/**
 * Webpack loader for SVG icons in svgs/ directory.
 * Transforms SVG files into Iconify-compatible objects: { width, height, body }
 * - single-color/: replaces fill/stroke colors with currentColor
 * - multi-color/: preserves original colors
 */

let iconifyToolsPromise = null;

function getIconifyTools() {
  if (!iconifyToolsPromise) {
    iconifyToolsPromise = import('@iconify/tools');
  }
  return iconifyToolsPromise;
}

module.exports = async function svgIconLoader(source) {
  const callback = this.async();
  const resourcePath = this.resourcePath;
  const isSingleColor = resourcePath.includes('single-color');

  try {
    const { SVG, cleanupSVG, parseColors, isEmptyColor } = await getIconifyTools();

    // Multi-color icons containing <image> tag: extract as-is
    if (!isSingleColor && source.includes('<image')) {
      const viewBox = source.match(/viewBox="([^"]+)"/)?.[1] || '0 0 1 1';
      const parts = viewBox.split(' ').map(Number);
      const width = parts[2] || 1;
      const height = parts[3] || 1;
      const innerContent = source.replace(/<svg[^>]*>([\s\S]*)<\/svg>/i, '$1');
      callback(null, `export default ${JSON.stringify({ width, height, body: innerContent })}`);
      return;
    }

    const svg = new SVG(source);
    await cleanupSVG(svg);

    if (isSingleColor) {
      parseColors(svg, {
        defaultColor: 'currentColor',
        callback: (_, colorStr, color) => {
          return !color || isEmptyColor(color) ? colorStr : 'currentColor';
        },
      });
    }

    const width = svg.viewBox.width;
    const height = svg.viewBox.height;
    const optimizedSvg = svg.toMinifiedString();
    const innerContent = optimizedSvg.replace(/<svg[^>]*>([\s\S]*)<\/svg>/i, '$1');

    callback(null, `export default ${JSON.stringify({ width, height, body: innerContent })}`);
  } catch (err) {
    callback(err);
  }
};