/*
Copyright © 2022 SUSE LLC

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 controllers

import (
	"context"
	"errors"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	elementalv1 "github.com/rancher/elemental-operator/api/v1beta1"
	"github.com/rancher/elemental-operator/pkg/test"
	managementv3 "github.com/rancher/rancher/pkg/apis/management.cattle.io/v3"
	corev1 "k8s.io/api/core/v1"
	rbacv1 "k8s.io/api/rbac/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/utils/pointer"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
	"sigs.k8s.io/controller-runtime/pkg/reconcile"
)

var _ = Describe("reconcile machine registration", func() {
	var r *MachineRegistrationReconciler
	var mRegistration *elementalv1.MachineRegistration
	var setting *managementv3.Setting

	BeforeEach(func() {
		r = &MachineRegistrationReconciler{
			Client: cl,
		}

		mRegistration = &elementalv1.MachineRegistration{
			ObjectMeta: metav1.ObjectMeta{
				Name:      "test-name",
				Namespace: "default",
			},
		}

		setting = &managementv3.Setting{
			ObjectMeta: metav1.ObjectMeta{
				Name: "server-url",
			},
			Value: "https://example.com",
		}

		Expect(cl.Create(ctx, mRegistration)).To(Succeed())

		Expect(cl.Create(ctx, setting)).To(Succeed())
	})

	AfterEach(func() {
		Expect(test.CleanupAndWait(ctx, cl, mRegistration, setting)).To(Succeed())
	})

	It("should reconcile machine registration object", func() {
		_, err := r.Reconcile(ctx, reconcile.Request{
			NamespacedName: types.NamespacedName{
				Namespace: mRegistration.Namespace,
				Name:      mRegistration.Name,
			},
		})
		Expect(err).ToNot(HaveOccurred())

		Expect(cl.Get(ctx, client.ObjectKey{
			Name:      mRegistration.Name,
			Namespace: mRegistration.Namespace,
		}, mRegistration)).To(Succeed())

		Expect(mRegistration.Finalizers).To(HaveLen(1))
		Expect(mRegistration.Finalizers[0]).To(Equal(elementalv1.MachineRegistrationFinalizer))
		Expect(mRegistration.Status.RegistrationToken).ToNot(BeEmpty())
		Expect(mRegistration.Status.RegistrationURL).To(ContainSubstring("https://example.com/elemental/registration/"))
		Expect(mRegistration.Status.ServiceAccountRef.Kind).To(Equal("ServiceAccount"))
		Expect(mRegistration.Status.ServiceAccountRef.Name).To(Equal(mRegistration.Name))
		Expect(mRegistration.Status.ServiceAccountRef.Namespace).To(Equal(mRegistration.Namespace))
		Expect(mRegistration.Status.Conditions).To(HaveLen(1))
		Expect(mRegistration.Status.Conditions[0].Type).To(Equal(elementalv1.ReadyCondition))
		Expect(mRegistration.Status.Conditions[0].Reason).To(Equal(elementalv1.SuccefullyCreatedReason))
		Expect(mRegistration.Status.Conditions[0].Status).To(Equal(metav1.ConditionTrue))

		objKey := types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		Expect(r.Get(ctx, objKey, &rbacv1.Role{})).To(Succeed())
		Expect(r.Get(ctx, objKey, &corev1.ServiceAccount{})).To(Succeed())
		Expect(r.Get(ctx, objKey, &rbacv1.RoleBinding{})).To(Succeed())
		Expect(r.Get(ctx, types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name + "-token"}, &corev1.Secret{})).To(Succeed())
	})

	It("should reconcile machine registration object with a deletion timestamp", func() {
		req := reconcile.Request{
			NamespacedName: types.NamespacedName{
				Namespace: mRegistration.Namespace,
				Name:      mRegistration.Name,
			},
		}
		_, err := r.Reconcile(ctx, req)
		Expect(err).ToNot(HaveOccurred())

		Expect(cl.Delete(ctx, mRegistration)).To(Succeed())

		_, err = r.Reconcile(ctx, req)
		Expect(err).ToNot(HaveOccurred())

