package options

import (
	"fmt"
	"net"

	"github.com/spf13/pflag"
	genericapiserver "k8s.io/apiserver/pkg/server"
	"k8s.io/apiserver/pkg/server/options"

	grafanarest "github.com/grafana/grafana/pkg/apiserver/rest"
)

type StorageType string

const (
	StorageTypeFile            StorageType = "file"
	StorageTypeEtcd            StorageType = "etcd"
	StorageTypeLegacy          StorageType = "legacy"
	StorageTypeUnified         StorageType = "unified"
	StorageTypeUnifiedGrpc     StorageType = "unified-grpc"
	StorageTypeUnifiedNext     StorageType = "unified-next"
	StorageTypeUnifiedNextGrpc StorageType = "unified-next-grpc"
)

type StorageOptions struct {
	StorageType            StorageType
	DataPath               string
	Address                string
	DualWriterDesiredModes map[string]grafanarest.DualWriterMode
}

func NewStorageOptions() *StorageOptions {
	return &StorageOptions{
		StorageType: StorageTypeLegacy,
		Address:     "localhost:10000",
	}
}

func (o *StorageOptions) AddFlags(fs *pflag.FlagSet) {
	fs.StringVar((*string)(&o.StorageType), "grafana-apiserver-storage-type", string(o.StorageType), "Storage type")
	fs.StringVar(&o.DataPath, "grafana-apiserver-storage-path", o.DataPath, "Storage path for file storage")
	fs.StringVar(&o.Address, "grafana-apiserver-storage-address", o.Address, "Remote grpc address endpoint")
}

func (o *StorageOptions) Validate() []error {
	errs := []error{}
	switch o.StorageType {
	case StorageTypeFile, StorageTypeEtcd, StorageTypeLegacy, StorageTypeUnified, StorageTypeUnifiedGrpc, StorageTypeUnifiedNext, StorageTypeUnifiedNextGrpc:
		// no-op
	default:
		errs = append(errs, fmt.Errorf("--grafana-apiserver-storage-type must be one of %s, %s, %s, %s, %s, %s, %s", StorageTypeFile, StorageTypeEtcd, StorageTypeLegacy, StorageTypeUnified, StorageTypeUnifiedGrpc, StorageTypeUnifiedNext, StorageTypeUnifiedNextGrpc))
	}

	if _, _, err := net.SplitHostPort(o.Address); err != nil {
		errs = append(errs, fmt.Errorf("--grafana-apiserver-storage-address must be a valid network address: %v", err))
	}
	return errs
}

func (o *StorageOptions) ApplyTo(serverConfig *genericapiserver.RecommendedConfig, etcdOptions *options.EtcdOptions) error {
	// TODO: move storage setup here
	return nil
}