// Native Workflow v2 owns node geometry, mainPath and routing. The portal adds
// multiline typography: upstream's three single-line labels are too small for
// a five-stage reading view. Do not change the pinned vendor or graph semantics.
const escape = text => text.replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;').replaceAll('"', '&quot;');
const wrap = (text, limit = 21) => {
  const lines = [];
  for (const word of text.split(/\s+/)) {
    if (!lines.length || `${lines.at(-1)} ${word}`.length > limit) lines.push(word);
    else lines[lines.length - 1] += ` ${word}`;
  }
  return lines;
};
export function roadmapViewer(html, spec) {
  if (spec.diagram_type !== 'workflow' || spec.schema_version !== 2 || spec.nodes.length !== 5) throw new Error('Roadmap workflow contract drift');
  const boxes = [];
  for (const [index, node] of spec.nodes.entries()) {
    const start = html.indexOf(`<g id="node-${node.id}"`);
    const next = html.indexOf('<text data-node-label=', start);
    const end = html.indexOf('</g>', next) + 4;
    if (start < 0 || next < start || end < next) throw new Error(`Roadmap node drift: ${node.id}`);
    const original = html.slice(start, end);
    const rect = /<rect x="([\d.-]+)" y="([\d.-]+)" width="([\d.]+)" height="([\d.]+)"/.exec(original);
    if (!rect || (original.match(/<text /g) || []).length !== 2) throw new Error(`Roadmap text contract drift: ${node.id}`);
    const [x,y,w,h] = rect.slice(1).map(Number);
    boxes.push({x,y,w,h});
    const text = (value, top, size, cls, attrs = 'data-detail="context"') => {
      const lines = wrap(value, size === 30 ? 18 : 21);
      const maxLines = top === 160 ? 3 : 2;
      if (lines.length > maxLines || lines.some(line => line.length > 21)) throw new Error(`Roadmap copy exceeds card capacity: ${node.id}`);
      return `<text x="${x+24}" y="${y+top}" font-size="${size}" class="${cls}" ${attrs}>${lines.map((line,i) => `<tspan x="${x+24}" dy="${i ? 34 : 0}">${escape(line)}</tspan>`).join('')}</text>`;
    };
    if (!node.sublabel || node.tag || /Output:|Exit:|\n/.test(node.sublabel)) throw new Error(`Roadmap content contract drift: ${node.id}`);
    const content = text(String(index+1), 40, 26, 't-primary', 'data-stage-number="" font-weight="700"')
      + text(node.label, 88, 30, 't-primary', 'data-node-label="" font-weight="700"')
      + text(node.sublabel, 160, 26, 't-muted');
    // Preserve native node title/metadata and rectangles; replace sigil/text only.
    // Sigils are nested SVG groups. Anchor on the two native node rectangles.
    const rectangles = [...original.matchAll(/<rect\b[^>]*\/>/g)];
    if (rectangles.length !== 2) throw new Error('Roadmap shape contract drift');
    const prefixEnd = rectangles[1].index + rectangles[1][0].length;
    const replacement = original.slice(0,prefixEnd).replaceAll('rx="6"', 'rx="0"') + content + '</g>';
    html = html.slice(0,start) + replacement + html.slice(end);
  }
  const left = Math.min(...boxes.map(b => b.x)) - 12;
  const top = Math.min(...boxes.map(b => b.y)) - 12;
  const width = Math.max(...boxes.map(b => b.x+b.w)) - left + 12;
  const height = Math.max(...boxes.map(b => b.y+b.h)) - top + 12;
  // One editorial lane; its title/frame would repeat the page's framing.
  html = html.replace(/<rect\b[^>]*data-composition-frame-kind="lane"[^>]*\/>\s*<text\b[^>]*>[\s\S]*?<\/text>/g, '');
  const roots = [...html.matchAll(/<svg\b[^>]*role="img"[^>]*>/g)];
  if (roots.length !== 1) throw new Error('Roadmap SVG contract drift');
  const root = roots[0][0].replace(/viewBox="[^"]*"/, `viewBox="${left} ${top} ${width} ${height}"`);
  const styles = `<style id="eldorado-roadmap-typography">
    [data-node-id] text {font-family: Arial, sans-serif;}
    svg[data-preset="classic"] [data-node-id] > rect.c-backend,
    svg[data-preset="editorial"] [data-node-id] > rect.c-backend {fill:var(--panel); stroke:var(--border);}
    .c-grid {opacity:0;}

  </style>`;
  html = html.replace(roots[0][0], root + styles);
  return html;
}