/*
Copyright 2022 The Flux 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 controller

import (
	"context"
	"fmt"
	"strings"
	"testing"
	"time"

	"github.com/fluxcd/pkg/apis/meta"
	"github.com/fluxcd/pkg/testserver"
	sourcev1 "github.com/fluxcd/source-controller/api/v1"
	. "github.com/onsi/gomega"
	apimeta "k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"sigs.k8s.io/controller-runtime/pkg/client"

	kustomizev1 "github.com/fluxcd/kustomize-controller/api/v1"
)

func TestKustomizationReconciler_ArtifactDownload(t *testing.T) {
	g := NewWithT(t)
	id := "fetch-" + randStringRunes(5)
	revision := "v1.0.0"

	err := createNamespace(id)
	g.Expect(err).NotTo(HaveOccurred(), "failed to create test namespace")

	err = createKubeConfigSecret(id)
	g.Expect(err).NotTo(HaveOccurred(), "failed to create kubeconfig secret")

	manifests := func(name string, data string) []testserver.File {
		return []testserver.File{
			{
				Name: "secret.yaml",
				Body: fmt.Sprintf(`---
apiVersion: v1
kind: Secret
metadata:
  name: %[1]s
stringData:
  key: "%[2]s"
`, name, data),
			},
		}
	}

	artifact, err := testServer.ArtifactFromFiles(manifests(id, randStringRunes(5)))
	g.Expect(err).NotTo(HaveOccurred(), "failed to create artifact from files")

	repositoryName := types.NamespacedName{
		Name:      fmt.Sprintf("fetch-%s", randStringRunes(5)),
		Namespace: id,
	}

	err = applyGitRepository(repositoryName, artifact, revision)
	g.Expect(err).NotTo(HaveOccurred())

	kustomizationKey := types.NamespacedName{
		Name:      fmt.Sprintf("fetch-%s", randStringRunes(5)),
		Namespace: id,
	}
	kustomization := &kustomizev1.Kustomization{
		ObjectMeta: metav1.ObjectMeta{
			Name:      kustomizationKey.Name,
			Namespace: kustomizationKey.Namespace,
		},
		Spec: kustomizev1.KustomizationSpec{
			Interval: metav1.Duration{Duration: reconciliationInterval},
			Path:     "./",
			KubeConfig: &meta.KubeConfigReference{
				SecretRef: meta.SecretKeyReference{
					Name: "kubeconfig",
				},
			},
			SourceRef: kustomizev1.CrossNamespaceSourceReference{
				Name:      repositoryName.Name,
				Namespace: repositoryName.Namespace,
				Kind:      sourcev1.GitRepositoryKind,
			},
			HealthChecks: []meta.NamespacedObjectKindReference{
				{
					APIVersion: "v1",
					Kind:       "Secret",
					Name:       id,
					Namespace:  id,
				},
			},
			TargetNamespace: id,
			Force:           false,
		},
	}

	g.Expect(k8sClient.Create(context.Background(), kustomization)).To(Succeed())

	resultK := &kustomizev1.Kustomization{}
	repo := &sourcev1.GitRepository{
		TypeMeta: metav1.TypeMeta{
			Kind:       sourcev1.GitRepositoryKind,
			APIVersion: sourcev1.GroupVersion.String(),
		},
	}
	g.Expect(k8sClient.Get(context.Background(), repositoryName, repo)).Should(Succeed())
	repoURL := repo.Status.Artifact.URL

	t.Run("downloads artifact", func(t *testing.T) {
		g.Eventually(func() bool {
			_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), resultK)
			return apimeta.IsStatusConditionTrue(resultK.Status.Conditions, meta.ReadyCondition) &&
				resultK.Status.LastAppliedRevision == revision
		}, timeout, time.Second).Should(BeTrue())
	})

	t.Run("retries on not found errors", func(t *testing.T) {
		repo.Status.Artifact.URL = repoURL + "not-found"
		repo.ManagedFields = nil
		g.Expect(k8sClient.Status().Update(context.Background(), repo)).To(Succeed())

		g.Eventually(func() bool {
			_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), resultK)
			ready := apimeta.FindStatusCondition(resultK.Status.Conditions, meta.ReadyCondition)
			return strings.Contains(ready.Message, "artifact not found")
		}, timeout, time.Second).Should(BeTrue())
	})

	t.Run("recovers after not found errors", func(t *testing.T) {
		g.Expect(k8sClient.Get(context.Background(), repositoryName, repo)).Should(Succeed())
		repo.Status.Artifact.URL = repoURL
		repo.ManagedFields = nil
		g.Expect(k8sClient.Status().Update(context.Background(), repo)).To(Succeed())

		g.Eventually(func() bool {
			_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), resultK)
			return apimeta.IsStatusConditionTrue(resultK.Status.Conditions, meta.ReadyCondition)
		}, timeout, time.Second).Should(BeTrue())
	})
}