/*
Copyright 2021 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 cpumanager

import (
	"testing"

	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/component-base/featuregate"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	pkgfeatures "k8s.io/kubernetes/pkg/features"
)

type optionAvailTest struct {
	option            string
	featureGate       featuregate.Feature
	featureGateEnable bool
	expectedAvailable bool
}

func TestPolicyDefaultsAvailable(t *testing.T) {
	testCases := []optionAvailTest{
		{
			option:            "this-option-does-not-exist",
			expectedAvailable: false,
		},
		{
			option:            FullPCPUsOnlyOption,
			expectedAvailable: true,
		},
	}
	for _, testCase := range testCases {
		t.Run(testCase.option, func(t *testing.T) {
			err := CheckPolicyOptionAvailable(testCase.option)
			isEnabled := (err == nil)
			if isEnabled != testCase.expectedAvailable {
				t.Errorf("option %q available got=%v expected=%v", testCase.option, isEnabled, testCase.expectedAvailable)
			}
		})
	}
}

func TestPolicyBetaOptionsAvailable(t *testing.T) {
	testCases := []optionAvailTest{
		{
			option:            "this-option-does-not-exist",
			featureGate:       pkgfeatures.CPUManagerPolicyBetaOptions,
			featureGateEnable: false,
			expectedAvailable: false,
		},
		{
			option:            "this-option-does-not-exist",
			featureGate:       pkgfeatures.CPUManagerPolicyBetaOptions,
			featureGateEnable: true,
			expectedAvailable: false,
		},
		{
			option:            FullPCPUsOnlyOption,
			featureGate:       pkgfeatures.CPUManagerPolicyBetaOptions,
			featureGateEnable: true,
			expectedAvailable: true,
		},
		{
			option:            FullPCPUsOnlyOption,
			featureGate:       pkgfeatures.CPUManagerPolicyBetaOptions,
			featureGateEnable: false,
			expectedAvailable: false,
		},
	}
	for _, testCase := range testCases {
		t.Run(testCase.option, func(t *testing.T) {
			defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, testCase.featureGate, testCase.featureGateEnable)()
			err := CheckPolicyOptionAvailable(testCase.option)
			isEnabled := (err == nil)
			if isEnabled != testCase.expectedAvailable {
				t.Errorf("option %q available got=%v expected=%v", testCase.option, isEnabled, testCase.expectedAvailable)
			}
		})
	}
}