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

const Subject = sequelize.define('subjects', {
  id: { type: DataTypes.UUID, defaultValue: DataTypes.UUIDV4, primaryKey: true },
  subject_code: { type: DataTypes.STRING(20), unique: true, allowNull: false },
  subject_name: { type: DataTypes.STRING(100), allowNull: false },
  subject_name_en: { type: DataTypes.STRING(100) },
  description: { type: DataTypes.TEXT },
  is_active: { type: DataTypes.BOOLEAN, defaultValue: true },
  is_premium: { type: DataTypes.BOOLEAN, defaultValue: false, comment: 'Nội dung premium' },
  is_training: { type: DataTypes.BOOLEAN, defaultValue: false, comment: 'Nội dung đào tạo nhân sự' },
  is_public: { type: DataTypes.BOOLEAN, defaultValue: false, comment: 'Nội dung tự học công khai' },
  required_role: { type: DataTypes.STRING(50), comment: 'Role yêu cầu' },
  min_subscription_tier: { type: DataTypes.STRING(50), comment: 'Gói tối thiểu: basic, premium, vip' },
  created_at: { type: DataTypes.DATE, allowNull: false, defaultValue: DataTypes.NOW },
  updated_at: { type: DataTypes.DATE, allowNull: false, defaultValue: DataTypes.NOW },
}, {
  tableName: 'subjects',
  timestamps: true,
  underscored: true,
  indexes: [
    { fields: ['is_premium'] },
    { fields: ['is_training'] },
    { fields: ['is_public'] },
  ],
});

module.exports = Subject;