textContent = 'job_' + j.id;
    sel.appendChild(opt);
  });
  const urlJob = new URLSearchParams(window.location.search).get('job');
  const target = urlJob ? parseInt(urlJob) : (jobs.length > 0 ? jobs[0].id : null);
  if (target) { sel.value = target; loadJob(target); }
}

async function loadJob(jobId) {
  const res = await fetch('/api/job/' + jobId + '/nav');
  const d = await res.json();
  if (!d.track) return;
  chartXY.data.datasets[0].data = d.track.x.map((x,i) => ({ x, y: d.track.y[i] }));
  chartXY.update();
  chartZ.data.datasets[0].data = d.track.z.map((z,i) => ({ x: i, y: z }));
  chartZ.update();
}

document.getElementById('job-select').addEventListener('change', e => {
  if (e.target.value) loadJob(parseInt(e.target.value));
});

initCharts();
loadJobs();