/*
Copyright 2020 The Knative 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 v1

import (
	"context"
	"fmt"
	"testing"

	"k8s.io/apimachinery/pkg/api/errors"
	eventingv1 "knative.dev/eventing/pkg/apis/eventing/v1"

	"gotest.tools/v3/assert"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	clienttesting "k8s.io/client-go/testing"
	v1 "knative.dev/eventing/pkg/apis/sources/v1"
	fake "knative.dev/eventing/pkg/client/clientset/versioned/typed/sources/v1/fake"
	duckv1 "knative.dev/pkg/apis/duck/v1"
)

func setupFakeContainerSourcesClient() (fakeSvr fake.FakeSourcesV1, client KnContainerSourcesClient) {
	fakeE := fake.FakeSourcesV1{Fake: &clienttesting.Fake{}}
	cli := NewKnSourcesClient(&fakeE, "test-ns").ContainerSourcesClient()
	return fakeE, cli
}

func TestDeleteContainerSourceSource(t *testing.T) {
	sourcesServer, client := setupFakeContainerSourcesClient()

	sourcesServer.AddReactor("delete", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			name := a.(clienttesting.DeleteAction).GetName()
			fmt.Printf("name=%s \n", name)
			if name == "errorSource" {
				return true, nil, fmt.Errorf("error while deleting ContainerSource source %s", name)
			}
			return true, nil, nil
		})

	err := client.DeleteContainerSource("foo", context.Background())
	assert.NilError(t, err)

	err = client.DeleteContainerSource("errorSource", context.Background())
	assert.ErrorContains(t, err, "errorSource")
}

func TestCreateContainerSourceSource(t *testing.T) {
	sourcesServer, client := setupFakeContainerSourcesClient()

	sourcesServer.AddReactor("create", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			newSource := a.(clienttesting.CreateAction).GetObject()
			name := newSource.(metav1.Object).GetName()
			if name == "errorSource" {
				return true, nil, fmt.Errorf("error while creating ContainerSource source %s", name)
			}
			return true, newSource, nil
		})
	err := client.CreateContainerSource(context.Background(), newContainerSource("foo", "Event"))
	assert.NilError(t, err)

	err = client.CreateContainerSource(context.Background(), newContainerSource("errorSource", "Event"))
	assert.ErrorContains(t, err, "errorSource")

}

func TestGetContainerSource(t *testing.T) {
	sourcesServer, client := setupFakeContainerSourcesClient()

	sourcesServer.AddReactor("get", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			name := a.(clienttesting.GetAction).GetName()
			if name == "errorSource" {
				return true, nil, fmt.Errorf("error while getting Container source %s", name)
			}
			return true, newContainerSource(name, "Event"), nil
		})
	testsource, err := client.GetContainerSource(context.Background(), "foo")
	assert.NilError(t, err)
	assert.Equal(t, testsource.Name, "foo")
	assert.Equal(t, testsource.Spec.Sink.Ref.Name, "foosvc")

	_, err = client.GetContainerSource(context.Background(), "errorSource")
	assert.ErrorContains(t, err, "errorSource")
}

func TestUpdateContainerSource(t *testing.T) {
	sourcesServer, client := setupFakeContainerSourcesClient()

	sourcesServer.AddReactor("update", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			updatedSource := a.(clienttesting.UpdateAction).GetObject()
			name := updatedSource.(metav1.Object).GetName()
			if name == "errorSource" {
				return true, nil, fmt.Errorf("error while updating Container source %s", name)
			}
			return true, NewContainerSourceBuilderFromExisting(updatedSource.(*v1.ContainerSource)).Build(), nil
		})
	err := client.UpdateContainerSource(context.Background(), newContainerSource("foo", "Event"))
	assert.NilError(t, err)

	err = client.UpdateContainerSource(context.Background(), newContainerSource("errorSource", "Event"))
	assert.ErrorContains(t, err, "errorSource")
}

func TestUpdateContainerSourceWithRetry(t *testing.T) {
	serving, client := setupFakeContainerSourcesClient()

	sourceName := "foo"

