package s3

import (
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/credentials"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	clitypes "gitlink.org.cn/cloudream/storage2/client/types"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/storage/factory/reg"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/storage/types"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/storage/utils"
	cortypes "gitlink.org.cn/cloudream/storage2/coordinator/types"
)

func init() {
	reg.RegisterBuilder[*cortypes.S3Type](newBuilder)
}

type builder struct {
	types.EmptyBuilder
	detail *clitypes.UserSpaceDetail
}

func newBuilder(detail *clitypes.UserSpaceDetail) types.StorageBuilder {
	return &builder{
		detail: detail,
	}
}

func (b *builder) FeatureDesc() types.FeatureDesc {
	return types.FeatureDesc{
		HasBypassWrite:    true,
		HasBypassRead:     true,
		HasBypassHTTPRead: false,
	}
}

func (b *builder) CreateShardStore() (types.ShardStore, error) {
	s3Cred, ok := b.detail.UserSpace.Credential.(*cortypes.S3Cred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for s3 storage", b.detail.UserSpace.Credential)
	}

	cli, bkt, err := createClient(s3Cred)
	if err != nil {
		return nil, err
	}

	return NewShardStore(b.detail, cli, bkt, ShardStoreOption{UseAWSSha256: true})
}

func (b *builder) CreatePublicStore() (types.PublicStore, error) {
	s3Cred, ok := b.detail.UserSpace.Credential.(*cortypes.S3Cred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for s3 storage", b.detail.UserSpace.Credential)
	}

	cli, bkt, err := createClient(s3Cred)
	if err != nil {
		return nil, err
	}

	return NewPublicStore(b.detail, cli, bkt)
}

func createClient(cred *cortypes.S3Cred) (*s3.Client, string, error) {
	awsConfig := aws.Config{}

	if cred.AK != "" && cred.SK != "" {
		cre := aws.Credentials{
			AccessKeyID:     cred.AK,
			SecretAccessKey: cred.SK,
		}
		awsConfig.Credentials = &credentials.StaticCredentialsProvider{Value: cre}
	}

	awsConfig.Region = cred.Region

	options := []func(*s3.Options){}
	options = append(options, func(s3Opt *s3.Options) {
		s3Opt.BaseEndpoint = &cred.Endpoint
	})

	cli := s3.NewFromConfig(awsConfig, options...)
	return cli, cred.Bucket, nil
}

func (b *builder) CreateMultiparter() (types.Multiparter, error) {
	feat := utils.FindFeature[*cortypes.MultipartUploadFeature](b.detail.Storage)
	if feat == nil {
		return nil, fmt.Errorf("feature %T not found", cortypes.MultipartUploadFeature{})
	}

	s3Cred, ok := b.detail.UserSpace.Credential.(*cortypes.S3Cred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for s3 public store", b.detail.UserSpace.Credential)
	}

	cli, bucket, err := createClient(s3Cred)
	if err != nil {
		return nil, err
	}

	return NewMultiparter(
		b.detail,
		feat,
		bucket,
		cli,
	), nil
}