/*
Copyright 2022 The Kruise 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 client

import (
	"fmt"

	kruiseclientset "github.com/openkruise/kruise-api/client/clientset/versioned"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/discovery"
	kubeclientset "k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
)

// GenericClientset defines a generic client
type GenericClientset struct {
	DiscoveryClient discovery.DiscoveryInterface
	KubeClient      kubeclientset.Interface
	KruiseClient    kruiseclientset.Interface
}

var (
	cfg                  *rest.Config
	defaultGenericClient *GenericClientset
)

// newForConfig creates a new Clientset for the given config.
func newForConfig(c *rest.Config) (*GenericClientset, error) {
	cWithProtobuf := rest.CopyConfig(c)
	cWithProtobuf.ContentType = runtime.ContentTypeProtobuf
	discoveryClient, err := discovery.NewDiscoveryClientForConfig(cWithProtobuf)
	if err != nil {
		return nil, err
	}
	kubeClient, err := kubeclientset.NewForConfig(cWithProtobuf)
	if err != nil {
		return nil, err
	}
	kruiseClient, err := kruiseclientset.NewForConfig(c)
	if err != nil {
		return nil, err
	}
	return &GenericClientset{
		DiscoveryClient: discoveryClient,
		KubeClient:      kubeClient,
		KruiseClient:    kruiseClient,
	}, nil
}

// NewRegistry creates clientset by client-go
func NewRegistry(c *rest.Config) error {
	var err error
	defaultGenericClient, err = newForConfig(c)
	if err != nil {
		return err
	}
	cfgCopy := *c
	cfg = &cfgCopy
	return nil
}

// GetGenericClient returns default clientset
func GetGenericClient() *GenericClientset {
	return defaultGenericClient
}

// GetGenericClientWithName returns clientset with given name as user-agent
func GetGenericClientWithName(name string) *GenericClientset {
	if cfg == nil {
		return nil
	}
	newCfg := *cfg
	newCfg.UserAgent = fmt.Sprintf("%s/%s", cfg.UserAgent, name)
	clientset, _ := newForConfig(cfg)
	return clientset
}