package garage

import (
	"crypto/rand"
	"encoding/hex"
	"errors"
	"fmt"

	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
)

func randStr(l int) string {
	b := make([]byte, l)
	if _, err := rand.Read(b); err != nil {
		panic(err)
	}
	return hex.EncodeToString(b)
}

// IsKeyNotFound returns true if the given error is the result of a key not
// being found in a bucket.
func IsKeyNotFound(err error) bool {
	var mErr minio.ErrorResponse
	return errors.As(err, &mErr) && mErr.Code == "NoSuchKey"
}

// S3APIClient is a client used to interact with garage's S3 API.
type S3APIClient = *minio.Client

// S3APICredentials describe data fields necessary for authenticating with a
// garage S3 API endpoint.
type S3APICredentials struct {
	ID     string `yaml:"id"`
	Secret string `yaml:"secret"`
}

// NewS3APICredentials returns a new usable instance of S3APICredentials.
func NewS3APICredentials() S3APICredentials {
	return S3APICredentials{
		ID:     randStr(8),
		Secret: randStr(32),
	}
}

// NewS3APIClient returns a minio client configured to use the given garage S3 API
// endpoint.
func NewS3APIClient(addr string, creds S3APICredentials) S3APIClient {

	client, err := minio.New(addr, &minio.Options{
		Creds:  credentials.NewStaticV4(creds.ID, creds.Secret, ""),
		Region: Region,
	})

	if err != nil {
		panic(fmt.Sprintf("initializing minio client at addr %q and with creds %+v", addr, creds))
	}

	return client
}