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

const WaterBill = sequelize.define('WaterBill', {
  id: {
    type: DataTypes.INTEGER,
    primaryKey: true,
    autoIncrement: true,
    comment: '水费账单ID'
  },
  roomId: {
    type: DataTypes.INTEGER,
    allowNull: false,
    references: {
      model: Room,
      key: 'id'
    },
    comment: '房间ID'
  },
  startDate: {
    type: DataTypes.DATE,
    allowNull: false,
    comment: '开始日期'
  },
  endDate: {
    type: DataTypes.DATE,
    allowNull: true,
    comment: '结束日期'
  },
  startReading: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    comment: '起始读数'
  },
  endReading: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: true,
    comment: '结束读数'
  },
  usage: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: true,
    comment: '用水量'
  },
  unitPrice: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    comment: '单价'
  },
  amount: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: true,
    comment: '金额'
  },
  status: {
    type: DataTypes.ENUM('unbilled', 'unpaid', 'paid'),
    allowNull: false,
    defaultValue: 'unpaid',
    comment: '状态（unbilled：未出账，unpaid：未支付，paid：已支付）'
  },
  createTime: {
    type: DataTypes.DATE,
    defaultValue: DataTypes.NOW,
    comment: '创建时间'
  },
  updateTime: {
    type: DataTypes.DATE,
    defaultValue: DataTypes.NOW,
    onUpdate: DataTypes.NOW,
    comment: '更新时间'
  },
  isDeleted: {
    type: DataTypes.INTEGER,
    allowNull: false,
    defaultValue: 0,
    comment: '删除状态（0：未删除，1：已删除）'
  }
}, {
  tableName: 'water_bills',
  timestamps: false
});

// 建立关联
WaterBill.belongsTo(Room, { foreignKey: 'roomId' });

module.exports = WaterBill;