{# _ticket_inventory.html -- Ticket Inventory horizontal stacked bars component #}
{# Usage: {% include "django_program/manage/charts/_ticket_inventory.html" with chart_data=chart_tickets_json %} #}

<div class="card card--static">
  <div style="padding: 1.25rem 1.5rem 0.75rem; border-bottom: 1px solid var(--color-border-light);">
    <div style="font-weight: 700; font-size: 0.95rem; color: var(--color-text);">Ticket Inventory</div>
    <div style="font-size: 0.78rem; color: var(--color-text-muted); margin-top: 0.1rem;">Sold, reserved, and remaining by type</div>
  </div>
  <div style="padding: 1rem 1.5rem 1.25rem;">
    <canvas id="chart-ticket-inventory" style="width: 100%; height: 240px; display: block;"></canvas>
  </div>
</div>

<script>
(function() {
  var canvas = document.getElementById('chart-ticket-inventory');
  if (!canvas) return;
  var u = window._chartUtils;
  if (!u) return;
  var data = JSON.parse('{{ chart_data|escapejs }}');

  function drawTicketChart() {
    var s = u.setupCanvas(canvas);
    var ctx = s.ctx, w = s.w, h = s.h;
    if (!data || !data.length) { u.drawEmpty(ctx, w, h, 'No ticket types configured'); return; }

    var padL = 10, padR = 16, padT = 10, padB = 10;
    var labelW = 120;
    var maxItems = Math.min(data.length, 8);
    var rowH = Math.min(36, (h - padT - padB) / maxItems);
    var barAreaW = w - padL - labelW - padR;
    var maxTotal = Math.max.apply(null, data.map(function(d) { return d.total || (d.sold + d.reserved + d.remaining); })) || 1;

    var rowRects = [];

    function draw(t) {
      var progress = u.easeOutCubic(t);
      ctx.clearRect(0, 0, w, h);

      for (var i = 0; i < maxItems; i++) {
        var d = data[i];
        var rowY = padT + i * rowH;
        var barY = rowY + 6;
        var barH = rowH - 14;
        var totalVal = d.total || (d.sold + d.reserved + d.remaining);
        if (totalVal === 0) totalVal = 1;

        ctx.save();
        ctx.fillStyle = u.COLORS.text;
        ctx.font = '600 11px -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif';
        ctx.textAlign = 'right';
        ctx.textBaseline = 'middle';
        var label = d.name.length > 16 ? d.name.substring(0, 15) + '\u2026' : d.name;
        ctx.fillText(label, padL + labelW - 10, barY + barH / 2);
        ctx.restore();

        var barX = padL + labelW;

        ctx.fillStyle = '#f0f1f4';
        u.roundRect(ctx, barX, barY, barAreaW, barH, 4);
        ctx.fill();

        var soldW = (d.sold / totalVal) * barAreaW * progress;
        if (soldW > 0) {
          var soldGrad = ctx.createLinearGradient(barX, 0, barX + soldW, 0);
          soldGrad.addColorStop(0, u.COLORS.indigo);
          soldGrad.addColorStop(1, u.COLORS.indigoLight);
          ctx.fillStyle = soldGrad;
          u.roundRect(ctx, barX, barY, soldW, barH, soldW >= barAreaW - 1 ? 4 : [4, 0, 0, 4]);
          ctx.fill();
        }

        var resW = (d.reserved / totalVal) * barAreaW * progress;
        if (resW > 1) {
          ctx.fillStyle = u.COLORS.amber;
          ctx.fillRect(barX + soldW, barY, resW, barH);
        }

        if (progress > 0.8) {
          ctx.save();
          ctx.font = '700 9px "SF Mono", SFMono-Regular, Menlo, Consolas, monospace';
          ctx.textBaseline = 'middle';
          var midY = barY + barH / 2;
          if (soldW > 30) {
            ctx.fillStyle = '#fff';
            ctx.textAlign = 'center';
            ctx.fillText(d.sold, barX + soldW / 2, midY);
          }
          ctx.fillStyle = u.COLORS.textMuted;
          ctx.textAlign = 'left';
          var remainLabel = d.remaining > 0 ? d.remaining + ' left' : (d.total === 0 ? '\u221e' : '0 left');
          ctx.fillText(remainLabel, barX + barAreaW + 6, midY);
          ctx.restore();
        }

        rowRects.push({ y: rowY, h: rowH, idx: i });
      }

      if (maxItems * rowH + 30 < h) {
        var legY = padT + maxItems * rowH + 8;
        var legItems = [
          { color: u.COLORS.indigo, label: 'Sold' },
          { color: u.COLORS.amber, label: 'Reserved' },
          { color: '#f0f1f4', label: 'Remaining' }
        ];
        var legX = padL + labelW;
        ctx.save();
        for (var li = 0; li < legItems.length; li++) {
          ctx.fillStyle = legItems[li].color;
          ctx.fillRect(legX, legY, 10, 10);
          ctx.fillStyle = u.COLORS.textMuted;
          ctx.font = '500 10px -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif';
          ctx.textAlign = 'left';
          ctx.textBaseline = 'middle';
          ctx.fillText(legItems[li].label, legX + 14, legY + 5);
          legX += ctx.measureText(legItems[li].label).width + 28;
        }
        ctx.restore();
      }
    }

    u.animate(700, draw, function() {
      canvas.addEventListener('mousemove', function(e) {
        var rect = canvas.getBoundingClientRect();
        var my = e.clientY - rect.top;
        var hit = null;
        for (var i = 0; i < rowRects.length; i++) {
          if (my >= rowRects[i].y && my < rowRects[i].y + rowRects[i].h) {
            hit = data[rowRects[i].idx]; break;
          }
        }
        if (hit) {
          canvas.style.cursor = 'pointer';
          var totalLabel = hit.total > 0 ? u.formatNumber(hit.total) : 'Unlimited';
          u.showTooltip(e,
            '<div style="font-weight:700;margin-bottom:2px;">' + hit.name + '</div>' +
            '<div>Sold: <strong>' + u.formatNumber(hit.sold) + '</strong></div>' +
            '<div>Reserved: <strong>' + u.formatNumber(hit.reserved) + '</strong></div>' +
            '<div>Remaining: <strong>' + u.formatNumber(hit.remaining) + '</strong></div>' +
            '<div style="border-top:1px solid rgba(255,255,255,0.2);margin-top:3px;padding-top:3px;">Capacity: ' + totalLabel + '</div>'
          );
        } else {
          canvas.style.cursor = 'default';
          u.hideTooltip();
        }
      });
      canvas.addEventListener('mouseleave', function() { u.hideTooltip(); canvas.style.cursor = 'default'; });
    });
  }

  requestAnimationFrame(drawTicketChart);
  window.addEventListener('resize', (function() {
    var timer;
    return function() { clearTimeout(timer); timer = setTimeout(drawTicketChart, 200); };
  })());
})();
</script>