//go:build e2e

/*
Copyright 2024 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 e2e_test

import (
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/utils/ptr"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

var _ = Describe("Azure Provider", func() {
	var (
		namespace *corev1.Namespace
	)

	BeforeEach(func() {
		Eventually(allVMSSStable, "10m", "30s").Should(Succeed())

		namespace = &corev1.Namespace{
			ObjectMeta: metav1.ObjectMeta{
				GenerateName: "azure-e2e-",
			},
		}
		Expect(k8s.Create(ctx, namespace)).To(Succeed())
	})

	AfterEach(func() {
		Expect(k8s.Delete(ctx, namespace)).To(Succeed())
		Eventually(func() bool {
			err := k8s.Get(ctx, client.ObjectKeyFromObject(namespace), &corev1.Namespace{})
			return apierrors.IsNotFound(err)
		}, "1m", "5s").Should(BeTrue(), "Namespace "+namespace.Name+" still exists")
	})

	It("scales up AKS node pools when pending Pods exist", func() {
		ensureHelmValues(map[string]interface{}{
			"extraArgs": map[string]interface{}{
				"scale-down-delay-after-add":       "10s",
				"scale-down-unneeded-time":         "10s",
				"scale-down-candidates-pool-ratio": "1.0",
				"unremovable-node-recheck-timeout": "10s",
				"skip-nodes-with-system-pods":      "false",
				"skip-nodes-with-local-storage":    "false",
			},
		})

		nodes := &corev1.NodeList{}
		Expect(k8s.List(ctx, nodes)).To(Succeed())
		nodeCountBefore := len(nodes.Items)

		By("Creating 100 Pods")
		// https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/application/php-apache.yaml
		deploy := &appsv1.Deployment{
			ObjectMeta: metav1.ObjectMeta{
				Name:      "php-apache",
				Namespace: namespace.Name,
			},
			Spec: appsv1.DeploymentSpec{
				Selector: &metav1.LabelSelector{
					MatchLabels: map[string]string{
						"run": "php-apache",
					},
				},
				Replicas: ptr.To[int32](100),
				Template: corev1.PodTemplateSpec{
					ObjectMeta: metav1.ObjectMeta{
						Labels: map[string]string{
							"run": "php-apache",
						},
					},
					Spec: corev1.PodSpec{
						Containers: []corev1.Container{
							{
								Name:  "php-apache",
								Image: "registry.k8s.io/hpa-example",
								Resources: corev1.ResourceRequirements{
									Limits: corev1.ResourceList{
										corev1.ResourceCPU: resource.MustParse("500m"),
									},
									Requests: corev1.ResourceList{
										corev1.ResourceCPU: resource.MustParse("200m"),
									},
								},
							},
						},
					},
				},
			},
		}
		Expect(k8s.Create(ctx, deploy)).To(Succeed())

		By("Waiting for more Ready Nodes to exist")
		Eventually(func() (int, error) {
			readyCount := 0
			nodes := &corev1.NodeList{}
			if err := k8s.List(ctx, nodes); err != nil {
				return 0, err
			}
			for _, node := range nodes.Items {
				for _, cond := range node.Status.Conditions {
					if cond.Type == corev1.NodeReady && cond.Status == corev1.ConditionTrue {
						readyCount++
						break
					}
				}
			}
			return readyCount, nil
		}, "10m", "10s").Should(BeNumerically(">", nodeCountBefore))

		Eventually(allVMSSStable, "10m", "30s").Should(Succeed())

		By("Deleting 100 Pods")
		Expect(k8s.Delete(ctx, deploy)).To(Succeed())

		By("Waiting for the original number of Nodes to be Ready")
		Eventually(func(g Gomega) {
			nodes := &corev1.NodeList{}
			g.Expect(k8s.List(ctx, nodes)).To(Succeed())
			g.Expect(nodes.Items).To(SatisfyAll(
				HaveLen(nodeCountBefore),
				ContainElements(Satisfy(func(node corev1.Node) bool {
					for _, cond := range node.Status.Conditions {
						if cond.Type == corev1.NodeReady && cond.Status == corev1.ConditionTrue {
							return true
						}
					}
					return false
				})),
			))
		}, "20m", "10s").Should(Succeed())
	})
})