// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 (
	"io/ioutil"
	"os"
	"path/filepath"
	"time"

	utilruntime "k8s.io/apimachinery/pkg/util/runtime"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/tools/leaderelection/resourcelock"
	componentbaseconfigv1alpha1 "k8s.io/component-base/config/v1alpha1"
)

var (
	// DefaultDiscoveryDir is the directory where the discovery and http cache directory reside.
	DefaultDiscoveryDir string
	// DefaultDiscoveryCacheDir is the default discovery cache directory.
	DefaultDiscoveryCacheDir string
	// DefaultDiscoveryHTTPCacheDir is the default discovery http cache directory.
	DefaultDiscoveryHTTPCacheDir string
)

func init() {
	var err error
	DefaultDiscoveryDir, err = ioutil.TempDir("", "gardener-discovery")
	utilruntime.Must(err)

	DefaultDiscoveryCacheDir = filepath.Join(DefaultDiscoveryDir, "cache")
	DefaultDiscoveryHTTPCacheDir = filepath.Join(DefaultDiscoveryDir, "http-cache")

	utilruntime.Must(os.Mkdir(DefaultDiscoveryCacheDir, 0700))
	utilruntime.Must(os.Mkdir(DefaultDiscoveryHTTPCacheDir, 0700))
}

func addDefaultingFuncs(scheme *runtime.Scheme) error {
	return RegisterDefaults(scheme)
}

// SetDefaults_ControllerManagerConfiguration sets defaults for the configuration of the Gardener controller manager.
func SetDefaults_ControllerManagerConfiguration(obj *ControllerManagerConfiguration) {
	if len(obj.Server.HTTP.BindAddress) == 0 {
		obj.Server.HTTP.BindAddress = "0.0.0.0"
	}
	if obj.Server.HTTP.Port == 0 {
		obj.Server.HTTP.Port = 2718
	}
	if len(obj.Server.HTTPS.BindAddress) == 0 {
		obj.Server.HTTPS.BindAddress = "0.0.0.0"
	}
	if obj.Server.HTTPS.Port == 0 {
		obj.Server.HTTPS.Port = 2719
	}

	if obj.Controllers.CloudProfile == nil {
		obj.Controllers.CloudProfile = &CloudProfileControllerConfiguration{
			ConcurrentSyncs: 5,
		}
	}
	if obj.Controllers.ControllerRegistration == nil {
		obj.Controllers.ControllerRegistration = &ControllerRegistrationControllerConfiguration{
			ConcurrentSyncs: 5,
		}
	}
	if obj.Controllers.Project == nil {
		obj.Controllers.Project = &ProjectControllerConfiguration{
			ConcurrentSyncs: 5,
		}
	}
	if obj.Controllers.Quota == nil {
		obj.Controllers.Quota = &QuotaControllerConfiguration{
			ConcurrentSyncs: 5,
		}
	}

	if obj.Controllers.Plant == nil {
		obj.Controllers.Plant = &PlantControllerConfiguration{
			ConcurrentSyncs: 5,
			SyncPeriod: metav1.Duration{
				Duration: 30 * time.Second,
			},
		}
	}
	if obj.Controllers.SecretBinding == nil {
		obj.Controllers.SecretBinding = &SecretBindingControllerConfiguration{
			ConcurrentSyncs: 5,
		}
	}
	if obj.Controllers.Seed == nil {
		obj.Controllers.Seed = &SeedControllerConfiguration{
			ConcurrentSyncs: 5,
			SyncPeriod: metav1.Duration{
				Duration: 30 * time.Second,
			},
		}
	}

	if obj.Controllers.Seed.MonitorPeriod == nil {
		v := metav1.Duration{Duration: 40 * time.Second}
		obj.Controllers.Seed.MonitorPeriod = &v
	}
	if obj.Controllers.Seed.ShootMonitorPeriod == nil {
		v := metav1.Duration{Duration: 5 * obj.Controllers.Seed.MonitorPeriod.Duration}
		obj.Controllers.Seed.ShootMonitorPeriod = &v
	}

	if obj.Discovery.TTL == nil {
		obj.Discovery.TTL = &metav1.Duration{Duration: DefaultDiscoveryTTL}
	}
	if obj.Discovery.HTTPCacheDir == nil {
		obj.Discovery.HTTPCacheDir = &DefaultDiscoveryHTTPCacheDir
	}
	if obj.Discovery.DiscoveryCacheDir == nil {
		obj.Discovery.DiscoveryCacheDir = &DefaultDiscoveryCacheDir
	}
}

// SetDefaults_GardenClientConnection sets defaults for the client connection.
func SetDefaults_GardenClientConnection(obj *componentbaseconfigv1alpha1.ClientConnectionConfiguration) {
	//componentbaseconfigv1alpha1.RecommendedDefaultClientConnectionConfiguration(obj)
	// https://github.com/kubernetes/client-go/issues/76#issuecomment-396170694
	if len(obj.AcceptContentTypes) == 0 {
		obj.AcceptContentTypes = "application/json"
	}
	if len(obj.ContentType) == 0 {
		obj.ContentType = "application/json"
	}
	if obj.QPS == 0.0 {
		obj.QPS = 50.0
	}
	if obj.Burst == 0 {
		obj.Burst = 100
	}
}

// SetDefaults_LeaderElectionConfiguration sets defaults for the leader election of the Gardener controller manager.
func SetDefaults_LeaderElectionConfiguration(obj *LeaderElectionConfiguration) {
	componentbaseconfigv1alpha1.RecommendedDefaultLeaderElectionConfiguration(&obj.LeaderElectionConfiguration)

	obj.ResourceLock = resourcelock.ConfigMapsResourceLock

	if len(obj.LockObjectNamespace) == 0 {
		obj.LockObjectNamespace = ControllerManagerDefaultLockObjectNamespace
	}
	if len(obj.LockObjectName) == 0 {
		obj.LockObjectName = ControllerManagerDefaultLockObjectName
	}
}