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

const VocabForm = sequelize.define('VocabForm', {
    form_id: {
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
      primaryKey: true,
      comment: 'Unique identifier for word form'
    },
    vocab_id: {
      type: DataTypes.UUID,
      allowNull: false,
      references: {
        model: 'vocab',
        key: 'vocab_id'
      },
      onDelete: 'CASCADE',
      comment: 'Reference to vocabulary entry'
    },
    form_key: {
      type: DataTypes.STRING(50),
      allowNull: false,
      comment: 'Form identifier (v1, v2, v3, v_s_es, v_ing, etc.)'
    },
    text: {
      type: DataTypes.STRING(100),
      allowNull: false,
      comment: 'The actual word form (e.g., eat, eats, eating, ate)'
    },
    phonetic: {
      type: DataTypes.STRING(100),
      comment: 'IPA phonetic transcription (e.g., /iːt/)'
    },
    audio_url: {
      type: DataTypes.STRING(500),
      comment: 'URL to audio pronunciation file'
    },
    min_grade: {
      type: DataTypes.INTEGER,
      defaultValue: 1,
      comment: 'Minimum grade level to unlock this form'
    },
    description: {
      type: DataTypes.TEXT,
      comment: 'Description or usage note for this form'
    },
    created_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    },
    updated_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    }
  }, {
    tableName: 'vocab_form',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
    indexes: [
      {
        name: 'idx_vocab_form_vocab',
        fields: ['vocab_id']
      },
      {
        name: 'idx_vocab_form_key',
        fields: ['form_key']
      },
      {
        name: 'idx_vocab_form_unique',
        unique: true,
        fields: ['vocab_id', 'form_key']
      }
    ]
  });

module.exports = VocabForm;