const mongoose = require('mongoose');

const approvalSchema = new mongoose.Schema({
  approvalId: { type: String, required: true, unique: true },
  type: { type: String, enum: ['订单退款', '车辆报废', '押金退还', '价格修改', '其他'], required: true },
  title: { type: String, required: true },
  content: { type: String },
  applicant: { type: String },
  approver: { type: String },
  status: { type: String, enum: ['待审批', '已通过', '已拒绝'], default: '待审批' },
  remark: { type: String },
  createdAt: { type: Date, default: Date.now },
  updatedAt: { type: Date, default: Date.now }
});

approvalSchema.pre('save', function(next) {
  if (!this.approvalId) {
    this.approvalId = `APPR${Date.now()}`;
  }
  this.updatedAt = new Date();
  next();
});

module.exports = mongoose.model('Approval', approvalSchema);