/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.as2.api.protocol;

import java.io.IOException;

import org.apache.camel.component.as2.api.AS2ClientManager;
import org.apache.camel.component.as2.api.AS2Constants;
import org.apache.camel.component.as2.api.AS2Header;
import org.apache.camel.component.as2.api.InvalidAS2NameException;
import org.apache.camel.component.as2.api.util.AS2Utils;
import org.apache.camel.util.StringHelper;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpRequestInterceptor;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.http.protocol.HttpCoreContext;

public class RequestAS2 implements HttpRequestInterceptor {

    private final String as2Version;
    private final String clientFQDN;

    public RequestAS2(String as2Version, String clientFQDN) {
        this.as2Version = as2Version;
        this.clientFQDN = clientFQDN;
    }

    @Override
    public void process(HttpRequest request, EntityDetails entity, HttpContext context) throws HttpException, IOException {

        HttpCoreContext coreContext = HttpCoreContext.adapt(context);

        /* MIME header */
        request.addHeader(AS2Header.MIME_VERSION, AS2Constants.MIME_VERSION);

        /* Subject header */
        String subject = coreContext.getAttribute(AS2ClientManager.SUBJECT, String.class);
        request.addHeader(AS2Header.SUBJECT, subject);

        /* From header */
        String from = coreContext.getAttribute(AS2ClientManager.FROM, String.class);
        request.addHeader(AS2Header.FROM, from);

        /* AS2-Version header */
        request.addHeader(AS2Header.AS2_VERSION, as2Version);

        /* AS2-From header */
        String as2From = coreContext.getAttribute(AS2ClientManager.AS2_FROM, String.class);
        try {
            AS2Utils.validateAS2Name(as2From);
        } catch (InvalidAS2NameException e) {
            throw new HttpException("Invalid AS-From name", e);
        }
        request.addHeader(AS2Header.AS2_FROM, as2From);

        /* AS2-To header */
        String as2To = coreContext.getAttribute(AS2ClientManager.AS2_TO, String.class);
        try {
            AS2Utils.validateAS2Name(as2To);
        } catch (InvalidAS2NameException e) {
            throw new HttpException("Invalid AS-To name", e);
        }
        request.addHeader(AS2Header.AS2_TO, as2To);

        /* AS2-Receipt-Delivery-Option header */
        String receiptDeliveryOption = coreContext.getAttribute(AS2ClientManager.RECEIPT_DELIVERY_OPTION, String.class);
        if (StringHelper.trimToNull(receiptDeliveryOption) != null) {
            request.addHeader(AS2Header.RECEIPT_DELIVERY_OPTION, receiptDeliveryOption);
        }

        /* Message-Id header*/
        // SHOULD be set to aid in message reconciliation
        request.addHeader(AS2Header.MESSAGE_ID, AS2Utils.createMessageId(clientFQDN));
    }

}
