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

const Conversation = sequelize.define('Conversation', {
  id: {
    type: DataTypes.UUID,
    defaultValue: DataTypes.UUIDV4,
    primaryKey: true,
  },
  userId: {
    type: DataTypes.UUID,
    allowNull: false,
    references: {
      model: 'users',
      key: 'id',
    },
  },
  assistantId: {
    type: DataTypes.UUID,
    allowNull: false,
    references: {
      model: 'assistants',
      key: 'id',
    },
  },
  title: {
    type: DataTypes.STRING,
    allowNull: true,
  },
  status: {
    type: DataTypes.ENUM('active', 'archived', 'deleted'),
    defaultValue: 'active',
  },
  metadata: {
    type: DataTypes.JSONB,
    defaultValue: {},
  },
  lastMessageAt: {
    type: DataTypes.DATE,
    defaultValue: DataTypes.NOW,
  },
}, {
  tableName: 'conversations',
  timestamps: true,
  indexes: [
    { fields: ['userId'] },
    { fields: ['assistantId'] },
    { fields: ['status'] },
    { fields: ['lastMessageAt'] },
    { fields: ['userId', 'status'] },
  ],
});

module.exports = Conversation;