import type { ThumbnailIcon } from "./blogThumbnails";
import { blogThumbnails } from "./blogThumbnails";

interface BlogThumbnailSVGProps {
  slug: string;
  variant?: "square" | "banner";
  className?: string;
}

// Grid pattern used in the background
const GridPattern: React.FC<{ size: number }> = ({ size }) => (
  <defs>
    <pattern id="grid" width={size} height={size} patternUnits="userSpaceOnUse">
      <path
        d={`M ${size} 0 L 0 0 0 ${size}`}
        fill="none"
        stroke="#94a3b8"
        strokeWidth="0.5"
        opacity="0.12"
      />
    </pattern>
  </defs>
);

// ─── Icon Renderers ───────────────────────────────────────────────

function renderGauge(cx: number, cy: number, accent: string) {
  const r = 52;
  // Arc from ~210° to ~330° (lower half open)
  const startAngle = (210 * Math.PI) / 180;
  const endAngle = (330 * Math.PI) / 180;
  const x1 = cx + r * Math.cos(startAngle);
  const y1 = cy + r * Math.sin(startAngle);
  const x2 = cx + r * Math.cos(endAngle);
  const y2 = cy + r * Math.sin(endAngle);
  // Needle at ~280° (pointing upper-right = fast/danger zone)
  const needleAngle = (280 * Math.PI) / 180;
  const nx = cx + (r - 14) * Math.cos(needleAngle);
  const ny = cy + (r - 14) * Math.sin(needleAngle);

  return (
    <g>
      <path
        d={`M ${x1} ${y1} A ${r} ${r} 0 1 1 ${x2} ${y2}`}
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="6"
        strokeLinecap="round"
      />
      <path
        d={`M ${x1} ${y1} A ${r} ${r} 0 1 1 ${x2} ${y2}`}
        fill="none"
        stroke={accent}
        strokeWidth="6"
        strokeLinecap="round"
        strokeDasharray="200"
        strokeDashoffset="60"
      />
      <line
        x1={cx}
        y1={cy}
        x2={nx}
        y2={ny}
        stroke="#0f172a"
        strokeWidth="3"
        strokeLinecap="round"
      />
      <circle cx={cx} cy={cy} r="5" fill="#0f172a" />
      {/* Tick marks */}
      {[210, 240, 270, 300, 330].map((deg) => {
        const rad = (deg * Math.PI) / 180;
        const tx1 = cx + (r + 6) * Math.cos(rad);
        const ty1 = cy + (r + 6) * Math.sin(rad);
        const tx2 = cx + (r + 12) * Math.cos(rad);
        const ty2 = cy + (r + 12) * Math.sin(rad);
        return (
          <line
            key={deg}
            x1={tx1}
            y1={ty1}
            x2={tx2}
            y2={ty2}
            stroke="#94a3b8"
            strokeWidth="1.5"
          />
        );
      })}
    </g>
  );
}

function renderBottleneck(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Wide top */}
      <rect
        x={cx - 50}
        y={cy - 50}
        width="100"
        height="30"
        rx="4"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Narrow middle (bottleneck) */}
      <path
        d={`M ${cx - 50} ${cy - 20} L ${cx - 12} ${cy} L ${cx - 12} ${cy + 10} L ${cx - 50} ${cy + 30} Z`}
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      <path
        d={`M ${cx + 50} ${cy - 20} L ${cx + 12} ${cy} L ${cx + 12} ${cy + 10} L ${cx + 50} ${cy + 30} Z`}
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Flow lines */}
      {[-20, 0, 20].map((offset) => (
        <circle
          key={offset}
          cx={cx + offset}
          cy={cy - 38}
          r="3"
          fill={accent}
          opacity="0.7"
        />
      ))}
      <circle cx={cx} cy={cy + 5} r="3" fill={accent} />
      {/* Wide bottom */}
      <rect
        x={cx - 50}
        y={cy + 30}
        width="100"
        height="30"
        rx="4"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Arrow down through throttle */}
      <line
        x1={cx}
        y1={cy - 30}
        x2={cx}
        y2={cy + 20}
        stroke={accent}
        strokeWidth="2"
        strokeDasharray="4 3"
      />
    </g>
  );
}

