package garage

import (
	crypticnet "cryptic-net"
	"cryptic-net/yamlutil"
	"errors"
	"fmt"
	"net"
	"strconv"

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

// 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"
}

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

// GlobalBucketAPICredentials returns APICredentials for the global bucket.
func GlobalBucketAPICredentials(env *crypticnet.Env) (APICredentials, error) {

	const path = "garage/cryptic-net-global-bucket-key.yml"

	var creds APICredentials
	if err := yamlutil.LoadYamlFSFile(&creds, env.BootstrapFS, path); err != nil {
		return APICredentials{}, fmt.Errorf("loading %q from bootstrap fs: %w", path, err)
	}

	return creds, nil
}

// APIAddr returns the network address of a garage api endpoint in the network.
// It will prefer an endpoint on this particular host, if there is one, but will
// otherwise return a random endpoint.
func APIAddr(env *crypticnet.Env) string {

	if allocs := env.ThisDaemon().Storage.Allocations; len(allocs) > 0 {

		return net.JoinHostPort(
			env.ThisHost().Nebula.IP,
			strconv.Itoa(allocs[0].APIPort),
		)

	}

	for _, host := range env.Hosts {

		if host.Garage == nil || len(host.Garage.Instances) == 0 {
			continue
		}

		return net.JoinHostPort(
			host.Nebula.IP,
			strconv.Itoa(host.Garage.Instances[0].APIPort),
		)
	}

	panic("no garage instances configured")
}

// APIClient returns a minio client configured to use the given garage API
// endpoint.
func APIClient(addr string, creds APICredentials) (*minio.Client, error) {
	return minio.New(addr, &minio.Options{
		Creds:  credentials.NewStaticV4(creds.ID, creds.Secret, ""),
		Region: Region,
	})
}

// GlobalBucketAPIClient returns a minio client pre-configured with access to
// the global bucket.
func GlobalBucketAPIClient(env *crypticnet.Env) (*minio.Client, error) {

	creds, err := GlobalBucketAPICredentials(env)
	if err != nil {
		return nil, fmt.Errorf("loading global bucket credentials: %w", err)
	}

	addr := APIAddr(env)

	return APIClient(addr, creds)
}