import { warnOnce } from '@unocss/core';

function encodeSvgForCss(svg) {
  let useSvg = svg.startsWith("<svg>") ? svg.replace("<svg>", "<svg >") : svg;
  if (!useSvg.includes(" xmlns:xlink=") && useSvg.includes(" xlink:")) {
    useSvg = useSvg.replace("<svg ", '<svg xmlns:xlink="http://www.w3.org/1999/xlink" ');
  }
  if (!useSvg.includes(" xmlns=")) {
    useSvg = useSvg.replace("<svg ", '<svg xmlns="http://www.w3.org/2000/svg" ');
  }
  return useSvg.replace(/"/g, "'").replace(/%/g, "%25").replace(/#/g, "%23").replace(/{/g, "%7B").replace(/}/g, "%7D").replace(/</g, "%3C").replace(/>/g, "%3E");
}

const COLLECTION_NAME_PARTS_MAX = 3;
function createPresetIcons(lookupIconLoader) {
  return function presetIcons(options = {}) {
    const {
      scale = 1,
      mode = "auto",
      prefix = "i-",
      warn = false,
      collections: customCollections,
      extraProperties = {},
      customizations = {},
      autoInstall = false,
      layer = "icons",
      unit
    } = options;
    const loaderOptions = {
      addXmlNs: true,
      scale,
      customCollections,
      autoInstall,
      warn: void 0,
      customizations: {
        ...customizations,
        additionalProps: { ...extraProperties },
        trimCustomSvg: true,
        async iconCustomizer(collection, icon, props) {
          await customizations.iconCustomizer?.(collection, icon, props);
          if (unit) {
            if (!props.width)
              props.width = `${scale}${unit}`;
            if (!props.height)
              props.height = `${scale}${unit}`;
          }
        }
      }
    };
    let iconLoader;
    return {
      name: "@unocss/preset-icons",
      enforce: "pre",
      options,
      layers: { icons: -30 },
      rules: [[
        /^([a-z0-9:-]+)(?:\?(mask|bg|auto))?$/,
        async ([full, body, _mode = mode]) => {
          let collection = "";
          let name = "";
          let svg;
          iconLoader = iconLoader || await lookupIconLoader(options);
          const usedProps = {};
          if (body.includes(":")) {
            [collection, name] = body.split(":");
            svg = await iconLoader(collection, name, { ...loaderOptions, usedProps });
          } else {
            const parts = body.split(/-/g);
            for (let i = COLLECTION_NAME_PARTS_MAX; i >= 1; i--) {
              collection = parts.slice(0, i).join("-");
              name = parts.slice(i).join("-");
              svg = await iconLoader(collection, name, { ...loaderOptions, usedProps });
              if (svg)
                break;
            }
          }
          if (!svg) {
            if (warn)
              warnOnce(`failed to load icon "${full}"`);
            return;
          }
          const url = `url("data:image/svg+xml;utf8,${encodeSvgForCss(svg)}")`;
          if (_mode === "auto")
            _mode = svg.includes("currentColor") ? "mask" : "bg";
          if (_mode === "mask") {
            return {
              "--un-icon": url,
              "mask": "var(--un-icon) no-repeat",
              "mask-size": "100% 100%",
              "-webkit-mask": "var(--un-icon) no-repeat",
              "-webkit-mask-size": "100% 100%",
              "background-color": "currentColor",
              ...usedProps
            };
          } else {
            return {
              "background": `${url} no-repeat`,
              "background-size": "100% 100%",
              "background-color": "transparent",
              ...usedProps
            };
          }
        },
        { layer, prefix }
      ]]
    };
  };
}
function combineLoaders(loaders) {
  return (...args) => {
    for (const loader of loaders) {
      const result = loader(...args);
      if (result)
        return result;
    }
  };
}

export { combineLoaders, createPresetIcons };