/****************************************************************
 * 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.james.mime4j.stream;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.apache.james.mime4j.Charsets;
import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.io.InputStreams;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class MultipartStreamTest {

    private static final String BODY = "A Preamble\r\n" +
            "--1729\r\n\r\n" +
            "Simple plain text\r\n" +
            "--1729\r\n" +
            "Content-Type: text/plain; charset=US-ASCII\r\n\r\n" +
            "Some more text\r\n" +
            "--1729--\r\n";
    public static final String MESSAGE = "To: Road Runner <runner@example.org>\r\n" +
            "From: Wile E. Cayote <wile@example.org>\r\n" +
            "Date: Tue, 12 Feb 2008 17:34:09 +0000 (GMT)\r\n" +
            "Subject: Mail\r\n" +
            "Content-Type: multipart/mixed;boundary=1729\r\n\r\n" +
            BODY;

    public static final String COMPLEX_MESSAGE = "To: Wile E. Cayote <wile@example.org>\r\n" +
            "From: Road Runner <runner@example.org>\r\n" +
            "Date: Tue, 19 Feb 2008 17:34:09 +0000 (GMT)\r\n" +
            "Subject: Mail\r\n" +
            "Content-Type: multipart/mixed;boundary=42\r\n\r\n" +
            "A little preamble\r\n" +
            "--42\r\n" +
            "Content-Type: text/plain; charset=US-ASCII\r\n\r\n" +
            "Rhubard!\r\n" +
            "--42\r\n" +
            "Content-Type: message/rfc822\r\n\r\n" +
            MESSAGE +
            "\r\n" +
            "--42\r\n" +
            "Content-Type: text/plain; charset=US-ASCII\r\n\r\n" +
            "Custard!" +
            "\r\n" +
            "--42--\r\n";

    MimeTokenStream parser;

    @Before
    public void setUp() throws Exception {
        parser = new MimeTokenStream();
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void testShouldSupplyInputStreamForSimpleBody() throws Exception {
        parser.parse(InputStreams.create(MESSAGE, Charsets.US_ASCII));
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_START_MULTIPART);
        InputStream out = parser.getInputStream();
        Assert.assertEquals(BODY, IOUtils.toString(out, "us-ascii"));
        checkState(EntityState.T_END_MULTIPART);
    }

    @Test
    public void testInputStreamShouldReadOnlyMessage() throws Exception {
        parser.parse(InputStreams.create(COMPLEX_MESSAGE, Charsets.US_ASCII));
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_START_MULTIPART);
        checkState(EntityState.T_PREAMBLE);
        checkState(EntityState.T_START_BODYPART);
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_BODY);
        checkState(EntityState.T_END_BODYPART);
        checkState(EntityState.T_START_BODYPART);
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_START_MESSAGE);
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_START_MULTIPART);
        InputStream out = parser.getInputStream();
        Assert.assertEquals(BODY, IOUtils.toString(out, "us-ascii"));
        checkState(EntityState.T_END_MULTIPART);
        checkState(EntityState.T_END_MESSAGE);
        checkState(EntityState.T_END_BODYPART);
        checkState(EntityState.T_START_BODYPART);
        checkState(EntityState.T_START_HEADER);
        checkState(EntityState.T_FIELD);
        checkState(EntityState.T_END_HEADER);
        checkState(EntityState.T_BODY);
        checkState(EntityState.T_END_BODYPART);
        checkState(EntityState.T_END_MULTIPART);
        checkState(EntityState.T_END_MESSAGE);
        checkState(EntityState.T_END_OF_STREAM);
    }

    private void checkState(final EntityState state) throws IOException, MimeException {
        Assert.assertEquals(MimeTokenStream.stateToString(state), MimeTokenStream.stateToString(parser.next()));
    }
}