---
/**
 * The method as a closed loop of four stages, drawn as a spec-sheet diagram.
 * Main nodes sit on the corners of the loop with their labels inside;
 * each stage's instruments fan outwards. Wide and tall compositions of the same drawing.
 */
interface Stage { title: string; items: string[] }
interface Props { title: string; desc: string; stages: Stage[] }
const { title, desc, stages } = Astro.props;

const stroke = 1.25;
const ring = 36;

/* Wide composition: 1400 x 560. Nodes on the corners of a loop. */
const W = { w: 1400, h: 560, x1: 420, x2: 980, y1: 140, y2: 420, sat: 175, dy: 62 };
const wideNodes = [
  { x: W.x1, y: W.y1, side: -1, up: -1 }, // top-left: threat analysis
  { x: W.x2, y: W.y1, side: 1, up: -1 },  // top-right: engineering
  { x: W.x2, y: W.y2, side: 1, up: 1 },   // bottom-right: verification
  { x: W.x1, y: W.y2, side: -1, up: 1 },  // bottom-left: monitoring
];

/* Tall composition: 400 x 780. Nodes stacked on a spine, the loop closes on the left.
   The title sits right of the node, its instruments hang below the title. */
const T = { w: 400, h: 780, x: 60, loopX: 20, y0: 60, step: 200, ring: 28, labelX: 40, satX: 44, satY: 36, dy: 28 };
const tallNodes = stages.map((_, i) => ({ x: T.x, y: T.y0 + i * T.step }));

/* Direction tick: a small chevron at the midpoint of an edge, pointing along it. */
const tick = (x: number, y: number, dx: number, dy: number, s = 7) => {
  const len = Math.hypot(dx, dy) || 1; const ux = dx / len, uy = dy / len;
  const px = -uy, py = ux;
  return `${x - ux * s + px * s},${y - uy * s + py * s} ${x},${y} ${x - ux * s - px * s},${y - uy * s - py * s}`;
};
---
<svg class="diagram diagram--wide" viewBox={`0 0 ${W.w} ${W.h}`} role="img" aria-labelledby="method-w-title method-w-desc" xmlns="http://www.w3.org/2000/svg">
  <title id="method-w-title">{title}</title>
  <desc id="method-w-desc">{desc}</desc>
  <g fill="none" stroke="currentColor" stroke-width={stroke} stroke-linecap="square" vector-effect="non-scaling-stroke">
    <rect x={W.x1} y={W.y1} width={W.x2 - W.x1} height={W.y2 - W.y1} />
    <polyline points={tick((W.x1 + W.x2) / 2, W.y1, 1, 0)} />
    <polyline points={tick(W.x2, (W.y1 + W.y2) / 2, 0, 1)} />
    <polyline points={tick((W.x1 + W.x2) / 2, W.y2, -1, 0)} />
    <polyline points={tick(W.x1, (W.y1 + W.y2) / 2, 0, -1)} />
    {wideNodes.map((n, i) => (
      <g>
        <circle cx={n.x} cy={n.y} r={ring} stroke-dasharray="2 5" />
        {stages[i].items.map((_, k) => {
          const sx = n.x + n.side * W.sat;
          const sy = n.y + (k - 1) * W.dy;
          return <line x1={n.x} y1={n.y} x2={sx} y2={sy} class="diagram__branch" />;
        })}
      </g>
    ))}
  </g>
  <g fill="currentColor">
    {wideNodes.map((n, i) => (
      <g>
        <circle cx={n.x} cy={n.y} r="5" />
        {stages[i].items.map((_, k) => <circle cx={n.x + n.side * W.sat} cy={n.y + (k - 1) * W.dy} r="3" class="diagram__dot" />)}
      </g>
    ))}
  </g>
  <g class="diagram__labels" font-size="17" font-weight="500">
    {wideNodes.map((n, i) => (
      <text x={n.x - n.side * (ring + 14)} y={n.y - n.up * 30 + 6} text-anchor={n.side < 0 ? 'start' : 'end'}>{stages[i].title}</text>
    ))}
  </g>
  <g class="diagram__meta" font-size="15">
    {wideNodes.map((n, i) => stages[i].items.map((item, k) => (
      <text x={n.x + n.side * (W.sat + 14)} y={n.y + (k - 1) * W.dy + 5} text-anchor={n.side < 0 ? 'end' : 'start'}>{item}</text>
    )))}
  </g>
</svg>

<svg class="diagram diagram--tall" viewBox={`0 0 ${T.w} ${T.h}`} role="img" aria-labelledby="method-t-title method-t-desc" xmlns="http://www.w3.org/2000/svg">
  <title id="method-t-title">{title}</title>
  <desc id="method-t-desc">{desc}</desc>
  <g fill="none" stroke="currentColor" stroke-width={stroke} stroke-linecap="square" vector-effect="non-scaling-stroke">
    <line x1={T.x} y1={tallNodes[0].y} x2={T.x} y2={tallNodes[3].y} />
    <polyline points={`${T.x},${tallNodes[3].y} ${T.loopX},${tallNodes[3].y} ${T.loopX},${tallNodes[0].y} ${T.x},${tallNodes[0].y}`} />
    {tallNodes.slice(0, 3).map((n) => <polyline points={tick(T.x, n.y + T.step / 2 + 20, 0, 1)} />)}
    <polyline points={tick(T.loopX, (tallNodes[0].y + tallNodes[3].y) / 2, 0, -1)} />
    {tallNodes.map((n, i) => (
      <g>
        <circle cx={n.x} cy={n.y} r={T.ring} stroke-dasharray="2 5" />
        {stages[i].items.map((_, k) => <line x1={n.x} y1={n.y} x2={n.x + T.satX} y2={n.y + T.satY + k * T.dy} class="diagram__branch" />)}
      </g>
    ))}
  </g>
  <g fill="currentColor">
    {tallNodes.map((n, i) => (
      <g>
        <circle cx={n.x} cy={n.y} r="5" />
        {stages[i].items.map((_, k) => <circle cx={n.x + T.satX} cy={n.y + T.satY + k * T.dy} r="3" class="diagram__dot" />)}
      </g>
    ))}
  </g>
  <g class="diagram__labels" font-size="16" font-weight="500">
    {tallNodes.map((n, i) => <text x={n.x + T.labelX} y={n.y + 6}>{stages[i].title}</text>)}
  </g>
  <g class="diagram__meta" font-size="14">
    {tallNodes.map((n, i) => stages[i].items.map((item, k) => (
      <text x={n.x + T.satX + 12} y={n.y + T.satY + k * T.dy + 5}>{item}</text>
    )))}
  </g>
</svg>

<style>
  .diagram {
    width: 100%;
    height: auto;
    color: var(--ink);
    font-family: var(--font-sans);
  }
  .diagram__labels { fill: var(--ink); }
  .diagram__meta { fill: var(--ink-muted); }
  .diagram__branch { stroke: var(--line); }
  .diagram__dot { fill: var(--ink-muted); }
  .diagram--tall { display: none; }
  /* Below 64rem the wide drawing would scale its labels under 11px; the tall one takes over. */
  @media (max-width: 63.99rem) {
    .diagram--wide { display: none; }
    .diagram--tall { display: block; max-width: 26rem; }
  }
</style>