/*
Copyright 2020 VMware, Inc.
SPDX-License-Identifier: Apache-2.0
*/

package logindiscovery

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

	"github.com/sclevine/spec"
	"github.com/sclevine/spec/report"
	"github.com/stretchr/testify/require"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
	kubernetesfake "k8s.io/client-go/kubernetes/fake"
	coretesting "k8s.io/client-go/testing"

	"github.com/suzerain-io/controller-go"
	placeholderv1alpha1 "github.com/suzerain-io/placeholder-name-api/pkg/apis/placeholder/v1alpha1"
	placeholderfake "github.com/suzerain-io/placeholder-name-client-go/pkg/generated/clientset/versioned/fake"
)

// TODO: add test for ConfigMap does NOT exist
// TODO: add test for when LoginDiscoveryConfig already exists
//  There should be 4 tests of the above cross product

// TODO test when the expected key in the configmap does not exist

func TestRun(t *testing.T) {
	spec.Run(t, "publisher", func(t *testing.T, when spec.G, it spec.S) {
		const installedInNamespace = "some-namespace"

		var r *require.Assertions

		var subject controller.Controller
		var kubeClient *kubernetesfake.Clientset
		var placeholderClient *placeholderfake.Clientset
		var timeoutContext context.Context
		var timeoutContextCancel context.CancelFunc
		var controllerContext *controller.Context

		var expectedLoginDiscoveryConfig = func(expectedNamespace, expectedServerURL, expectedCAData string) (schema.GroupVersionResource, *placeholderv1alpha1.LoginDiscoveryConfig) {
			expectedLoginDiscoveryConfigGVR := schema.GroupVersionResource{
				Group:    placeholderv1alpha1.GroupName,
				Version:  "v1alpha1",
				Resource: "logindiscoveryconfigs",
			}
			expectedLoginDiscoveryConfig := &placeholderv1alpha1.LoginDiscoveryConfig{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "placeholder-name-config",
					Namespace: expectedNamespace,
				},
				Spec: placeholderv1alpha1.LoginDiscoveryConfigSpec{
					Server:                   expectedServerURL,
					CertificateAuthorityData: expectedCAData,
				},
			}
			return expectedLoginDiscoveryConfigGVR, expectedLoginDiscoveryConfig
		}

		it.Before(func() {
			r = require.New(t)
			kubeClient = kubernetesfake.NewSimpleClientset()
			placeholderClient = placeholderfake.NewSimpleClientset()
			timeoutContext, timeoutContextCancel = context.WithTimeout(context.Background(), time.Second*3)
			subject = NewPublisherController(installedInNamespace, kubeClient, placeholderClient)
			controllerContext = &controller.Context{
				Context: timeoutContext,
				Name:    subject.Name(),
				Key: controller.Key{
					Namespace: "kube-public",
					Name:      "cluster-info",
				},
			}
		})

		when("when there is a cluster-info ConfigMap in the kube-public namespace", func() {
			const caData = "c29tZS1jZXJ0aWZpY2F0ZS1hdXRob3JpdHktZGF0YQo=" // "some-certificate-authority-data" base64 encoded
			const kubeServerURL = "https://some-server"

			it.Before(func() {
				clusterInfo := &corev1.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{
						Name:      "cluster-info",
						Namespace: "kube-public",
					},
					// Note that go fmt puts tabs in our file, which we must remove from our configmap yaml below.
					Data: map[string]string{
						"kubeconfig": strings.ReplaceAll(`
							kind: Config
							apiVersion: v1
							clusters:
							- name: ""
							  cluster:
							    certificate-authority-data: "`+caData+`"
							    server: "`+kubeServerURL+`"`, "\t", "  "),
						"uninteresting-key": "uninteresting-value",
					},
				}
				err := kubeClient.Tracker().Add(clusterInfo)
				r.NoError(err)
			})

			when("when the LoginDiscoveryConfig does not already exist", func() {
				it("creates a LoginDiscoveryConfig", func() {
					defer timeoutContextCancel()

					err := controller.TestSync(t, subject, *controllerContext) // Call the controller's sync method once
					r.NoError(err)

					expectedLoginDiscoveryConfigGVR, expectedLoginDiscoveryConfig := expectedLoginDiscoveryConfig(installedInNamespace, kubeServerURL, caData)
					expectedActions := []coretesting.Action{
						coretesting.NewCreateAction(expectedLoginDiscoveryConfigGVR, installedInNamespace, expectedLoginDiscoveryConfig),
					}

					// Expect a LoginDiscoveryConfig to be created with the fields from the cluster-info ConfigMap
					actualCreatedObject := placeholderClient.Actions()[0].(coretesting.CreateActionImpl).Object
					r.Equal(expectedLoginDiscoveryConfig, actualCreatedObject)
					r.Equal(expectedActions, placeholderClient.Actions())
				})
			}, spec.Parallel())
		}, spec.Parallel())
	}, spec.Report(report.Terminal{}))
}