/*
Copyright 2016 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 common

import (
	"context"
	"fmt"
	"time"

	v1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/uuid"
	podutil "k8s.io/kubernetes/pkg/api/v1/pod"
	"k8s.io/kubernetes/test/e2e/framework"
)

const (
	ContainerStatusRetryTimeout = time.Minute * 5
	ContainerStatusPollInterval = time.Second * 1
)

// One pod one container
type ConformanceContainer struct {
	Container        v1.Container
	RestartPolicy    v1.RestartPolicy
	Volumes          []v1.Volume
	ImagePullSecrets []string

	PodClient          *framework.PodClient
	podName            string
	PodSecurityContext *v1.PodSecurityContext
}

func (cc *ConformanceContainer) Create() {
	cc.podName = cc.Container.Name + string(uuid.NewUUID())
	imagePullSecrets := []v1.LocalObjectReference{}
	for _, s := range cc.ImagePullSecrets {
		imagePullSecrets = append(imagePullSecrets, v1.LocalObjectReference{Name: s})
	}
	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name: cc.podName,
		},
		Spec: v1.PodSpec{
			RestartPolicy: cc.RestartPolicy,
			Containers: []v1.Container{
				cc.Container,
			},
			SecurityContext:  cc.PodSecurityContext,
			Volumes:          cc.Volumes,
			ImagePullSecrets: imagePullSecrets,
		},
	}
	cc.PodClient.Create(pod)
}

func (cc *ConformanceContainer) Delete() error {
	return cc.PodClient.Delete(context.TODO(), cc.podName, *metav1.NewDeleteOptions(0))
}

func (cc *ConformanceContainer) IsReady() (bool, error) {
	pod, err := cc.PodClient.Get(context.TODO(), cc.podName, metav1.GetOptions{})
	if err != nil {
		return false, err
	}
	return podutil.IsPodReady(pod), nil
}

func (cc *ConformanceContainer) GetPhase() (v1.PodPhase, error) {
	pod, err := cc.PodClient.Get(context.TODO(), cc.podName, metav1.GetOptions{})
	if err != nil {
		return v1.PodUnknown, err
	}
	return pod.Status.Phase, nil
}

func (cc *ConformanceContainer) GetStatus() (v1.ContainerStatus, error) {
	pod, err := cc.PodClient.Get(context.TODO(), cc.podName, metav1.GetOptions{})
	if err != nil {
		return v1.ContainerStatus{}, err
	}
	statuses := pod.Status.ContainerStatuses
	if len(statuses) != 1 || statuses[0].Name != cc.Container.Name {
		return v1.ContainerStatus{}, fmt.Errorf("unexpected container statuses %v", statuses)
	}
	return statuses[0], nil
}

func (cc *ConformanceContainer) Present() (bool, error) {
	_, err := cc.PodClient.Get(context.TODO(), cc.podName, metav1.GetOptions{})
	if err == nil {
		return true, nil
	}
	if apierrors.IsNotFound(err) {
		return false, nil
	}
	return false, err
}

type ContainerState string

const (
	ContainerStateWaiting    ContainerState = "Waiting"
	ContainerStateRunning    ContainerState = "Running"
	ContainerStateTerminated ContainerState = "Terminated"
	ContainerStateUnknown    ContainerState = "Unknown"
)

func GetContainerState(state v1.ContainerState) ContainerState {
	if state.Waiting != nil {
		return ContainerStateWaiting
	}
	if state.Running != nil {
		return ContainerStateRunning
	}
	if state.Terminated != nil {
		return ContainerStateTerminated
	}
	return ContainerStateUnknown
}