function renderPlugin(cx: number, cy: number, accent: string) {
  const s = 28;
  return (
    <g>
      {/* Connected piece 1 */}
      <rect
        x={cx - s - 8}
        y={cy - s}
        width={s}
        height={s}
        rx="4"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Connected piece 2 */}
      <rect
        x={cx - 8}
        y={cy - s}
        width={s}
        height={s}
        rx="4"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Connected piece 3 */}
      <rect
        x={cx - s - 8}
        y={cy + 4}
        width={s}
        height={s}
        rx="4"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Disconnected piece (offset) */}
      <rect
        x={cx + 6}
        y={cy + 12}
        width={s}
        height={s}
        rx="4"
        fill="none"
        stroke={accent}
        strokeWidth="2"
        strokeDasharray="4 3"
        transform={`rotate(8, ${cx + 6 + s / 2}, ${cy + 12 + s / 2})`}
      />
      {/* Connector dots */}
      <circle cx={cx - 8} cy={cy - s / 2} r="2.5" fill="#cbd5e1" />
      <circle cx={cx - 8} cy={cy + 4 + s / 2} r="2.5" fill="#cbd5e1" />
      {/* Warning */}
      <text
        x={cx + 20 + s / 2}
        y={cy + 26 + s / 2}
        fontSize="18"
        fontWeight="bold"
        fill={accent}
        textAnchor="middle"
      >
        !
      </text>
    </g>
  );
}

function renderShield(cx: number, cy: number, accent: string) {
  return (
    <g>
      <path
        d={`M ${cx} ${cy - 55} L ${cx + 45} ${cy - 30} L ${cx + 45} ${cy + 10} Q ${cx + 45} ${cy + 45} ${cx} ${cy + 55} Q ${cx - 45} ${cy + 45} ${cx - 45} ${cy + 10} L ${cx - 45} ${cy - 30} Z`}
        fill="#f8fafc"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      <path
        d={`M ${cx} ${cy - 55} L ${cx + 45} ${cy - 30} L ${cx + 45} ${cy + 10} Q ${cx + 45} ${cy + 45} ${cx} ${cy + 55} Q ${cx - 45} ${cy + 45} ${cx - 45} ${cy + 10} L ${cx - 45} ${cy - 30} Z`}
        fill="none"
        stroke={accent}
        strokeWidth="2.5"
        opacity="0.4"
      />
      {/* Checkmark */}
      <polyline
        points={`${cx - 16},${cy} ${cx - 4},${cy + 14} ${cx + 20},${cy - 14}`}
        fill="none"
        stroke={accent}
        strokeWidth="4"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
    </g>
  );
}

function renderCookie(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Cookie circle */}
      <circle
        cx={cx}
        cy={cy}
        r="48"
        fill="#fef3c7"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Chips */}
      <circle cx={cx - 14} cy={cy - 16} r="5" fill="#92400e" opacity="0.5" />
      <circle cx={cx + 18} cy={cy - 8} r="4" fill="#92400e" opacity="0.5" />
      <circle cx={cx - 6} cy={cy + 18} r="5" fill="#92400e" opacity="0.5" />
      <circle cx={cx + 12} cy={cy + 14} r="3.5" fill="#92400e" opacity="0.5" />
      {/* Strikethrough */}
      <line
        x1={cx - 38}
        y1={cx + 38}
        x2={cx + 38}
        y2={cy - 38}
        stroke={accent}
        strokeWidth="4"
        strokeLinecap="round"
      />
    </g>
  );
}

function renderCloud(cx: number, cy: number, accent: string) {
  return (
    <g>
      <path
        d={`M ${cx - 40} ${cy + 16} Q ${cx - 52} ${cy + 16} ${cx - 52} ${cy} Q ${cx - 52} ${cy - 20} ${cx - 32} ${cy - 24} Q ${cx - 28} ${cy - 48} ${cx} ${cy - 44} Q ${cx + 28} ${cy - 48} ${cx + 32} ${cy - 24} Q ${cx + 52} ${cy - 20} ${cx + 52} ${cy} Q ${cx + 52} ${cy + 16} ${cx + 40} ${cy + 16} Z`}
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Lock icon inside cloud */}
      <rect
        x={cx - 12}
        y={cy - 6}
        width="24"
        height="18"
        rx="3"
        fill="none"
        stroke={accent}
        strokeWidth="2.5"
      />
      <path
        d={`M ${cx - 6} ${cy - 6} L ${cx - 6} ${cy - 14} Q ${cx - 6} ${cy - 22} ${cx} ${cy - 22} Q ${cx + 6} ${cy - 22} ${cx + 6} ${cy - 14} L ${cx + 6} ${cy - 6}`}
        fill="none"
        stroke={accent}
        strokeWidth="2.5"
      />
      <circle cx={cx} cy={cy + 3} r="2.5" fill={accent} />
    </g>
  );
}

