//
//  ========================================================================
//  Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.util;

import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class Utf8StringBufferTest
{
    @Test
    public void testUtfStringBuffer() throws Exception
    {
        String source = "abcd012345\n\r\u0000\u00a4\u10fb\ufffdjetty";
        byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
        Utf8StringBuffer buffer = new Utf8StringBuffer();
        for (byte aByte : bytes)
            buffer.append(aByte);
        assertEquals(source,buffer.toString());
        assertTrue(buffer.toString().endsWith("jetty"));
    }

    @Test(expected = IllegalArgumentException.class)
    public void testUtf8WithMissingByte() throws Exception
    {
        String source = "abc\u10fb";
        byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
        Utf8StringBuffer buffer = new Utf8StringBuffer();
        for (int i = 0; i < bytes.length - 1; i++)
            buffer.append(bytes[i]);
        buffer.toString();
    }

    @Test(expected = Utf8Appendable.NotUtf8Exception.class)
    public void testUtf8WithAdditionalByte() throws Exception
    {
        String source = "abcXX";
        byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
        bytes[3] = (byte)0xc0;
        bytes[4] = (byte)0x00;

        Utf8StringBuffer buffer = new Utf8StringBuffer();
        for (byte aByte : bytes)
            buffer.append(aByte);
    }


    @Test
    public void testUTF32codes() throws Exception
    {
        String source = "\uD842\uDF9F";
        byte[] bytes = source.getBytes(StandardCharsets.UTF_8);

        String jvmcheck = new String(bytes,0,bytes.length,StandardCharsets.UTF_8);
        assertEquals(source,jvmcheck);

        Utf8StringBuffer buffer = new Utf8StringBuffer();
        buffer.append(bytes,0,bytes.length);
        String result = buffer.toString();
        assertEquals(source,result);
    }
    @Test
    public void testGermanUmlauts() throws Exception
    {
        byte[] bytes = new byte[6];
        bytes[0] = (byte)0xC3;
        bytes[1] = (byte)0xBC;
        bytes[2] = (byte)0xC3;
        bytes[3] = (byte)0xB6;
        bytes[4] = (byte)0xC3;
        bytes[5] = (byte)0xA4;

        Utf8StringBuffer buffer = new Utf8StringBuffer();
        for (int i = 0; i < bytes.length; i++)
            buffer.append(bytes[i]);

        assertEquals("\u00FC\u00F6\u00E4",buffer.toString());
    }

    @Test(expected = Utf8Appendable.NotUtf8Exception.class)
    public void testInvalidUTF8() throws UnsupportedEncodingException
    {
        Utf8StringBuffer buffer = new Utf8StringBuffer();
        buffer.append((byte)0xC2);
        buffer.append((byte)0xC2);
    }
}
