/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 *
 * 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 io.fd.honeycomb.infra.distro.schema

import com.google.inject.Inject
import groovy.transform.ToString
import groovy.util.logging.Slf4j
import io.fd.honeycomb.infra.distro.ProviderTrait
import org.opendaylight.controller.sal.core.api.model.SchemaService
import org.opendaylight.yangtools.concepts.ListenerRegistration
import org.opendaylight.yangtools.sal.binding.generator.impl.ModuleInfoBackedContext
import org.opendaylight.yangtools.yang.model.api.Module
import org.opendaylight.yangtools.yang.model.api.SchemaContext
import org.opendaylight.yangtools.yang.model.api.SchemaContextListener

@Slf4j
@ToString
class SchemaServiceProvider extends ProviderTrait<SchemaService> {

    @Inject
    ModuleInfoBackedContext mibCtx;

    def create() { new StaticSchemaService(mibCtx.getSchemaContext()) }

    /**
     * Static schema context provider service.
     */
    static class StaticSchemaService implements SchemaService {

        private final SchemaContext schemaContext

        StaticSchemaService(SchemaContext schemaContext) {
            this.schemaContext = schemaContext
        }

        @Override
        void addModule(final Module module) {
            throw new UnsupportedOperationException("Static service")
        }

        @Override
        void removeModule(final Module module) {
            throw new UnsupportedOperationException("Static service")
        }

        @Override
        SchemaContext getSessionContext() {
            schemaContext
        }

        @Override
        SchemaContext getGlobalContext() {
            schemaContext
        }

        @Override
        ListenerRegistration<SchemaContextListener> registerSchemaContextListener(final SchemaContextListener listener) {
            listener.onGlobalContextUpdated schemaContext
            return new ListenerRegistration<SchemaContextListener>() {
                void close() {}
                SchemaContextListener getInstance() { listener }
            }
        }
    }
}