/*
 * ============LICENSE_START=======================================================
 * ONAP
 * ================================================================================
 * Copyright (C) 2017-2019, 2021 AT&T Intellectual Property. All rights reserved.
 * Modifications Copyright (C) 2023 Nordix Foundation.
 * ================================================================================
 * 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.policy.common.endpoints.http.client;

import com.google.re2j.Pattern;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Properties;
import org.apache.commons.lang3.StringUtils;
import org.onap.policy.common.endpoints.event.comm.bus.internal.BusTopicParams;
import org.onap.policy.common.endpoints.http.client.internal.JerseyClient;
import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
import org.onap.policy.common.endpoints.utils.PropertyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * HTTP client factory implementation indexed by name.
 */
class IndexedHttpClientFactory implements HttpClientFactory {
    private static final Pattern COMMA_SPACE_PAT = Pattern.compile("\\s*,\\s*");

    /**
     * Logger.
     */
    private static final Logger logger = LoggerFactory.getLogger(IndexedHttpClientFactory.class);

    protected HashMap<String, HttpClient> clients = new HashMap<>();

    @Override
    public synchronized HttpClient build(BusTopicParams busTopicParams) throws HttpClientConfigException {
        if (clients.containsKey(busTopicParams.getClientName())) {
            return clients.get(busTopicParams.getClientName());
        }

        JerseyClient client;
        try {
            client = new JerseyClient(busTopicParams);
        } catch (KeyManagementException | NoSuchAlgorithmException | ClassNotFoundException e) {
            throw new HttpClientConfigException(e);
        }

        if (busTopicParams.isManaged()) {
            clients.put(busTopicParams.getClientName(), client);
        }

        return client;
    }

    @Override
    public synchronized List<HttpClient> build(Properties properties) throws HttpClientConfigException {
        ArrayList<HttpClient> clientList = new ArrayList<>();

        String clientNames = properties.getProperty(PolicyEndPointProperties.PROPERTY_HTTP_CLIENT_SERVICES);
        if (StringUtils.isBlank(clientNames)) {
            return clientList;
        }

        for (String clientName : COMMA_SPACE_PAT.split(clientNames)) {
            addClient(clientList, clientName, properties);
        }

        return clientList;
    }

    private void addClient(ArrayList<HttpClient> clientList, String clientName, Properties properties) {
        String clientPrefix = PolicyEndPointProperties.PROPERTY_HTTP_CLIENT_SERVICES + "." + clientName;

        var props = new PropertyUtils(properties, clientPrefix,
            (name, value, ex) ->
                logger.warn("{}: {} {} is in invalid format for http client {} ", this, name, value, clientName));

        var port = props.getInteger(PolicyEndPointProperties.PROPERTY_HTTP_PORT_SUFFIX, -1);
        if (port < 0) {
            logger.warn("No HTTP port for client in {}", clientName);
            return;
        }

        try {
            HttpClient client = this.build(BusTopicParams.builder()
                .clientName(clientName)
                .useHttps(props.getBoolean(PolicyEndPointProperties.PROPERTY_HTTP_HTTPS_SUFFIX, false))
                .allowSelfSignedCerts(
                    props.getBoolean(PolicyEndPointProperties.PROPERTY_ALLOW_SELF_SIGNED_CERTIFICATES_SUFFIX, false))
                .hostname(props.getString(PolicyEndPointProperties.PROPERTY_HTTP_HOST_SUFFIX, null))
                .port(port)
                .basePath(props.getString(PolicyEndPointProperties.PROPERTY_HTTP_URL_SUFFIX, null))
                .userName(props.getString(PolicyEndPointProperties.PROPERTY_HTTP_AUTH_USERNAME_SUFFIX,
                                null))
                .password(props.getString(PolicyEndPointProperties.PROPERTY_HTTP_AUTH_PASSWORD_SUFFIX,
                                null))
                .managed(props.getBoolean(PolicyEndPointProperties.PROPERTY_MANAGED_SUFFIX, true))
                .serializationProvider(props.getString(
                                PolicyEndPointProperties.PROPERTY_HTTP_SERIALIZATION_PROVIDER, null))
                .build());
            clientList.add(client);
        } catch (Exception e) {
            logger.error("http-client-factory: cannot build client {}", clientName, e);
        }
    }

    @Override
    public synchronized HttpClient get(String name) {
        if (clients.containsKey(name)) {
            return clients.get(name);
        }

        throw new IllegalArgumentException("Http Client " + name + " not found");
    }

    @Override
    public synchronized List<HttpClient> inventory() {
        return new ArrayList<>(this.clients.values());
    }

    @Override
    public synchronized void destroy(String name) {
        if (!clients.containsKey(name)) {
            return;
        }

        HttpClient client = clients.remove(name);
        try {
            client.shutdown();
        } catch (IllegalStateException e) {
            logger.error("http-client-factory: cannot shutdown client {}", client, e);
        }
    }

    @Override
    public void destroy() {
        List<HttpClient> clientsInventory = this.inventory();
        for (HttpClient client : clientsInventory) {
            client.shutdown();
        }

        synchronized (this) {
            this.clients.clear();
        }
    }

}