/*
Copyright 2017 The Rook Authors. All rights reserved.

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 k8sutil for Kubernetes helpers.
package k8sutil

import (
	"context"

	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/kubernetes"
)

type ConfigMapKVStore struct {
	namespace string
	clientset kubernetes.Interface
	ownerInfo *OwnerInfo
}

func NewConfigMapKVStore(namespace string, clientset kubernetes.Interface, ownerInfo *OwnerInfo) *ConfigMapKVStore {
	return &ConfigMapKVStore{
		namespace: namespace,
		clientset: clientset,
		ownerInfo: ownerInfo,
	}
}

func (kv *ConfigMapKVStore) GetValue(ctx context.Context, storeName, key string) (string, error) {
	cm, err := kv.clientset.CoreV1().ConfigMaps(kv.namespace).Get(ctx, storeName, metav1.GetOptions{})
	if err != nil {
		return "", err
	}

	val, ok := cm.Data[key]
	if !ok {
		return "", errors.NewNotFound(schema.GroupResource{}, key)
	}

	return val, nil
}

func (kv *ConfigMapKVStore) SetValue(ctx context.Context, storeName, key, value string) error {
	return kv.SetValueWithLabels(ctx, storeName, key, value, nil)
}

func (kv *ConfigMapKVStore) SetValueWithLabels(ctx context.Context, storeName, key, value string, labels map[string]string) error {
	cm, err := kv.clientset.CoreV1().ConfigMaps(kv.namespace).Get(ctx, storeName, metav1.GetOptions{})
	if err != nil {
		if !errors.IsNotFound(err) {
			return err
		}

		// the given config map doesn't exist yet, create it now with the given key/val
		cm = &v1.ConfigMap{
			ObjectMeta: metav1.ObjectMeta{
				Name:      storeName,
				Namespace: kv.namespace,
			},
			Data: map[string]string{key: value},
		}
		if labels != nil {
			cm.Labels = labels
		}
		err = kv.ownerInfo.SetControllerReference(cm)
		if err != nil {
			return err
		}

		_, err = kv.clientset.CoreV1().ConfigMaps(kv.namespace).Create(ctx, cm, metav1.CreateOptions{})
		return err
	}

	// config map already exists, so update it with the given key/val
	cm.Data[key] = value

	_, err = kv.clientset.CoreV1().ConfigMaps(kv.namespace).Update(ctx, cm, metav1.UpdateOptions{})
	if err != nil {
		return err
	}

	return nil
}

func (kv *ConfigMapKVStore) GetStore(ctx context.Context, storeName string) (map[string]string, error) {
	cm, err := kv.clientset.CoreV1().ConfigMaps(kv.namespace).Get(ctx, storeName, metav1.GetOptions{})
	if err != nil {
		return nil, err
	}

	return cm.Data, nil
}

func (kv *ConfigMapKVStore) ClearStore(ctx context.Context, storeName string) error {
	err := kv.clientset.CoreV1().ConfigMaps(kv.namespace).Delete(ctx, storeName, metav1.DeleteOptions{})
	if err != nil && !errors.IsNotFound(err) {
		// a real error, return it (we're OK with clearing a store that doesn't exist)
		return err
	}

	return nil
}