// Native editable geometry and edges; scoped editorial typography for Stage 01.
export const isSkillsStory = name => /^strategy-(governance|quality|adoption|measurement|baseline|maintenance|stage01|stage02|six-months)(-mobile)?$/.test(name);
const escape = text => text.replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;').replaceAll('"', '&quot;');
export function skillsViewer(html, spec) {
  if (spec.diagram_type !== 'architecture' || !spec.components.length) throw new Error('Skills story contract drift');
  const stageMobile = /strategy-(stage0[12]|six-months)-mobile\//.test(spec.meta.output);
  const detailSize = stageMobile ? 38 : spec.meta.output.includes('-mobile/') ? 34 : 32;
  for (const node of spec.components) {
    const pattern = new RegExp(`<g\\b[^>]*data-node-id="${node.id}"[^>]*>[\\s\\S]*?<text data-node-label=[\\s\\S]*?</g>`);
    const match = html.match(pattern);
    if (!match) throw new Error(`Missing Skills node: ${node.id}`);
    const original = match[0];
    const rectangles = [...original.matchAll(/<rect\b[^>]*class="c-[^"]+"[^>]*\/>/g)];
    if (rectangles.length !== 2) throw new Error('Skills shape contract drift');
    const [x,y] = node.pos;
    const lines = node.sublabel.split('\n');
    if (!node.tag || !node.sublabel || lines.length > 4) throw new Error(`Skills copy exceeds capacity: ${node.id}`);
    const text = (value, top, size, attrs) => `<text x="${x+28}" y="${y+top}" font-size="${size}" ${attrs}>${escape(value)}</text>`;
    const content = text(node.tag, 40, detailSize, 'class="t-muted" data-detail="context"')
      + text(node.label, 89, stageMobile ? 40 : 36, 'class="t-primary" data-node-label="" font-weight="700"')
      + lines.map((line,i) => text(line, 138+i*42, detailSize, 'class="t-primary" data-detail="context"')).join('');
    const prefix = original.slice(0,rectangles[1].index+rectangles[1][0].length).replaceAll('rx="6"','rx="0"');
    html = html.replace(original,prefix+content+'</g>');
  }
  const roots = [...html.matchAll(/<svg\b[^>]*role="img"[^>]*>/g)];
  if (roots.length !== 1) throw new Error('Skills SVG contract drift');
  const [width,height] = spec.meta.viewBox;
  const root = roots[0][0].replace(/viewBox="[^"]*"/,`viewBox="0 0 ${width} ${height}"`);
  // Embedded in SVG so downloaded files retain typography without the viewer.
  html = html.replace(roots[0][0],root+`<style id="eldorado-skills-typography">
    [data-node-id] text {font-family:Arial,sans-serif;}
    rect[fill="url(#grid)"] {opacity:0;}
    [data-node-id] > rect:not(.c-mask) {stroke-width:3;}
    [data-edge-id] {opacity:1;}
  </style>`);
  // Native labels use tiny technical annotations. Enlarge both text and mask,
  // retaining the native edge identity, routing and explicit label position.
  html = html.replace(/(<g data-detail="context"[^>]*data-edge-id[^>]*>)([\s\S]*?)(<\/g>)/g, (all,open,body,close) => {
    const text = body.match(/<text x="([^"]+)" y="([^"]+)"([^>]*)>([\s\S]*?)<\/text>/);
    if (!text) throw new Error('Skills edge label contract drift');
    const x=Number(text[1]), y=Number(text[2]), width=text[4].replace(/&[^;]+;/g,'x').length*17+24;
    return open+`<rect x="${x-width/2}" y="${y-34}" width="${width}" height="44" class="c-mask"/>`+text[0].replace('font-size="8"',`font-size="${detailSize}"`)+close;
  });
  return html;
}