const { DataTypes } = require('sequelize');
const { sequelize } = require('../config/database');

const Vocab = sequelize.define('Vocab', {
    vocab_id: {
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
      primaryKey: true,
      comment: 'Unique identifier for vocabulary entry'
    },
    // Từ thực tế (wash, washes, washing, ate, eaten...)
    text: { 
      type: DataTypes.STRING(100), 
      allowNull: false, 
      index: true 
    },
    // Từ gốc để nhóm lại (wash, eat...)
    base_word: { 
      type: DataTypes.STRING(100), 
      allowNull: false, 
      index: true 
    },
    // Đã xuất hiện trong khối nào, bài học nào, lesson nào
    // Ví dụ 111 là grade 1, unit 1, lesson 1
    location: {
      type: DataTypes.INTEGER,
      defaultValue: 100,
      comment: 'It is number of gradeX100 + unitX10 + lesson (e.g., Grade 1 Unit 2 Lesson 3 = 123)'
    },
    // Loại biến thể (V1, V2, V3, V_ing, Noun_Form...)
    form_key: { 
      type: DataTypes.STRING(20), 
      defaultValue: 'base' 
    },
    // Nội dung dùng chung (có thể lưu JSON để dễ quản lý hoặc dùng chung cho cả group)
    translation: {
      type: DataTypes.STRING(200)
    },
    difficulty_score: {
      type: DataTypes.INTEGER,
      defaultValue: 1,
      comment: 'Difficulty level (1-10)'
    },
    category: {
      type: DataTypes.STRING(100),
      comment: 'Category of the word (e.g., Action Verbs, Nouns)'
    },
    topic: {
      type: DataTypes.STRING(100),
      comment: 'Topic of the word (e.g., Food, Travel, Education)'
    },
    images: {
      type: DataTypes.JSON,
      comment: 'Array of image URLs'
    },
    tags: {
      type: DataTypes.JSON,
      comment: 'Array of tags for categorization'
    },
    syntax: {
      type: DataTypes.JSON,
      comment: 'Syntax roles for Grammar Engine (is_subject, is_verb, is_object, is_be, is_adj, is_adv, is_article, verb_type, article_type, adv_type, position, priority, etc.)'
    },
    semantics: {
      type: DataTypes.JSON,
      comment: 'Semantic constraints (can_be_subject_type, can_take_object_type, can_modify, cannot_modify, word_type, is_countable, person_type, etc.)'
    },
    constraints: {
      type: DataTypes.JSON,
      comment: 'Grammar constraints (followed_by, match_subject, match_with, phonetic_rules, etc.)'
    },
    is_active: {
      type: DataTypes.BOOLEAN,
      defaultValue: true,
      comment: 'Whether this vocab entry is active'
    },
    created_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    },
    updated_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    }
  }, {
    tableName: 'vocab',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
    indexes: [
      {
        name: 'idx_vocab_text',
        fields: ['text']
      },
      {
        name: 'idx_base_word',
        fields: ['base_word']
      },
      {
        name: 'idx_category',
        fields: ['category']
      },
      {
        name: 'idx_location',
        fields: ['location']
      }
    ]
  });

module.exports = Vocab;