import {
  Entity,
  PrimaryGeneratedColumn,
  Column,
  CreateDateColumn,
  ManyToOne,
  JoinColumn,
  OneToMany,
} from 'typeorm';
import { Student } from './student.entity';
import { BillItem } from './bill-item.entity';

@Entity('bills')
export class Bill {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ name: 'student_id' })
  studentId: number;

  @Column({ name: 'period_start', type: 'date' })
  periodStart: string;

  @Column({ name: 'period_end', type: 'date' })
  periodEnd: string;

  @Column({ name: 'shared_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
  sharedAmount: number;

  @Column({ name: 'personal_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
  personalAmount: number;

  @Column({ name: 'total_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
  totalAmount: number;

  @Column({ type: 'varchar', length: 30, default: 'batch' })
  source: 'batch' | 'student_utility';

  @Column({ name: 'paid_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
  paidAmount: number;

  @Column({ name: 'outstanding_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
  outstandingAmount: number;

  @Column({ type: 'varchar', length: 20, default: 'unpaid' })
  status: string;

  @Column({ name: 'cancelled_at', type: 'datetime', nullable: true })
  cancelledAt: Date | null;

  @Column({ name: 'cancel_reason', type: 'varchar', length: 300, nullable: true })
  cancelReason: string | null;

  @CreateDateColumn({ name: 'generated_at' })
  generatedAt: Date;

  @ManyToOne(() => Student, (s) => s.bills)
  @JoinColumn({ name: 'student_id' })
  student: Student;

  @OneToMany(() => BillItem, (bi) => bi.bill)
  items: BillItem[];

}