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

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

  async recordQuote(karatPerMille: number, pricePerGramRial: Prisma.Decimal.Value, source: string) {
    return this.prisma.goldPriceQuote.create({
      data: { karatPerMille, pricePerGramRial, source },
    });
  }

  async getLatestQuote(karatPerMille: number) {
    const quote = await this.prisma.goldPriceQuote.findFirst({
      where: { karatPerMille },
      orderBy: { quotedAt: 'desc' },
    });
    if (!quote) throw new NotFoundException(`No gold price quote recorded for ${karatPerMille}‰`);
    return quote;
  }
}