/****************************************************************
 * 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.codec;

import java.io.UnsupportedEncodingException;

import junit.framework.TestCase;

public class DecoderUtilTest extends TestCase {

    public void testDecodeB() throws UnsupportedEncodingException {
        String s = DecoderUtil.decodeB("VGhpcyBpcyB0aGUgcGxhaW4gd"
                    + "GV4dCBtZXNzYWdlIQ==", "ISO8859-1", DecodeMonitor.STRICT);
        assertEquals("This is the plain text message!", s);
    }

    public void testDecodeQ() throws UnsupportedEncodingException {
        String s = DecoderUtil.decodeQ("=e1_=e2=09=E3_=E4_", "ISO8859-1", DecodeMonitor.STRICT);
        assertEquals("\u00e1 \u00e2\t\u00e3 \u00e4 ", s);
    }

    public void testNonEncodedWordsAreIgnored() {
        assertEquals("", DecoderUtil.decodeEncodedWords(""));
        assertEquals("Yada yada", DecoderUtil.decodeEncodedWords("Yada yada"));
    }

    public void testDecodeSomeEncodedWords() {
        assertEquals("  \u00e1\u00e2\u00e3\t\u00e4", 
                DecoderUtil.decodeEncodedWords("=?iso-8859-1?Q?_=20=e1=e2=E3=09=E4?="));
        assertEquals("Word 1 '  \u00e2\u00e3\t\u00e4'. Word 2 '  \u00e2\u00e3\t\u00e4'", 
                DecoderUtil.decodeEncodedWords("Word 1 '=?iso-8859-1?Q?_=20=e2=E3=09=E4?="
                        + "'. Word 2 '=?iso-8859-1?q?_=20=e2=E3=09=E4?='"));
        assertEquals("=?iso-8859-YADA?Q?_=20=t1=e2=E3=09=E4?=", 
                DecoderUtil.decodeEncodedWords("=?iso-8859-YADA?Q?_=20=t1=e2=E3=09=E4?="));
        assertEquals("A short text", 
                DecoderUtil.decodeEncodedWords("=?US-ASCII?B?QSBzaG9ydCB0ZXh0?="));
        assertEquals("A short text again!", 
                DecoderUtil.decodeEncodedWords("=?US-ASCII?b?QSBzaG9ydCB0ZXh0IGFnYWluIQ==?="));
    }

    public void testDecodeJapaneseEncodedWords() {
        String enc = "=?ISO-2022-JP?B?GyRCTCQbKEobJEI+NRsoShskQkJ6GyhKGyRCOS0bKEo=?= "
                 + "=?ISO-2022-JP?B?GyRCOXAbKEobJEIiKBsoShskQiU1GyhKGyRCJSQbKEo=?= "
                 + "=?ISO-2022-JP?B?GyRCJUkbKEobJEIlUxsoShskQiU4GyhKGyRCJU0bKEo=?= "  
                 + "=?ISO-2022-JP?B?GyRCJTkbKEobJEIkThsoShskQjdoGyhKGyRCRGobKEo=?= "
                 + "=?ISO-2022-JP?B?GyRCSEcbKEobJEIkRxsoShskQiQ5GyhKGyRCISobKEo=?=";      

        String dec = DecoderUtil.decodeEncodedWords(enc);
        assertEquals("\u672A\u627F\u8AFE\u5E83\u544A\u203B\u30B5\u30A4\u30C9\u30D3"
                + "\u30B8\u30CD\u30B9\u306E\u6C7A\u5B9A\u7248\u3067\u3059\uFF01", dec);
    }

    public void testInvalidEncodedWordsAreIgnored() {
        assertEquals("=?iso8859-1?Q?=", DecoderUtil.decodeEncodedWords("=?iso8859-1?Q?="));
        assertEquals("=?iso8859-1?b?=", DecoderUtil.decodeEncodedWords("=?iso8859-1?b?="));
        assertEquals("=?ISO-8859-1?Q?", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?"));
        assertEquals("=?ISO-8859-1?R?abc?=", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?R?abc?="));
        assertEquals("test =?ISO-8859-1?R?abc?=", DecoderUtil.decodeEncodedWords("test =?ISO-8859-1?R?abc?="));
    }

    public void testEmptyEncodedTextIsIgnored() {
        // encoded-text requires at least one character according to rfc 2047
        assertEquals("=?ISO-8859-1?Q??=", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q??="));
        assertEquals("=?ISO-8859-1?B??=", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?B??="));
    }

    // see MIME4J-104
    public void testWhiteSpaceBetweenEncodedWordsGetsRemoved() {
        assertEquals("a", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?="));
        assertEquals("a b", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?= b"));
        assertEquals("ab", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?= =?ISO-8859-1?Q?b?="));
        assertEquals("ab", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?=  =?ISO-8859-1?Q?b?="));
        assertEquals("ab", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?=\r\n  =?ISO-8859-1?Q?b?="));
        assertEquals("a b", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a_b?="));
        assertEquals("a b", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?= =?ISO-8859-2?Q?_b?="));
    }

    // see MIME4J-138
    public void testEncodedTextMayStartWithAnEqualsSign() {
        assertEquals(" foo", DecoderUtil.decodeEncodedWords("=?utf-8?Q?=20foo?="));
        assertEquals("Re: How to place a view at the bottom with a 100% width",
            DecoderUtil.decodeEncodedWords("=?utf-8?Q?Re:=20How=20to=20place=20a=20view=20at=20the=20bottom?= "
                    + "=?utf-8?Q?=20with=20a=20100%=20width?="));
        assertEquals("Test \u00fc and more",
            DecoderUtil.decodeEncodedWords("Test =?ISO-8859-1?Q?=FC_?= =?ISO-8859-1?Q?and_more?="));
    }

    // see MIME4J-142
    public void testEncodedTextMayContainDollarSign() {
        assertEquals("variable ${target.nl}", DecoderUtil.decodeEncodedWords("=?utf-8?Q?variable=20${target.nl}?="));
    }

    public void testNonWhiteSpaceBetweenEncodedWordsIsRetained() {
        assertEquals("a b c", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?= b =?ISO-8859-1?Q?c?="));
        assertEquals("a\rb\nc", DecoderUtil.decodeEncodedWords("=?ISO-8859-1?Q?a?=\rb\n=?ISO-8859-1?Q?c?="));
    }

    public void testTextBeforeAndAfterEncodedWordIsRetained() {
        assertEquals(" a b c ", DecoderUtil.decodeEncodedWords(" =?ISO-8859-1?Q?a?= b =?ISO-8859-1?Q?c?= "));
        assertEquals("! a b c !", DecoderUtil.decodeEncodedWords("! =?ISO-8859-1?Q?a?= b =?ISO-8859-1?Q?c?= !"));
    }

    public void testFunnyInputDoesNotRaiseOutOfMemoryError() {
        // Bug detected on June 7, 2005. Decoding the following string caused OutOfMemoryError.
        assertEquals("=3?!!\\=?\"!g6P\"!Xp:\"!", DecoderUtil.decodeEncodedWords("=3?!!\\=?\"!g6P\"!Xp:\"!"));
    }    
}