(function () {
  'use strict';

  const HF_SPACE = 'wss://zeetay-anomaly-detection.hf.space';
  const useSameHost = location.hostname.endsWith('.hf.space') || location.hostname === 'localhost' || location.hostname === '127.0.0.1';
  const WS_URL = (useSameHost ? (location.protocol === 'https:' ? 'wss:' : 'ws:') + '//' + location.host : HF_SPACE) + '/ws';
  const MAX_POINTS = 200;
  const THRESHOLD = 0.60;

  // DOM refs
  const statusEl       = document.getElementById('status');
  const phaseBadgeEl   = document.getElementById('phase-badge');
  const phaseDescEl    = document.getElementById('phase-desc');
  const obsCountEl     = document.getElementById('obs-count');
  const totalObsEl     = document.getElementById('total-obs');
  const totalAnomaliesEl = document.getElementById('total-anomalies');
  const totalDriftEl   = document.getElementById('total-drift');
  const precisionEl    = document.getElementById('precision');
  const recallEl       = document.getElementById('recall');
  const f1El           = document.getElementById('f1');

  // Rolling buffer of the last MAX_POINTS messages
  const buffer = [];

  // ── helpers ─────────────────────────────────────────────────────────────────

  function setConnected(ok) {
    statusEl.textContent = ok ? 'Connected' : 'Disconnected';
    statusEl.className   = ok ? 'connected'  : 'disconnected';
  }

  function updatePhase(phase) {
    const labels = { A: 'Phase A', B: 'Phase B', C: 'Phase C' };
    const descs  = { A: 'building baseline', B: 'sensors drifting', C: 'anomalies active' };
    phaseBadgeEl.textContent = labels[phase] || phase;
    phaseBadgeEl.className   = 'phase-badge phase-' + phase;
    if (phaseDescEl) phaseDescEl.textContent = descs[phase] || '';
  }

  function updateCounters(msg) {
    if (msg.total_anomalies_detected != null) totalAnomaliesEl.textContent = msg.total_anomalies_detected;
    if (msg.total_drift_events != null)       totalDriftEl.textContent     = msg.total_drift_events;
    const obs = (msg.observation_index != null) ? msg.observation_index + 1 : 0;
    totalObsEl.textContent  = obs;
    obsCountEl.textContent  = obs + ' observations';
    precisionEl.textContent = (msg.running_precision ?? 0).toFixed(2);
    recallEl.textContent    = (msg.running_recall    ?? 0).toFixed(2);
    f1El.textContent        = (msg.running_f1        ?? 0).toFixed(2);
    if (msg.phase) updatePhase(msg.phase);
  }

  // ── shared drift-line plugin ─────────────────────────────────────────────────

  function makeDriftPlugin() {
    return {
      id: 'driftLines',
      afterDraw: function (chart) {
        if (!chart.chartArea) return;
        var driftPts = buffer.filter(function (p) { return p.drift_event; });
        if (!driftPts.length) return;
        var xScale = chart.scales && chart.scales.x;
        if (!xScale) return;
        var ctx = chart.ctx;
        var area = chart.chartArea;
        ctx.save();
        ctx.setLineDash([4, 4]);
        ctx.strokeStyle = '#eab308';
        ctx.lineWidth   = 1.5;
        driftPts.forEach(function (p) {
          var x = xScale.getPixelForValue(p.index);
          if (x >= area.left && x <= area.right) {
            ctx.beginPath();
            ctx.moveTo(x, area.top);
            ctx.lineTo(x, area.bottom);
            ctx.stroke();
          }
        });
        ctx.restore();
      }
    };
  }

  // ── sensor chart ─────────────────────────────────────────────────────────────

  var sensorChart = new Chart(document.getElementById('chart-sensors').getContext('2d'), {
    type: 'line',
    data: {
      labels: [],
      datasets: [
        { label: 'Temperature', data: [], borderColor: '#38bdf8', backgroundColor: 'transparent', fill: false, tension: 0.15, pointRadius: 0, borderWidth: 2 },
        { label: 'Pressure',    data: [], borderColor: '#a78bfa', backgroundColor: 'transparent', fill: false, tension: 0.15, pointRadius: 0, borderWidth: 2 },
        { label: 'Vibration',   data: [], borderColor: '#34d399', backgroundColor: 'transparent', fill: false, tension: 0.15, pointRadius: 0, borderWidth: 2 }
      ]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      interaction: { intersect: false, mode: 'index' },
      animation: false,
      scales: {
        x: {
          display: true,
          title: { display: true, text: 'Observation index', color: '#a1a1aa', font: { family: "'DM Sans', system-ui", size: 11 } },
          grid:   { color: 'rgba(255,255,255,0.05)' },
          ticks:  { color: '#71717a', maxTicksLimit: 12 }
        },
        y: {
          display: true,
          grid:  { color: 'rgba(255,255,255,0.05)' },
          ticks: { color: '#71717a' }
        }
      },
      plugins: {
        legend: {
          display: false
        },
        tooltip: {
          callbacks: {
            afterBody: function (items) {
              var idx = items[0] && items[0].dataIndex;
              var p   = buffer[idx];
              if (!p) return '';
              var lines = [];
              if (p.alert) lines.push('Alert: YES');
              if (p.label && p.label !== 'normal') lines.push('Ground truth: ' + p.label.replace('_', ' '));
              return lines;
            }
          }
        }
      }
    },
    plugins: [makeDriftPlugin()]
  });

