package obs

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"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/factory/reg"
	s3stg "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/s3"
	stgtypes "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/types"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"
)

func init() {
	reg.RegisterBuilder[*jcstypes.OBSType](newBuilder)
}

type builder struct {
	stgtypes.EmptyBuilder
	detail *jcstypes.UserSpaceDetail
}

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

func (b *builder) FeatureDesc() stgtypes.FeatureDesc {
	return stgtypes.FeatureDesc{}
}

func (b *builder) CreateShardStore(typeOnly bool) (stgtypes.ShardStore, error) {
	stgType := b.detail.UserSpace.Storage.(*jcstypes.OBSType)
	cred, ok := b.detail.UserSpace.Credential.(*jcstypes.OBSCred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for obs storage", b.detail.UserSpace.Credential)
	}

	if typeOnly {
		return (*ShardStore)(nil), nil
	}

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

	return NewShardStore(b.detail, stgType, cred, cli, bucket)
}

func (b *builder) CreateBaseStore(typeOnly bool) (stgtypes.BaseStore, error) {
	stgType := b.detail.UserSpace.Storage.(*jcstypes.OBSType)
	cred, ok := b.detail.UserSpace.Credential.(*jcstypes.OBSCred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for obs storage", b.detail.UserSpace.Credential)
	}

	if typeOnly {
		return (*s3stg.BaseStore)(nil), nil
	}

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

	return s3stg.NewBaseStore(b.detail, cli, bucket, s3stg.BaseStoreOption{UseAWSSha256: false})
}

func createClient(stgType *jcstypes.OBSType, cred *jcstypes.OBSCred) (*s3.Client, string, error) {
	awsConfig := aws.Config{}

	cre := aws.Credentials{
		AccessKeyID:     cred.AK,
		SecretAccessKey: cred.SK,
	}
	awsConfig.Credentials = &credentials.StaticCredentialsProvider{Value: cre}
	awsConfig.Region = stgType.Region
	awsConfig.RetryMaxAttempts = 1

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

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

func (b *builder) CreateMultiparter(typeOnly bool) (stgtypes.Multiparter, error) {
	stgType := b.detail.UserSpace.Storage.(*jcstypes.OBSType)
	feat := stgtypes.FindFeature[*jcstypes.MultipartUploadFeature](b.detail)
	if feat == nil {
		return nil, fmt.Errorf("feature %T not found", jcstypes.MultipartUploadFeature{})
	}

	if typeOnly {
		return (*s3stg.Multiparter)(nil), nil
	}

	cred, ok := b.detail.UserSpace.Credential.(*jcstypes.OBSCred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for obs storage", b.detail.UserSpace.Credential)
	}

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

	return s3stg.NewMultiparter(
		b.detail,
		feat,
		bucket,
		cli,
	), nil
}

func (b *builder) CreateS2STransfer(typeOnly bool) (stgtypes.S2STransfer, error) {
	stgType := b.detail.UserSpace.Storage.(*jcstypes.OBSType)
	feat := stgtypes.FindFeature[*jcstypes.S2STransferFeature](b.detail)
	if feat == nil {
		return nil, fmt.Errorf("feature %T not found", jcstypes.S2STransferFeature{})
	}

	if typeOnly {
		return (*S2STransfer)(nil), nil
	}

	cred, ok := b.detail.UserSpace.Credential.(*jcstypes.OBSCred)
	if !ok {
		return nil, fmt.Errorf("invalid storage credential type %T for obs storage", b.detail.UserSpace.Credential)
	}

	return NewS2STransfer(b.detail, stgType, cred, feat), nil
}