		Expect(mRegistration.Finalizers).To(HaveLen(0))
		objKey := types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		Expect(r.Get(ctx, objKey, &rbacv1.Role{})).ToNot(Succeed())
		Expect(r.Get(ctx, objKey, &corev1.ServiceAccount{})).ToNot(Succeed())
		Expect(r.Get(ctx, objKey, &rbacv1.RoleBinding{})).ToNot(Succeed())
		Expect(r.Get(ctx, types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name + "-token"}, &corev1.Secret{})).ToNot(Succeed())
	})
})

var _ = Describe("setRegistrationTokenAndURL", func() {
	var r *MachineRegistrationReconciler
	var mRegistration *elementalv1.MachineRegistration

	BeforeEach(func() {
		r = &MachineRegistrationReconciler{
			Client: cl,
		}

		mRegistration = &elementalv1.MachineRegistration{
			ObjectMeta: metav1.ObjectMeta{
				Name:      "test-name",
				Namespace: "default",
			},
		}
	})

	It("should successfully set registration token and url", func() {
		setting := &managementv3.Setting{
			ObjectMeta: metav1.ObjectMeta{
				Name: "server-url",
			},
			Value: "https://example.com",
		}
		Expect(cl.Create(ctx, setting)).To(Succeed())
		Expect(r.setRegistrationTokenAndURL(ctx, mRegistration)).To(Succeed())
		Expect(mRegistration.Status.RegistrationToken).ToNot(BeEmpty())
		Expect(mRegistration.Status.RegistrationURL).To(ContainSubstring("https://example.com/elemental/registration/"))
		Expect(test.CleanupAndWait(ctx, cl, setting)).To(Succeed())
	})

	It("should return error when setting doesn't exist", func() {
		err := r.setRegistrationTokenAndURL(ctx, mRegistration)
		Expect(err).To(HaveOccurred())
		Expect(err.Error()).To(ContainSubstring("failed to get server url setting"))
	})

	It("should return error when setting doesn't have a value", func() {
		setting := &managementv3.Setting{
			ObjectMeta: metav1.ObjectMeta{
				Name: "server-url",
			},
		}
		Expect(cl.Create(ctx, setting)).To(Succeed())
		err := r.setRegistrationTokenAndURL(ctx, mRegistration)
		Expect(err).To(HaveOccurred())
		Expect(err.Error()).To(ContainSubstring("server-url is not set"))
		Expect(test.CleanupAndWait(ctx, cl, setting)).To(Succeed())
	})
})

var _ = Describe("createRBACObjects", func() {
	var r *MachineRegistrationReconciler
	var mRegistration *elementalv1.MachineRegistration
	var role *rbacv1.Role
	var sa *corev1.ServiceAccount
	var secret *corev1.Secret
	var roleBinding *rbacv1.RoleBinding

	BeforeEach(func() {
		r = &MachineRegistrationReconciler{
			Client: cl,
		}

		mRegistration = &elementalv1.MachineRegistration{
			ObjectMeta: metav1.ObjectMeta{
				Name:      "test-name",
				Namespace: "default",
				UID:       "test",
			},
		}

		objMeta := metav1.ObjectMeta{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		role = &rbacv1.Role{ObjectMeta: objMeta}
		sa = &corev1.ServiceAccount{ObjectMeta: objMeta}
		roleBinding = &rbacv1.RoleBinding{
			ObjectMeta: objMeta,
			RoleRef: rbacv1.RoleRef{
				Kind:     "Role",
				Name:     mRegistration.Name,
				APIGroup: "rbac.authorization.k8s.io",
			},
		}
		secret = &corev1.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Namespace: mRegistration.Namespace,
				Name:      mRegistration.Name + "-token",
			},
		}
	})

	AfterEach(func() {
		test.CleanupAndWait(ctx, cl, role, sa, roleBinding, secret)
	})

	It("should successfully create RBAC objects", func() {
		Expect(r.createRBACObjects(ctx, mRegistration)).To(Succeed())
		objKey := types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		role := &rbacv1.Role{}
		Expect(r.Get(ctx, objKey, role)).To(Succeed())

		Expect(role.OwnerReferences).To(HaveLen(1))
		Expect(role.OwnerReferences[0].APIVersion).To(Equal(elementalv1.GroupVersion.String()))
		Expect(role.OwnerReferences[0].Kind).To(Equal("MachineRegistration"))
		Expect(role.OwnerReferences[0].Name).To(Equal(mRegistration.Name))
		Expect(role.OwnerReferences[0].UID).To(Equal(mRegistration.UID))
		Expect(role.OwnerReferences[0].Controller).To(Equal(pointer.Bool(true)))
		Expect(role.Labels).To(HaveKey(elementalv1.ElementalManagedLabel))

