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

const Bill = sequelize.define('Bill', {
  id: {
    type: DataTypes.INTEGER,
    primaryKey: true,
    autoIncrement: true,
    comment: '账单ID'
  },
  billNo: {
    type: DataTypes.STRING(50),
    allowNull: false,
    unique: true,
    comment: '账单编号'
  },
  roomId: {
    type: DataTypes.INTEGER,
    allowNull: true,
    references: {
      model: Room,
      key: 'id'
    },
    comment: '房间ID（可选）'
  },
  renterId: {
    type: DataTypes.INTEGER,
    allowNull: true,
    references: {
      model: Renter,
      key: 'id'
    },
    comment: '租客ID（可选）'
  },
  rentalId: {
    type: DataTypes.INTEGER,
    allowNull: true,
    references: {
      model: Rental,
      key: 'id'
    },
    comment: '租赁ID（可选）'
  },
  type: {
    type: DataTypes.ENUM('income', 'expense'),
    allowNull: false,
    comment: '账单类型（income：收入，expense：支出）'
  },
  category: {
    type: DataTypes.STRING(50),
    allowNull: false,
    comment: '分类（rent-租金, water-水费, electricity-电费, gas-燃气费, deposit-押金, maintenance-维修费, property_fee-物业费, agency_fee-中介费, penalty-违约金, other_income-其他收入, other_expense-其他支出）'
  },
  receivableAmount: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    comment: '应收金额'
  },
  receivedAmount: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    defaultValue: 0,
    comment: '已收金额'
  },
  status: {
    type: DataTypes.ENUM('unpaid', 'partial', 'paid', 'cancelled'),
    allowNull: false,
    defaultValue: 'unpaid',
    comment: '状态（unpaid-未收, partial-部分收款, paid-已收清, cancelled-已取消）'
  },
  billMonth: {
    type: DataTypes.STRING(7),
    allowNull: true,
    comment: '账单月份（格式：YYYY-MM）'
  },
  billDate: {
    type: DataTypes.DATEONLY,
    allowNull: false,
    comment: '账单日期'
  },
  sourceType: {
    type: DataTypes.STRING(50),
    allowNull: true,
    comment: '来源类型（meter_reading-抄表记录）'
  },
  sourceId: {
    type: DataTypes.INTEGER,
    allowNull: true,
    comment: '来源ID'
  },
  paymentMethod: {
    type: DataTypes.STRING(50),
    allowNull: true,
    comment: '支付方式（cash-现金, bank_transfer-银行转账, alipay-支付宝, wechat-微信支付）'
  },
  remark: {
    type: DataTypes.TEXT,
    allowNull: true,
    comment: '备注'
  },
  createBy: {
    type: DataTypes.INTEGER,
    allowNull: true,
    comment: '创建人ID'
  },
  createTime: {
    type: DataTypes.DATE,
    defaultValue: DataTypes.NOW,
    comment: '创建时间'
  },
  updateBy: {
    type: DataTypes.INTEGER,
    allowNull: true,
    comment: '修改人ID'
  },
  updateTime: {
    type: DataTypes.DATE,
    defaultValue: DataTypes.NOW,
    onUpdate: DataTypes.NOW,
    comment: '更新时间'
  },
  tenantId: {
    type: DataTypes.INTEGER,
    allowNull: false,
    comment: '租户ID'
  },
  isDeleted: {
    type: DataTypes.INTEGER,
    allowNull: false,
    defaultValue: 0,
    comment: '删除状态（0：未删除，1：已删除）'
  }
}, {
  tableName: 'bills',
  timestamps: false
});

// 建立关联
Bill.belongsTo(Room, { foreignKey: 'roomId' });
Bill.belongsTo(Renter, { foreignKey: 'renterId' });
Bill.belongsTo(Rental, { foreignKey: 'rentalId' });

module.exports = Bill;