AI-Bill/apps/backend/src/models/budget.model.ts

import mongoose, { type InferSchemaType } from 'mongoose';

const budgetSchema = new mongoose.Schema(
  {
    category: { type: String, required: true },
    amount: { type: Number, required: true, min: 0 },
    currency: { type: String, default: 'CNY' },
    period: { type: String, enum: ['monthly', 'weekly'], default: 'monthly' },
    threshold: { type: Number, min: 0, max: 1, default: 0.8 },
    usage: { type: Number, min: 0, default: 0 },
    userId: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true }
  },
  { timestamps: true }
);

export type BudgetDocument = InferSchemaType<typeof budgetSchema>;

export const BudgetModel = mongoose.models.Budget ?? mongoose.model('Budget', budgetSchema);