		Expect(role.Rules).To(HaveLen(2))
		Expect(role.Rules[0].APIGroups).To(Equal([]string{""}))
		Expect(role.Rules[0].Verbs).To(Equal([]string{"get", "watch", "list", "update", "patch"}))
		Expect(role.Rules[0].Resources).To(Equal([]string{"secrets"}))
		Expect(role.Rules[1].APIGroups).To(Equal([]string{"management.cattle.io"}))
		Expect(role.Rules[1].Verbs).To(Equal([]string{"get", "watch", "list"}))
		Expect(role.Rules[1].Resources).To(Equal([]string{"settings"}))

		sa := &corev1.ServiceAccount{}
		Expect(r.Get(ctx, objKey, sa)).To(Succeed())
		Expect(sa.OwnerReferences).To(HaveLen(1))
		Expect(sa.OwnerReferences[0].APIVersion).To(Equal(elementalv1.GroupVersion.String()))
		Expect(sa.OwnerReferences[0].Kind).To(Equal("MachineRegistration"))
		Expect(sa.OwnerReferences[0].Name).To(Equal(mRegistration.Name))
		Expect(sa.OwnerReferences[0].UID).To(Equal(mRegistration.UID))
		Expect(sa.OwnerReferences[0].Controller).To(Equal(pointer.Bool(true)))
		Expect(sa.Labels).To(HaveKey(elementalv1.ElementalManagedLabel))

		secret := &corev1.Secret{}
		Expect(r.Get(ctx, types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name + "-token"}, secret)).To(Succeed())
		Expect(secret.OwnerReferences).To(HaveLen(1))
		Expect(secret.OwnerReferences[0].APIVersion).To(Equal(elementalv1.GroupVersion.String()))
		Expect(secret.OwnerReferences[0].Kind).To(Equal("MachineRegistration"))
		Expect(secret.OwnerReferences[0].Name).To(Equal(mRegistration.Name))
		Expect(secret.OwnerReferences[0].UID).To(Equal(mRegistration.UID))
		Expect(secret.OwnerReferences[0].Controller).To(Equal(pointer.Bool(true)))
		Expect(secret.Labels).To(HaveKey(elementalv1.ElementalManagedLabel))
		Expect(secret.Annotations).To(HaveKeyWithValue("kubernetes.io/service-account.name", mRegistration.Name))
		Expect(secret.Type).To(Equal(corev1.SecretTypeServiceAccountToken))

		roleBinding := &rbacv1.RoleBinding{}
		Expect(r.Get(ctx, objKey, roleBinding)).To(Succeed())
		Expect(roleBinding.OwnerReferences).To(HaveLen(1))
		Expect(roleBinding.OwnerReferences[0].APIVersion).To(Equal(elementalv1.GroupVersion.String()))
		Expect(roleBinding.OwnerReferences[0].Kind).To(Equal("MachineRegistration"))
		Expect(roleBinding.OwnerReferences[0].Name).To(Equal(mRegistration.Name))
		Expect(roleBinding.OwnerReferences[0].UID).To(Equal(mRegistration.UID))
		Expect(roleBinding.OwnerReferences[0].Controller).To(Equal(pointer.Bool(true)))
		Expect(roleBinding.Labels).To(HaveKey(elementalv1.ElementalManagedLabel))

		Expect(roleBinding.Subjects).To(HaveLen(1))
		Expect(roleBinding.Subjects[0].Kind).To(Equal("ServiceAccount"))
		Expect(roleBinding.Subjects[0].Name).To(Equal(mRegistration.Name))
		Expect(roleBinding.Subjects[0].Namespace).To(Equal(mRegistration.Namespace))

		Expect(mRegistration.Status.ServiceAccountRef.Kind).To(Equal("ServiceAccount"))
		Expect(mRegistration.Status.ServiceAccountRef.Name).To(Equal(mRegistration.Name))
		Expect(mRegistration.Status.ServiceAccountRef.Namespace).To(Equal(mRegistration.Namespace))

	})

