/*
Copyright 2015 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 cadvisor

import (
	goruntime "runtime"

	cadvisorapi "github.com/google/cadvisor/info/v1"
	cadvisorapi2 "github.com/google/cadvisor/info/v2"
	"k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
	"k8s.io/kubernetes/pkg/features"
	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
)

const (
	// Please keep this in sync with the one in:
	// github.com/google/cadvisor/container/crio/client.go
	CrioSocket = "/var/run/crio/crio.sock"
)

func CapacityFromMachineInfo(info *cadvisorapi.MachineInfo) v1.ResourceList {
	c := v1.ResourceList{
		v1.ResourceCPU: *resource.NewMilliQuantity(
			int64(info.NumCores*1000),
			resource.DecimalSI),
		v1.ResourceMemory: *resource.NewQuantity(
			int64(info.MemoryCapacity),
			resource.BinarySI),
	}

	// if huge pages are enabled, we report them as a schedulable resource on the node
	if utilfeature.DefaultFeatureGate.Enabled(features.HugePages) {
		for _, hugepagesInfo := range info.HugePages {
			pageSizeBytes := int64(hugepagesInfo.PageSize * 1024)
			hugePagesBytes := pageSizeBytes * int64(hugepagesInfo.NumPages)
			pageSizeQuantity := resource.NewQuantity(pageSizeBytes, resource.BinarySI)
			c[v1helper.HugePageResourceName(*pageSizeQuantity)] = *resource.NewQuantity(hugePagesBytes, resource.BinarySI)
		}
	}

	return c
}

func EphemeralStorageCapacityFromFsInfo(info cadvisorapi2.FsInfo) v1.ResourceList {
	c := v1.ResourceList{
		v1.ResourceEphemeralStorage: *resource.NewQuantity(
			int64(info.Capacity),
			resource.BinarySI),
	}
	return c
}

// CRI integrations should get container metrics via CRI. Docker
// uses the built-in cadvisor to gather such metrics on Linux for
// historical reasons.
// cri-o relies on cadvisor as a temporary workaround. The code should
// be removed. Related issue:
// https://github.com/kubernetes/kubernetes/issues/51798
// UsingLegacyCadvisorStats returns true if container stats are provided by cadvisor instead of through the CRI
func UsingLegacyCadvisorStats(runtime, runtimeEndpoint string) bool {
	return runtime == kubetypes.RktContainerRuntime ||
		(runtime == kubetypes.DockerContainerRuntime && goruntime.GOOS == "linux") ||
		runtimeEndpoint == CrioSocket
}