/*
 * 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.mail;

import javax.mail.internet.MimeUtility;

import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.test.junit5.CamelTestSupport;
import org.junit.jupiter.api.Test;
import org.jvnet.mock_javamail.Mailbox;

/**
 * Unit test for Mail header decoding/unfolding support.
 */
public class MailMimeDecodeHeadersTest extends CamelTestSupport {
    private String nonAsciiSubject = "\uD83D\uDC2A rocks!";
    private String encodedNonAsciiSubject = "=?UTF-8?Q?=F0=9F=90=AA_rocks!?=";

    private String longSubject;
    {
        StringBuilder sb = new StringBuilder("Camel rocks!");

        int mimeFoldingLimit = 76;
        while (sb.length() <= mimeFoldingLimit) {
            sb.insert(7, "o");
        }
        longSubject = sb.toString();
    }
    private String foldedLongSubject = MimeUtility.fold(9, longSubject);

    @Test
    public void testLongMailSubject() throws Exception {
        Mailbox.clearAll();

        // The email subject is >76 chars and will get MIME folded.
        template.sendBody("direct:longSubject", "");

        // When mimeDecodeHeaders=true is used, expect the received subject to be MIME unfolded.
        MockEndpoint mockDecoded = getMockEndpoint("mock:decoded");
        mockDecoded.expectedMessageCount(1);
        mockDecoded.expectedHeaderReceived("subject", longSubject);
        mockDecoded.setResultWaitTime(10000);
        mockDecoded.assertIsSatisfied();

        // When mimeDecodeHeaders=false or missing, expect the received subject to be MIME folded.
        MockEndpoint mockPlain = getMockEndpoint("mock:plain");
        mockPlain.expectedMessageCount(1);
        mockPlain.expectedHeaderReceived("subject", foldedLongSubject);
        mockPlain.setResultWaitTime(10000);
        mockPlain.assertIsSatisfied();
    }

    @Test
    public void testNonAsciiMailSubject() throws Exception {
        Mailbox.clearAll();

        // The email subject contains non-ascii characters and will be encoded.
        template.sendBody("direct:nonAsciiSubject", "");

        // When mimeDecodeHeaders=true is used, expect the received subject to be MIME encoded.
        MockEndpoint mockDecoded = getMockEndpoint("mock:decoded");
        mockDecoded.expectedMessageCount(1);
        mockDecoded.expectedHeaderReceived("subject", nonAsciiSubject);
        mockDecoded.assertIsSatisfied();

        // When mimeDecodeHeaders=false or missing, expect the received subject to be MIME encoded.
        MockEndpoint mockPlain = getMockEndpoint("mock:plain");
        mockPlain.expectedMessageCount(1);
        mockPlain.expectedHeaderReceived("subject", encodedNonAsciiSubject);
        mockPlain.assertIsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            public void configure() throws Exception {
                from("direct:longSubject")
                        .setHeader("subject", constant(longSubject))
                        .to("smtp://plain@localhost", "smtp://decoded@localhost");

                from("direct:nonAsciiSubject")
                        .setHeader("subject", constant(nonAsciiSubject))
                        .to("smtp://plain@localhost", "smtp://decoded@localhost");

                from("pop3://localhost?username=plain&password=secret&initialDelay=100&delay=100")
                        .to("mock:plain");

                from("pop3://localhost?username=decoded&password=secret&initialDelay=100&delay=100&mimeDecodeHeaders=true")
                        .to("mock:decoded");
            }
        };
    }
}
