const crypto = require('crypto');

const WORD_LISTS = {
  lorem: [
    'lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur', 'adipiscing', 'elit',
    'sed', 'do', 'eiusmod', 'tempor', 'incididunt', 'ut', 'labore', 'et', 'dolore',
    'magna', 'aliqua', 'enim', 'ad', 'minim', 'veniam', 'quis', 'nostrud',
    'exercitation', 'ullamco', 'laboris', 'nisi', 'aliquip', 'ex', 'ea', 'commodo',
    'consequat', 'duis', 'aute', 'irure', 'in', 'reprehenderit', 'voluptate',
    'velit', 'esse', 'cillum', 'fugiat', 'nulla', 'pariatur', 'excepteur', 'sint',
    'occaecat', 'cupidatat', 'non', 'proident', 'sunt', 'culpa', 'qui', 'officia',
    'deserunt', 'mollit', 'anim', 'id', 'est', 'laborum'
  ],
  english: [
    'the', 'quick', 'brown', 'fox', 'jumps', 'over', 'lazy', 'dog', 'and', 'runs',
    'through', 'forest', 'while', 'birds', 'sing', 'beautiful', 'songs', 'under',
    'bright', 'sunny', 'sky', 'with', 'clouds', 'floating', 'peacefully', 'above',
    'green', 'trees', 'beside', 'flowing', 'river', 'where', 'fish', 'swim',
    'quietly', 'among', 'rocks', 'covered', 'moss', 'creating', 'natural', 'harmony'
  ],
  tech: [
    'algorithm', 'database', 'framework', 'library', 'function', 'variable', 'array',
    'object', 'method', 'class', 'interface', 'component', 'module', 'package',
    'deployment', 'server', 'client', 'backend', 'frontend', 'fullstack', 'api',
    'endpoint', 'authentication', 'authorization', 'encryption', 'decryption',
    'blockchain', 'machine', 'learning', 'artificial', 'intelligence', 'neural',
    'network', 'deep', 'learning', 'data', 'science', 'analytics', 'visualization'
  ]
};

const CHARACTERS = {
  lowercase: 'abcdefghijklmnopqrstuvwxyz',
  uppercase: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
  numbers: '0123456789',
  symbols: '!@#$%^&*()_+-=[]{}|;:,.<>?',
  special: '!@#$%^&*'
};

const generateRandomWords = (count, wordList) => {
  const words = [];
  for (let i = 0; i < count; i++) {
    const randomIndex = Math.floor(Math.random() * wordList.length);
    words.push(wordList[randomIndex]);
  }
  return words.join(' ');
};

const generateRandomString = (length, charset) => {
  let result = '';
  for (let i = 0; i < length; i++) {
    result += charset.charAt(Math.floor(Math.random() * charset.length));
  }
  return result;
};

const generatePassword = (length, options) => {
  let charset = '';
  if (options.lowercase) charset += CHARACTERS.lowercase;
  if (options.uppercase) charset += CHARACTERS.uppercase;
  if (options.numbers) charset += CHARACTERS.numbers;
  if (options.symbols) charset += CHARACTERS.symbols;

  if (!charset) charset = CHARACTERS.lowercase + CHARACTERS.uppercase + CHARACTERS.numbers;

  return generateRandomString(length, charset);
};

const generateSentences = (count, wordList, minWords = 5, maxWords = 15) => {
  const sentences = [];
  for (let i = 0; i < count; i++) {
    const wordCount = Math.floor(Math.random() * (maxWords - minWords + 1)) + minWords;
    const words = [];
    for (let j = 0; j < wordCount; j++) {
      const randomIndex = Math.floor(Math.random() * wordList.length);
      words.push(wordList[randomIndex]);
    }
    let sentence = words.join(' ');
    sentence = sentence.charAt(0).toUpperCase() + sentence.slice(1) + '.';
    sentences.push(sentence);
  }
  return sentences.join(' ');
};

const handler = async (req, res) => {
  try {
    const { 
      type = 'words', 
      count = 10, 
      length = 12,
      wordType = 'lorem',
      includeNumbers = true,
      includeUppercase = true,
      includeLowercase = true,
      includeSymbols = false,
      minWords = 5,
      maxWords = 15
    } = req.query;

    const validTypes = ['words', 'sentences', 'paragraphs', 'password', 'string', 'uuid'];
    const validWordTypes = Object.keys(WORD_LISTS);

    if (!validTypes.includes(type)) {
      return res.status(400).json({
        success: false,
        error: `Invalid type. Valid types: ${validTypes.join(', ')}`
      });
    }

    if (!validWordTypes.includes(wordType) && ['words', 'sentences', 'paragraphs'].includes(type)) {
      return res.status(400).json({
        success: false,
        error: `Invalid wordType. Valid wordTypes: ${validWordTypes.join(', ')}`
      });
    }

    let result = '';
    const wordList = WORD_LISTS[wordType] || WORD_LISTS.lorem;

    switch (type) {
      case 'words':
        result = generateRandomWords(parseInt(count), wordList);
        break;

      case 'sentences':
        result = generateSentences(parseInt(count), wordList, parseInt(minWords), parseInt(maxWords));
        break;

      case 'paragraphs':
        const paragraphs = [];
        for (let i = 0; i < parseInt(count); i++) {
          const sentenceCount = Math.floor(Math.random() * 6) + 3;
          paragraphs.push(generateSentences(sentenceCount, wordList, parseInt(minWords), parseInt(maxWords)));
        }
        result = paragraphs.join('\n\n');
        break;

      case 'password':
        const passwordOptions = {
          lowercase: includeLowercase === 'true',
          uppercase: includeUppercase === 'true',
          numbers: includeNumbers === 'true',
          symbols: includeSymbols === 'true'
        };
        result = generatePassword(parseInt(length), passwordOptions);
        break;

      case 'string':
        let charset = '';
        if (includeLowercase === 'true') charset += CHARACTERS.lowercase;
        if (includeUppercase === 'true') charset += CHARACTERS.uppercase;
        if (includeNumbers === 'true') charset += CHARACTERS.numbers;
        if (includeSymbols === 'true') charset += CHARACTERS.symbols;
        if (!charset) charset = CHARACTERS.lowercase + CHARACTERS.numbers;
        result = generateRandomString(parseInt(length), charset);
        break;

      case 'uuid':
        result = crypto.randomUUID();
        break;
    }

    res.json({
      success: true,
      data: {
        type,
        result,
        length: result.length,
        word_count: result.split(' ').length,
        generated_at: new Date().toISOString(),
        parameters: {
          type,
          count: parseInt(count),
          length: parseInt(length),
          wordType,
          includeNumbers: includeNumbers === 'true',
          includeUppercase: includeUppercase === 'true',
          includeLowercase: includeLowercase === 'true',
          includeSymbols: includeSymbols === 'true'
        }
      }
    });

  } catch (error) {
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
};

module.exports = {
  name: 'Random Text Generator',
  description: 'Generate random text, words, sentences, passwords, and UUIDs',
  type: 'GET',
  routes: ['api/tools/random/text'],
  tags: ['utility', 'random', 'generator', 'text'],
  parameters: ['type', 'count', 'length', 'wordType', 'includeNumbers', 'includeUppercase', 'includeLowercase', 'includeSymbols'],
  enabled: true,
  main: ['tools'],
  handler
};