(function () {
  const app = document.querySelector('[data-bc-home]');
  if (!app) return;

  const chartShell = app.querySelector('[data-bc-chart]');
  const instrumentSelect = app.querySelector('[data-bc-instrument]');
  const instrumentNameNode = app.querySelector('[data-bc-instrument-name]');
  const instrumentMetaNode = app.querySelector('[data-bc-instrument-meta]');
  const rangeButtons = Array.from(app.querySelectorAll('[data-range]'));
  const statusNode = app.querySelector('[data-bc-chart-status]');
  const summaryNode = app.querySelector('[data-bc-chart-summary]');
  const endpoint = app.getAttribute('data-chart-endpoint') || '';
  const instrumentsScript = app.querySelector('[data-bc-instruments-json]');
  const instrumentMap = new Map();
  if (instrumentsScript?.textContent) {
    try {
      const items = JSON.parse(instrumentsScript.textContent);
      if (Array.isArray(items)) {
        items.forEach((item) => instrumentMap.set(String(item.instrument_id), item));
      }
    } catch (_error) {}
  }
  let activeRange = '1m';
  let currentPayload = null;

  function pointsForRange(payload, range) {
    if (!payload) return [];
    const daily = payload.daily || [];
    const weekly = payload.weekly || [];
    const monthly = payload.monthly || [];
    switch (range) {
      case '1d': return daily.slice(-2);
      case '5d': return daily.slice(-5);
      case '1m': return daily.slice(-22);
      case '3m': return daily.slice(-66);
      case '6m': return weekly.slice(-26);
      case '1y': return weekly.slice(-52);
      case '5y': return monthly.slice(-60);
      default: return daily.slice(-22);
    }
  }

  function renderChart(points) {
    if (!chartShell) return;
    chartShell.classList.remove('bc-panel-fade');
    void chartShell.offsetWidth;
    chartShell.classList.add('bc-panel-fade');

    if (!points || points.length === 0) {
      chartShell.innerHTML = '<div class="muted">Keine Chartdaten verfuegbar.</div>';
      return;
    }

    const values = points.map((point) => Number(point.close || 0));
    const min = Math.min(...values);
    const max = Math.max(...values);
    const width = 920;
    const height = 340;
    const paddingX = 24;
    const paddingY = 28;
    const usableWidth = width - paddingX * 2;
    const usableHeight = height - paddingY * 2;
    const spread = max - min || 1;

    const coords = points.map((point, index) => {
      const x = paddingX + (usableWidth * index / Math.max(points.length - 1, 1));
      const y = paddingY + usableHeight - ((Number(point.close || 0) - min) / spread) * usableHeight;
      return { x, y };
    });

    const path = coords.map((coord, index) => `${index === 0 ? 'M' : 'L'}${coord.x.toFixed(2)},${coord.y.toFixed(2)}`).join(' ');
    const area = `${path} L${coords[coords.length - 1].x.toFixed(2)},${height - paddingY} L${coords[0].x.toFixed(2)},${height - paddingY} Z`;
    const grid = [0, 1, 2, 3].map((step) => {
      const y = paddingY + (usableHeight * step / 3);
      return `<line x1="${paddingX}" y1="${y}" x2="${width - paddingX}" y2="${y}"></line>`;
    }).join('');

    chartShell.innerHTML = `
      <svg class="bc-chart-svg" viewBox="0 0 ${width} ${height}" preserveAspectRatio="none">
        <defs>
          <linearGradient id="bc-chart-fill" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="rgba(94,234,212,0.32)"></stop>
            <stop offset="100%" stop-color="rgba(94,234,212,0.02)"></stop>
          </linearGradient>
        </defs>
        <g class="bc-chart-grid">${grid}</g>
        <path class="bc-chart-area" d="${area}"></path>
        <path class="bc-chart-path" d="${path}"></path>
      </svg>
    `;

    const first = values[0];
    const last = values[values.length - 1];
    const delta = last - first;
    const percent = first !== 0 ? (delta / first) * 100 : 0;
    if (summaryNode) {
      summaryNode.textContent = `${last.toFixed(2)} | ${delta >= 0 ? '+' : ''}${delta.toFixed(2)} (${percent.toFixed(2)}%)`;
    }
  }

  async function loadChart() {
    const instrumentId = instrumentSelect ? instrumentSelect.value : '';
    if (!instrumentId || !endpoint) {
      if (statusNode) statusNode.textContent = 'Keine Aktie fuer den Chart ausgewaehlt.';
      if (summaryNode) summaryNode.textContent = '-';
      if (chartShell) chartShell.innerHTML = '<div class="muted">Keine Chartdaten verfuegbar.</div>';
      return;
    }
    if (statusNode) statusNode.textContent = 'Chartdaten werden geladen...';
    try {
      const response = await fetch(`${endpoint}${endpoint.includes('?') ? '&' : '?'}instrument_id=${encodeURIComponent(instrumentId)}`, { headers: { Accept: 'application/json' } });
      const payload = await response.json();
      if (!payload.ok) {
        throw new Error(payload.message || 'Chartdaten konnten nicht geladen werden.');
      }
      currentPayload = payload;
      renderChart(pointsForRange(payload, activeRange));
      if (statusNode) statusNode.textContent = `Quelle: Bavest | ISIN ${payload.isin || ''}`;
    } catch (error) {
      currentPayload = null;
      chartShell.innerHTML = `<div class="muted">${error.message}</div>`;
      if (statusNode) statusNode.textContent = 'Fehler beim Laden der Chartdaten.';
    }
  }

  rangeButtons.forEach((button) => {
    button.addEventListener('click', () => {
      activeRange = button.getAttribute('data-range') || '1m';
      rangeButtons.forEach((item) => item.setAttribute('aria-pressed', item === button ? 'true' : 'false'));
      renderChart(pointsForRange(currentPayload, activeRange));
    });
  });

  if (instrumentSelect) {
    instrumentSelect.addEventListener('change', () => {
      const meta = instrumentMap.get(String(instrumentSelect.value));
      if (meta) {
        if (instrumentNameNode) instrumentNameNode.textContent = meta.instrument_name || 'Keine Aktie ausgewaehlt';
        if (instrumentMetaNode) instrumentMetaNode.textContent = `${meta.symbol || ''} · ${meta.isin || '-'}`;
      }
      loadChart();
    });
  }

  loadChart();
})();