function renderLock(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Lock body */}
      <rect
        x={cx - 24}
        y={cy - 8}
        width="48"
        height="40"
        rx="6"
        fill="#f1f5f9"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Lock shackle */}
      <path
        d={`M ${cx - 14} ${cy - 8} L ${cx - 14} ${cy - 24} Q ${cx - 14} ${cy - 40} ${cx} ${cy - 40} Q ${cx + 14} ${cy - 40} ${cx + 14} ${cy - 24} L ${cx + 14} ${cy - 8}`}
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="3"
      />
      {/* Keyhole */}
      <circle cx={cx} cy={cy + 6} r="5" fill={accent} />
      <rect x={cx - 2} y={cy + 9} width="4" height="10" rx="1" fill={accent} />
      {/* Chain links */}
      {[-42, 42].map((offset) => (
        <g key={offset}>
          <ellipse
            cx={cx + offset}
            cy={cy + 12}
            rx="10"
            ry="6"
            fill="none"
            stroke="#cbd5e1"
            strokeWidth="1.5"
          />
          <ellipse
            cx={cx + offset + (offset > 0 ? 14 : -14)}
            cy={cy + 12}
            rx="10"
            ry="6"
            fill="none"
            stroke="#cbd5e1"
            strokeWidth="1.5"
          />
        </g>
      ))}
    </g>
  );
}

function renderChart(cx: number, cy: number, accent: string) {
  const barWidth = 14;
  const heights = [30, 50, 38, 55, 42];
  const baseY = cy + 35;
  return (
    <g>
      {/* Bars */}
      {heights.map((h, i) => (
        <rect
          key={i}
          x={cx - 48 + i * 22}
          y={baseY - h}
          width={barWidth}
          height={h}
          rx="2"
          fill={i === 3 ? accent : "#e2e8f0"}
          opacity={i === 3 ? 0.8 : 0.6}
        />
      ))}
      {/* Base line */}
      <line
        x1={cx - 55}
        y1={baseY}
        x2={cx + 60}
        y2={baseY}
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Eye with strikethrough */}
      <ellipse
        cx={cx}
        cy={cy - 30}
        rx="22"
        ry="14"
        fill="none"
        stroke={accent}
        strokeWidth="2"
      />
      <circle cx={cx} cy={cy - 30} r="6" fill={accent} opacity="0.5" />
      <line
        x1={cx - 28}
        y1={cy - 18}
        x2={cx + 28}
        y2={cy - 42}
        stroke={accent}
        strokeWidth="2.5"
        strokeLinecap="round"
      />
    </g>
  );
}

function renderLeaf(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Leaf shape */}
      <path
        d={`M ${cx} ${cy + 50} Q ${cx - 50} ${cy + 20} ${cx - 45} ${cy - 30} Q ${cx - 40} ${cy - 55} ${cx} ${cy - 50} Q ${cx + 40} ${cy - 55} ${cx + 45} ${cy - 30} Q ${cx + 50} ${cy + 20} ${cx} ${cy + 50} Z`}
        fill="none"
        stroke={accent}
        strokeWidth="2.5"
        opacity="0.7"
      />
      <path
        d={`M ${cx} ${cy + 50} Q ${cx - 50} ${cy + 20} ${cx - 45} ${cy - 30} Q ${cx - 40} ${cy - 55} ${cx} ${cy - 50} Q ${cx + 40} ${cy - 55} ${cx + 45} ${cy - 30} Q ${cx + 50} ${cy + 20} ${cx} ${cy + 50} Z`}
        fill={accent}
        opacity="0.08"
      />
      {/* Stem/vein */}
      <line
        x1={cx}
        y1={cy + 50}
        x2={cx}
        y2={cy - 40}
        stroke={accent}
        strokeWidth="1.5"
        opacity="0.5"
      />
      {/* Circuit nodes on leaf veins */}
      {[-20, 0, 20].map((offset, i) => (
        <g key={i}>
          <line
            x1={cx}
            y1={cy + offset}
            x2={cx + (i % 2 === 0 ? 20 : -20)}
            y2={cy + offset - 10}
            stroke={accent}
            strokeWidth="1"
            opacity="0.4"
          />
          <circle
            cx={cx + (i % 2 === 0 ? 20 : -20)}
            cy={cy + offset - 10}
            r="3"
            fill={accent}
            opacity="0.5"
          />
        </g>
      ))}
    </g>
  );
}

