package servicemesh

import (
	"strings"

	apiv1alpha3 "istio.io/api/networking/v1alpha3"
	"istio.io/client-go/pkg/apis/networking/v1alpha3"
	corev1 "k8s.io/api/core/v1"
	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

const (
	AppLabel                     = "app"
	VersionLabel                 = "version"
	ApplicationNameLabel         = "app.kubernetes.io/name"
	ApplicationVersionLabel      = "app.kubernetes.io/version"
	ServiceMeshEnabledAnnotation = "servicemesh.kubesphere.io/enabled"
)

// resource with these following labels considered as part of servicemesh
var ApplicationLabels = [...]string{
	ApplicationNameLabel,
	ApplicationVersionLabel,
	AppLabel,
}

// resource with these following labels considered as part of kubernetes-sigs/application
var AppLabels = [...]string{
	ApplicationNameLabel,
	ApplicationVersionLabel,
}

var TrimChars = [...]string{".", "_", "-"}

// normalize version names
// strip [_.-]
func NormalizeVersionName(version string) string {
	for _, char := range TrimChars {
		version = strings.ReplaceAll(version, char, "")
	}
	return version
}

func GetApplictionName(lbs map[string]string) string {
	if name, ok := lbs[ApplicationNameLabel]; ok {
		return name
	}
	return ""

}

func GetComponentName(meta *v1.ObjectMeta) string {
	if len(meta.Labels[AppLabel]) > 0 {
		return meta.Labels[AppLabel]
	}
	return ""
}

func IsServicemeshEnabled(annotations map[string]string) bool {
	if enabled, ok := annotations[ServiceMeshEnabledAnnotation]; ok {
		if enabled == "true" {
			return true
		}
	}
	return false
}

func GetComponentVersion(meta *v1.ObjectMeta) string {
	if len(meta.Labels[VersionLabel]) > 0 {
		return meta.Labels[VersionLabel]
	}
	return ""
}

func ExtractApplicationLabels(meta *v1.ObjectMeta) map[string]string {

	labels := make(map[string]string, len(ApplicationLabels))
	for _, label := range ApplicationLabels {
		if _, ok := meta.Labels[label]; !ok {
			return nil
		} else {
			labels[label] = meta.Labels[label]
		}
	}

	return labels
}

func IsApplicationComponent(lbs map[string]string) bool {

	for _, label := range ApplicationLabels {
		if _, ok := lbs[label]; !ok {
			return false
		}
	}

	return true
}

// Whether it belongs to kubernetes-sigs/application or not
func IsAppComponent(lbs map[string]string) bool {

	for _, label := range AppLabels {
		if _, ok := lbs[label]; !ok {
			return false
		}
	}

	return true
}

// if virtualservice not specified with port number, then fill with service first port
func FillDestinationPort(vs *v1alpha3.VirtualService, service *corev1.Service) {
	// fill http port
	for i := range vs.Spec.Http {
		for j := range vs.Spec.Http[i].Route {
			port := vs.Spec.Http[i].Route[j].Destination.Port
			if port == nil || port.Number == 0 {
				vs.Spec.Http[i].Route[j].Destination.Port = &apiv1alpha3.PortSelector{
					Number: uint32(service.Spec.Ports[0].Port),
				}
				vs.Spec.Http[i].Match[j].Port = uint32(service.Spec.Ports[0].Port)
			}
		}

		if vs.Spec.Http[i].Mirror != nil && (vs.Spec.Http[i].Mirror.Port == nil || vs.Spec.Http[i].Mirror.Port.Number == 0) {
			vs.Spec.Http[i].Mirror.Port = &apiv1alpha3.PortSelector{
				Number: uint32(service.Spec.Ports[0].Port),
			}
		}
	}

	// fill tcp port
	for i := range vs.Spec.Tcp {
		for j := range vs.Spec.Tcp[i].Route {
			if vs.Spec.Tcp[i].Route[j].Destination.Port == nil || vs.Spec.Tcp[i].Route[j].Destination.Port.Number == 0 {
				vs.Spec.Tcp[i].Route[j].Destination.Port = &apiv1alpha3.PortSelector{
					Number: uint32(service.Spec.Ports[0].Port),
				}
				vs.Spec.Tcp[i].Match[j].Port = uint32(service.Spec.Ports[0].Port)
			}
		}
	}
}

func SupportHttpProtocol(protocol string) bool {
	httpPro := []string{"http", "http2", "grpc"}
	for _, i := range httpPro {
		if strings.ToLower(protocol) == i || strings.HasPrefix(strings.ToLower(protocol), i+"-") {
			return true
		}
	}
	return false
}