	var attemptCount, maxAttempts = 0, 5
	serving.AddReactor("get", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			name := a.(clienttesting.GetAction).GetName()
			if name == "deletedDomain" {
				domain := newContainerSource(name, "Event")
				now := metav1.Now()
				domain.DeletionTimestamp = &now
				return true, domain, nil
			}
			if name == "getErrorSource" {
				return true, nil, errors.NewInternalError(fmt.Errorf("mock internal error"))
			}
			return true, newContainerSource(name, "Event"), nil
		})

	serving.AddReactor("update", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			newContainerSource := a.(clienttesting.UpdateAction).GetObject()
			name := newContainerSource.(metav1.Object).GetName()

			if name == sourceName && attemptCount > 0 {
				attemptCount--
				return true, nil, errors.NewConflict(eventingv1.Resource("containersources"), "errorDomain", fmt.Errorf("error updating because of conflict"))
			}
			if name == "errorDomain" {
				return true, nil, errors.NewInternalError(fmt.Errorf("mock internal error"))
			}
			return true, newContainerSource, nil
		})

	// Update container source successfully without any retries
	err := client.UpdateContainerSourceWithRetry(context.Background(), sourceName, func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.NilError(t, err, "No retries required as no conflict error occurred")

	// Update container source with retry after max retries
	attemptCount = maxAttempts - 1
	err = client.UpdateContainerSourceWithRetry(context.Background(), sourceName, func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.NilError(t, err, "Update retried %d times and succeeded", maxAttempts)
	assert.Equal(t, attemptCount, 0)

	// Update container source with retry and fail with conflict after exhausting max retries
	attemptCount = maxAttempts
	err = client.UpdateContainerSourceWithRetry(context.Background(), sourceName, func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.ErrorType(t, err, errors.IsConflict, "Update retried %d times and failed", maxAttempts)
	assert.Equal(t, attemptCount, 0)

	// Update container source with retry and fail with conflict after exhausting max retries
	attemptCount = maxAttempts
	err = client.UpdateContainerSourceWithRetry(context.Background(), sourceName, func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.ErrorType(t, err, errors.IsConflict, "Update retried %d times and failed", maxAttempts)
	assert.Equal(t, attemptCount, 0)

	// Update container source with retry fails with a non conflict error
	err = client.UpdateContainerSourceWithRetry(context.Background(), "errorDomain", func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.ErrorType(t, err, errors.IsInternalError)

	// Update container source with retry fails with resource already deleted error
	err = client.UpdateContainerSourceWithRetry(context.Background(), "deletedDomain", func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.ErrorContains(t, err, "marked for deletion")

	// Update container source with retry fails with error from updateFunc
	err = client.UpdateContainerSourceWithRetry(context.Background(), sourceName, func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, fmt.Errorf("error updating object")
	}, maxAttempts)
	assert.ErrorContains(t, err, "error updating object")

	// Update container source with retry fails with error from GetContainerSource
	err = client.UpdateContainerSourceWithRetry(context.Background(), "getErrorSource", func(container *v1.ContainerSource) (*v1.ContainerSource, error) {
		return container, nil
	}, maxAttempts)
	assert.ErrorType(t, err, errors.IsInternalError)
}

func TestListContainerSource(t *testing.T) {
	sourcesServer, client := setupFakeContainerSourcesClient()

	sourcesServer.AddReactor("list", "containersources",
		func(a clienttesting.Action) (bool, runtime.Object, error) {
			cJSource := newContainerSource("testsource", "Event")
			return true, &v1.ContainerSourceList{Items: []v1.ContainerSource{*cJSource}}, nil
		})

	sourceList, err := client.ListContainerSources(context.Background())
	assert.NilError(t, err)
	assert.Equal(t, len(sourceList.Items), 1)
}

func newContainerSource(name, container string) *v1.ContainerSource {
	b := NewContainerSourceBuilder(name).
		PodSpec(corev1.PodSpec{}).
		Sink(duckv1.Destination{
			Ref: &duckv1.KReference{
				Kind:      "Service",
				Name:      "foosvc",
				Namespace: "default",
			}})

	return b.Build()
}