file service module added

src/file/file.service.ts

@@ -0,0 +1,53 @@
+// src/file/file.service.ts
+import { Injectable, Inject } from '@nestjs/common';
+import { PrismaService } from 'src/prisma/prisma.service';
+import type { IStorageProvider } from './storage-providers/storage-provider.interface';
+
+@Injectable()
+export class FileService {
+  constructor(
+    private prisma: PrismaService,
+
+    @Inject('StorageProvider')
+    private readonly storageProvider: IStorageProvider,
+  ) {}
+
+  async uploadFile(file: any, folder: string) {
+    const lastVersion = await this.prisma.file.findFirst({
+      where: { folder, originalName: file.originalname },
+      orderBy: { version: 'desc' },
+    });
+
+    const nextVersion = lastVersion ? lastVersion.version + 1 : 1;
+
+    const storagePath = await this.storageProvider.upload(file, folder);
+
+    return this.prisma.file.create({
+      data: {
+        originalName: file.originalname,
+        storagePath,
+        folder,
+        mimeType: file.mimetype,
+        size: file.size,
+        version: nextVersion,
+      },
+    });
+  }
+
+  async deleteFile(id: string) {
+    const file = await this.prisma.file.findUnique({ where: { id } });
+
+    if (!file) return;
+
+    await this.storageProvider.delete(file.storagePath);
+
+    await this.prisma.file.delete({ where: { id } });
+  }
+
+  async getFileVersions(originalName: string, folder: string) {
+    return this.prisma.file.findMany({
+      where: { folder, originalName },
+      orderBy: { version: 'asc' },
+    });
+  }
+}