'use strict';

/**
 * cardRenderer — one card engine, per-template layouts.
 *
 * SVG rather than canvas: it is text, so it has no native dependency, it
 * diffs in review, and the numbers inside it are greppable — which matters when
 * the whole claim is that the numbers are real. A card whose contents cannot be
 * inspected without opening an image is a bad fit for a Truth-Law product.
 *
 * The card never formats its own facts. Every string arrives already rendered
 * and already gate-checked by contentEngine, so a caption and a card physically
 * cannot disagree.
 */

const BRAND = Object.freeze({
  bg: '#05070A',
  panel: '#0A0E14',
  line: '#1A222E',
  green: '#00D4A0',       // the R
  white: '#FFFFFF',       // VYND
  dim: '#6B7A8D',
  amber: '#FFB347',
  mono: "ui-monospace, 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace",
});

const W = 1080;
const H = 1350;

const esc = (s) => String(s)
  .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
  .replace(/"/g, '&quot;');

/** The slashed-Y wordmark: VYND white, R green. */
function wordmark(x, y, size = 34) {
  return `
  <g font-family="${BRAND.mono}" font-size="${size}" font-weight="800" letter-spacing="${size * 0.09}">
    <text x="${x}" y="${y}" fill="${BRAND.white}">VYND</text>
    <text x="${x + size * 2.92}" y="${y}" fill="${BRAND.green}">R</text>
    <line x1="${x + size * 1.02}" y1="${y - size * 0.78}" x2="${x + size * 1.42}" y2="${y + size * 0.22}"
          stroke="${BRAND.green}" stroke-width="${Math.max(2, size * 0.07)}" opacity=".85"/>
  </g>`;
}

/**
 * Render a card model to SVG.
 * @param {object} card { kind, title, subtitle, lines[], footer }
 */
function toSvg(card = {}) {
  const lines = card.lines || [];
  let y = 300;
  const body = lines.map((l) => {
    const text = typeof l === 'string' ? l : l.text;
    const style = (typeof l === 'object' && l.style) || 'body';
    let out = '';
    if (style === 'rule') {
      out = `<line x1="72" y1="${y - 18}" x2="${W - 72}" y2="${y - 18}" stroke="${BRAND.line}" stroke-width="1"/>`;
      y += 26;
      return out;
    }
    const size = style === 'lead' ? 46 : style === 'stat' ? 40 : 30;
    const fill = style === 'stat' ? BRAND.green : style === 'dim' ? BRAND.dim : BRAND.white;
    const weight = style === 'body' ? 500 : 800;
    out = `<text x="72" y="${y}" font-family="${BRAND.mono}" font-size="${size}" font-weight="${weight}" fill="${fill}">${esc(text)}</text>`;
    y += size + (style === 'lead' ? 26 : 18);
    return out;
  }).join('\n');

  return `<svg xmlns="http://www.w3.org/2000/svg" width="${W}" height="${H}" viewBox="0 0 ${W} ${H}">
  <rect width="${W}" height="${H}" fill="${BRAND.bg}"/>
  <rect x="40" y="40" width="${W - 80}" height="${H - 80}" fill="${BRAND.panel}" stroke="${BRAND.line}"/>
  ${Array.from({ length: 26 }, (_, i) => `<line x1="40" y1="${52 * i + 40}" x2="${W - 40}" y2="${52 * i + 40}" stroke="${BRAND.white}" stroke-width="1" opacity=".02"/>`).join('')}
  ${wordmark(72, 128)}
  ${card.title ? `<text x="72" y="212" font-family="${BRAND.mono}" font-size="54" font-weight="800" fill="${BRAND.white}" letter-spacing="1">${esc(card.title)}</text>` : ''}
  ${card.subtitle ? `<text x="72" y="256" font-family="${BRAND.mono}" font-size="26" font-weight="600" fill="${BRAND.dim}" letter-spacing="2">${esc(card.subtitle)}</text>` : ''}
  <line x1="72" y1="272" x2="${W - 72}" y2="272" stroke="${BRAND.green}" stroke-width="2" opacity=".55"/>
  ${body}
  <text x="72" y="${H - 96}" font-family="${BRAND.mono}" font-size="22" font-weight="600" fill="${BRAND.dim}">${esc(card.footer || 'Every number here is measured. Nothing is projected.')}</text>
  <text x="72" y="${H - 62}" font-family="${BRAND.mono}" font-size="20" font-weight="500" fill="${BRAND.line}">vyndr · built by Kevon Butler · Detroit</text>
</svg>`;
}

module.exports = { toSvg, BRAND, W, H };