/*
Copyright 2020 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 client_test

import (
	"context"
	"fmt"
	"sync/atomic"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"

	"sigs.k8s.io/controller-runtime/pkg/client"
)

var _ = Describe("DryRunClient", func() {
	var dep *appsv1.Deployment
	var count uint64 = 0
	var replicaCount int32 = 2
	var ns = "default"
	ctx := context.Background()

	getClient := func() client.Client {
		nonDryRunClient, err := client.New(cfg, client.Options{})
		Expect(err).NotTo(HaveOccurred())
		Expect(nonDryRunClient).NotTo(BeNil())
		return client.NewDryRunClient(nonDryRunClient)
	}

	BeforeEach(func() {
		atomic.AddUint64(&count, 1)
		dep = &appsv1.Deployment{
			ObjectMeta: metav1.ObjectMeta{
				Name:      fmt.Sprintf("dry-run-deployment-%v", count),
				Namespace: ns,
				Labels:    map[string]string{"name": fmt.Sprintf("dry-run-deployment-%v", count)},
			},
			Spec: appsv1.DeploymentSpec{
				Replicas: &replicaCount,
				Selector: &metav1.LabelSelector{
					MatchLabels: map[string]string{"foo": "bar"},
				},
				Template: corev1.PodTemplateSpec{
					ObjectMeta: metav1.ObjectMeta{Labels: map[string]string{"foo": "bar"}},
					Spec:       corev1.PodSpec{Containers: []corev1.Container{{Name: "nginx", Image: "nginx"}}},
				},
			},
		}

		var err error
		dep, err = clientset.AppsV1().Deployments(ns).Create(ctx, dep, metav1.CreateOptions{})
		Expect(err).NotTo(HaveOccurred())
	})

	AfterEach(func() {
		deleteDeployment(ctx, dep, ns)
	})

	It("should successfully Get an object", func() {
		name := types.NamespacedName{Namespace: ns, Name: dep.Name}
		result := &appsv1.Deployment{}

		Expect(getClient().Get(ctx, name, result)).NotTo(HaveOccurred())
		Expect(result).To(BeEquivalentTo(dep))
	})

	It("should successfully List objects", func() {
		result := &appsv1.DeploymentList{}
		opts := client.MatchingLabels(dep.Labels)

		Expect(getClient().List(ctx, result, opts)).NotTo(HaveOccurred())

		Expect(len(result.Items)).To(BeEquivalentTo(1))
		Expect(result.Items[0]).To(BeEquivalentTo(*dep))
	})

	It("should not create an object", func() {
		newDep := dep.DeepCopy()
		newDep.Name = "new-deployment"

		Expect(getClient().Create(ctx, newDep)).ToNot(HaveOccurred())

		_, err := clientset.AppsV1().Deployments(ns).Get(ctx, newDep.Name, metav1.GetOptions{})
		Expect(apierrors.IsNotFound(err)).To(BeTrue())
	})

	It("should not create an object with opts", func() {
		newDep := dep.DeepCopy()
		newDep.Name = "new-deployment"
		opts := &client.CreateOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Create(ctx, newDep, opts)).ToNot(HaveOccurred())

		_, err := clientset.AppsV1().Deployments(ns).Get(ctx, newDep.Name, metav1.GetOptions{})
		Expect(apierrors.IsNotFound(err)).To(BeTrue())
	})

	It("should refuse a create request for an invalid object", func() {
		changedDep := dep.DeepCopy()
		changedDep.Spec.Template.Spec.Containers = nil

		err := getClient().Create(ctx, changedDep)
		Expect(apierrors.IsInvalid(err)).To(BeTrue())
	})

	It("should not change objects via update", func() {
		changedDep := dep.DeepCopy()
		*changedDep.Spec.Replicas = 2

		Expect(getClient().Update(ctx, changedDep)).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via update with opts", func() {
		changedDep := dep.DeepCopy()
		*changedDep.Spec.Replicas = 2
		opts := &client.UpdateOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Update(ctx, changedDep, opts)).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should refuse an update request for an invalid change", func() {
		changedDep := dep.DeepCopy()
		changedDep.Spec.Template.Spec.Containers = nil

		err := getClient().Update(ctx, changedDep)
		Expect(apierrors.IsInvalid(err)).To(BeTrue())
	})

	It("should not change objects via patch", func() {
		changedDep := dep.DeepCopy()
		*changedDep.Spec.Replicas = 2

		Expect(getClient().Patch(ctx, changedDep, client.MergeFrom(dep))).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via patch with opts", func() {
		changedDep := dep.DeepCopy()
		*changedDep.Spec.Replicas = 2
		opts := &client.PatchOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Patch(ctx, changedDep, client.MergeFrom(dep), opts)).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not delete objects", func() {
		Expect(getClient().Delete(ctx, dep)).NotTo(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not delete objects with opts", func() {
		opts := &client.DeleteOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Delete(ctx, dep, opts)).NotTo(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not delete objects via deleteAllOf", func() {
		opts := []client.DeleteAllOfOption{client.InNamespace(ns), client.MatchingLabels(dep.Labels)}

		Expect(getClient().DeleteAllOf(ctx, dep, opts...)).NotTo(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via update status", func() {
		changedDep := dep.DeepCopy()
		changedDep.Status.Replicas = 99

		Expect(getClient().Status().Update(ctx, changedDep)).NotTo(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via update status with opts", func() {
		changedDep := dep.DeepCopy()
		changedDep.Status.Replicas = 99
		opts := &client.UpdateOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Status().Update(ctx, changedDep, opts)).NotTo(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via status patch", func() {
		changedDep := dep.DeepCopy()
		changedDep.Status.Replicas = 99

		Expect(getClient().Status().Patch(ctx, changedDep, client.MergeFrom(dep))).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})

	It("should not change objects via status patch with opts", func() {
		changedDep := dep.DeepCopy()
		changedDep.Status.Replicas = 99

		opts := &client.PatchOptions{DryRun: []string{"Bye", "Pippa"}}

		Expect(getClient().Status().Patch(ctx, changedDep, client.MergeFrom(dep), opts)).ToNot(HaveOccurred())

		actual, err := clientset.AppsV1().Deployments(ns).Get(ctx, dep.Name, metav1.GetOptions{})
		Expect(err).NotTo(HaveOccurred())
		Expect(actual).NotTo(BeNil())
		Expect(actual).To(BeEquivalentTo(dep))
	})
})