Updated seat class and coach mangement

apps/edr-passenger-api/src/modules/seat-classes/seat-classes.service.ts

@@ -0,0 +1,40 @@
+import { Injectable, NotFoundException, ConflictException } from '@nestjs/common';
+import { PrismaService } from '../../common/prisma.service';
+import { CreateSeatClassDto, UpdateSeatClassDto } from './seat-classes.dto';
+
+@Injectable()
+export class SeatClassesService {
+  constructor(private prisma: PrismaService) {}
+
+  private readonly coachInclude = {
+    coaches: {
+      select: { id: true, label: true, tripId: true, _count: { select: { seats: true } } },
+      orderBy: { label: 'asc' as const },
+    },
+  };
+
+  listSeatClasses() {
+    return this.prisma.seatClass.findMany({ orderBy: { createdAt: 'asc' }, include: this.coachInclude });
+  }
+
+  async getSeatClass(id: string) {
+    const sc = await this.prisma.seatClass.findUnique({ where: { id }, include: this.coachInclude });
+    if (!sc) throw new NotFoundException('SeatClass not found');
+    return sc;
+  }
+
+  async createSeatClass(dto: CreateSeatClassDto) {
+    try {
+      return await this.prisma.seatClass.create({ data: dto });
+    } catch (e: any) {
+      if (e.code === 'P2002') throw new ConflictException(`Seat class "${dto.name}" already exists`);
+      throw e;
+    }
+  }
+
+  async updateSeatClass(id: string, dto: UpdateSeatClassDto) {
+    const sc = await this.prisma.seatClass.findUnique({ where: { id } });
+    if (!sc) throw new NotFoundException('SeatClass not found');
+    return this.prisma.seatClass.update({ where: { id }, data: dto, include: this.coachInclude });
+  }
+}