// Copyright (c) 2017, 2020 Tigera, Inc. All rights reserved.

// 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 clientv3

import (
	"context"

	apiv3 "github.com/projectcalico/api/pkg/apis/projectcalico/v3"

	"github.com/projectcalico/calico/libcalico-go/lib/options"
	validator "github.com/projectcalico/calico/libcalico-go/lib/validator/v3"
	"github.com/projectcalico/calico/libcalico-go/lib/watch"
)

const (
	DefaultFelixRouteTableRangeMin = 1
	DefaultFelixRouteTableRangeMax = 250
)

// FelixConfigurationInterface has methods to work with FelixConfiguration resources.
type FelixConfigurationInterface interface {
	Create(ctx context.Context, res *apiv3.FelixConfiguration, opts options.SetOptions) (*apiv3.FelixConfiguration, error)
	Update(ctx context.Context, res *apiv3.FelixConfiguration, opts options.SetOptions) (*apiv3.FelixConfiguration, error)
	Delete(ctx context.Context, name string, opts options.DeleteOptions) (*apiv3.FelixConfiguration, error)
	Get(ctx context.Context, name string, opts options.GetOptions) (*apiv3.FelixConfiguration, error)
	List(ctx context.Context, opts options.ListOptions) (*apiv3.FelixConfigurationList, error)
	Watch(ctx context.Context, opts options.ListOptions) (watch.Interface, error)
}

// felixConfigurations implements FelixConfigurationInterface
type felixConfigurations struct {
	client client
}

// Create takes the representation of a FelixConfiguration and creates it.
// Returns the stored representation of the FelixConfiguration, and an error
// if there is any.
func (r felixConfigurations) Create(ctx context.Context, res *apiv3.FelixConfiguration, opts options.SetOptions) (*apiv3.FelixConfiguration, error) {
	setDefaults(res)
	if err := validator.Validate(res); err != nil {
		return nil, err
	}

	out, err := r.client.resources.Create(ctx, opts, apiv3.KindFelixConfiguration, res)
	if out != nil {
		return out.(*apiv3.FelixConfiguration), err
	}
	return nil, err
}

// Update takes the representation of a FelixConfiguration and updates it.
// Returns the stored representation of the FelixConfiguration, and an error
// if there is any.
func (r felixConfigurations) Update(ctx context.Context, res *apiv3.FelixConfiguration, opts options.SetOptions) (*apiv3.FelixConfiguration, error) {
	setDefaults(res)
	if err := validator.Validate(res); err != nil {
		return nil, err
	}

	out, err := r.client.resources.Update(ctx, opts, apiv3.KindFelixConfiguration, res)
	if out != nil {
		return out.(*apiv3.FelixConfiguration), err
	}
	return nil, err
}

// Delete takes name of the FelixConfiguration and deletes it. Returns an
// error if one occurs.
func (r felixConfigurations) Delete(ctx context.Context, name string, opts options.DeleteOptions) (*apiv3.FelixConfiguration, error) {
	out, err := r.client.resources.Delete(ctx, opts, apiv3.KindFelixConfiguration, noNamespace, name)
	if out != nil {
		return out.(*apiv3.FelixConfiguration), err
	}
	return nil, err
}

// Get takes name of the FelixConfiguration, and returns the corresponding
// FelixConfiguration object, and an error if there is any.
func (r felixConfigurations) Get(ctx context.Context, name string, opts options.GetOptions) (*apiv3.FelixConfiguration, error) {
	out, err := r.client.resources.Get(ctx, opts, apiv3.KindFelixConfiguration, noNamespace, name)
	if out != nil {
		return out.(*apiv3.FelixConfiguration), err
	}
	return nil, err
}

// List returns the list of FelixConfiguration objects that match the supplied options.
func (r felixConfigurations) List(ctx context.Context, opts options.ListOptions) (*apiv3.FelixConfigurationList, error) {
	res := &apiv3.FelixConfigurationList{}
	if err := r.client.resources.List(ctx, opts, apiv3.KindFelixConfiguration, apiv3.KindFelixConfigurationList, res); err != nil {
		return nil, err
	}
	return res, nil
}

// Watch returns a watch.Interface that watches the FelixConfiguration that
// match the supplied options.
func (r felixConfigurations) Watch(ctx context.Context, opts options.ListOptions) (watch.Interface, error) {
	return r.client.resources.Watch(ctx, opts, apiv3.KindFelixConfiguration, nil)
}

func setDefaults(fc *apiv3.FelixConfiguration) {
	// Defaulting of the FloatingIPs field is handled via CRD validation in CRD mode, but
	// requires an explicit defaulting step for etcd.
	if fc.Spec.FloatingIPs == nil {
		disabled := apiv3.FloatingIPsDisabled
		fc.Spec.FloatingIPs = &disabled
	}
	if fc.Spec.BPFConnectTimeLoadBalancing == nil {
		tcp := apiv3.BPFConnectTimeLBTCP
		fc.Spec.BPFConnectTimeLoadBalancing = &tcp
	}
	if fc.Spec.BPFHostNetworkedNATWithoutCTLB == nil {
		enabled := apiv3.BPFHostNetworkedNATEnabled
		fc.Spec.BPFHostNetworkedNATWithoutCTLB = &enabled
	}

	ctlbVal := apiv3.BPFConnectTimeLBDisabled
	if fc.Spec.BPFConnectTimeLoadBalancingEnabled != nil {
		disabled := apiv3.BPFHostNetworkedNATDisabled
		fc.Spec.BPFHostNetworkedNATWithoutCTLB = &disabled
		if *fc.Spec.BPFConnectTimeLoadBalancingEnabled {
			ctlbVal = apiv3.BPFConnectTimeLBEnabled
		}
		fc.Spec.BPFConnectTimeLoadBalancing = &ctlbVal
	}
}