function renderPrice(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Tag shape */}
      <path
        d={`M ${cx - 30} ${cy - 40} L ${cx + 30} ${cy - 40} L ${cx + 30} ${cy + 20} L ${cx} ${cy + 45} L ${cx - 30} ${cy + 20} Z`}
        fill="#f8fafc"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Hole */}
      <circle
        cx={cx}
        cy={cy - 26}
        r="6"
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Equals sign */}
      <line
        x1={cx - 14}
        y1={cy}
        x2={cx + 14}
        y2={cy}
        stroke={accent}
        strokeWidth="3.5"
        strokeLinecap="round"
      />
      <line
        x1={cx - 14}
        y1={cy + 12}
        x2={cx + 14}
        y2={cy + 12}
        stroke={accent}
        strokeWidth="3.5"
        strokeLinecap="round"
      />
    </g>
  );
}

function renderPrototype(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Browser frame */}
      <rect
        x={cx - 48}
        y={cy - 42}
        width="96"
        height="76"
        rx="6"
        fill="#f8fafc"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Title bar */}
      <line
        x1={cx - 48}
        y1={cy - 28}
        x2={cx + 48}
        y2={cy - 28}
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Dots */}
      <circle cx={cx - 36} cy={cy - 35} r="2.5" fill="#fca5a5" />
      <circle cx={cx - 28} cy={cy - 35} r="2.5" fill="#fde68a" />
      <circle cx={cx - 20} cy={cy - 35} r="2.5" fill="#86efac" />
      {/* Wireframe lines */}
      <rect
        x={cx - 38}
        y={cy - 20}
        width="76"
        height="8"
        rx="2"
        fill="#e2e8f0"
      />
      <rect
        x={cx - 38}
        y={cy - 6}
        width="50"
        height="5"
        rx="1.5"
        fill="#e2e8f0"
      />
      <rect
        x={cx - 38}
        y={cy + 5}
        width="60"
        height="5"
        rx="1.5"
        fill="#e2e8f0"
      />
      {/* Accent wireframe block */}
      <rect
        x={cx - 38}
        y={cy + 16}
        width="32"
        height="14"
        rx="3"
        fill="none"
        stroke={accent}
        strokeWidth="1.5"
        strokeDasharray="3 2"
      />
      <rect
        x={cx + 2}
        y={cy + 16}
        width="36"
        height="14"
        rx="3"
        fill={accent}
        opacity="0.12"
        stroke={accent}
        strokeWidth="1"
      />
    </g>
  );
}

function renderGear(cx: number, cy: number, accent: string) {
  const teeth = 8;
  const innerR = 24;
  const outerR = 36;
  const toothWidth = 0.2;

  let d = "";
  for (let i = 0; i < teeth; i++) {
    const angle = (i * 2 * Math.PI) / teeth;
    const a1 = angle - toothWidth;
    const a2 = angle + toothWidth;
    const _midAngle = (a1 + a2) / 2;

    if (i === 0) {
      d += `M ${cx + outerR * Math.cos(a1)} ${cy + outerR * Math.sin(a1)} `;
    }
    d += `L ${cx + outerR * Math.cos(a2)} ${cy + outerR * Math.sin(a2)} `;

