/*
Copyright 2018 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 bucket

import (
	"fmt"
	"math/rand"
	"time"

	"github.com/coreos/pkg/capnslog"
	bktv1alpha1 "github.com/kube-object-storage/lib-bucket-provisioner/pkg/apis/objectbucket.io/v1alpha1"
	"github.com/kube-object-storage/lib-bucket-provisioner/pkg/provisioner"
	"k8s.io/api/core/v1"
	storagev1 "k8s.io/api/storage/v1"
	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"

	cephv1 "github.com/rook/rook/pkg/apis/ceph.rook.io/v1"
	cephclientset "github.com/rook/rook/pkg/client/clientset/versioned/typed/ceph.rook.io/v1"
)

var logger = capnslog.NewPackageLogger("github.com/rook/rook", "op-bucket-prov")

const (
	genUserLen           = 8
	cephUser             = "cephUser"
	provisionerName      = "ceph.rook.io/bucket"
	prefixObjectStoreSvc = "rook-ceph-rgw"
	accessKeyIdKey       = "accessKeyID"
	secretSecretKeyKey   = "secretAccessKey"
	objectStoreName      = "objectStoreName"
	objectStoreNamespace = "objectStoreNamespace"
)

func NewBucketController(cfg *rest.Config, p *Provisioner) (*provisioner.Provisioner, error) {
	const allNamespaces = ""
	logger.Infof("Ceph Bucket Provisioner launched")
	return provisioner.NewProvisioner(cfg, provisionerName, p, allNamespaces)
}

// Return the secret namespace and name from the passed storage class.
func getSecretNamespaceAndName(sc *storagev1.StorageClass) (string, string) {

	const (
		scSecretNameKey = "secretName"
		scSecretNSKey   = "secretNamespace"
	)
	return sc.Parameters[scSecretNSKey], sc.Parameters[scSecretNameKey]
}

func getAccessKeyId(secret *v1.Secret) string {
	return string(secret.Data[accessKeyIdKey])
}

func getSecretAccessKey(secret *v1.Secret) string {
	return string(secret.Data[secretSecretKeyKey])
}

func getObjectStoreName(sc *storagev1.StorageClass) string {
	return sc.Parameters[objectStoreName]
}

func getObjectStoreNameSpace(sc *storagev1.StorageClass) string {
	return sc.Parameters[objectStoreNamespace]
}

func getBucketName(ob *bktv1alpha1.ObjectBucket) string {
	return ob.Spec.Endpoint.BucketName
}

func isStaticBucket(sc *storagev1.StorageClass) (string, bool) {
	const key = "bucketName"
	val, ok := sc.Parameters[key]
	return val, ok
}

func getCephUser(ob *bktv1alpha1.ObjectBucket) string {
	return ob.Spec.AdditionalState[cephUser]
}

func getObjectStore(c cephclientset.CephV1Interface, namespace, name string) (*cephv1.CephObjectStore, error) {
	// Verify the object store API object actually exists
	store, err := c.CephObjectStores(namespace).Get(name, metav1.GetOptions{})
	if err != nil {
		if errors.IsNotFound(err) {
			return nil, fmt.Errorf("cephObjectStore not found: %v", err)
		}
		return nil, fmt.Errorf("error getting cephObjectStore: %v", err)
	}
	return store, err
}

func getService(c kubernetes.Interface, namespace, name string) (*v1.Service, error) {
	// Verify the object store's service actually exists
	svc, err := c.CoreV1().Services(namespace).Get(name, metav1.GetOptions{})
	if err != nil {
		if errors.IsNotFound(err) {
			return nil, fmt.Errorf("cephObjectStore service not found: %v", err)
		}
		return nil, fmt.Errorf("error getting cephObjectStore service: %v", err)
	}
	return svc, nil
}

func randomString(n int) string {

	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	var letterRunes = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

	b := make([]rune, n)
	for i := range b {
		b[i] = letterRunes[r.Intn(len(letterRunes))]
	}
	return string(b)
}