/*
Copyright 2023 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 options

import (
	"strings"
	"testing"

	kubeapiserveradmission "k8s.io/apiserver/pkg/admission"
	genericoptions "k8s.io/apiserver/pkg/server/options"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/component-base/featuregate"
	basemetrics "k8s.io/component-base/metrics"
	"k8s.io/kubernetes/pkg/features"

	peerreconcilers "k8s.io/apiserver/pkg/reconcilers"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	kubeoptions "k8s.io/kubernetes/pkg/kubeapiserver/options"
)

func TestValidateAPIPriorityAndFairness(t *testing.T) {
	const conflict = "conflicts with --enable-priority-and-fairness=true"
	tests := []struct {
		runtimeConfig    string
		errShouldContain string
	}{
		{
			runtimeConfig:    "api/all=false",
			errShouldContain: conflict,
		},
		{
			runtimeConfig:    "api/beta=false",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "api/ga=false",
			errShouldContain: conflict,
		},
		{
			runtimeConfig:    "api/ga=true",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1beta1=false",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1beta2=false",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1beta3=false",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1beta3=true",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1=true",
			errShouldContain: "",
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1=false",
			errShouldContain: conflict,
		},
		{
			runtimeConfig:    "flowcontrol.apiserver.k8s.io/v1beta3=true,flowcontrol.apiserver.k8s.io/v1=false",
			errShouldContain: conflict,
		},
	}

	for _, test := range tests {
		t.Run(test.runtimeConfig, func(t *testing.T) {
			options := &Options{
				Features: &genericoptions.FeatureOptions{
					EnablePriorityAndFairness: true,
				},
				APIEnablement: genericoptions.NewAPIEnablementOptions(),
			}
			options.APIEnablement.RuntimeConfig.Set(test.runtimeConfig)

			var errMessageGot string
			if errs := validateAPIPriorityAndFairness(options); len(errs) > 0 {
				errMessageGot = errs[0].Error()
			}

			switch {
			case len(test.errShouldContain) == 0:
				if len(errMessageGot) > 0 {
					t.Errorf("Expected no error, but got: %q", errMessageGot)
				}
			default:
				if !strings.Contains(errMessageGot, test.errShouldContain) {
					t.Errorf("Expected error message to contain: %q, but got: %q", test.errShouldContain, errMessageGot)
				}
			}
		})
	}
}

func TestValidateUnknownVersionInteroperabilityProxy(t *testing.T) {
	tests := []struct {
		name                 string
		featureEnabled       bool
		errShouldContain     string
		peerCAFile           string
		peerAdvertiseAddress peerreconcilers.PeerAdvertiseAddress
	}{
		{
			name:             "feature disabled but peerCAFile set",
			featureEnabled:   false,
			peerCAFile:       "foo",
			errShouldContain: "--peer-ca-file requires UnknownVersionInteroperabilityProxy feature to be turned on",
		},
		{
			name:                 "feature disabled but peerAdvertiseIP set",
			featureEnabled:       false,
			peerAdvertiseAddress: peerreconcilers.PeerAdvertiseAddress{PeerAdvertiseIP: "1.2.3.4"},
			errShouldContain:     "--peer-advertise-ip requires UnknownVersionInteroperabilityProxy feature to be turned on",
		},
		{
			name:                 "feature disabled but peerAdvertisePort set",
			featureEnabled:       false,
			peerAdvertiseAddress: peerreconcilers.PeerAdvertiseAddress{PeerAdvertisePort: "1"},
			errShouldContain:     "--peer-advertise-port requires UnknownVersionInteroperabilityProxy feature to be turned on",
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			options := &Options{
				PeerCAFile:           test.peerCAFile,
				PeerAdvertiseAddress: test.peerAdvertiseAddress,
			}
			if test.featureEnabled {
				defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.UnknownVersionInteroperabilityProxy, true)()
			}
			var errMessageGot string
			if errs := validateUnknownVersionInteroperabilityProxyFlags(options); len(errs) > 0 {
				errMessageGot = errs[0].Error()
			}
			if !strings.Contains(errMessageGot, test.errShouldContain) {
				t.Errorf("Expected error message to contain: %q, but got: %q", test.errShouldContain, errMessageGot)
			}