    const nextAngle = ((i + 1) * 2 * Math.PI) / teeth;
    const na1 = nextAngle - toothWidth;
    d += `L ${cx + innerR * Math.cos(a2)} ${cy + innerR * Math.sin(a2)} `;
    d += `L ${cx + innerR * Math.cos(na1)} ${cy + innerR * Math.sin(na1)} `;
    d += `L ${cx + outerR * Math.cos(na1)} ${cy + outerR * Math.sin(na1)} `;
  }
  d += "Z";

  return (
    <g>
      <path d={d} fill="#f1f5f9" stroke="#cbd5e1" strokeWidth="1.5" />
      <circle
        cx={cx}
        cy={cy}
        r="10"
        fill="white"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      {/* Infinity loop */}
      <path
        d={`M ${cx} ${cy} C ${cx - 20} ${cy - 18} ${cx - 28} ${cy + 18} ${cx} ${cy} C ${cx + 28} ${cy - 18} ${cx + 20} ${cy + 18} ${cx} ${cy}`}
        fill="none"
        stroke={accent}
        strokeWidth="2.5"
        strokeLinecap="round"
      />
    </g>
  );
}

function renderHourglass(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Top triangle */}
      <path
        d={`M ${cx - 32} ${cy - 50} L ${cx + 32} ${cy - 50} L ${cx + 4} ${cy} Z`}
        fill="#f8fafc"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      <path
        d={`M ${cx - 32} ${cy - 50} L ${cx + 32} ${cy - 50} L ${cx + 4} ${cy} Z`}
        fill={accent}
        opacity="0.08"
      />
      {/* Bottom triangle */}
      <path
        d={`M ${cx - 4} ${cy} L ${cx + 32} ${cy + 50} L ${cx - 32} ${cy + 50} Z`}
        fill="#f8fafc"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* "Sand" fill in bottom */}
      <path
        d={`M ${cx - 4} ${cy + 14} L ${cx + 18} ${cy + 50} L ${cx - 18} ${cy + 50} Z`}
        fill={accent}
        opacity="0.2"
      />
      {/* Top and bottom lines */}
      <line
        x1={cx - 38}
        y1={cy - 50}
        x2={cx + 38}
        y2={cy - 50}
        stroke="#0f172a"
        strokeWidth="2.5"
        strokeLinecap="round"
      />
      <line
        x1={cx - 38}
        y1={cy + 50}
        x2={cx + 38}
        y2={cy + 50}
        stroke="#0f172a"
        strokeWidth="2.5"
        strokeLinecap="round"
      />
      {/* Circuit nodes as "digital sand" */}
      {[10, 22, 34].map((y, i) => (
        <circle
          key={i}
          cx={cx + (i - 1) * 6}
          cy={cy + y}
          r="2"
          fill={accent}
          opacity={0.5 + i * 0.15}
        />
      ))}
    </g>
  );
}

function renderCode(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* < */}
      <polyline
        points={`${cx - 20},${cy - 24} ${cx - 46},${cy} ${cx - 20},${cy + 24}`}
        fill="none"
        stroke={accent}
        strokeWidth="5"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
      {/* / */}
      <line
        x1={cx + 8}
        y1={cy - 30}
        x2={cx - 8}
        y2={cy + 30}
        stroke="#cbd5e1"
        strokeWidth="3.5"
        strokeLinecap="round"
      />
      {/* > */}
      <polyline
        points={`${cx + 20},${cy - 24} ${cx + 46},${cy} ${cx + 20},${cy + 24}`}
        fill="none"
        stroke={accent}
        strokeWidth="5"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
    </g>
  );
}

function renderResponsive(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Outer desktop */}
      <rect
        x={cx - 52}
        y={cy - 38}
        width="104"
        height="68"
        rx="5"
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="2"
      />
      {/* Tablet */}
      <rect
        x={cx - 30}
        y={cy - 24}
        width="60"
        height="48"
        rx="4"
        fill="none"
        stroke="#94a3b8"
        strokeWidth="1.5"
      />
      {/* Phone */}
      <rect
        x={cx - 14}
        y={cy - 14}
        width="28"
        height="42"
        rx="4"
        fill="none"
        stroke={accent}
        strokeWidth="2"
      />
      {/* Phone screen */}
      <rect
        x={cx - 10}
        y={cy - 8}
        width="20"
        height="28"
        rx="1"
        fill={accent}
        opacity="0.1"
      />
      {/* Phone home button */}
      <circle cx={cx} cy={cy + 22} r="2" fill={accent} opacity="0.5" />
    </g>
  );
}

