// 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 bgpsyncer

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

	"github.com/projectcalico/calico/libcalico-go/lib/apiconfig"
	libapiv3 "github.com/projectcalico/calico/libcalico-go/lib/apis/v3"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/api"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/model"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/syncersv1/updateprocessors"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/watchersyncer"
)

// New creates a new BGP v1 Syncer.  Since only etcdv3 supports Watchers for all of
// the required resource types, the WatcherSyncer will go into a polling loop for
// KDD.  An optional node name may be supplied.  If set, the syncer only watches
// the specified node rather than all nodes.
func New(client api.Client, callbacks api.SyncerCallbacks, node string, cfg apiconfig.CalicoAPIConfigSpec) api.Syncer {
	// Create ResourceTypes required for BGP.
	resourceTypes := []watchersyncer.ResourceType{
		{
			ListInterface:   model.ResourceListOptions{Kind: apiv3.KindIPPool},
			UpdateProcessor: updateprocessors.NewIPPoolUpdateProcessor(),
		},
		{
			ListInterface: model.ResourceListOptions{Kind: apiv3.KindBGPConfiguration},
		},
		{
			ListInterface: model.ResourceListOptions{Kind: libapiv3.KindNode},
		},
		{
			ListInterface: model.ResourceListOptions{Kind: apiv3.KindBGPPeer},
		},
		{
			ListInterface: model.ResourceListOptions{Kind: apiv3.KindBGPFilter},
		},
	}

	// If using Calico IPAM, include IPAM resources.
	if !cfg.K8sUsePodCIDR {
		resourceTypes = append(resourceTypes, watchersyncer.ResourceType{
			ListInterface: model.BlockAffinityListOptions{Host: node},
		})
	}

	return watchersyncer.New(client, resourceTypes, callbacks)
}