/*
 *  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.directory.api.util;


import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.parallel.Execution;
import org.junit.jupiter.api.parallel.ExecutionMode;


/**
 * A test case for the UTFUtils methods 
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
@Execution(ExecutionMode.CONCURRENT)
public class UnicodeTest
{
    /** The file stream we use for this test */
    private  Path tmpFolder;
    private FileOutputStream fos = null;
    private FileInputStream fis = null;
    
    @BeforeEach
    public void init() throws IOException
    {
        tmpFolder = Files.createTempDirectory( FileUtilsTest.class.getSimpleName() );
        tmpFolder.toFile().deleteOnExit();
        
        try
        {
            File tmpFile = File.createTempFile( tmpFolder.toFile().getAbsolutePath(), "UTFUtils.test" );
            tmpFile.deleteOnExit();
            fos = new FileOutputStream( tmpFile );
            fis = new FileInputStream( tmpFile );
        }
        catch ( IOException e )
        {
        }
    }
    
    
    /**
     * Cleanup the streams after each test
     */
    @AfterEach
    public void reset()
    {
        try
        {
            fos.close();
            fis.close();
        }
        catch ( IOException e )
        {
        }
    }


    /**
     * 
     * Test write/read of a null string
     *
     * @throws Exception
     */
    @Test
    public void testNullString() throws Exception
    {
        ObjectOutputStream dos = new ObjectOutputStream( fos );
        ObjectInputStream dis = new ObjectInputStream( fis );
        String testString = null;
        Unicode.writeUTF( dos, testString );
        dos.flush();
        dos.close();
        assertEquals( testString, Unicode.readUTF( dis ) );
        dis.close();
    }


    /**
     * 
     * Test write/read of an empty string
     *
     * @throws Exception
     */
    @Test
    public void testEmptyString() throws Exception
    {
        ObjectOutputStream dos = new ObjectOutputStream( fos );
        ObjectInputStream dis = new ObjectInputStream( fis );
        String testString = "";
        Unicode.writeUTF( dos, testString );
        dos.flush();
        dos.close();
        assertEquals( testString, Unicode.readUTF( dis ) );
        dis.close();
    }


    /**
     * 
     * Test write/read of a large string (> 64Kb)
     *
     * @throws Exception
     */
    @Test
    public void testLargeString() throws Exception
    {
        ObjectOutputStream dos = new ObjectOutputStream( fos );
        ObjectInputStream dis = new ObjectInputStream( fis );
        char[] fill = new char[196622]; // 65535 * 3 + 17
        Arrays.fill( fill, '\u00fc' ); // German &&uuml
        String testString = new String( fill );
        Unicode.writeUTF( dos, testString );
        dos.flush();
        dos.close();
        assertEquals( testString, Unicode.readUTF( dis ) );
        dis.close();
    }


    @Test
    public void testOneByteChar()
    {
        char res = Unicode.bytesToChar( new byte[]
            { 0x30 } );

        assertEquals( '0', res );
    }


    @Test
    public void testOneByteChar00()
    {
        char res = Unicode.bytesToChar( new byte[]
            { 0x00 } );

        assertEquals( 0x00, res );
    }


    @Test
    public void testOneByteChar7F()
    {
        char res = Unicode.bytesToChar( new byte[]
            { 0x7F } );

        assertEquals( 0x7F, res );
    }


    @Test
    public void testTwoBytesChar()
    {
        char res = Unicode.bytesToChar( new byte[]
            { ( byte ) 0xCE, ( byte ) 0x91 } );

        assertEquals( 0x0391, res );
    }


    @Test
    public void testThreeBytesChar()
    {
        char res = Unicode.bytesToChar( new byte[]
            { ( byte ) 0xE2, ( byte ) 0x89, ( byte ) 0xA2 } );

        assertEquals( 0x2262, res );
    }


    @Test
    public void testcharToBytesOne()
    {
        assertEquals( "0x00 ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x0000 ) ) );
        assertEquals( "0x61 ", Strings.dumpBytes( Unicode.charToBytes( 'a' ) ) );
        assertEquals( "0x7F ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x007F ) ) );
    }


    @Test
    public void testcharToBytesTwo()
    {
        assertEquals( "0xC2 0x80 ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x0080 ) ) );
        assertEquals( "0xC3 0xBF ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x00FF ) ) );
        assertEquals( "0xC4 0x80 ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x0100 ) ) );
        assertEquals( "0xDF 0xBF ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x07FF ) ) );
    }


    @Test
    public void testcharToBytesThree()
    {
        assertEquals( "0xE0 0xA0 0x80 ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x0800 ) ) );
        assertEquals( "0xE0 0xBF 0xBF ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x0FFF ) ) );
        assertEquals( "0xE1 0x80 0x80 ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0x1000 ) ) );
        assertEquals( "0xEF 0xBF 0xBF ", Strings.dumpBytes( Unicode.charToBytes( ( char ) 0xFFFF ) ) );
    }
}