function renderServer(cx: number, cy: number, accent: string) {
  const unitH = 22;
  return (
    <g>
      {/* Server units */}
      {[0, 1, 2].map((i) => (
        <g key={i}>
          <rect
            x={cx - 40}
            y={cy - 36 + i * (unitH + 4)}
            width="80"
            height={unitH}
            rx="3"
            fill="#f8fafc"
            stroke="#cbd5e1"
            strokeWidth="1.5"
          />
          {/* Status LEDs */}
          <circle
            cx={cx - 28}
            cy={cy - 36 + i * (unitH + 4) + unitH / 2}
            r="3"
            fill={i === 0 ? accent : "#cbd5e1"}
          />
          <circle
            cx={cx - 18}
            cy={cy - 36 + i * (unitH + 4) + unitH / 2}
            r="3"
            fill={i <= 1 ? accent : "#cbd5e1"}
            opacity={i <= 1 ? 0.6 : 1}
          />
          {/* Drive bays */}
          {[0, 1, 2, 3].map((j) => (
            <rect
              key={j}
              x={cx + 4 + j * 10}
              y={cy - 36 + i * (unitH + 4) + 5}
              width="6"
              height={unitH - 10}
              rx="1"
              fill="#e2e8f0"
            />
          ))}
        </g>
      ))}
      {/* Signal waves */}
      {[10, 18, 26].map((r, i) => (
        <path
          key={i}
          d={`M ${cx + 42 + r} ${cy - 12} Q ${cx + 42 + r + 6} ${cy} ${cx + 42 + r} ${cy + 12}`}
          fill="none"
          stroke={accent}
          strokeWidth="1.5"
          opacity={0.7 - i * 0.2}
        />
      ))}
    </g>
  );
}

function renderTemplate(cx: number, cy: number, accent: string) {
  return (
    <g>
      {/* Grid layout */}
      {[0, 1, 2, 3].map((i) => {
        const row = Math.floor(i / 2);
        const col = i % 2;
        return (
          <rect
            key={i}
            x={cx - 44 + col * 48}
            y={cy - 36 + row * 40}
            width="40"
            height="32"
            rx="4"
            fill="#f1f5f9"
            stroke="#cbd5e1"
            strokeWidth="1.5"
          />
        );
      })}
      {/* Strikethrough diagonal */}
      <line
        x1={cx - 52}
        y1={cy + 44}
        x2={cx + 52}
        y2={cy - 44}
        stroke={accent}
        strokeWidth="3.5"
        strokeLinecap="round"
      />
      <line
        x1={cx - 52}
        y1={cy + 40}
        x2={cx + 52}
        y2={cy - 48}
        stroke="white"
        strokeWidth="1"
        opacity="0.5"
      />
    </g>
  );
}

function renderSync(cx: number, cy: number, accent: string) {
  const r = 36;
  return (
    <g>
      {/* Circular arrows */}
      <path
        d={`M ${cx + r} ${cy} A ${r} ${r} 0 0 1 ${cx - r} ${cy}`}
        fill="none"
        stroke={accent}
        strokeWidth="3"
        strokeLinecap="round"
      />
      <path
        d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
        fill="none"
        stroke="#cbd5e1"
        strokeWidth="3"
        strokeLinecap="round"
      />
      {/* Arrowheads */}
      <polygon
        points={`${cx - r - 6},${cy - 6} ${cx - r + 6},${cy - 6} ${cx - r},${cy + 2}`}
        fill={accent}
      />
      <polygon
        points={`${cx + r - 6},${cy + 6} ${cx + r + 6},${cy + 6} ${cx + r},${cy - 2}`}
        fill="#cbd5e1"
      />
      {/* Data dots flowing */}
      <circle
        cx={cx + 18}
        cy={cy - r + 8}
        r="3.5"
        fill={accent}
        opacity="0.7"
      />
      <circle
        cx={cx - 18}
        cy={cy + r - 8}
        r="3.5"
        fill="#94a3b8"
        opacity="0.7"
      />
      {/* Center node */}
      <circle
        cx={cx}
        cy={cy}
        r="8"
        fill="white"
        stroke="#cbd5e1"
        strokeWidth="1.5"
      />
      <circle cx={cx} cy={cy} r="3" fill={accent} />
    </g>
  );
}

