const Sequelize = require('sequelize');

/**
 * 聊天消息表
 * 每句话一条记录；会话形态（仅 data+job）用 mid=0 存一条
 */
module.exports = (db) => {
  const chat_message = db.define('chat_message', {
    sn_code: {
      comment: '设备SN码',
      type: Sequelize.STRING(50),
      allowNull: false,
      defaultValue: ''
    },
    platform: {
      comment: '平台: boss / liepin',
      type: Sequelize.STRING(20),
      allowNull: false,
      defaultValue: 'boss'
    },
    friendId: {
      comment: '好友/会话ID',
      type: Sequelize.BIGINT,
      allowNull: false
    },
    encryptFriendId: {
      comment: '好友加密ID',
      type: Sequelize.STRING(100),
      allowNull: true,
      defaultValue: ''
    },
    mid: {
      comment: '消息ID（接口返回）',
      type: Sequelize.BIGINT,
      allowNull: false
    },
    message_data: {
      comment: '单条消息原始数据 JSON',
      type: Sequelize.JSON,
      allowNull: true,
      defaultValue: null
    },
    fetch_time: {
      comment: '拉取时间',
      type: Sequelize.DATE,
      allowNull: true,
      defaultValue: Sequelize.NOW
    }
  }, {
    timestamps: false,
    indexes: [
      { unique: true, fields: ['sn_code', 'platform', 'friendId', 'mid'] },
      { unique: false, fields: ['sn_code', 'platform', 'friendId'] },
      { unique: false, fields: ['fetch_time'] }
    ]
  });


  // chat_message.sync({ force: true });

  return chat_message;
};