const { hasOwnProperty } = Object.prototype;

function hasOwn(obj, key) {
  return hasOwnProperty.call(obj, key);
}

const RE_NARGS = /(%|)\{\{\s*([0-9a-zA-Z_]+)\s*\}\}/g;

/**
 *  String format template
 */
export function template(string: string, ...rawArgs: any[]) {
  let args: any = rawArgs;
  if (args.length === 1 && typeof args[0] === 'object') {
    args = args[0];
  }

  if (!args?.hasOwnProperty) {
    args = {};
  }

  return string.replace(RE_NARGS, (match, prefix, i, index) => {
    if (string[index - 1] === '{'
        && string[index + match.length] === '}') {
      return i;
    }
    const result = hasOwn(args, i) ? args[i] : null;
    if (result === null || result === undefined) {
      return '';
    }

    return result;
  });
}