package controllers

import (
	"fmt"
	"strings"

	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/intstr"

	seaweedv1 "github.com/seaweedfs/seaweedfs-operator/api/v1"
)

func buildVolumeServerStartupScript(m *seaweedv1.Seaweed, dirs []string) string {
	commands := []string{"weed", "volume"}
	commands = append(commands, fmt.Sprintf("-port=%d", seaweedv1.VolumeHTTPPort))
	commands = append(commands, "-max=0")
	commands = append(commands, fmt.Sprintf("-ip=$(POD_NAME).%s-volume-peer", m.Name))
	commands = append(commands, fmt.Sprintf("-mserver=%s", getMasterPeersString(m)))
	commands = append(commands, fmt.Sprintf("-dir=%s", strings.Join(dirs, ",")))

	return strings.Join(commands, " ")
}

func (r *SeaweedReconciler) createVolumeServerStatefulSet(m *seaweedv1.Seaweed) *appsv1.StatefulSet {
	labels := labelsForVolumeServer(m.Name)
	replicas := int32(m.Spec.Volume.Replicas)
	rollingUpdatePartition := int32(0)
	enableServiceLinks := false

	volumeCount := int(m.Spec.VolumeServerDiskCount)
	volumeRequests := corev1.ResourceList{
		corev1.ResourceStorage: m.Spec.Volume.Requests[corev1.ResourceStorage],
	}

	// connect all the disks
	var volumeMounts []corev1.VolumeMount
	var volumes []corev1.Volume
	var persistentVolumeClaims []corev1.PersistentVolumeClaim
	var dirs []string
	for i := 0; i < volumeCount; i++ {
		volumeMounts = append(volumeMounts, corev1.VolumeMount{
			Name:      fmt.Sprintf("mount%d", i),
			ReadOnly:  false,
			MountPath: fmt.Sprintf("/data%d/", i),
		})
		volumes = append(volumes, corev1.Volume{
			Name: fmt.Sprintf("mount%d", i),
			VolumeSource: corev1.VolumeSource{
				PersistentVolumeClaim: &corev1.PersistentVolumeClaimVolumeSource{
					ClaimName: fmt.Sprintf("mount%d", i),
					ReadOnly:  false,
				},
			},
		})
		persistentVolumeClaims = append(persistentVolumeClaims, corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{
				Name: fmt.Sprintf("mount%d", i),
			},
			Spec: corev1.PersistentVolumeClaimSpec{
				StorageClassName: m.Spec.Volume.StorageClassName,
				AccessModes: []corev1.PersistentVolumeAccessMode{
					corev1.ReadWriteOnce,
				},
				Resources: corev1.ResourceRequirements{
					Requests: volumeRequests,
				},
			},
		})
		dirs = append(dirs, fmt.Sprintf("/data%d", i))
	}

	volumePodSpec := m.BaseVolumeSpec().BuildPodSpec()
	volumePodSpec.EnableServiceLinks = &enableServiceLinks
	volumePodSpec.Containers = []corev1.Container{{
		Name:            "volume",
		Image:           m.Spec.Image,
		ImagePullPolicy: m.BaseVolumeSpec().ImagePullPolicy(),
		Env:             append(m.BaseVolumeSpec().Env(), kubernetesEnvVars...),
		Command: []string{
			"/bin/sh",
			"-ec",
			buildVolumeServerStartupScript(m, dirs),
		},
		Ports: []corev1.ContainerPort{
			{
				ContainerPort: seaweedv1.VolumeHTTPPort,
				Name:          "volume-http",
			},
			{
				ContainerPort: seaweedv1.VolumeGRPCPort,
				Name:          "volume-grpc",
			},
		},
		ReadinessProbe: &corev1.Probe{
			Handler: corev1.Handler{
				HTTPGet: &corev1.HTTPGetAction{
					Path:   "/status",
					Port:   intstr.FromInt(seaweedv1.VolumeHTTPPort),
					Scheme: corev1.URISchemeHTTP,
				},
			},
			InitialDelaySeconds: 15,
			TimeoutSeconds:      5,
			PeriodSeconds:       90,
			SuccessThreshold:    1,
			FailureThreshold:    100,
		},
		LivenessProbe: &corev1.Probe{
			Handler: corev1.Handler{
				HTTPGet: &corev1.HTTPGetAction{
					Path:   "/status",
					Port:   intstr.FromInt(seaweedv1.VolumeHTTPPort),
					Scheme: corev1.URISchemeHTTP,
				},
			},
			InitialDelaySeconds: 20,
			TimeoutSeconds:      5,
			PeriodSeconds:       90,
			SuccessThreshold:    1,
			FailureThreshold:    6,
		},
		VolumeMounts: volumeMounts,
	}}
	volumePodSpec.Volumes = volumes

	dep := &appsv1.StatefulSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:      m.Name + "-volume",
			Namespace: m.Namespace,
		},
		Spec: appsv1.StatefulSetSpec{
			ServiceName:         m.Name + "-volume-peer",
			PodManagementPolicy: appsv1.ParallelPodManagement,
			Replicas:            &replicas,
			UpdateStrategy: appsv1.StatefulSetUpdateStrategy{
				Type: appsv1.RollingUpdateStatefulSetStrategyType,
				RollingUpdate: &appsv1.RollingUpdateStatefulSetStrategy{
					Partition: &rollingUpdatePartition,
				},
			},
			Selector: &metav1.LabelSelector{
				MatchLabels: labels,
			},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: labels,
				},
				Spec: volumePodSpec,
			},
			VolumeClaimTemplates: persistentVolumeClaims,
		},
	}
	return dep
}