/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.aai.schemaservice.web;

import java.util.List;
import java.util.Set;
import java.util.logging.Logger;
import java.util.stream.Collectors;

import javax.annotation.Priority;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.ContainerResponseFilter;

import org.glassfish.jersey.server.ResourceConfig;
import org.onap.aai.schemaservice.edges.EdgeResource;
import org.onap.aai.schemaservice.healthcheck.EchoResource;
import org.onap.aai.schemaservice.nodeschema.NodeSchemaResource;
import org.onap.aai.schemaservice.query.QueryResource;
import org.onap.aai.schemaservice.versions.VersionResource;
import org.onap.logging.filter.base.AuditLogContainerFilter;
import org.reflections.Reflections;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Profile;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

@Component
public class JerseyConfiguration extends ResourceConfig {

    private static final Logger log = Logger.getLogger(JerseyConfiguration.class.getName());

    private Environment env;

    @Autowired
    public JerseyConfiguration(Environment env) {

        this.env = env;

        register(VersionResource.class);
        register(EchoResource.class);
        register(NodeSchemaResource.class);
        register(QueryResource.class);
        register(EdgeResource.class);

        // Request Filters
        registerFilters(ContainerRequestFilter.class);
        registerFilters(ContainerResponseFilter.class);
        registerFilters(AuditLogContainerFilter.class);

    }

    public <T> void registerFilters(Class<T> type) {

        Reflections loggingReflections = new Reflections("org.onap.aai.aailog.filter");
        Reflections reflections = new Reflections("org.onap.aai.schemaservice.interceptors");
        // Filter them based on the clazz that was passed in
        Set<Class<? extends T>> filters = loggingReflections.getSubTypesOf(type);
        filters.addAll(reflections.getSubTypesOf(type));

        // Check to ensure that each of the filter has the @Priority annotation and if not throw
        // exception
        for (Class<?> filterClass : filters) {
            if (filterClass.getAnnotation(Priority.class) == null) {
                throw new RuntimeException("Container filter " + filterClass.getName()
                    + " does not have @Priority annotation");
            }
        }

        // Turn the set back into a list
        List<Class<? extends T>> filtersList = filters.stream().filter(f -> {
            if (f.isAnnotationPresent(Profile.class)
                && !env.acceptsProfiles(f.getAnnotation(Profile.class).value())) {
                return false;
            }
            return true;
        }).collect(Collectors.toList());

        // Sort them by their priority levels value
        filtersList.sort((c1, c2) -> Integer.valueOf(c1.getAnnotation(Priority.class).value())
            .compareTo(c2.getAnnotation(Priority.class).value()));

        // Then register this to the jersey application
        filtersList.forEach(this::register);
    }

}