zod-backend/src/card/dtos/responses/spending-history-item.response.dto.ts

import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import { Transaction } from '~/card/entities/transaction.entity';

export class SpendingHistoryItemDto {
  @ApiProperty({ example: '2025-10-14T09:53:40.000Z' })
  date!: Date;

  @ApiProperty({ example: 50.5 })
  amount!: number;

  @ApiProperty({ example: 'SAR' })
  currency!: string;

  @ApiPropertyOptional({ example: 'Shopping' })
  category!: string | null;

  @ApiPropertyOptional({ example: 'Target Store' })
  merchantName!: string | null;

  @ApiPropertyOptional({ example: 'Riyadh' })
  merchantCity!: string | null;

  @ApiProperty({ example: '277012*****3456' })
  cardMasked!: string;

  @ApiProperty()
  transactionId!: string;

  constructor(transaction: Transaction) {
    this.date = transaction.transactionDate;
    this.amount = transaction.transactionAmount;
    this.currency = transaction.transactionCurrency === '682' ? 'SAR' : transaction.transactionCurrency;
    this.category = this.mapMccToCategory(transaction.merchantCategoryCode);
    this.merchantName = transaction.merchantName;
    this.merchantCity = transaction.merchantCity;
    this.cardMasked = transaction.cardMaskedNumber;
    this.transactionId = transaction.id;
  }

  private mapMccToCategory(mcc: string | null): string {
    if (!mcc) return 'Other';
    
    const mccCode = mcc;
    
    // Map MCC codes to categories
    if (mccCode >= '5200' && mccCode <= '5599') return 'Shopping';
    if (mccCode >= '5800' && mccCode <= '5899') return 'Food & Dining';
    if (mccCode >= '3000' && mccCode <= '3999') return 'Travel';
    if (mccCode >= '4000' && mccCode <= '4799') return 'Transportation';
    if (mccCode >= '7200' && mccCode <= '7999') return 'Entertainment';
    if (mccCode >= '5900' && mccCode <= '5999') return 'Services';
    if (mccCode >= '4800' && mccCode <= '4899') return 'Utilities';
    if (mccCode >= '8000' && mccCode <= '8999') return 'Health & Wellness';
    
    return 'Other';
  }
}