package model

import (
	"strings"

	"github.com/tech/sendico/pkg/merrors"
	nm "github.com/tech/sendico/pkg/model/notification"
	"github.com/tech/sendico/pkg/mservice"
)

type NotificationEvent interface {
	GetType() mservice.Type
	GetAction() nm.NotificationAction
	ToString() string
	StringType() string
	StringAction() string
}

type NotificationEventImp struct {
	nType   mservice.Type
	nAction nm.NotificationAction
}

func (ne *NotificationEventImp) GetType() mservice.Type {
	return ne.nType
}

func (ne *NotificationEventImp) GetAction() nm.NotificationAction {
	return ne.nAction
}

const messageDelimiter string = "_"

func (ne *NotificationEventImp) Equals(other *NotificationEventImp) bool {
	return (other != nil) && (ne.nType == other.nType) && (ne.nAction == other.nAction)
}

func (ne *NotificationEventImp) ToString() string {
	action := ne.StringAction()
	if strings.Contains(action, ".") {
		return ne.StringType() + "." + action
	}
	return ne.StringType() + messageDelimiter + action
}

func (ne *NotificationEventImp) StringType() string {
	return string(ne.nType)
}

func (ne *NotificationEventImp) StringAction() string {
	return string(ne.nAction)
}

func NewNotification(t mservice.Type, a nm.NotificationAction) NotificationEvent {
	return &NotificationEventImp{nType: t, nAction: a}
}

func FromString(s string) (*NotificationEventImp, error) {
	parts := strings.Split(s, messageDelimiter)
	if len(parts) != 2 {
		return nil, merrors.Internal("invalid_notification_event_format")
	}

	res := &NotificationEventImp{}
	var err error
	if res.nType, err = mservice.StringToSType(parts[0]); err != nil {
		return nil, err
	}
	if res.nAction, err = StringToNotificationAction(parts[1]); err != nil {
		return nil, err
	}

	return res, nil
}

func StringToNotificationAction(s string) (nm.NotificationAction, error) {
	switch nm.NotificationAction(s) {
	case nm.NACreated,
		nm.NAPending,
		nm.NAUpdated,
		nm.NADeleted,
		nm.NAAssigned,
		nm.NAPasswordReset,
		nm.NADiscoveryServiceAnnounce,
		nm.NADiscoveryGatewayAnnounce,
		nm.NADiscoveryHeartbeat,
		nm.NADiscoveryLookupRequest,
		nm.NADiscoveryLookupResponse,
		nm.NADiscoveryRefreshUI:
		return nm.NotificationAction(s), nil
	default:
		return "", merrors.DataConflict("invalid Notification action: " + s)
	}
}

func StringToNotificationEvent(eventType, eventAction string) (NotificationEvent, error) {
	et, err := mservice.StringToSType(eventType)
	if err != nil {
		return nil, err
	}
	ea, err := StringToNotificationAction(eventAction)
	if err != nil {
		return nil, err
	}
	return NewNotification(et, ea), nil
}