//Copyright 2017 Huawei Technologies Co., Ltd
//
//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 buildin

import (
	"fmt"
	"github.com/ServiceComb/service-center/pkg/util"
	"github.com/ServiceComb/service-center/server/infra/registry"
	mgr "github.com/ServiceComb/service-center/server/plugin"
	"golang.org/x/net/context"
)

func init() {
	mgr.RegisterPlugin(mgr.Plugin{mgr.STATIC, mgr.REGISTRY, "buildin", NewRegistry})
}

var noPluginErr = fmt.Errorf("register center plugin does not exist")

type BuildinRegistry struct {
	ready chan int
}

func (ec *BuildinRegistry) safeClose(chan int) {
	defer util.RecoverAndReport()
	close(ec.ready)
}
func (ec *BuildinRegistry) Err() (err <-chan error) {
	return
}
func (ec *BuildinRegistry) Ready() <-chan int {
	ec.safeClose(ec.ready)
	return ec.ready
}
func (ec *BuildinRegistry) PutNoOverride(ctx context.Context, opts ...registry.PluginOpOption) (bool, error) {
	return false, noPluginErr
}
func (ec *BuildinRegistry) Do(ctx context.Context, opts ...registry.PluginOpOption) (*registry.PluginResponse, error) {
	return nil, noPluginErr
}
func (ec *BuildinRegistry) Txn(ctx context.Context, ops []registry.PluginOp) (*registry.PluginResponse, error) {
	return nil, noPluginErr
}
func (ec *BuildinRegistry) TxnWithCmp(ctx context.Context, success []registry.PluginOp, cmp []registry.CompareOp, fail []registry.PluginOp) (*registry.PluginResponse, error) {
	return nil, noPluginErr
}
func (ec *BuildinRegistry) LeaseGrant(ctx context.Context, TTL int64) (leaseID int64, err error) {
	return 0, noPluginErr
}
func (ec *BuildinRegistry) LeaseRenew(ctx context.Context, leaseID int64) (TTL int64, err error) {
	return 0, noPluginErr
}
func (ec *BuildinRegistry) LeaseRevoke(ctx context.Context, leaseID int64) error {
	return noPluginErr
}
func (ec *BuildinRegistry) Watch(ctx context.Context, opts ...registry.PluginOpOption) error {
	return noPluginErr
}
func (ec *BuildinRegistry) Close() {
	ec.safeClose(ec.ready)
}

func NewRegistry() mgr.PluginInstance {
	return &BuildinRegistry{
		ready: make(chan int),
	}
}