/*
Copyright 2016 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 storage

import (
	"k8s.io/apimachinery/pkg/runtime/schema"
)

// APIResourceConfigSource is the interface to determine which groups and versions are enabled
type APIResourceConfigSource interface {
	VersionEnabled(version schema.GroupVersion) bool
	ResourceEnabled(resource schema.GroupVersionResource) bool
	AnyVersionForGroupEnabled(group string) bool
}

var _ APIResourceConfigSource = &ResourceConfig{}

type ResourceConfig struct {
	GroupVersionConfigs map[schema.GroupVersion]bool
	ResourceConfigs     map[schema.GroupVersionResource]bool
}

func NewResourceConfig() *ResourceConfig {
	return &ResourceConfig{GroupVersionConfigs: map[schema.GroupVersion]bool{}, ResourceConfigs: map[schema.GroupVersionResource]bool{}}
}

// DisableAll disables all group/versions. It does not modify individual resource enablement/disablement.
func (o *ResourceConfig) DisableAll() {
	for k := range o.GroupVersionConfigs {
		o.GroupVersionConfigs[k] = false
	}
}

// EnableAll enables all group/versions. It does not modify individual resource enablement/disablement.
func (o *ResourceConfig) EnableAll() {
	for k := range o.GroupVersionConfigs {
		o.GroupVersionConfigs[k] = true
	}
}

// DisableMatchingVersions disables all group/versions for which the matcher function returns true. It does not modify individual resource enablement/disablement.
func (o *ResourceConfig) DisableMatchingVersions(matcher func(gv schema.GroupVersion) bool) {
	for k := range o.GroupVersionConfigs {
		if matcher(k) {
			o.GroupVersionConfigs[k] = false
		}
	}
}

// EnableMatchingVersions enables all group/versions for which the matcher function returns true. It does not modify individual resource enablement/disablement.
func (o *ResourceConfig) EnableMatchingVersions(matcher func(gv schema.GroupVersion) bool) {
	for k := range o.GroupVersionConfigs {
		if matcher(k) {
			o.GroupVersionConfigs[k] = true
		}
	}
}

// DisableVersions disables the versions entirely.
func (o *ResourceConfig) DisableVersions(versions ...schema.GroupVersion) {
	for _, version := range versions {
		o.GroupVersionConfigs[version] = false
	}
}

func (o *ResourceConfig) EnableVersions(versions ...schema.GroupVersion) {
	for _, version := range versions {
		o.GroupVersionConfigs[version] = true
	}
}

func (o *ResourceConfig) VersionEnabled(version schema.GroupVersion) bool {
	enabled, _ := o.GroupVersionConfigs[version]
	if enabled {
		return true
	}

	return false
}

func (o *ResourceConfig) DisableResources(resources ...schema.GroupVersionResource) {
	for _, resource := range resources {
		o.ResourceConfigs[resource] = false
	}
}

func (o *ResourceConfig) EnableResources(resources ...schema.GroupVersionResource) {
	for _, resource := range resources {
		o.ResourceConfigs[resource] = true
	}
}

func (o *ResourceConfig) ResourceEnabled(resource schema.GroupVersionResource) bool {
	if !o.VersionEnabled(resource.GroupVersion()) {
		return false
	}
	resourceEnabled, explicitlySet := o.ResourceConfigs[resource]
	if !explicitlySet {
		return true
	}
	return resourceEnabled
}

func (o *ResourceConfig) AnyVersionForGroupEnabled(group string) bool {
	for version := range o.GroupVersionConfigs {
		if version.Group == group {
			if o.VersionEnabled(version) {
				return true
			}
		}
	}

	return false
}
