/*
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 clustertrustbundlepublisher

import (
	"errors"
	"fmt"
	"strings"
	"testing"
	"time"

	certificatesv1alpha1 "k8s.io/api/certificates/v1alpha1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/component-base/metrics/legacyregistry"
	"k8s.io/component-base/metrics/testutil"
)

func TestSyncCounter(t *testing.T) {
	testCases := []struct {
		desc    string
		err     error
		metrics []string
		want    string
	}{
		{
			desc: "nil error",
			err:  nil,
			metrics: []string{
				"clustertrustbundle_publisher_sync_total",
			},
			want: `
# HELP clustertrustbundle_publisher_sync_total [ALPHA] Number of syncs that occurred in cluster trust bundle publisher.
# TYPE clustertrustbundle_publisher_sync_total counter
clustertrustbundle_publisher_sync_total{code="200"} 1
				`,
		},
		{
			desc: "kube api error",
			err:  apierrors.NewNotFound(certificatesv1alpha1.Resource("clustertrustbundle"), "test.test:testSigner:something"),
			metrics: []string{
				"clustertrustbundle_publisher_sync_total",
			},
			want: `
# HELP clustertrustbundle_publisher_sync_total [ALPHA] Number of syncs that occurred in cluster trust bundle publisher.
# TYPE clustertrustbundle_publisher_sync_total counter
clustertrustbundle_publisher_sync_total{code="404"} 1
				`,
		},
		{
			desc: "nested kube api error",
			err:  fmt.Errorf("oh noes: %w", apierrors.NewBadRequest("bad request!")),
			metrics: []string{
				"clustertrustbundle_publisher_sync_total",
			},
			want: `
# HELP clustertrustbundle_publisher_sync_total [ALPHA] Number of syncs that occurred in cluster trust bundle publisher.
# TYPE clustertrustbundle_publisher_sync_total counter
clustertrustbundle_publisher_sync_total{code="400"} 1
				`,
		},
		{
			desc: "kube api error without code",
			err:  &apierrors.StatusError{},
			metrics: []string{
				"clustertrustbundle_publisher_sync_total",
			},
			want: `
# HELP clustertrustbundle_publisher_sync_total [ALPHA] Number of syncs that occurred in cluster trust bundle publisher.
# TYPE clustertrustbundle_publisher_sync_total counter
clustertrustbundle_publisher_sync_total{code="500"} 1
				`,
		},
		{
			desc: "general error",
			err:  errors.New("test"),
			metrics: []string{
				"clustertrustbundle_publisher_sync_total",
			},
			want: `
# HELP clustertrustbundle_publisher_sync_total [ALPHA] Number of syncs that occurred in cluster trust bundle publisher.
# TYPE clustertrustbundle_publisher_sync_total counter
clustertrustbundle_publisher_sync_total{code="500"} 1
				`,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.desc, func(t *testing.T) {
			recordMetrics(time.Now(), tc.err)
			defer syncCounter.Reset()
			if err := testutil.GatherAndCompare(legacyregistry.DefaultGatherer, strings.NewReader(tc.want), tc.metrics...); err != nil {
				t.Fatal(err)
			}
		})
	}
}