/*
Copyright 2016 The Rook Authors. 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 mon for the Ceph monitors.
package mon

import (
	"fmt"

	"github.com/rook/rook/pkg/operator/k8sutil"
	"k8s.io/api/core/v1"
	extensions "k8s.io/api/extensions/v1beta1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/kubernetes/pkg/kubelet/apis"
)

// PublicIPEnvVar is the public ip env var for monitors
func PublicIPEnvVar(publicIP string) v1.EnvVar {
	return v1.EnvVar{Name: k8sutil.PublicIPEnvVar, Value: publicIP}
}

// ClusterNameEnvVar is the cluster name environment var
func ClusterNameEnvVar(name string) v1.EnvVar {
	return v1.EnvVar{Name: "ROOK_CLUSTER_NAME", Value: name}
}

// EndpointEnvVar is the mon endpoint environment var
func EndpointEnvVar() v1.EnvVar {
	ref := &v1.ConfigMapKeySelector{LocalObjectReference: v1.LocalObjectReference{Name: EndpointConfigMapName}, Key: EndpointDataKey}
	return v1.EnvVar{Name: "ROOK_MON_ENDPOINTS", ValueFrom: &v1.EnvVarSource{ConfigMapKeyRef: ref}}
}

// SecretEnvVar is the mon secret environment var
func SecretEnvVar() v1.EnvVar {
	ref := &v1.SecretKeySelector{LocalObjectReference: v1.LocalObjectReference{Name: appName}, Key: monSecretName}
	return v1.EnvVar{Name: "ROOK_MON_SECRET", ValueFrom: &v1.EnvVarSource{SecretKeyRef: ref}}
}

// AdminSecretEnvVar is the admin secret environment var
func AdminSecretEnvVar() v1.EnvVar {
	ref := &v1.SecretKeySelector{LocalObjectReference: v1.LocalObjectReference{Name: appName}, Key: adminSecretName}
	return v1.EnvVar{Name: "ROOK_ADMIN_SECRET", ValueFrom: &v1.EnvVarSource{SecretKeyRef: ref}}
}

func (c *Cluster) getLabels(name string) map[string]string {
	return map[string]string{
		k8sutil.AppAttr: appName,
		"mon":           name,
		monClusterAttr:  c.Namespace,
	}
}

func (c *Cluster) makeReplicaSet(config *monConfig, nodeName string) *extensions.ReplicaSet {
	rs := &extensions.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:            config.Name,
			Namespace:       c.Namespace,
			OwnerReferences: []metav1.OwnerReference{c.ownerRef},
		},
	}

	pod := c.makeMonPod(config, nodeName)
	replicaCount := int32(1)
	rs.Spec = extensions.ReplicaSetSpec{
		Template: v1.PodTemplateSpec{
			ObjectMeta: pod.ObjectMeta,
			Spec:       pod.Spec,
		},
		Replicas: &replicaCount,
	}

	return rs
}

func (c *Cluster) makeMonPod(config *monConfig, nodeName string) *v1.Pod {
	dataDirSource := v1.VolumeSource{EmptyDir: &v1.EmptyDirVolumeSource{}}
	if c.dataDirHostPath != "" {
		dataDirSource = v1.VolumeSource{HostPath: &v1.HostPathVolumeSource{Path: c.dataDirHostPath}}
	}

	container := c.monContainer(config, c.clusterInfo.FSID)
	podSpec := v1.PodSpec{
		Containers:    []v1.Container{container},
		RestartPolicy: v1.RestartPolicyAlways,
		NodeSelector:  map[string]string{apis.LabelHostname: nodeName},
		Volumes: []v1.Volume{
			{Name: k8sutil.DataDirVolume, VolumeSource: dataDirSource},
			k8sutil.ConfigOverrideVolume(),
		},
		HostNetwork: c.HostNetwork,
	}
	if c.HostNetwork {
		podSpec.DNSPolicy = v1.DNSClusterFirstWithHostNet
	}
	c.placement.ApplyToPodSpec(&podSpec)
	// remove Pod (anti-)affinity because we have our own placement logic
	c.placement.PodAffinity = nil
	c.placement.PodAntiAffinity = nil

	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:        config.Name,
			Namespace:   c.Namespace,
			Labels:      c.getLabels(config.Name),
			Annotations: map[string]string{},
		},
		Spec: podSpec,
	}

	return pod
}

func (c *Cluster) monContainer(config *monConfig, fsid string) v1.Container {
	return v1.Container{
		Args: []string{
			"mon",
			fmt.Sprintf("--config-dir=%s", k8sutil.DataDir),
			fmt.Sprintf("--name=%s", config.Name),
			fmt.Sprintf("--port=%d", config.Port),
			fmt.Sprintf("--fsid=%s", fsid),
		},
		Name:  appName,
		Image: k8sutil.MakeRookImage(c.Version),
		Ports: []v1.ContainerPort{
			{
				Name:          "client",
				ContainerPort: config.Port,
				Protocol:      v1.ProtocolTCP,
			},
		},
		VolumeMounts: []v1.VolumeMount{
			{Name: k8sutil.DataDirVolume, MountPath: k8sutil.DataDir},
			k8sutil.ConfigOverrideMount(),
		},
		Env: []v1.EnvVar{
			k8sutil.PodIPEnvVar(k8sutil.PrivateIPEnvVar),
			PublicIPEnvVar(config.PublicIP),
			ClusterNameEnvVar(c.Namespace),
			EndpointEnvVar(),
			SecretEnvVar(),
			AdminSecretEnvVar(),
			k8sutil.ConfigOverrideEnvVar(),
		},
		Resources: c.resources,
	}
}