/*
 * Copyright 2019 Intel Corporation, Inc
 *
 * 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 connector

import (
	"log"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/dynamic"
	"k8s.io/client-go/kubernetes"
)

// KubernetesConnector is an interface that is expected to be implemented
// by any code that calls the plugin framework functions.
// It implements methods that are needed by the plugins to get Kubernetes
// clients and other information needed to interface with Kubernetes
type KubernetesConnector interface {
	//GetMapper returns the RESTMapper that was created for this client
	GetMapper() meta.RESTMapper

	//GetDynamicClient returns the dynamic client that is needed for
	//unstructured REST calls to the apiserver
	GetDynamicClient() dynamic.Interface

	// GetStandardClient returns the standard client that can be used to handle
	// standard kubernetes kinds
	GetStandardClient() kubernetes.Interface

	//GetInstanceID returns the InstanceID for tracking during creation
	GetInstanceID() string
}

// Reference is the interface that is implemented
type Reference interface {
	//Create a kubernetes resource described by the yaml in yamlFilePath
	Create(yamlFilePath string, namespace string, label string, client KubernetesConnector) (string, error)
	//Delete a kubernetes resource described in the provided namespace
	Delete(yamlFilePath string, resname string, namespace string, client KubernetesConnector) error
}

// TagPodsIfPresent finds the PodTemplateSpec from any workload
// object that contains it and changes the spec to include the tag label
func TagPodsIfPresent(unstruct *unstructured.Unstructured, tag string) {

	spec, ok := unstruct.Object["spec"].(map[string]interface{})
	if !ok {
		log.Println("Error converting spec to map")
		return
	}

	template, ok := spec["template"].(map[string]interface{})
	if !ok {
		log.Println("Error converting template to map")
		return
	}

	//Attempt to convert the template to a podtemplatespec.
	//This is to check if we have any pods being created.
	podTemplateSpec := &corev1.PodTemplateSpec{}
	err := runtime.DefaultUnstructuredConverter.FromUnstructured(template, podTemplateSpec)
	if err != nil {
		log.Println("Did not find a podTemplateSpec: " + err.Error())
		return
	}

	labels := podTemplateSpec.GetLabels()
	if labels == nil {
		labels = map[string]string{}
	}
	labels["emco/deployment-id"] = tag
	podTemplateSpec.SetLabels(labels)

	updatedTemplate, err := runtime.DefaultUnstructuredConverter.ToUnstructured(podTemplateSpec)

	//Set the label
	spec["template"] = updatedTemplate
}