/*
Copyright 2020 KubeSphere Authors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package s3

import (
	"code.cloudfoundry.org/bytefmt"
	"fmt"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/s3"
	"github.com/aws/aws-sdk-go/service/s3/s3manager"
	"io"
	"k8s.io/klog"
	"time"
)

type Client struct {
	s3Client  *s3.S3
	s3Session *session.Session
	bucket    string
}

func (s *Client) Upload(key, fileName string, body io.Reader) error {
	uploader := s3manager.NewUploader(s.s3Session, func(uploader *s3manager.Uploader) {
		uploader.PartSize = 5 * bytefmt.MEGABYTE
		uploader.LeavePartsOnError = true
	})
	_, err := uploader.Upload(&s3manager.UploadInput{
		Bucket:             aws.String(s.bucket),
		Key:                aws.String(key),
		Body:               body,
		ContentDisposition: aws.String(fmt.Sprintf("attachment; filename=\"%s\"", fileName)),
	})
	return err
}

func (s *Client) GetDownloadURL(key string, fileName string) (string, error) {
	req, _ := s.s3Client.GetObjectRequest(&s3.GetObjectInput{
		Bucket:                     aws.String(s.bucket),
		Key:                        aws.String(key),
		ResponseContentDisposition: aws.String(fmt.Sprintf("attachment; filename=\"%s\"", fileName)),
	})
	return req.Presign(5 * time.Minute)
}

func (s *Client) Delete(key string) error {
	_, err := s.s3Client.DeleteObject(
		&s3.DeleteObjectInput{Bucket: aws.String(s.bucket),
			Key: aws.String(key),
		})
	if err != nil {
		return err
	}
	return nil
}

func NewS3Client(options *Options) (Interface, error) {
	cred := credentials.NewStaticCredentials(options.AccessKeyID, options.SecretAccessKey, options.SessionToken)

	config := aws.Config{
		Region:           aws.String(options.Region),
		Endpoint:         aws.String(options.Endpoint),
		DisableSSL:       aws.Bool(options.DisableSSL),
		S3ForcePathStyle: aws.Bool(options.ForcePathStyle),
		Credentials:      cred,
	}

	s, err := session.NewSession(&config)
	if err != nil {
		klog.Error(err)
		return nil, err
	}

	var c Client

	c.s3Client = s3.New(s)
	c.s3Session = s
	c.bucket = options.Bucket

	return &c, nil
}

func (s *Client) Client() *s3.S3 {
	return s.s3Client
}
func (s *Client) Session() *session.Session {
	return s.s3Session
}

func (s *Client) Bucket() *string {
	return aws.String(s.bucket)
}
