/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package polymorphichelpers

import (
	"fmt"
	"strconv"

	"k8s.io/apimachinery/pkg/runtime"
	api "k8s.io/kubernetes/pkg/apis/core"
	"k8s.io/kubernetes/pkg/apis/extensions"
)

func portsForObject(object runtime.Object) ([]string, error) {
	switch t := object.(type) {
	case *api.ReplicationController:
		return getPorts(t.Spec.Template.Spec), nil
	case *api.Pod:
		return getPorts(t.Spec), nil
	case *api.Service:
		return getServicePorts(t.Spec), nil
	case *extensions.Deployment:
		return getPorts(t.Spec.Template.Spec), nil
	case *extensions.ReplicaSet:
		return getPorts(t.Spec.Template.Spec), nil
	default:
		return nil, fmt.Errorf("cannot extract ports from %T", object)
	}
}

func getPorts(spec api.PodSpec) []string {
	result := []string{}
	for _, container := range spec.Containers {
		for _, port := range container.Ports {
			result = append(result, strconv.Itoa(int(port.ContainerPort)))
		}
	}
	return result
}

// Extracts the ports exposed by a service from the given service spec.
func getServicePorts(spec api.ServiceSpec) []string {
	result := []string{}
	for _, servicePort := range spec.Ports {
		result = append(result, strconv.Itoa(int(servicePort.Port)))
	}
	return result
}