/*
Copyright 2018 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 v1alpha1

import (
	"time"

	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	utilpointer "k8s.io/utils/pointer"
)

// RecommendedDefaultLeaderElectionConfiguration defaults a pointer to a
// LeaderElectionConfiguration struct. This will set the recommended default
// values, but they may be subject to change between API versions. This function
// is intentionally not registered in the scheme as a "normal" `SetDefaults_Foo`
// function to allow consumers of this type to set whatever defaults for their
// embedded configs. Forcing consumers to use these defaults would be problematic
// as defaulting in the scheme is done as part of the conversion, and there would
// be no easy way to opt-out. Instead, if you want to use this defaulting method
// run it in your wrapper struct of this type in its `SetDefaults_` method.
func RecommendedDefaultLeaderElectionConfiguration(obj *LeaderElectionConfiguration) {
	zero := metav1.Duration{}
	if obj.LeaseDuration == zero {
		obj.LeaseDuration = metav1.Duration{Duration: 15 * time.Second}
	}
	if obj.RenewDeadline == zero {
		obj.RenewDeadline = metav1.Duration{Duration: 10 * time.Second}
	}
	if obj.RetryPeriod == zero {
		obj.RetryPeriod = metav1.Duration{Duration: 2 * time.Second}
	}
	if obj.ResourceLock == "" {
		// TODO(#80289): Figure out how to migrate to LeaseLock at this point.
		//   This will most probably require going through EndpointsLease first.
		obj.ResourceLock = EndpointsResourceLock
	}
	if obj.LeaderElect == nil {
		obj.LeaderElect = utilpointer.BoolPtr(true)
	}
}

// RecommendedDefaultClientConnectionConfiguration defaults a pointer to a
// ClientConnectionConfiguration struct. This will set the recommended default
// values, but they may be subject to change between API versions. This function
// is intentionally not registered in the scheme as a "normal" `SetDefaults_Foo`
// function to allow consumers of this type to set whatever defaults for their
// embedded configs. Forcing consumers to use these defaults would be problematic
// as defaulting in the scheme is done as part of the conversion, and there would
// be no easy way to opt-out. Instead, if you want to use this defaulting method
// run it in your wrapper struct of this type in its `SetDefaults_` method.
func RecommendedDefaultClientConnectionConfiguration(obj *ClientConnectionConfiguration) {
	if len(obj.ContentType) == 0 {
		obj.ContentType = "application/vnd.kubernetes.protobuf"
	}
	if obj.QPS == 0.0 {
		obj.QPS = 50.0
	}
	if obj.Burst == 0 {
		obj.Burst = 100
	}
}

// RecommendedDebuggingConfiguration defaults profiling and debugging configuration.
// This will set the recommended default
// values, but they may be subject to change between API versions. This function
// is intentionally not registered in the scheme as a "normal" `SetDefaults_Foo`
// function to allow consumers of this type to set whatever defaults for their
// embedded configs. Forcing consumers to use these defaults would be problematic
// as defaulting in the scheme is done as part of the conversion, and there would
// be no easy way to opt-out. Instead, if you want to use this defaulting method
// run it in your wrapper struct of this type in its `SetDefaults_` method.
func RecommendedDebuggingConfiguration(obj *DebuggingConfiguration) {
	if obj.EnableProfiling == nil {
		obj.EnableProfiling = utilpointer.BoolPtr(true) // profile debugging is cheap to have exposed and standard on kube binaries
	}
}

// NewRecommendedDebuggingConfiguration returns the current recommended DebuggingConfiguration.
// This may change between releases as recommendations shift.
func NewRecommendedDebuggingConfiguration() *DebuggingConfiguration {
	ret := &DebuggingConfiguration{}
	RecommendedDebuggingConfiguration(ret)
	return ret
}

// RecommendedLoggingConfiguration defaults logging configuration.
// This will set the recommended default
// values, but they may be subject to change between API versions. This function
// is intentionally not registered in the scheme as a "normal" `SetDefaults_Foo`
// function to allow consumers of this type to set whatever defaults for their
// embedded configs. Forcing consumers to use these defaults would be problematic
// as defaulting in the scheme is done as part of the conversion, and there would
// be no easy way to opt-out. Instead, if you want to use this defaulting method
// run it in your wrapper struct of this type in its `SetDefaults_` method.
func RecommendedLoggingConfiguration(obj *LoggingConfiguration) {
	if obj.Format == "" {
		obj.Format = "text"
	}
	var empty resource.QuantityValue
	if obj.Options.JSON.InfoBufferSize == empty {
		obj.Options.JSON.InfoBufferSize = resource.QuantityValue{
			// This is similar, but not quite the same as a default
			// constructed instance.
			Quantity: *resource.NewQuantity(0, resource.DecimalSI),
		}
		// This sets the unexported Quantity.s which will be compared
		// by reflect.DeepEqual in some tests.
		_ = obj.Options.JSON.InfoBufferSize.String()
	}
	if obj.FlushFrequency == 0 {
		obj.FlushFrequency = 5 * time.Second
	}
}
