// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 controllers

import (
	"context"
	dsv1alpha1 "dolphinscheduler-operator/api/v1alpha1"

	"k8s.io/api/autoscaling/v2beta2"

	_ "k8s.io/api/core/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)

func (r *DSMasterReconciler) podMemberSet(ctx context.Context, cluster *dsv1alpha1.DSMaster) (MemberSet, error) {
	members := MemberSet{}
	pods := &corev1.PodList{}

	if err := r.Client.List(ctx, pods, client.InNamespace(cluster.Namespace),
		client.MatchingLabels(LabelsForCluster(dsv1alpha1.DsMasterLabel))); err != nil {
		return members, err
	}

	if len(pods.Items) > 0 {
		for _, pod := range pods.Items {
			if pod.ObjectMeta.DeletionTimestamp.IsZero() {
				m := &Member{
					Name:            pod.Name,
					Namespace:       pod.Namespace,
					Created:         true,
					Version:         pod.Labels[dsv1alpha1.DsVersionLabel],
					Phase:           string(pod.Status.Phase),
					RunningAndReady: IsRunningAndReady(&pod),
				}
				members.Add(m)
			}
		}
	}

	return members, nil
}

func newDSMasterPod(cr *dsv1alpha1.DSMaster) *corev1.Pod {
	var isSetHostnameAsFQDN bool
	isSetHostnameAsFQDN = true
	var podName = cr.Name + "-pod" + dsv1alpha1.RandStr(6)
	return &corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      podName,
			Namespace: cr.Namespace,
			Labels: map[string]string{dsv1alpha1.DsAppName: dsv1alpha1.DsMasterLabel,
				dsv1alpha1.DsVersionLabel: ImageName(cr.Spec.Repository, cr.Spec.Version),
				dsv1alpha1.DsServiceLabel: dsv1alpha1.DsServiceLabelValue},
		},
		Spec: corev1.PodSpec{
			Hostname:          podName,
			Subdomain:         dsv1alpha1.DsServiceLabelValue,
			SetHostnameAsFQDN: &isSetHostnameAsFQDN,

			Containers: []corev1.Container{
				{
					Name:            cr.Name,
					Image:           ImageName(cr.Spec.Repository, cr.Spec.Version),
					ImagePullPolicy: corev1.PullIfNotPresent,
					Env: []corev1.EnvVar{
						{
							Name:  dsv1alpha1.EnvZookeeper,
							Value: cr.Spec.ZookeeperConnect,
						}, {
							Name:  dsv1alpha1.DataSourceDriveName,
							Value: cr.Spec.Datasource.DriveName,
						},
						{
							Name:  dsv1alpha1.DataSourceUrl,
							Value: cr.Spec.Datasource.Url,
						},
						{
							Name:  dsv1alpha1.DataSourceUserName,
							Value: cr.Spec.Datasource.UserName,
						},
						{
							Name:  dsv1alpha1.DataSourcePassWord,
							Value: cr.Spec.Datasource.Password,
						},
					},
				},
			},
		},
	}
}

func (r *DSMasterReconciler) ensureDSMasterDeleted(ctx context.Context, DSMaster *dsv1alpha1.DSMaster) error {
	if err := r.Client.Delete(ctx, DSMaster, client.PropagationPolicy(metav1.DeletePropagationBackground)); err != nil {
		return err
	}
	return nil
}

func (r *DSMasterReconciler) newDSMasterPod(cluster *dsv1alpha1.DSMaster) (*corev1.Pod, error) {
	// Create pod
	pod := newDSMasterPod(cluster)
	if err := controllerutil.SetControllerReference(cluster, pod, r.Scheme); err != nil {
		return nil, err
	}
	AddLogVolumeToPod(pod, cluster.Spec.LogPvcName)
	applyPodPolicy(pod, cluster.Spec.Pod)
	return pod, nil
}

func createMasterService(cluster *dsv1alpha1.DSMaster) *corev1.Service {
	labels_ := LabelsForService()
	service := corev1.Service{
		ObjectMeta: metav1.ObjectMeta{
			Name:      dsv1alpha1.DsHeadLessServiceLabel,
			Namespace: cluster.Namespace,
			Labels:    map[string]string{dsv1alpha1.DsAppName: dsv1alpha1.DsHeadLessServiceLabel},
		},
		Spec: corev1.ServiceSpec{
			Selector:                 labels_,
			ClusterIP:                corev1.ClusterIPNone,
			PublishNotReadyAddresses: true,
		},
	}
	return &service
}

func (r *DSMasterReconciler) createHPA(cluster *dsv1alpha1.DSMaster) *v2beta2.HorizontalPodAutoscaler {
	hpa := v2beta2.HorizontalPodAutoscaler{
		ObjectMeta: metav1.ObjectMeta{
			Name:            dsv1alpha1.DsWorkerHpa,
			Namespace:       cluster.Namespace,
			ResourceVersion: dsv1alpha1.DSVersion,
		},
		Spec: v2beta2.HorizontalPodAutoscalerSpec{
			ScaleTargetRef: v2beta2.CrossVersionObjectReference{
				Kind:       dsv1alpha1.DsWorkerKind,
				Name:       dsv1alpha1.DsWorkerLabel,
				APIVersion: dsv1alpha1.APIVersion,
			},
			MinReplicas: &cluster.Spec.HpaPolicy.MinReplicas,
			MaxReplicas: cluster.Spec.HpaPolicy.MaxReplicas,
		},
	}

	if cluster.Spec.HpaPolicy.CPUAverageUtilization > 0 {
		hpa.Spec.Metrics = append(hpa.Spec.Metrics, v2beta2.MetricSpec{
			Type: v2beta2.ResourceMetricSourceType,
			Resource: &v2beta2.ResourceMetricSource{
				Name: corev1.ResourceCPU,
				Target: v2beta2.MetricTarget{
					Type:               v2beta2.UtilizationMetricType,
					AverageUtilization: &cluster.Spec.HpaPolicy.CPUAverageUtilization,
				},
			},
		})
	}

	if cluster.Spec.HpaPolicy.MEMAverageUtilization > 0 {
		hpa.Spec.Metrics = append(hpa.Spec.Metrics, v2beta2.MetricSpec{
			Type: v2beta2.ResourceMetricSourceType,
			Resource: &v2beta2.ResourceMetricSource{
				Name: corev1.ResourceMemory,
				Target: v2beta2.MetricTarget{
					Type:               v2beta2.UtilizationMetricType,
					AverageUtilization: &cluster.Spec.HpaPolicy.MEMAverageUtilization,
				},
			},
		})
	}

	return &hpa
}

func (r *DSMasterReconciler) deleteHPA(ctx context.Context, hpa *v2beta2.HorizontalPodAutoscaler) error {
	if err := r.Client.Delete(ctx, hpa, client.PropagationPolicy(metav1.DeletePropagationOrphan)); err != nil {
		return err
	}
	return nil
}