  // ── anomaly score chart ───────────────────────────────────────────────────────

  var thresholdPlugin = {
    id: 'thresholdLine',
    afterDraw: function (chart) {
      if (!chart.chartArea) return;
      var yScale = chart.scales && chart.scales.y;
      if (!yScale) return;
      var y = yScale.getPixelForValue(THRESHOLD);
      var ctx = chart.ctx;
      var area = chart.chartArea;
      ctx.save();
      ctx.setLineDash([6, 3]);
      ctx.strokeStyle = '#ef4444';
      ctx.lineWidth   = 1.5;
      ctx.beginPath();
      ctx.moveTo(area.left,  y);
      ctx.lineTo(area.right, y);
      ctx.stroke();
      ctx.restore();
    }
  };

  var scoreChart = new Chart(document.getElementById('chart-score').getContext('2d'), {
    type: 'line',
    data: {
      labels: [],
      datasets: [
        {
          label: 'Anomaly score',
          data: [],
          borderColor: '#6366f1',
          backgroundColor: 'rgba(99,102,241,0.08)',
          fill: true,
          tension: 0.2,
          pointRadius: 0,
          borderWidth: 1.5
        }
      ]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      interaction: { intersect: false, mode: 'index' },
      animation: false,
      scales: {
        x: {
          display: true,
          grid:  { color: 'rgba(255,255,255,0.05)' },
          ticks: { color: '#71717a', maxTicksLimit: 12 }
        },
        y: {
          display: true,
          min: 0,
          max: 1,
          grid:  { color: 'rgba(255,255,255,0.05)' },
          ticks: { color: '#71717a', stepSize: 0.25 }
        }
      },
      plugins: {
        legend: { display: false }
      }
    },
    plugins: [makeDriftPlugin(), thresholdPlugin]
  });

  // ── buffer + redraw ───────────────────────────────────────────────────────────

  function pushPoint(msg) {
    buffer.push({
      index:         msg.observation_index,
      temperature:   msg.temperature,
      pressure:      msg.pressure,
      vibration:     msg.vibration,
      anomaly_score: msg.anomaly_score,
      alert:         msg.alert,
      drift_event:   msg.drift_event,
      label:         msg.label,
      phase:         msg.phase
    });
    if (buffer.length > MAX_POINTS) buffer.shift();
  }

  function redrawCharts() {
    if (!buffer.length) return;

    var labels  = buffer.map(function (p) { return p.index; });
    var tempData    = buffer.map(function (p) { return p.temperature; });
    var pressData   = buffer.map(function (p) { return p.pressure; });
    var vibeData    = buffer.map(function (p) { return p.vibration; });
    var scoreData   = buffer.map(function (p) { return p.anomaly_score; });

    var alertRadius = buffer.map(function (p) { return p.alert ? 5 : 0; });
    var alertColor  = buffer.map(function (p) { return p.alert ? '#ef4444' : 'transparent'; });

    // Sensor chart
    sensorChart.data.labels = labels;
    sensorChart.data.datasets[0].data = tempData;
    sensorChart.data.datasets[1].data = pressData;
    sensorChart.data.datasets[2].data = vibeData;
    [0, 1, 2].forEach(function (i) {
      sensorChart.data.datasets[i].pointRadius          = alertRadius;
      sensorChart.data.datasets[i].pointBackgroundColor = alertColor;
      sensorChart.data.datasets[i].pointBorderColor     = alertColor;
    });
    sensorChart.update('none');

    // Score chart
    scoreChart.data.labels = labels;
    scoreChart.data.datasets[0].data          = scoreData;
    scoreChart.data.datasets[0].pointRadius   = alertRadius;
    scoreChart.data.datasets[0].pointBackgroundColor = alertColor;
    scoreChart.update('none');
  }

  // ── WebSocket ─────────────────────────────────────────────────────────────────

  function connect() {
    var ws = new WebSocket(WS_URL);

    ws.onopen  = function () { setConnected(true); };
    ws.onclose = function () { setConnected(false); setTimeout(connect, 2000); };
    ws.onerror = function () { setConnected(false); };

    ws.onmessage = function (ev) {
      try {
        var msg = JSON.parse(ev.data);
        updateCounters(msg);
        pushPoint(msg);
        redrawCharts();
      } catch (e) { /* ignore parse errors */ }
    };
  }

  // ── accordion ────────────────────────────────────────────────────────────────

  (function () {
    var section = document.getElementById('explainer');
    var toggle  = document.getElementById('explainer-toggle');
    if (section && toggle) {
      toggle.addEventListener('click', function () { section.classList.toggle('open'); });
    }
  })();

  connect();
})();