/**
 * Line art for the toolbox.
 *
 * Flatsome ships a PNG per element. Drawings are better here: they are a few hundred bytes
 * instead of a folder of bitmaps, they take the colour of the surface they sit on, and they stay
 * sharp on a screen of any density. Every shape lives in the same 24x16 field so the entries
 * line up in the grid.
 *
 * Each value is the inside of an `<svg>`; `stroke` and `fill` come from the wrapper, so a shape
 * only says what it is, not what colour it has.
 */

/** A filled bar, the building block most of these are made of. */
const bar = (x, y, width, height = 2) => `<rect x="${x}" y="${y}" width="${width}" height="${height}" rx="${Math.min(height, 2) / 2}" fill="currentColor" stroke="none"/>`;
/** Several bars under each other, as a paragraph of text. */
const lines = (...widths) => widths.map((width, index) => bar(3, 4 + index * 3.4, width, 1.7)).join('');

export const PREVIEWS = {
  // Aufbau
  section: '<rect x="1" y="3" width="22" height="10" rx="1.5" fill="currentColor" opacity=".14" stroke="none"/><rect x="1" y="3" width="22" height="10" rx="1.5"/>',
  row: '<rect x="1" y="3" width="22" height="10" rx="1.5"/><path d="M12 3.6v8.8"/>',
  column: '<rect x="8" y="1.5" width="8" height="13" rx="1.5"/>',

  // Inhalt
  heading: `${bar(3, 3.6, 18, 3)}${bar(3, 9, 11, 2)}`,
  text: lines(18, 16, 11),
  image: '<rect x="2" y="2.5" width="20" height="11" rx="1.5"/><circle cx="7.5" cy="6.5" r="1.4" fill="currentColor" stroke="none"/><path d="M3.2 12l5-4.4 3.6 3.1 3-2.6 5 3.9"/>',
  button: '<rect x="4" y="4.5" width="16" height="7" rx="2"/>',
  icon: '<path d="M12 2.6l2.7 5.6 6 .8-4.4 4.1 1.1 5.8" transform="scale(.86) translate(2 .4)"/><path d="M12 2.6l-2.7 5.6-6 .8 4.4 4.1-1.1 5.8" transform="scale(.86) translate(2 .4)"/>',
  divider: '<path d="M2 8h20"/>',
  spacer: '<path d="M3 3h18M3 13h18"/><path d="M12 5.6v4.8M10.4 6.8L12 5.2l1.6 1.6M10.4 9.2L12 10.8l1.6-1.6"/>',

  // Bausteine
  iconcard: `<rect x="3" y="2.5" width="4.5" height="4.5" rx="1.2"/>${bar(3, 9, 12, 1.9)}${bar(3, 12, 8, 1.5)}`,
  stat: `${bar(3, 3, 9, 5)}${bar(3, 10.5, 14, 1.7)}`,
  quote: `<path d="M3.4 7.6c0-2 1.3-3.2 2.9-3.4M8.4 7.6c0-2 1.3-3.2 2.9-3.4"/><path d="M3.4 7.6h2.9v3.2H3.4zM8.4 7.6h2.9v3.2H8.4z"/>${bar(14, 5.6, 7, 1.6)}${bar(14, 9, 5, 1.6)}`,
  cta: `${bar(2.5, 4, 12, 2.4)}<rect x="2.5" y="8.6" width="9" height="5" rx="1.6"/><rect x="14.5" y="8.6" width="7" height="5" rx="1.6" fill="currentColor" stroke="none"/>`,
  contact: '<rect x="2.5" y="3.5" width="19" height="9" rx="1.5"/><path d="M2.9 4.4l9.1 5 9.1-5"/>',
  logos: [2.5, 8, 13.5, 19].map(x => `<rect x="${x}" y="5.5" width="4.5" height="5" rx="1.2"/>`).join(''),
  progress: '<rect x="2" y="6" width="20" height="4" rx="2"/><rect x="2" y="6" width="12" height="4" rx="2" fill="currentColor" stroke="none"/>',
  social: [4.5, 12, 19.5].map(x => `<circle cx="${x}" cy="8" r="3"/>`).join('') + '<path d="M3.6 8h1.8M11.1 8h1.8M18.6 8h1.8"/>',

