/*
Copyright 2016 Skippbox, Ltd All rights reserved.

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 kubernetes

import (
	"fmt"
	"strconv"

	"github.com/Sirupsen/logrus"
	deployapi "github.com/openshift/origin/pkg/deploy/api"
	"github.com/skippbox/kompose/pkg/kobject"
	"github.com/skippbox/kompose/pkg/transformer"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/unversioned"
	"k8s.io/kubernetes/pkg/apis/extensions"
	client "k8s.io/kubernetes/pkg/client/unversioned"
	"k8s.io/kubernetes/pkg/runtime"
	"k8s.io/kubernetes/pkg/util/intstr"
)

type Kubernetes struct {
}

// Init RC object
func InitRC(name string, service kobject.ServiceConfig, replicas int) *api.ReplicationController {
	rc := &api.ReplicationController{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "ReplicationController",
			APIVersion: "v1",
		},
		ObjectMeta: api.ObjectMeta{
			Name: name,
		},
		Spec: api.ReplicationControllerSpec{
			Replicas: int32(replicas),
			Template: &api.PodTemplateSpec{
				ObjectMeta: api.ObjectMeta{
					Labels: transformer.ConfigLabels(name),
				},
				Spec: api.PodSpec{
					Containers: []api.Container{
						{
							Name:  name,
							Image: service.Image,
						},
					},
				},
			},
		},
	}
	return rc
}

// Init Svc object
func InitSvc(name string, service kobject.ServiceConfig) *api.Service {
	svc := &api.Service{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "Service",
			APIVersion: "v1",
		},
		ObjectMeta: api.ObjectMeta{
			Name:   name,
			Labels: transformer.ConfigLabels(name),
		},
		Spec: api.ServiceSpec{
			Selector: transformer.ConfigLabels(name),
		},
	}
	return svc
}

// Init Deployment
func InitD(name string, service kobject.ServiceConfig, replicas int) *extensions.Deployment {
	dc := &extensions.Deployment{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "Deployment",
			APIVersion: "extensions/v1beta1",
		},
		ObjectMeta: api.ObjectMeta{
			Name: name,
		},
		Spec: extensions.DeploymentSpec{
			Replicas: int32(replicas),
			Template: api.PodTemplateSpec{
				Spec: api.PodSpec{
					Containers: []api.Container{
						{
							Name:  name,
							Image: service.Image,
						},
					},
				},
			},
		},
	}
	return dc
}

// Init DS object
func InitDS(name string, service kobject.ServiceConfig) *extensions.DaemonSet {
	ds := &extensions.DaemonSet{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "DaemonSet",
			APIVersion: "extensions/v1beta1",
		},
		ObjectMeta: api.ObjectMeta{
			Name: name,
		},
		Spec: extensions.DaemonSetSpec{
			Template: api.PodTemplateSpec{
				Spec: api.PodSpec{
					Containers: []api.Container{
						{
							Name:  name,
							Image: service.Image,
						},
					},
				},
			},
		},
	}
	return ds
}

// Configure the container ports.
func ConfigPorts(name string, service kobject.ServiceConfig) []api.ContainerPort {
	ports := []api.ContainerPort{}
	for _, port := range service.Port {
		ports = append(ports, api.ContainerPort{
			ContainerPort: port.ContainerPort,
			Protocol:      port.Protocol,
		})
	}

	return ports
}

// Configure the container service ports.
func ConfigServicePorts(name string, service kobject.ServiceConfig) []api.ServicePort {
	servicePorts := []api.ServicePort{}
	for _, port := range service.Port {
		if port.HostPort == 0 {
			port.HostPort = port.ContainerPort
		}
		var targetPort intstr.IntOrString
		targetPort.IntVal = port.ContainerPort
		targetPort.StrVal = strconv.Itoa(int(port.ContainerPort))
		servicePorts = append(servicePorts, api.ServicePort{
			Name:       strconv.Itoa(int(port.HostPort)),
			Protocol:   port.Protocol,
			Port:       port.HostPort,
			TargetPort: targetPort,
		})
	}
	return servicePorts
}

