const mongoose = require('mongoose');

const paymentSchema = new mongoose.Schema({
  paymentId: { type: String, required: true, unique: true },
  // 收支类型：收入（客户付款）/ 支出（退款、工资、房租等）
  type: { 
    type: String, 
    enum: ['收入', '支出'], 
    required: true 
  },
  // 对方名称（谁给钱/我们给谁）
  party: { type: String, required: true },
  // 金额
  amount: { type: Number, required: true },
  // 收支方式
  method: { type: String, enum: ['微信', '支付宝', '银行卡', '现金'] },
  // 分类
  category: { 
    type: String, 
    enum: ['租金收入', '押金退还', '退款', '工资', '房租', '水电', '维修', '其他'] 
  },
  // 备注
  remark: { type: String },
  // 经手人
  operator: { type: String },
  createdAt: { type: Date, default: Date.now },
  updatedAt: { type: Date, default: Date.now }
});

paymentSchema.pre('save', function(next) {
  if (!this.paymentId) {
    this.paymentId = `PAY${Date.now()}`;
  }
  this.updatedAt = new Date();
  next();
});

module.exports = mongoose.model('Payment', paymentSchema);