/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.util;

import org.junit.Assert;
import org.junit.Test;

/**
 * Unit tests for {@link TestEncodingUtils}.
 *
 */
public class TestEncodingUtils {

    private static String constructString(final int [] unicodeChars) {
        final StringBuilder buffer = new StringBuilder();
        if (unicodeChars != null) {
            for (final int unicodeChar : unicodeChars) {
                buffer.append((char)unicodeChar);
            }
        }
        return buffer.toString();
    }

    static final int SWISS_GERMAN_HELLO [] = {
            0x47, 0x72, 0xFC, 0x65, 0x7A, 0x69, 0x5F, 0x7A, 0xE4, 0x6D, 0xE4
        };

    @Test
    public void testBytesToString() throws Exception {
        final String s = constructString(SWISS_GERMAN_HELLO);
        final byte[] utf = s.getBytes("UTF-8");
        final byte[] latin1 = s.getBytes("ISO-8859-1");

        final String s1 = EncodingUtils.getString(utf, "UTF-8");
        final String s2 = EncodingUtils.getString(latin1, "ISO-8859-1");

        Assert.assertEquals(s, s1);
        Assert.assertEquals(s, s2);

        try {
            EncodingUtils.getString(null, 0, 0, "UTF-8");
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getString(null, "UTF-8");
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getString(new byte[] {}, null);
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getString(new byte[] {}, "");
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testStringToBytesToString() throws Exception {
        final String s = constructString(SWISS_GERMAN_HELLO);
        final byte[] utf = s.getBytes("UTF-8");
        final byte[] latin1 = s.getBytes("ISO-8859-1");

        final byte[] data1 = EncodingUtils.getBytes(s, "UTF-8");
        final byte[] data2 = EncodingUtils.getBytes(s, "ISO-8859-1");

        Assert.assertNotNull(data1);
        Assert.assertEquals(utf.length, data1.length);
        for (int i = 0; i < utf.length; i++) {
            Assert.assertEquals(utf[i], data1[i]);
        }
        Assert.assertNotNull(data2);
        Assert.assertEquals(latin1.length, data2.length);
        for (int i = 0; i < latin1.length; i++) {
            Assert.assertEquals(latin1[i], data2[i]);
        }

        try {
            EncodingUtils.getBytes(null, "UTF-8");
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getBytes("what not", null);
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getBytes("what not", "");
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testAsciiBytesToString() throws Exception {
        final String s = "ascii only, I mean it!";
        Assert.assertEquals(s, EncodingUtils.getAsciiString(s.getBytes("US-ASCII")));
        try {
            EncodingUtils.getAsciiString(null);
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
        try {
            EncodingUtils.getAsciiString(null, 0, 0);
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testAsciiStringToBytes() throws Exception {
        final String s = "ascii only, I mean it!";
        final byte[] ascii = s.getBytes("US-ASCII");
        final byte[] data = EncodingUtils.getAsciiBytes(s);

        Assert.assertNotNull(data);
        Assert.assertEquals(ascii.length, data.length);
        for (int i = 0; i < ascii.length; i++) {
            Assert.assertEquals(ascii[i], data[i]);
        }
        try {
            EncodingUtils.getAsciiBytes(null);
            Assert.fail("IllegalArgumentException should have been thrown");
        } catch (final IllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testUnsupportedEncoding() {
        final String s = constructString(SWISS_GERMAN_HELLO);
        final byte[] b1 = s.getBytes();
        final byte[] b2 = EncodingUtils.getBytes(s, "ThisJustAintRight");
        Assert.assertEquals(b1.length, b2.length);
        for (int i = 0; i < b1.length; i++) {
            Assert.assertEquals(b1[i], b2[i]);
        }
        final String s1 = new String(b1);
        final String s2 = EncodingUtils.getString(b1, "ThisJustAintRight");
        Assert.assertEquals(s1, s2);
    }

}
