import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
import type { Relation } from 'typeorm';
import { Category } from './Category.js';
import { User } from './User.js';
import { decimalTransformer } from '../utils/decimal.js';
import { dateTimeColumnType } from '../utils/db-column-types.js';

export type RecurringFrequency = 'WEEKLY' | 'MONTHLY' | 'YEARLY';

@Entity('recurring_expenses')
export class RecurringExpense {
  @PrimaryGeneratedColumn('uuid')
  id!: string;

  @Column({ type: 'varchar', length: 140 })
  title!: string;

  @Column({ type: 'text', nullable: true })
  description!: string | null;

  @Column({ type: 'decimal', precision: 12, scale: 2, transformer: decimalTransformer })
  amount!: number;

  @Column({ type: 'varchar', length: 80, nullable: true })
  merchant!: string | null;

  @Column({ type: 'varchar', length: 50, nullable: true })
  paymentMethod!: string | null;

  @Column({ type: 'varchar', length: 12, default: 'PLN' })
  currency!: string;

  @Column({ type: 'varchar', length: 20, default: 'MONTHLY' })
  frequency!: RecurringFrequency;

  @Column({ type: 'int', default: 1 })
  intervalValue!: number;

  @Column({ type: 'date' })
  startDate!: string;

  @Column({ type: 'date' })
  nextRunDate!: string;

  @Column({ type: 'date', nullable: true })
  lastRunDate!: string | null;

  @Column({ type: 'date', nullable: true })
  endDate!: string | null;

  @Column({ type: 'int', nullable: true })
  maxOccurrences!: number | null;

  @Column({ type: 'int', default: 0 })
  generatedCount!: number;

  @Column({ type: 'varchar', length: 20, default: 'PENDING' })
  defaultStatus!: string;

  @Column({ type: 'simple-json', nullable: true })
  tags!: string[] | null;

  @Column({ type: 'simple-json', nullable: true })
  customFields!: Record<string, string> | null;

  @Column({ type: 'boolean', default: true })
  isActive!: boolean;

  @CreateDateColumn({ type: dateTimeColumnType })
  createdAt!: Date;

  @UpdateDateColumn({ type: dateTimeColumnType })
  updatedAt!: Date;

  @ManyToOne(() => User, { onDelete: 'CASCADE' })
  user!: Relation<User>;

  @ManyToOne(() => Category, { eager: true, onDelete: 'RESTRICT' })
  category!: Relation<Category>;
}