import { deburr } from './deburr.ts';
import { words } from './words.ts';
import { normalizeForCase } from '../_internal/normalizeForCase.ts';

/**
 * Converts a string to upper case.
 *
 * Upper case is the naming convention in which each word is written in uppercase and separated by an space ( ) character.
 *
 * @param str - The string that is to be changed to upper case.
 * @returns The converted string to upper case.
 *
 * @example
 * const convertedStr1 = upperCase('camelCase') // returns 'CAMEL CASE'
 * const convertedStr2 = upperCase('some whitespace') // returns 'SOME WHITESPACE'
 * const convertedStr3 = upperCase('hyphen-text') // returns 'HYPHEN TEXT'
 * const convertedStr4 = upperCase('HTTPRequest') // returns 'HTTP REQUEST'
 */
export function upperCase(str?: string): string {
  return words(normalizeForCase(deburr(str)))
    .map(word => word.toUpperCase())
    .join(' ');
}
