/*
 * Copyright 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
 *
 *  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 helper

import (
	"fmt"

	"github.com/pkg/errors"

	"github.com/gardener/gardener/extensions/pkg/controller"
	"github.com/gardener/gardener/extensions/pkg/util"
	extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"

	api "github.com/gardener/gardener-extension-provider-gcp/pkg/apis/gcp"
	"github.com/gardener/gardener-extension-provider-gcp/pkg/apis/gcp/install"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/serializer"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
)

var (
	// Scheme is a scheme with the types relevant for GCP actuators.
	Scheme *runtime.Scheme

	decoder runtime.Decoder
)

func init() {
	Scheme = runtime.NewScheme()
	utilruntime.Must(install.AddToScheme(Scheme))

	decoder = serializer.NewCodecFactory(Scheme).UniversalDecoder()
}

// InfrastructureConfigFromInfrastructure extracts the InfrastructureConfig from the
// ProviderConfig section of the given Infrastructure.
func InfrastructureConfigFromInfrastructure(infra *extensionsv1alpha1.Infrastructure) (*api.InfrastructureConfig, error) {
	config := &api.InfrastructureConfig{}
	if infra.Spec.ProviderConfig != nil && infra.Spec.ProviderConfig.Raw != nil {
		if _, _, err := decoder.Decode(infra.Spec.ProviderConfig.Raw, nil, config); err != nil {
			return nil, err
		}
		return config, nil
	}
	return nil, fmt.Errorf("provider config is not set on the infrastructure resource")
}

// CloudProfileConfigForCluster decodes the provider specific cloud profile configuration for a cluster
func CloudProfileConfigFromCluster(cluster *controller.Cluster) (*api.CloudProfileConfig, error) {
	var cloudProfileConfig *api.CloudProfileConfig
	if cluster != nil && cluster.CloudProfile != nil && cluster.CloudProfile.Spec.ProviderConfig != nil && cluster.CloudProfile.Spec.ProviderConfig.Raw != nil {
		cloudProfileConfig = &api.CloudProfileConfig{}
		if _, _, err := decoder.Decode(cluster.CloudProfile.Spec.ProviderConfig.Raw, nil, cloudProfileConfig); err != nil {
			return nil, errors.Wrapf(err, "could not decode providerConfig of cloudProfile for '%s'", util.ObjectName(cluster.CloudProfile))
		}
	}
	return cloudProfileConfig, nil
}