import { sliceWrap } from './sliceWrap.ts'

/**
 * Generates lorem ipsum text.
 *
 * @param {number} [count=4] - The number of words, sentences, or paragraphs to generate. Default is
 *   `4`
 * @param {'words' | 'sentences' | 'paragraphs'} [units='sentences'] - The units to generate.
 *   Default is `'sentences'`
 * @returns {string} The generated text.
 */
export function loremIpsum(
  count: number = 4,
  units: 'words' | 'sentences' | 'paragraphs' = 'sentences',
): string {
  switch (units) {
    case 'words':
      return wordsToSentence(sliceWrap(WORDS, 0, count))
    case 'sentences':
      return sliceWrap(SENTENCES, 0, count)
        .map((sentence) => wordsToSentence(sentence.words))
        .join(' ')
    case 'paragraphs':
      return sliceWrap(PARAGRAPHS, 0, count)
        .map((paragraph) =>
          paragraph.sentences.map((sentence) => wordsToSentence(sentence.words)).join(' '),
        )
        .join('\n')
  }
}

function wordsToSentence(words: string[]) {
  let sentence = ''
  for (const word of words) {
    if (sentence.length > 0) sentence += ' '
    sentence += word
  }
  if (sentence.endsWith(',')) {
    sentence = sentence.slice(0, -1)
  }
  if (sentence.length > 0 && !sentence.endsWith('.')) {
    sentence += '.'
  }
  return sentence
}

const LOREM_IPSUM = {
  paragraphs: [
    {
      sentences: [
        {
          words: [
            'Lorem',
            'ipsum',
            'dolor',
            'sit',
            'amet,',
            'consectetur',
            'adipiscing',
            'elit,',
            'sed',
            'do',
            'eiusmod',
            'tempor',
            'incididunt',
            'ut',
            'labore',
            'et',
            'dolore',
            'magna',
            'aliqua.',
          ],
        },
        {
          words: [
            'Ut',
            'enim',
            'ad',
            'minim',
            'veniam,',
            'quis',
            'nostrud',
            'exercitation',
            'ullamco',
            'laboris',
            'nisi',
            'ut',
            'aliquip',
            'ex',
            'ea',
            'commodo',
            'consequat.',
          ],
        },
        {
          words: [
            'Duis',
            'aute',
            'irure',
            'dolor',
            'in',
            'reprehenderit',
            'in',
            'voluptate',
            'velit',
            'esse',
            'cillum',
            'dolore',
            'eu',
            'fugiat',
            'nulla',
            'pariatur.',
          ],
        },
        {
          words: [
            'Excepteur',
            'sint',
            'occaecat',
            'cupidatat',
            'non',
            'proident,',
            'sunt',
            'in',
            'culpa',
            'qui',
            'officia',
            'deserunt',
            'mollit',
            'anim',
            'id',
            'est',
            'laborum.',
          ],
        },
      ],
    },
  ],
}

const PARAGRAPHS = LOREM_IPSUM.paragraphs
const SENTENCES = PARAGRAPHS.flatMap((paragraph) => paragraph.sentences)
const WORDS = SENTENCES.flatMap((sentence) => sentence.words)