		})
	}
}

func TestValidateUnknownVersionInteroperabilityProxyFeature(t *testing.T) {
	const conflict = "UnknownVersionInteroperabilityProxy feature requires StorageVersionAPI feature flag to be enabled"
	tests := []struct {
		name            string
		featuresEnabled []featuregate.Feature
	}{
		{
			name:            "enabled: UnknownVersionInteroperabilityProxy, disabled: StorageVersionAPI",
			featuresEnabled: []featuregate.Feature{features.UnknownVersionInteroperabilityProxy},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			for _, feature := range test.featuresEnabled {
				defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, feature, true)()
			}
			var errMessageGot string
			if errs := validateUnknownVersionInteroperabilityProxyFeature(); len(errs) > 0 {
				errMessageGot = errs[0].Error()
			}
			if !strings.Contains(errMessageGot, conflict) {
				t.Errorf("Expected error message to contain: %q, but got: %q", conflict, errMessageGot)
			}
		})
	}
}

func TestValidateOptions(t *testing.T) {
	testCases := []struct {
		name         string
		options      *Options
		expectErrors bool
	}{
		{
			name:         "validate master count equal 0",
			expectErrors: true,
			options: &Options{
				GenericServerRunOptions: &genericoptions.ServerRunOptions{},
				Etcd:                    &genericoptions.EtcdOptions{},
				SecureServing:           &genericoptions.SecureServingOptionsWithLoopback{},
				Audit:                   &genericoptions.AuditOptions{},
				Admission: &kubeoptions.AdmissionOptions{
					GenericAdmission: &genericoptions.AdmissionOptions{
						EnablePlugins: []string{"foo"},
						Plugins:       kubeapiserveradmission.NewPlugins(),
					},
					PluginNames: []string{"foo"},
				},
				Authentication: &kubeoptions.BuiltInAuthenticationOptions{
					APIAudiences: []string{"bar"},
					ServiceAccounts: &kubeoptions.ServiceAccountAuthenticationOptions{
						Issuers: []string{"baz"},
					},
				},
				APIEnablement:                genericoptions.NewAPIEnablementOptions(),
				Metrics:                      &basemetrics.Options{},
				ServiceAccountSigningKeyFile: "",
				Features:                     &genericoptions.FeatureOptions{},
			},
		},
		{
			name:         "validate token request enable not attempted",
			expectErrors: true,
			options: &Options{
				GenericServerRunOptions: &genericoptions.ServerRunOptions{},
				Etcd:                    &genericoptions.EtcdOptions{},
				SecureServing:           &genericoptions.SecureServingOptionsWithLoopback{},
				Audit:                   &genericoptions.AuditOptions{},
				Admission: &kubeoptions.AdmissionOptions{
					GenericAdmission: &genericoptions.AdmissionOptions{
						EnablePlugins: []string{""},
						Plugins:       kubeapiserveradmission.NewPlugins(),
					},
					PluginNames: []string{""},
				},
				Authentication: &kubeoptions.BuiltInAuthenticationOptions{
					ServiceAccounts: &kubeoptions.ServiceAccountAuthenticationOptions{},
				},
				APIEnablement:                genericoptions.NewAPIEnablementOptions(),
				Metrics:                      &basemetrics.Options{},
				ServiceAccountSigningKeyFile: "",
				Features:                     &genericoptions.FeatureOptions{},
			},
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			errs := tc.options.Validate()
			if len(errs) > 0 && !tc.expectErrors {
				t.Errorf("expected no errors, errors found %+v", errs)
			}

			if len(errs) == 0 && tc.expectErrors {
				t.Errorf("expected errors, no errors found")
			}
		})
	}
}