package main

import (
	"bytes"
	"context"
	"io"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/s3"
)

var s3Client *s3.Client

func initS3() error {
	cfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion("us-east-1"))
	if err != nil {
		return err
	}
	s3Client = s3.NewFromConfig(cfg)
	return nil
}

// s3Download fetches an object from S3.
func s3Download(ctx context.Context, bucket, key string) ([]byte, error) {
	resp, err := s3Client.GetObject(ctx, &s3.GetObjectInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
	})
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	return io.ReadAll(resp.Body)
}

// s3UploadBundle uploads a bundle JSON to S3.
func s3UploadBundle(ctx context.Context, bucket, key string, data []byte) error {
	_, err := s3Client.PutObject(ctx, &s3.PutObjectInput{
		Bucket:      aws.String(bucket),
		Key:         aws.String(key),
		Body:        bytes.NewReader(data),
		ContentType: aws.String("application/json"),
	})
	return err
}