/**
 * To Title Case 2.1 - http://individed.com/code/to-title-case/
 * Copyright 2008-2013 David Gouch. Licensed under the MIT License.
 * https://github.com/gouch/to-title-case
 */

import trim from './trim';

const smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;

export default function toTitleCase(string) {
  return trim(string).replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, (match, index, title) => {
    if (index > 0 &&
        index + match.length !== title.length &&
        match.search(smallWords) > -1 &&
        title.charAt(index - 2) !== ':' &&
        (title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
        title.charAt(index - 1).search(/[^\s-]/) < 0) {
      return match.toLowerCase();
    }

    if (match.substr(1).search(/[A-Z]|\../) > -1) {
      return match;
    }

    return match.charAt(0).toUpperCase() + match.substr(1);
  });
}
