backend/src/entities/order.entity.ts

import {
  Entity,
  Column,
  PrimaryGeneratedColumn,
  CreateDateColumn,
  ManyToOne,
  JoinColumn,
  OneToMany,
} from 'typeorm';
import { User } from './user.entity';
import { Course } from './course.entity';
import { Payment } from './payment.entity';

export enum OrderStatus {
  PENDING = 'pending',
  PAID = 'paid',
  CANCELLED = 'cancelled',
  REFUNDED = 'refunded',
}

export enum OrderType {
  PURCHASE = 'purchase',
  DONATION = 'donation',
  VIP = 'vip',
}

@Entity('orders')
export class Order {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ type: 'varchar', length: 32, unique: true, name: 'order_no' })
  orderNo: string;

  @Column({ name: 'user_id' })
  userId: number;

  @Column({ name: 'course_id', nullable: true })
  courseId: number;

  @Column({ type: 'decimal', precision: 10, scale: 2 })
  amount: number;

  @Column({ type: 'varchar', default: OrderStatus.PENDING })
  status: OrderStatus;

  @Column({ type: 'varchar', default: OrderType.PURCHASE, name: 'order_type' })
  orderType: OrderType;

  @Column({ type: 'varchar', length: 255, nullable: true })
  message: string;

  @CreateDateColumn({ name: 'created_at' })
  createdAt: Date;

  @Column({ type: 'datetime', nullable: true, name: 'paid_at' })
  paidAt: Date;

  @ManyToOne(() => User, (user) => user.orders)
  @JoinColumn({ name: 'user_id' })
  user: User;

  @ManyToOne(() => Course, (course) => course.orders)
  @JoinColumn({ name: 'course_id' })
  course: Course;

  @OneToMany(() => Payment, (payment) => payment.order)
  payments: Payment[];
}