import { useEffect, useRef } from 'react';

interface Props {
  technical: string[];
  soft: string[];
}

export default function PatchBay({ technical, soft }: Props) {
  const containerRef = useRef<HTMLDivElement>(null);
  const svgRef = useRef<SVGSVGElement>(null);

  useEffect(() => {
    const container = containerRef.current;
    const svg = svgRef.current;
    if (!container || !svg) return;

    function drawCables() {
      if (!svg || !container) return;
      const rect = container.getBoundingClientRect();
      const width = rect.width;
      const height = rect.height;
      svg.setAttribute('viewBox', `0 0 ${width} ${height}`);
      svg.setAttribute('width', String(width));
      svg.setAttribute('height', String(height));

      // Find left + right jack positions
      const leftJacks = container.querySelectorAll<HTMLElement>('[data-jack="left"]');
      const rightJacks = container.querySelectorAll<HTMLElement>('[data-jack="right"]');
      const cr = container.getBoundingClientRect();

      const leftPoints = Array.from(leftJacks).map((el) => {
        const r = el.getBoundingClientRect();
        return { x: r.right - cr.left, y: r.top + r.height / 2 - cr.top };
      });
      const rightPoints = Array.from(rightJacks).map((el) => {
        const r = el.getBoundingClientRect();
        return { x: r.left - cr.left, y: r.top + r.height / 2 - cr.top };
      });

      // Build cable paths pairing left to right
      const colors = ['var(--color-cyan)', 'var(--color-magenta)', 'var(--color-acid)'];
      svg.innerHTML = '';
      leftPoints.forEach((p1, i) => {
        const pairIdx = i % rightPoints.length;
        const p2 = rightPoints[pairIdx];
        if (!p2) return;
        const dx = p2.x - p1.x;
        const sag = 20 + (i % 3) * 8;
        const midY = (p1.y + p2.y) / 2 + sag;
        const c1x = p1.x + dx * 0.4;
        const c2x = p1.x + dx * 0.6;
        const d = `M ${p1.x} ${p1.y} C ${c1x} ${midY}, ${c2x} ${midY}, ${p2.x} ${p2.y}`;

        const path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
        path.setAttribute('d', d);
        path.setAttribute('fill', 'none');
        path.setAttribute('stroke', colors[i % colors.length]);
        path.setAttribute('stroke-width', '1.6');
        path.setAttribute('stroke-opacity', '0.55');
        path.style.filter = `drop-shadow(0 0 4px ${colors[i % colors.length]})`;
        svg.appendChild(path);

        // Plug tips
        [p1, p2].forEach((p) => {
          const circle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
          circle.setAttribute('cx', String(p.x));
          circle.setAttribute('cy', String(p.y));
          circle.setAttribute('r', '3');
          circle.setAttribute('fill', colors[i % colors.length]);
          circle.style.filter = `drop-shadow(0 0 6px ${colors[i % colors.length]})`;
          svg.appendChild(circle);
        });
      });
    }

    drawCables();
    const ro = new ResizeObserver(drawCables);
    ro.observe(container);
    window.addEventListener('resize', drawCables);
    return () => {
      ro.disconnect();
      window.removeEventListener('resize', drawCables);
    };
  }, [technical.length, soft.length]);

  return (
    <div
      ref={containerRef}
      className="relative grid grid-cols-1 sm:grid-cols-2 md:grid-cols-[1fr_auto_1fr] gap-6 sm:gap-10 md:gap-20 bg-[color:var(--color-surface)] border border-[color:var(--color-border)] rounded-sm p-5 sm:p-6 md:p-10"
    >
      {/* Left panel : technical */}
      <div>
        <h3 className="stencil text-sm uppercase tracking-[0.25em] text-[color:var(--color-cyan)] glow-text-cyan mb-4">
          Techniques
        </h3>
        <ul className="space-y-2.5">
          {technical.map((s) => (
            <li key={s} className="flex items-center gap-3 font-mono text-xs uppercase tracking-wider">
              <span className="text-[color:var(--color-text-muted)] flex-1">{s}</span>
              <span
                data-jack="left"
                className="w-3 h-3 rounded-full border-2 border-[color:var(--color-cyan)] bg-[color:var(--color-bg)]"
                style={{ boxShadow: `inset 0 0 0 1px #000` }}
              />
            </li>
          ))}
        </ul>
      </div>

      {/* Middle : SVG cables */}
      <div className="hidden md:block relative min-h-full">
        <svg
          ref={svgRef}
          className="absolute inset-0 pointer-events-none"
          xmlns="http://www.w3.org/2000/svg"
        />
      </div>

      {/* Right panel : soft */}
      <div>
        <h3 className="stencil text-sm uppercase tracking-[0.25em] text-[color:var(--color-magenta)] glow-text-magenta mb-4">
          Transverses
        </h3>
        <ul className="space-y-2.5">
          {soft.map((s) => (
            <li key={s} className="flex items-center gap-3 font-mono text-xs uppercase tracking-wider">
              <span
                data-jack="right"
                className="w-3 h-3 rounded-full border-2 border-[color:var(--color-magenta)] bg-[color:var(--color-bg)]"
                style={{ boxShadow: `inset 0 0 0 1px #000` }}
              />
              <span className="text-[color:var(--color-text-muted)] flex-1">{s}</span>
            </li>
          ))}
        </ul>
      </div>
    </div>
  );
}