package fileupload

import (
	"context"
	"fmt"
	"io"
	"net/url"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/aws"
	awss3 "github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/google/uuid"
)

type s3 struct {
	endpoint string
}

// load implements Uploader.
func (s *s3) load(filename string) (basename string, modTime time.Time, content io.ReadSeekCloser, err error) {
	panic("unimplemented")
}

// store implements Uploader.
func (s *s3) store(r io.Reader, username string, mimeType string, basename string, contentLength int64) (outFilename string, err error) {
	split := strings.Split(s.endpoint, "/")
	bucket := split[len(split)-1]
	filename := url.PathEscape(username) + "/" + uuid.NewString()

	endpointResolver := aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
		return aws.Endpoint{
			URL: s.endpoint,
		}, nil
	})
	cfg, err := config.LoadDefaultConfig(context.TODO(),
		config.WithEndpointResolverWithOptions(endpointResolver),
		config.WithRegion("auto"),
	)

	s3client := awss3.NewFromConfig(cfg)
	_, err = s3client.PutObject(context.TODO(), &awss3.PutObjectInput{
		Bucket: &bucket,
		Key:    &filename,
		ContentType: &mimeType,
		ContentLength: &contentLength,
		Body:   r,
	})
	if err != nil {
		return "", fmt.Errorf("failed to upload to s3 api: %v", err)
	}
	
	return filename, nil
}