/**
 * Sensitive Words Dictionary
 * Provides sensitive word lists for content security filtering.
 * This is the server-side master word list that gets served to clients.
 *
 * Categories:
 * - politics: Politically harmful content
 * - pornography: Pornographic and obscene content
 * - gambling: Gambling and illegal betting content
 * - violence: Violent and threatening content
 * - abuse: Abusive and insulting language
 * - fraud: Fraud and scam content
 * - other: Other regulated content
 */

const SENSITIVE_WORDS = {
  politics: [
    // Politically sensitive terms (representative samples)
    '颠覆国家', '推翻政权', '分裂国家', '恐怖组织', '极端主义',
    '反动', '暴乱', '煽动颠覆', '分裂势力', '恐怖袭击',
    '邪教组织', '法轮', '法轮功', '台独', '藏独', '疆独',
  ],

  pornography: [
    // Pornographic and obscene terms (representative samples)
    '色情', '淫秽', '裸体', '性交', '卖淫',
    '嫖娼', '成人电影', '情色', '黄色视频', '一夜情',
    '援交', '约炮', '色诱', '露点', '性服务',
  ],

  gambling: [
    // Gambling related terms (representative samples)
    '赌博', '赌场', '下注', '赌资', '博彩',
    '六合彩', '时时彩', '赌球', '网络赌', '百家乐',
    '老虎机', '扑克赌', '赌狗', '开盘下注', '庄家赔率',
  ],

  violence: [
    // Violence related terms (representative samples)
    '杀人', '砍人', '捅死', '爆炸装置', '自制炸弹',
    '灭门', '血腥屠杀', '残忍杀害', '暴力袭击', '砍杀',
  ],

  abuse: [
    // Abusive language (representative samples)
    '傻逼', '操你', '妈的', '去死', '废物',
    '滚蛋', '贱人', '狗日的', '草泥马', '脑残',
    '白痴', '弱智', '猪头', '王八蛋', '混蛋',
  ],

  fraud: [
    // Fraud and scam terms (representative samples)
    '代开发票', '虚假投资', '传销', '诈骗', '骗钱',
    '刷单', '套现', '洗钱', '假币', '传销组织',
  ],

  other: [
    // Other regulated terms
    '代孕', '买卖器官', '毒品', '吸毒', '走私',
    '枪支', '管制刀具', '假药', '违禁品',
  ],
};

/**
 * Get all sensitive words as a flat array.
 * @returns {string[]}
 */
function getAllWords() {
  return Object.values(SENSITIVE_WORDS).flat();
}

/**
 * Get words grouped by category.
 * @returns {object}
 */
function getWordsByCategory() {
  return { ...SENSITIVE_WORDS };
}

/**
 * Get the total count of words.
 * @returns {number}
 */
function getWordCount() {
  return getAllWords().length;
}

/**
 * Check if a text contains any sensitive words.
 * @param {string} text - Text to check
 * @returns {{ hasViolation: boolean, matchedWords: string[], categories: string[] }}
 */
function checkText(text) {
  if (!text || typeof text !== 'string') {
    return { hasViolation: false, matchedWords: [], categories: [] };
  }

  const matchedWords = [];
  const categories = new Set();
  const lowerText = text.toLowerCase();

  for (const [category, words] of Object.entries(SENSITIVE_WORDS)) {
    for (const word of words) {
      if (lowerText.includes(word.toLowerCase())) {
        matchedWords.push(word);
        categories.add(category);
      }
    }
  }

  return {
    hasViolation: matchedWords.length > 0,
    matchedWords: [...new Set(matchedWords)],
    categories: [...categories],
  };
}

/**
 * Get the version/timestamp of the word list for cache validation.
 * @returns {string}
 */
function getVersion() {
  return '2026-05-11-v1';
}

module.exports = {
  SENSITIVE_WORDS,
  getAllWords,
  getWordsByCategory,
  getWordCount,
  checkText,
  getVersion,
};