// ─── Icon dispatcher ──────────────────────────────────────────────

const iconRenderers: Record<
  ThumbnailIcon,
  (_cx: number, _cy: number, _accent: string) => React.ReactNode
> = {
  gauge: renderGauge,
  bottleneck: renderBottleneck,
  plugin: renderPlugin,
  shield: renderShield,
  cookie: renderCookie,
  cloud: renderCloud,
  lock: renderLock,
  chart: renderChart,
  leaf: renderLeaf,
  price: renderPrice,
  prototype: renderPrototype,
  gear: renderGear,
  hourglass: renderHourglass,
  code: renderCode,
  responsive: renderResponsive,
  server: renderServer,
  template: renderTemplate,
  sync: renderSync,
};

// ─── Main Component ──────────────────────────────────────────────

export const BlogThumbnailSVG: React.FC<BlogThumbnailSVGProps> = ({
  slug,
  variant = "square",
  className,
}) => {
  const config = blogThumbnails[slug];
  if (!config) return null;

  const isBanner = variant === "banner";
  const vbWidth = isBanner ? 480 : 240;
  const vbHeight = isBanner ? 160 : 240;

  // For banner, we shift the icon more to the right
  const iconCx = isBanner ? 340 : vbWidth / 2;
  const iconCy = vbHeight / 2;

  return (
    <svg
      viewBox={`0 0 ${vbWidth} ${vbHeight}`}
      fill="none"
      xmlns="http://www.w3.org/2000/svg"
      className={className}
      role="img"
      aria-label={`Illustration: ${config.keyword}`}
      preserveAspectRatio="xMidYMid slice"
    >
      {/* Background */}
      <rect
        width={vbWidth}
        height={vbHeight}
        fill="#f8fafc"
        rx={isBanner ? 8 : 12}
      />
      <GridPattern size={30} />
      <rect
        width={vbWidth}
        height={vbHeight}
        fill="url(#grid)"
        rx={isBanner ? 8 : 12}
      />

      {/* Accent strip at top */}
      <rect
        width={vbWidth}
        height="3"
        fill={config.accent}
        opacity="0.6"
        rx="1.5"
      />

      {/* Decorative circuit lines */}
      <line
        x1="0"
        y1={vbHeight - 1}
        x2={vbWidth}
        y2={vbHeight - 1}
        stroke="#e2e8f0"
        strokeWidth="1"
      />

      {/* Corner markers */}
      <g opacity="0.25">
        <line
          x1="12"
          y1="16"
          x2="28"
          y2="16"
          stroke="#94a3b8"
          strokeWidth="1"
        />
        <line
          x1="12"
          y1="16"
          x2="12"
          y2="32"
          stroke="#94a3b8"
          strokeWidth="1"
        />
        <line
          x1={vbWidth - 12}
          y1="16"
          x2={vbWidth - 28}
          y2="16"
          stroke="#94a3b8"
          strokeWidth="1"
        />
        <line
          x1={vbWidth - 12}
          y1="16"
          x2={vbWidth - 12}
          y2="32"
          stroke="#94a3b8"
          strokeWidth="1"
        />
      </g>

      {/* Icon - Scale down for banner to fit height better */}
      <g
        transform={
          isBanner
            ? `translate(${iconCx}, ${iconCy}) scale(0.85) translate(-${iconCx}, -${iconCy})`
            : ""
        }
      >
        {iconRenderers[config.icon](iconCx, iconCy, config.accent)}
      </g>

      {/* Keyword label */}
      <text
        x="18"
        y={vbHeight - 16}
        fontSize="9"
        fontFamily="ui-monospace, monospace"
        fontWeight="700"
        fill="#94a3b8"
        letterSpacing="0.15em"
      >
        {config.keyword}
      </text>

      {/* Accent dot */}
      <circle
        cx={vbWidth - 18}
        cy={vbHeight - 18}
        r="3"
        fill={config.accent}
        opacity="0.6"
      />
    </svg>
  );
};
