/* QuoteFlow Prototype · shared helpers (Icon, CatTile, useStore, format). */

function qfPascal(name) {
  return name.split(/[-_ ]/).filter(Boolean).map(function (s) { return s[0].toUpperCase() + s.slice(1); }).join('');
}

/* Lucide icon as a pure React SVG (re-render safe). */
function Icon({ name, size = 20, stroke = 2, color = 'currentColor', style, ...rest }) {
  var node = window.lucide && window.lucide.icons[qfPascal(name)];
  if (!node) return null;
  var children = node[2] || [];
  return React.createElement('svg', {
    xmlns: 'http://www.w3.org/2000/svg', width: size, height: size, viewBox: '0 0 24 24',
    fill: 'none', stroke: color, strokeWidth: stroke, strokeLinecap: 'round', strokeLinejoin: 'round', style: style, ...rest,
  }, children.map(function (c, i) { return React.createElement(c[0], Object.assign({ key: i }, c[1])); }));
}

var QF_CAT = {
  solar:   ['var(--cat-solar-bg)', 'var(--cat-solar-fg)', 'sun'],
  battery: ['var(--cat-battery-bg)', 'var(--cat-battery-fg)', 'battery-charging'],
  ev:      ['var(--cat-ev-bg)', 'var(--cat-ev-fg)', 'zap'],
  auto:    ['var(--cat-auto-bg)', 'var(--cat-auto-fg)', 'layout-grid'],
  heat:    ['var(--cat-heat-bg)', 'var(--cat-heat-fg)', 'flame'],
  aircon:  ['var(--cat-aircon-bg)', 'var(--cat-aircon-fg)', 'air-vent'],
  mvhr:    ['var(--cat-mvhr-bg)', 'var(--cat-mvhr-fg)', 'refresh-cw'],
};

function CatTile({ cat, icon, size = 44 }) {
  var c = QF_CAT[cat] || QF_CAT.solar;
  return (
    <span style={{ display: 'inline-flex', alignItems: 'center', justifyContent: 'center',
      width: size, height: size, flex: 'none', borderRadius: 'var(--radius-lg)', background: c[0] }}>
      <Icon name={icon || c[2]} size={size * 0.5} color={c[1]} />
    </span>
  );
}

/* Subscribe a component to the store; returns a bump counter. */
function useStore() {
  var ref = React.useReducer(function (x) { return x + 1; }, 0);
  var force = ref[1];
  React.useEffect(function () { return window.QFStore.subscribe(force); }, []);
  return window.QFStore;
}

var gbp = function (n) { return '£' + Math.round(n).toLocaleString('en-GB'); };
var gbp2 = function (n) { return '£' + n.toLocaleString('en-GB', { minimumFractionDigits: (n % 1 ? 2 : 0), maximumFractionDigits: 2 }); };

/* Trigger a browser download of text content (used for CSV export). */
function downloadText(filename, text, mime) {
  var blob = new Blob([text], { type: (mime || 'text/csv') + ';charset=utf-8;' });
  var url = URL.createObjectURL(blob);
  var a = document.createElement('a');
  a.href = url; a.download = filename;
  document.body.appendChild(a); a.click();
  document.body.removeChild(a);
  setTimeout(function () { URL.revokeObjectURL(url); }, 1000);
}

Object.assign(window, { Icon, CatTile, useStore, qfPascal, QF_CAT, gbp, gbp2, downloadText });