  // Gruppen
  gallery: [2.5, 12.5].flatMap(x => [2.5, 8.5].map(y => `<rect x="${x}" y="${y}" width="9" height="5" rx="1.2"/>`)).join(''),
  accordion: '<rect x="2.5" y="2" width="19" height="4" rx="1.2"/><path d="M18 3.6l1.3 1.3 1.3-1.3"/><rect x="2.5" y="7.5" width="19" height="3" rx="1.2"/><rect x="2.5" y="12" width="19" height="3" rx="1.2"/>',
  accordionitem: '<rect x="2.5" y="5.5" width="19" height="5" rx="1.2"/><path d="M17.6 7.4l1.3 1.3 1.3-1.3"/>',
  tabs: '<rect x="2.5" y="2" width="6" height="3.5" rx="1" fill="currentColor" stroke="none"/><rect x="9.5" y="2" width="6" height="3.5" rx="1"/><rect x="2.5" y="6.5" width="19" height="7.5" rx="1.2"/>',
  tabitem: '<rect x="7" y="2.5" width="10" height="4" rx="1" fill="currentColor" stroke="none"/><rect x="2.5" y="7.5" width="19" height="6" rx="1.2"/>',
  slider: '<rect x="5.5" y="3" width="13" height="10" rx="1.5"/><path d="M3.4 6.6L1.6 8l1.8 1.4M20.6 6.6L22.4 8l-1.8 1.4"/>',

  // Seite und Daten
  postlist: '<rect x="2.5" y="2.5" width="7" height="5" rx="1.2"/><rect x="2.5" y="8.5" width="7" height="5" rx="1.2"/>'
    + `${bar(11.5, 3.2, 10, 1.6)}${bar(11.5, 6, 7, 1.4)}${bar(11.5, 9.2, 10, 1.6)}${bar(11.5, 12, 7, 1.4)}`,
  postnav: '<path d="M9.4 4.6L6 8l3.4 3.4M14.6 4.6L18 8l-3.4 3.4"/><path d="M6.4 8h3.6M14 8h3.6"/>',
  breadcrumb: `${bar(2, 7.2, 5, 1.7)}<path d="M8.6 6.3l1.6 1.7-1.6 1.7"/>${bar(11.6, 7.2, 4, 1.7)}<path d="M17.2 6.3l1.6 1.7-1.6 1.7"/>${bar(20.2, 7.2, 2, 1.7)}`,
  menu: `${bar(2, 7.2, 5, 1.8)}${bar(9, 7.2, 6, 1.8)}${bar(17, 7.2, 5, 1.8)}`,
  form: '<rect x="2.5" y="2" width="19" height="3.6" rx="1.2"/><rect x="2.5" y="6.8" width="19" height="3.6" rx="1.2"/><rect x="2.5" y="11.6" width="8" height="3.4" rx="1.2" fill="currentColor" stroke="none"/>',
  legal: `${bar(2, 4, 20, 1.6)}${bar(2, 7.4, 16, 1.6)}${bar(2, 10.8, 11, 1.6)}`,
  partialref: '<rect x="2.5" y="4.5" width="13" height="9" rx="1.5"/><path d="M6.5 4.5V2h13v9h-2.5"/>',
  embed: '<rect x="2" y="2.5" width="20" height="11" rx="1.5"/><path d="M10.2 5.6l4.6 2.4-4.6 2.4z" fill="currentColor" stroke="none"/>',
};

/** The picture for one element type, ready to drop into the markup. */
export function preview(type) {
  const shape = PREVIEWS[type];
  if (!shape) return '';
  return `<svg viewBox="0 0 24 16" width="34" height="23" fill="none" stroke="currentColor" stroke-width="1.25" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" focusable="false">${shape}</svg>`;
}

/** A row of columns, for the entries that add a row with a column count. */
export function rowPreview(columns) {
  const gap = 1.4;
  const inner = (22 - gap * (columns - 1)) / columns;
  const cells = Array.from({ length: columns }, (_, index) =>
    `<rect x="${(1 + index * (inner + gap)).toFixed(2)}" y="3" width="${inner.toFixed(2)}" height="10" rx="1.2"/>`).join('');
  return `<svg viewBox="0 0 24 16" width="34" height="23" fill="none" stroke="currentColor" stroke-width="1.25" stroke-linejoin="round" aria-hidden="true" focusable="false">${cells}</svg>`;
}