import { Injectable, NotFoundException } from '@nestjs/common';
import { PrismaService } from '../../common/prisma.service';

@Injectable()
export class WalletService {
  constructor(private prisma: PrismaService) {}

  async getWallet(passengerId: string) {
    const wallet = await this.prisma.walletAccount.findUnique({ where: { passengerId }, include: { ledger: { orderBy: { createdAt: 'desc' }, take: 20 } } });
    if (!wallet) throw new NotFoundException('Wallet not found');
    return wallet;
  }

  async topUp(passengerId: string, amountMinor: number, description = 'Top-up') {
    const wallet = await this.prisma.walletAccount.findUnique({ where: { passengerId } });
    if (!wallet) throw new NotFoundException('Wallet not found');
    const newBalance = wallet.balanceMinor + amountMinor;
    await this.prisma.walletAccount.update({ where: { passengerId }, data: { balanceMinor: newBalance } });
    return this.prisma.walletLedgerEntry.create({ data: { walletId: wallet.id, type: 'CREDIT', amountMinor, balanceAfterMinor: newBalance, description } });
  }
}