import path from "path";
import hq from "alias-hq";

function escapeStringRegexp(string) {
  return string.replace(/[|\\{}()[\]^$+*?.]/g, "\\$&").replace(/-/g, "\\x2d");
}

export default hq.get(({ rootUrl, baseUrl, paths }) => {
  return (importPath) => {
    if (!importPath.includes("@")) {
      return importPath;
    }
    const basePath = path.join(rootUrl, baseUrl);
    for (const [aliasedPath, replacements] of Object.entries(paths)) {
      const regexp = new RegExp(
        "(^|.*/)" + escapeStringRegexp(aliasedPath).replace("\\*", "(.*)")
      );
      importPath = importPath.replace(
        regexp,
        path.join(basePath, replacements[0]).replace("*", "$2")
      );
    }
    return importPath;
  };
});