// Configure the container volumes.
func ConfigVolumes(service kobject.ServiceConfig) ([]api.VolumeMount, []api.Volume) {
	volumesMount := []api.VolumeMount{}
	volumes := []api.Volume{}
	volumeSource := api.VolumeSource{}
	for _, volume := range service.Volumes {
		name, host, container, mode, err := transformer.ParseVolume(volume)
		if err != nil {
			logrus.Warningf("Failed to configure container volume: %v", err)
			continue
		}

		// if volume name isn't specified, set it to a random string of 20 chars
		if len(name) == 0 {
			name = transformer.RandStringBytes(20)
		}
		// check if ro/rw mode is defined, default rw
		readonly := len(mode) > 0 && mode == "ro"

		volumesMount = append(volumesMount, api.VolumeMount{Name: name, ReadOnly: readonly, MountPath: container})

		if len(host) > 0 {
			volumeSource = api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: host}}
		} else {
			volumeSource = api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}
		}

		volumes = append(volumes, api.Volume{Name: name, VolumeSource: volumeSource})
	}
	return volumesMount, volumes
}

// Configure the environment variables.
func ConfigEnvs(name string, service kobject.ServiceConfig) []api.EnvVar {
	envs := []api.EnvVar{}
	for _, v := range service.Environment {
		envs = append(envs, api.EnvVar{
			Name:  v.Name,
			Value: v.Value,
		})
	}

	return envs
}

// Generate a Kubernetes artifacts for each input type service
func CreateKubernetesObjects(name string, service kobject.ServiceConfig, opt kobject.ConvertOptions) []runtime.Object {
	var objects []runtime.Object

	if opt.CreateD {
		objects = append(objects, InitD(name, service, opt.Replicas))
	}
	if opt.CreateDS {
		objects = append(objects, InitDS(name, service))
	}
	if opt.CreateRC {
		objects = append(objects, InitRC(name, service, opt.Replicas))
	}

	return objects
}

func (k *Kubernetes) Transform(komposeObject kobject.KomposeObject, opt kobject.ConvertOptions) []runtime.Object {
	// this will hold all the converted data
	var allobjects []runtime.Object

	for name, service := range komposeObject.ServiceConfigs {
		objects := CreateKubernetesObjects(name, service, opt)

		// If ports not provided in configuration we will not make service
		if PortsExist(name, service) {
			svc := CreateService(name, service, objects)
			objects = append(objects, svc)
		}

		UpdateKubernetesObjects(name, service, objects)

		allobjects = append(allobjects, objects...)
	}

	return allobjects
}

// updateController updates the given object with the given pod template update function and ObjectMeta update function
func UpdateController(obj runtime.Object, updateTemplate func(*api.PodTemplateSpec), updateMeta func(meta *api.ObjectMeta)) {
	switch t := obj.(type) {
	case *api.ReplicationController:
		if t.Spec.Template == nil {
			t.Spec.Template = &api.PodTemplateSpec{}
		}
		updateTemplate(t.Spec.Template)
		updateMeta(&t.ObjectMeta)
	case *extensions.Deployment:
		updateTemplate(&t.Spec.Template)
		updateMeta(&t.ObjectMeta)
	case *extensions.DaemonSet:
		updateTemplate(&t.Spec.Template)
		updateMeta(&t.ObjectMeta)
	case *deployapi.DeploymentConfig:
		updateTemplate(t.Spec.Template)
		updateMeta(&t.ObjectMeta)
	}
}

func CreateObjects(client *client.Client, objects []runtime.Object) {
	for _, v := range objects {
		switch t := v.(type) {
		case *extensions.Deployment:
			_, err := client.Deployments(api.NamespaceDefault).Create(t)
			if err != nil {
				logrus.Fatalf("Error: '%v' while creating deployment: %s", err, t.Name)
			}
			logrus.Infof("Successfully created deployment: %s", t.Name)
		case *api.Service:
			_, err := client.Services(api.NamespaceDefault).Create(t)
			if err != nil {
				logrus.Fatalf("Error: '%v' while creating service: %s", err, t.Name)
			}
			logrus.Infof("Successfully created service: %s", t.Name)
		}
	}
	fmt.Println("\nApplication has been deployed to Kubernetes. You can run 'kubectl get deployment,svc' for details.")
}