feat: initial commit

apps/api/src/modules/pricing/pricing.controller.ts

@@ -0,0 +1,12 @@
+import { Controller, Get, Query } from '@nestjs/common';
+import { PricingService } from './pricing.service';
+
+@Controller('pricing')
+export class PricingController {
+  constructor(private readonly pricing: PricingService) {}
+
+  @Get('latest')
+  getLatest(@Query('karatPerMille') karatPerMille: string) {
+    return this.pricing.getLatestQuote(Number(karatPerMille) || 750);
+  }
+}

apps/api/src/modules/pricing/pricing.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { PricingService } from './pricing.service';
+import { PricingController } from './pricing.controller';
+
+@Module({
+  controllers: [PricingController],
+  providers: [PricingService],
+  exports: [PricingService],
+})
+export class PricingModule {}

apps/api/src/modules/pricing/pricing.service.ts

@@ -0,0 +1,23 @@
+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;
+  }
+}