	It("shouldn't error when RBAC already exists", func() {
		Expect(r.Create(ctx, role)).To(Succeed())
		Expect(r.Create(ctx, sa)).To(Succeed())
		Expect(r.Create(ctx, roleBinding)).To(Succeed())
		Expect(r.Create(ctx, secret)).To(Succeed())
		Expect(r.createRBACObjects(ctx, mRegistration)).To(Succeed())
		Expect(mRegistration.Status.ServiceAccountRef.Kind).To(Equal("ServiceAccount"))
		Expect(mRegistration.Status.ServiceAccountRef.Name).To(Equal(mRegistration.Name))
		Expect(mRegistration.Status.ServiceAccountRef.Namespace).To(Equal(mRegistration.Namespace))
	})

	It("should error when RBAC fails to be created", func() {
		r.Client = machineRegistrationFailingClient{}
		err := r.createRBACObjects(ctx, mRegistration)
		Expect(err).To(HaveOccurred())
		Expect(err.Error()).To(ContainSubstring("failed to create"))
	})
})

var _ = Describe("reconcileDelete", func() {
	var r *MachineRegistrationReconciler
	var mRegistration *elementalv1.MachineRegistration
	var role *rbacv1.Role
	var sa *corev1.ServiceAccount
	var roleBinding *rbacv1.RoleBinding
	var secret *corev1.Secret

	BeforeEach(func() {
		r = &MachineRegistrationReconciler{
			Client: cl,
		}

		mRegistration = &elementalv1.MachineRegistration{
			ObjectMeta: metav1.ObjectMeta{
				Name:      "test-name",
				Namespace: "default",
				UID:       "test",
			},
		}

		objMeta := metav1.ObjectMeta{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		role = &rbacv1.Role{ObjectMeta: objMeta}
		sa = &corev1.ServiceAccount{ObjectMeta: objMeta}
		roleBinding = &rbacv1.RoleBinding{
			ObjectMeta: objMeta,
			RoleRef: rbacv1.RoleRef{
				Kind:     "Role",
				Name:     mRegistration.Name,
				APIGroup: "rbac.authorization.k8s.io",
			},
		}
		secret = &corev1.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Namespace: mRegistration.Namespace,
				Name:      mRegistration.Name + "-token",
			},
		}
	})

	AfterEach(func() {
		test.CleanupAndWait(ctx, cl, role, sa, roleBinding, secret)
	})

	It("should successfully delete RBAC objects", func() {
		controllerutil.AddFinalizer(mRegistration, elementalv1.MachineRegistrationFinalizer)
		Expect(r.createRBACObjects(ctx, mRegistration)).To(Succeed())
		_, err := r.reconcileDelete(ctx, mRegistration)
		Expect(err).ToNot(HaveOccurred())
		objKey := types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name}
		Expect(r.Get(ctx, objKey, &rbacv1.Role{})).ToNot(Succeed())
		Expect(r.Get(ctx, objKey, &corev1.ServiceAccount{})).ToNot(Succeed())
		Expect(r.Get(ctx, objKey, &rbacv1.RoleBinding{})).ToNot(Succeed())
		Expect(r.Get(ctx, types.NamespacedName{Namespace: mRegistration.Namespace, Name: mRegistration.Name + "-token"}, &corev1.Secret{})).ToNot(Succeed())
		Expect(mRegistration.Finalizers).To(HaveLen(0))
	})

	It("shouldn't error when RBAC already deleted", func() {
		Expect(r.createRBACObjects(ctx, mRegistration)).To(Succeed())
		_, err := r.reconcileDelete(ctx, mRegistration)
		Expect(err).ToNot(HaveOccurred())
		_, err = r.reconcileDelete(ctx, mRegistration)
		Expect(err).ToNot(HaveOccurred())
	})

	It("should error when RBAC fails to be deleted", func() {
		r.Client = machineRegistrationFailingClient{}
		_, err := r.reconcileDelete(ctx, mRegistration)
		Expect(err).To(HaveOccurred())
		Expect(err.Error()).To(ContainSubstring("failed to delete"))
	})
})

type machineRegistrationFailingClient struct {
	client.Client
}

func (cl machineRegistrationFailingClient) Create(ctx context.Context, obj client.Object, opts ...client.CreateOption) error {
	return errors.New("failed to create")
}

func (cl machineRegistrationFailingClient) Delete(ctx context.Context, obj client.Object, opts ...client.DeleteOption) error {
	return errors.New("failed to delete")
}