Fare engine added

apps/edr-passenger-api/src/modules/currency/currency.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, Logger } from '@nestjs/common';
+import { Injectable, Logger, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../../common/prisma.service';
 import { Currency } from '@prisma/client';
 
@@ -47,9 +47,8 @@ export class CurrencyService {
 
   async syncExchangeRates(): Promise<void> {
     this.logger.log('Syncing exchange rates from external provider');
-    
-    // In production, fetch from external API
-    // For now, using static rates
+
+    const today = this.todayUtc();
     const rates = [
       { from: 'ETB', to: 'ETB', rate: 1.0 },
       { from: 'ETB', to: 'DJF', rate: 3.25 },
@@ -59,25 +58,47 @@ export class CurrencyService {
     ];
 
     for (const { from, to, rate } of rates) {
-      await this.prisma.currencyExchangeRate.upsert({
-        where: {
-          fromCurrency_toCurrency_effectiveDate: {
-            fromCurrency: from as Currency,
-            toCurrency: to as Currency,
-            effectiveDate: new Date(),
-          },
-        },
-        update: { rate },
-        create: {
-          fromCurrency: from as Currency,
-          toCurrency: to as Currency,
-          rate,
-          effectiveDate: new Date(),
-          source: 'EXTERNAL_API',
-        },
-      });
+      await this.upsertRate(from as Currency, to as Currency, rate, today, 'EXTERNAL_API');
     }
 
     this.logger.log('Exchange rates synced successfully');
   }
+
+  async listRates() {
+    return this.prisma.currencyExchangeRate.findMany({
+      orderBy: [{ fromCurrency: 'asc' }, { toCurrency: 'asc' }, { effectiveDate: 'desc' }],
+    });
+  }
+
+  async upsertRate(
+    fromCurrency: Currency,
+    toCurrency: Currency,
+    rate: number,
+    effectiveDate?: Date,
+    source = 'MANUAL',
+  ) {
+    const date = effectiveDate ?? this.todayUtc();
+    return this.prisma.currencyExchangeRate.upsert({
+      where: { fromCurrency_toCurrency_effectiveDate: { fromCurrency, toCurrency, effectiveDate: date } },
+      update: { rate, source },
+      create: { fromCurrency, toCurrency, rate, effectiveDate: date, source },
+    });
+  }
+
+  async updateRateById(id: string, rate: number, source = 'MANUAL') {
+    const existing = await this.prisma.currencyExchangeRate.findUnique({ where: { id } });
+    if (!existing) throw new NotFoundException('Exchange rate not found');
+    return this.prisma.currencyExchangeRate.update({ where: { id }, data: { rate, source } });
+  }
+
+  async deleteRate(id: string) {
+    return this.prisma.currencyExchangeRate.delete({ where: { id } });
+  }
+
+  /** Returns midnight UTC for today — used as the date-only key for upserts. */
+  private todayUtc(): Date {
+    const d = new Date();
+    d.setUTCHours(0, 0, 0, 0);
+    return d;
+  }
 }