/*
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 consistencydetector

import (
	"context"
	"testing"

	"github.com/stretchr/testify/require"

	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/utils/ptr"
)

var (
	emptyListFunc = func(_ context.Context, opts metav1.ListOptions) (*v1.PodList, error) {
		return &v1.PodList{}, nil
	}
	emptyListOptions = metav1.ListOptions{}
)

func TestDriveCheckWatchListFromCacheDataConsistencyIfRequested(t *testing.T) {
	ctx := context.TODO()

	CheckWatchListFromCacheDataConsistencyIfRequested(ctx, "", emptyListFunc, emptyListOptions, &v1.PodList{})
}

func TestDriveCheckListFromCacheDataConsistencyIfRequested(t *testing.T) {
	ctx := context.TODO()

	CheckListFromCacheDataConsistencyIfRequested(ctx, "", emptyListFunc, emptyListOptions, &v1.PodList{})
}

func TestCheckListFromCacheDataConsistencyIfRequestedInternalPanics(t *testing.T) {
	ctx := context.TODO()
	pod := makePod("p1", "1")

	wrappedTarget := func() {
		checkListFromCacheDataConsistencyIfRequestedInternal(ctx, "", emptyListFunc, emptyListOptions, pod)
	}

	require.PanicsWithError(t, "object does not implement the List interfaces", wrappedTarget)
}

func TestCheckListFromCacheDataConsistencyIfRequestedInternalHappyPath(t *testing.T) {
	scenarios := []struct {
		name                 string
		listResponse         runtime.Object
		retrievedList        runtime.Object
		retrievedListOptions metav1.ListOptions

		expectedRequestOptions metav1.ListOptions
	}{
		{
			name: "list detector works with a typed list",
			listResponse: &v1.PodList{
				ListMeta: metav1.ListMeta{ResourceVersion: "2"},
				Items:    []v1.Pod{*makePod("p1", "1"), *makePod("p2", "2")},
			},
			retrievedListOptions: metav1.ListOptions{TimeoutSeconds: ptr.To(int64(39))},
			retrievedList: &v1.PodList{
				ListMeta: metav1.ListMeta{ResourceVersion: "2"},
				Items:    []v1.Pod{*makePod("p1", "1"), *makePod("p2", "2")},
			},
			expectedRequestOptions: metav1.ListOptions{
				ResourceVersion:      "2",
				ResourceVersionMatch: metav1.ResourceVersionMatchExact,
				TimeoutSeconds:       ptr.To(int64(39)),
			},
		},
		{
			name: "list detector works with a unstructured list",
			listResponse: &unstructured.UnstructuredList{
				Object: map[string]interface{}{
					"apiVersion": "vTest",
					"kind":       "rTestList",
					"metadata": map[string]interface{}{
						"resourceVersion": "3",
					},
				},
				Items: []unstructured.Unstructured{
					*makeUnstructuredObject("vTest", "rTest", "item1"),
					*makeUnstructuredObject("vTest", "rTest", "item2"),
					*makeUnstructuredObject("vTest", "rTest", "item3"),
				},
			},
			retrievedListOptions: metav1.ListOptions{TimeoutSeconds: ptr.To(int64(39))},
			retrievedList: &unstructured.UnstructuredList{
				Object: map[string]interface{}{
					"apiVersion": "vTest",
					"kind":       "rTestList",
					"metadata": map[string]interface{}{
						"resourceVersion": "3",
					},
				},
				Items: []unstructured.Unstructured{
					*makeUnstructuredObject("vTest", "rTest", "item1"),
					*makeUnstructuredObject("vTest", "rTest", "item2"),
					*makeUnstructuredObject("vTest", "rTest", "item3"),
				},
			},
			expectedRequestOptions: metav1.ListOptions{
				ResourceVersion:      "3",
				ResourceVersionMatch: metav1.ResourceVersionMatchExact,
				TimeoutSeconds:       ptr.To(int64(39)),
			},
		},
	}
	for _, scenario := range scenarios {
		t.Run(scenario.name, func(t *testing.T) {
			ctx := context.TODO()
			listOptions := metav1.ListOptions{TimeoutSeconds: ptr.To(int64(39))}
			fakeLister := &listWrapper{response: scenario.listResponse}

			checkListFromCacheDataConsistencyIfRequestedInternal(ctx, "", fakeLister.List, listOptions, scenario.retrievedList)

			require.Equal(t, 1, fakeLister.counter)
			require.Len(t, fakeLister.requestOptions, 1)
			require.Equal(t, scenario.expectedRequestOptions, fakeLister.requestOptions[0])
		})
	}
}
