package external

import (
	"encoding/json"
	"fmt"

	cuc "git.loafle.net/commons/util-go/context"
)

const (
	GRPCClientTypeKey = cuc.ContextKey("OVERFLOW_GRPC_CLIENT_TYPE")
	GRPCSessionIDKey  = cuc.ContextKey("OVERFLOW_GRPC_SESSION_ID")
	GRPCTargetIDKey   = cuc.ContextKey("OVERFLOW_GRPC_TARGET_ID")
)

type ClientType int

const (
	MEMBER ClientType = iota
	PROBE
	CONSUMER
)

var (
	clientTypeID = map[ClientType]string{
		MEMBER:   "MEMBER",
		PROBE:    "PROBE",
		CONSUMER: "CONSUMER",
	}

	clientTypeName = map[string]ClientType{
		"MEMBER":   MEMBER,
		"PROBE":    PROBE,
		"CONSUMER": CONSUMER,
	}
)

func (ct ClientType) String() string {
	return clientTypeID[ct]
}

func (ct ClientType) MarshalJSON() ([]byte, error) {
	value, ok := clientTypeID[ct]
	if !ok {
		return nil, fmt.Errorf("Invalid EnumType[%s] value", ct)
	}
	return json.Marshal(value)
}

func (ct ClientType) UnmarshalJSON(b []byte) error {
	// unmarshal as string
	var s string
	err := json.Unmarshal(b, &s)
	if err != nil {
		return err
	}

	value, ok := clientTypeName[s]
	if !ok {
		return fmt.Errorf("Invalid EnumType[%s] value", s)
	}
	ct = value
	return nil
}