import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import {
  S3Client,
  S3ClientConfig,
  GetObjectCommand,
  GetObjectCommandInput,
  GetObjectCommandOutput,
  NoSuchKey,
} from '@aws-sdk/client-s3';

@Injectable()
export class AppService {
  private readonly s3Client: S3Client;

  constructor(private readonly configService: ConfigService) {
    this.s3Client = new S3Client({
      region: 'us-west-1',
      endpoint: this.configService.get<string>('MINIO_ENDPOINT'),
      credentials: {
        accessKeyId: this.configService.get<string>('MINIO_ACCESSKEY'),
        secretAccessKey: this.configService.get<string>('MINIO_SECRETKEY'),
      },
      forcePathStyle: true,
    } as S3ClientConfig);
  }

  getHealthz(): string {
    return 'OK';
  }

  async getObject(
    getObjectConfig: GetObjectCommandInput,
  ): Promise<GetObjectCommandOutput | null> {
    const command = new GetObjectCommand(getObjectConfig);
    try {
      return await this.s3Client.send(command);
    } catch (err: unknown) {
      if (err instanceof NoSuchKey) return null;
      throw err;
    }
  }
}