/*
 * 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.pdfbox.pdmodel.font;

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

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.pdfbox.Loader;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSInteger;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.Standard14Fonts.FontName;
import org.apache.pdfbox.pdmodel.font.encoding.DictionaryEncoding;
import org.apache.pdfbox.pdmodel.font.encoding.MacRomanEncoding;
import org.apache.pdfbox.pdmodel.font.encoding.WinAnsiEncoding;
import org.apache.pdfbox.text.PDFTextStripper;
import org.junit.jupiter.api.Test;

/**
 * Tests font encoding.
 *
 */
class TestFontEncoding
{
    /**
     * Test the add method of a font encoding.
     */
    @Test
    void testAdd()
    {
        // see PDFDBOX-3332
        int codeForSpace = WinAnsiEncoding.INSTANCE.getNameToCodeMap().get("space");
        assertEquals(32, codeForSpace);

        codeForSpace = MacRomanEncoding.INSTANCE.getNameToCodeMap().get("space");
        assertEquals(32, codeForSpace);
    }

    @Test
    void testOverwrite()
    {
        // see PDFDBOX-3332
        COSDictionary dictEncodingDict = new COSDictionary();
        dictEncodingDict.setItem(COSName.TYPE, COSName.ENCODING);
        dictEncodingDict.setItem(COSName.BASE_ENCODING, COSName.WIN_ANSI_ENCODING);
        COSArray differences = new COSArray();
        differences.add(COSInteger.get(32));
        differences.add(COSName.getPDFName("a"));
        dictEncodingDict.setItem(COSName.DIFFERENCES, differences);
        DictionaryEncoding dictEncoding = new DictionaryEncoding(dictEncodingDict, false, null);
        assertNull(dictEncoding.getNameToCodeMap().get("space"));
        assertEquals(32, dictEncoding.getNameToCodeMap().get("a").intValue());
    }

    /**
     * PDFBOX-3826: Some unicodes are reached by several names in glyphlist.txt, e.g. tilde and
     * ilde.
     *
     * @throws IOException
     */
    @Test
    void testPDFBox3884() throws IOException
    {
        ByteArrayOutputStream baos;
        try (PDDocument doc = new PDDocument())
        {
            PDPage page = new PDPage();
            doc.addPage(page);
            try (PDPageContentStream cs = new PDPageContentStream(doc, page))
            {
                cs.setFont(new PDType1Font(FontName.HELVETICA), 20);
                cs.beginText();
                cs.newLineAtOffset(100, 700);
                // first tilde is "asciitilde" (from the keyboard), 2nd tilde is "tilde"
                // using ˜ would bring IllegalArgumentException prior to bugfix
                cs.showText("~˜");
                cs.endText();
            }
            baos = new ByteArrayOutputStream();
            doc.save(baos);
        }

        // verify
        try (PDDocument doc = Loader.loadPDF(baos.toByteArray()))
        {
            PDFTextStripper stripper = new PDFTextStripper();
            String text = stripper.getText(doc);
            assertEquals("~˜", text.trim());
        }
    }
}
