package org.apache.maven.shared.filtering.streams;
/*
 * 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.
 */

import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import static org.junit.Assert.assertEquals;

public class WindowsLineFeedInputStreamTest
{

    @Test
    public void simpleString()
            throws Exception
    {
        assertEquals( "abc\r\n", roundtrip( "abc" ) );
    }

    @Test
    public void inTheMiddleOfTheLine()
            throws Exception
    {
        assertEquals( "a\r\nbc\r\n", roundtrip( "a\r\nbc" ) );
    }

    @Test
    public void multipleBlankLines()
            throws Exception
    {
        assertEquals( "a\r\n\r\nbc\r\n", roundtrip( "a\r\n\r\nbc" ) );
    }

    @Test
    public void twoLinesAtEnd()
            throws Exception
    {
        assertEquals( "a\r\n\r\n", roundtrip( "a\r\n\r\n" ) );
    }

    @Test
    public void linuxLinefeeds()
            throws Exception
    {
        final String roundtrip = roundtrip( "ab\nc", false );
        assertEquals( "ab\r\nc", roundtrip );
    }


    @Test
    public void malformed()
            throws Exception
    {
        assertEquals( "a\rbc", roundtrip( "a\rbc", false ) );
    }

    @Test
    public void retainLineFeed()
            throws Exception
    {
        assertEquals( "a\r\n\r\n", roundtrip( "a\r\n\r\n", false ) );
        assertEquals( "a", roundtrip( "a", false ) );
    }

    private String roundtrip( String msg )
            throws IOException
    {
        return roundtrip( msg, true );
    }

    private String roundtrip( String msg, boolean ensure )
            throws IOException
    {
        ByteArrayInputStream baos = new ByteArrayInputStream( msg.getBytes() );
        WindowsLineFeedInputStream lf = new WindowsLineFeedInputStream( baos, ensure );
        byte[] buf = new byte[100];
        final int read = lf.read( buf );
        return new String( buf, 0, read );
    }


}