/*
Copyright 2019 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 volumebinding

import (
	"context"

	v1 "k8s.io/api/core/v1"
	"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
	"k8s.io/kubernetes/pkg/scheduler/framework/plugins/migration"
	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
	"k8s.io/kubernetes/pkg/scheduler/volumebinder"
)

// VolumeBinding is a plugin that binds pod volumes in scheduling.
type VolumeBinding struct {
	predicate predicates.FitPredicate
}

var _ framework.FilterPlugin = &VolumeBinding{}

// Name is the name of the plugin used in Registry and configurations.
const Name = "VolumeBinding"

// Name returns name of the plugin. It is used in logs, etc.
func (pl *VolumeBinding) Name() string {
	return Name
}

// Filter invoked at the filter extension point.
func (pl *VolumeBinding) Filter(ctx context.Context, cs *framework.CycleState, pod *v1.Pod, nodeInfo *schedulernodeinfo.NodeInfo) *framework.Status {
	_, reasons, err := pl.predicate(pod, nil, nodeInfo)
	return migration.PredicateResultToFrameworkStatus(reasons, err)
}

// NewFromVolumeBinder initializes a new plugin with volume binder and returns it.
func NewFromVolumeBinder(volumeBinder *volumebinder.VolumeBinder) framework.Plugin {
	return &VolumeBinding{
		predicate: predicates.NewVolumeBindingPredicate(volumeBinder),
	}
}