/*
Copyright 2025.

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 v1

import (
	"context"

	netbirdiov1 "github.com/netbirdio/kubernetes-operator/api/v1"
	nbv1alpha1 "github.com/netbirdio/kubernetes-operator/api/v1alpha1"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

var _ = Describe("Pod Webhook", func() {
	var (
		obj       *corev1.Pod
		defaulter PodNetbirdInjector
	)

	BeforeEach(func() {
		obj = &corev1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:        "test",
				Namespace:   "test",
				Annotations: make(map[string]string),
			},
			Spec: corev1.PodSpec{
				Containers: []corev1.Container{
					{
						Name: "test",
					},
				},
			},
		}
		defaulter = PodNetbirdInjector{
			client:        k8sClient,
			managementURL: "https://api.netbird.io",
			clientImage:   "netbirdio/netbird:latest",
		}
		Expect(defaulter).NotTo(BeNil(), "Expected defaulter to be initialized")
		Expect(obj).NotTo(BeNil(), "Expected obj to be initialized")
	})

	AfterEach(func() {
	})

	Context("When creating Pod without annotation", func() {
		It("Should not modify anything", func() {
			err := defaulter.Default(context.Background(), obj)
			Expect(err).NotTo(HaveOccurred())
			Expect(obj.Spec.Containers).To(HaveLen(1))
		})
	})

	Context("When creating Pod with annotation", func() {
		BeforeEach(func() {
			obj.Annotations[setupKeyAnnotation] = "test"
		})

		When("NBSetupKey doesn't exist", func() {
			It("Should fail", func() {
				Expect(defaulter.Default(context.Background(), obj)).To(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(1))
			})
		})

		When("NBSetupKey exists", Ordered, func() {
			BeforeAll(func() {
				sk := netbirdiov1.NBSetupKey{
					ObjectMeta: metav1.ObjectMeta{
						Name:      "test",
						Namespace: "test",
					},
					Spec: netbirdiov1.NBSetupKeySpec{
						SecretKeyRef: corev1.SecretKeySelector{
							LocalObjectReference: corev1.LocalObjectReference{
								Name: "test",
							},
							Key: "test",
						},
					},
				}

				err := k8sClient.Create(context.Background(), &corev1.Namespace{
					ObjectMeta: metav1.ObjectMeta{
						Name: "test",
					},
				})
				Expect(err).NotTo(HaveOccurred())

				err = k8sClient.Create(context.Background(), &sk)
				Expect(err).NotTo(HaveOccurred())

				sk.Status = netbirdiov1.NBSetupKeyStatus{
					Conditions: []netbirdiov1.NBCondition{
						{
							Type:   netbirdiov1.NBSetupKeyReady,
							Status: corev1.ConditionTrue,
						},
					},
				}

				err = k8sClient.Status().Update(context.Background(), &sk)
				Expect(err).NotTo(HaveOccurred())
			})

			It("Should inject NB container", func() {
				Expect(defaulter.Default(context.Background(), obj)).NotTo(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(2))
				Expect(obj.Spec.Containers[1].Name).To(Equal("netbird"))
			})

			It("Should inject NB container as native sidecar when init-sidecar annotation is true", func() {
				obj.Annotations[sidecarAnnotation] = "true"
				Expect(defaulter.Default(context.Background(), obj)).NotTo(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(1), "original containers should be unchanged")
				Expect(obj.Spec.InitContainers).To(HaveLen(1))
				Expect(obj.Spec.InitContainers[0].Name).To(Equal("netbird"))
				Expect(obj.Spec.InitContainers[0].RestartPolicy).NotTo(BeNil())
				Expect(*obj.Spec.InitContainers[0].RestartPolicy).To(Equal(corev1.ContainerRestartPolicyAlways))
			})

			It("Should inject NB as regular container when init-sidecar annotation is false", func() {
				obj.Annotations[sidecarAnnotation] = "false"
				Expect(defaulter.Default(context.Background(), obj)).NotTo(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(2))
				Expect(obj.Spec.Containers[1].Name).To(Equal("netbird"))
				Expect(obj.Spec.InitContainers).To(BeEmpty())
			})

			It("Should inject NB as regular container when init-sidecar annotation is absent", func() {
				delete(obj.Annotations, sidecarAnnotation)
				Expect(defaulter.Default(context.Background(), obj)).NotTo(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(2))
				Expect(obj.Spec.Containers[1].Name).To(Equal("netbird"))
				Expect(obj.Spec.InitContainers).To(BeEmpty())
			})

		})
	})

	Context("When creating Pod with SidecarProfile", func() {
		BeforeEach(func() {
			sidecarProfile := &nbv1alpha1.SidecarProfile{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "test",
					Namespace: "test",
				},
				Spec: nbv1alpha1.SidecarProfileSpec{
					SetupKeyRef: corev1.LocalObjectReference{
						Name: "test",
					},
					InjectionMode: nbv1alpha1.InjectionModeContainer,
				},
			}
			Expect(k8sClient.Create(context.Background(), sidecarProfile)).To(Succeed())
		})

		AfterEach(func() {
			sidecarProfile := &nbv1alpha1.SidecarProfile{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "test",
					Namespace: "test",
				},
			}
			Expect(k8sClient.Delete(ctx, sidecarProfile)).To(Succeed())
		})

		When("SetupKey doesn't exist", func() {
			It("Should fail", func() {
				Expect(defaulter.Default(context.Background(), obj)).To(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(1))
			})
		})

		When("SetupKey exists", func() {
			It("Should succeed", func() {
				setupKey := &nbv1alpha1.SetupKey{
					ObjectMeta: metav1.ObjectMeta{
						Name:      "test",
						Namespace: "test",
					},
					Spec: nbv1alpha1.SetupKeySpec{
						Name:      "test",
						Ephemeral: true,
					},
				}
				Expect(k8sClient.Create(context.Background(), setupKey)).To(Succeed())

				Expect(defaulter.Default(context.Background(), obj)).NotTo(HaveOccurred())
				Expect(obj.Spec.Containers).To(HaveLen(2))
				Expect(obj.Spec.Containers[1].Name).To(Equal("netbird"))
			})
		})
	})
})