/*

 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import sun.awt.FontConfiguration;

import sun.awt.X11FontManager;

import sun.font.FontUtilities;

import sun.font.SunFontManager;

import sun.util.logging.PlatformLogger;

import java.io.File;

import java.io.FileInputStream;

import java.nio.charset.Charset;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Properties;

import java.util.Scanner;

public class MFontConfiguration extends FontConfiguration {

    private static FontConfiguration fontConfig = null;

    private static PlatformLogger logger;

    public MFontConfiguration(SunFontManager fm) {

        super(fm);

        if (FontUtilities.debugFonts()) {

            logger = PlatformLogger.getLogger("sun.awt.FontConfiguration");

        }

        initTables();

    }

    public MFontConfiguration(SunFontManager fm,

                              boolean preferLocaleFonts,

                              boolean preferPropFonts) {

        super(fm, preferLocaleFonts, preferPropFonts);

        if (FontUtilities.debugFonts()) {

            logger = PlatformLogger.getLogger("sun.awt.FontConfiguration");

        }

        initTables();

    }

    /* Needs to be kept in sync with updates in the languages used in

     * the fontconfig files.

     */

    protected void initReorderMap() {

        reorderMap = new HashMap<>();

        if (osName == null) {  /* null means SunOS */

            initReorderMapForSolaris();

        } else {

            initReorderMapForLinux();

        }

    }

    private void initReorderMapForSolaris() {

        /* Don't create a no-op entry, so we can optimize this case

         * i.e. we don't need to do anything so can avoid slower paths in

         * the code.

         */

//      reorderMap.put("UTF-8", "latin-1");

        reorderMap.put("UTF-8.hi", "devanagari"); // NB is in Lucida.

        reorderMap.put("UTF-8.ja",

                       split("japanese-x0201,japanese-x0208,japanese-x0212"));

        reorderMap.put("UTF-8.ko", "korean-johab");

        reorderMap.put("UTF-8.th", "thai");

        reorderMap.put("UTF-8.zh.TW", "chinese-big5");

        reorderMap.put("UTF-8.zh.HK", split("chinese-big5,chinese-hkscs"));

        if (FontUtilities.isSolaris8) {

            reorderMap.put("UTF-8.zh.CN", split("chinese-gb2312,chinese-big5"));

        } else {

            reorderMap.put("UTF-8.zh.CN",

                           split("chinese-gb18030-0,chinese-gb18030-1"));

        }

        reorderMap.put("UTF-8.zh",

                       split("chinese-big5,chinese-hkscs,chinese-gb18030-0,chinese-gb18030-1"));

        reorderMap.put("Big5", "chinese-big5");

        reorderMap.put("Big5-HKSCS", split("chinese-big5,chinese-hkscs"));

        if (! FontUtilities.isSolaris8 && ! FontUtilities.isSolaris9) {

            reorderMap.put("GB2312", split("chinese-gbk,chinese-gb2312"));

        } else {

            reorderMap.put("GB2312","chinese-gb2312");

        }

        reorderMap.put("x-EUC-TW",

            split("chinese-cns11643-1,chinese-cns11643-2,chinese-cns11643-3"));

        reorderMap.put("GBK", "chinese-gbk");

        reorderMap.put("GB18030",split("chinese-gb18030-0,chinese-gb18030-1"));

        reorderMap.put("TIS-620", "thai");

        reorderMap.put("x-PCK",

                       split("japanese-x0201,japanese-x0208,japanese-x0212"));

        reorderMap.put("x-eucJP-Open",

                       split("japanese-x0201,japanese-x0208,japanese-x0212"));

        reorderMap.put("EUC-KR", "korean");

        /* Don't create a no-op entry, so we can optimize this case */

//      reorderMap.put("ISO-8859-1", "latin-1");

        reorderMap.put("ISO-8859-2", "latin-2");

        reorderMap.put("ISO-8859-5", "cyrillic-iso8859-5");

        reorderMap.put("windows-1251", "cyrillic-cp1251");

        reorderMap.put("KOI8-R", "cyrillic-koi8-r");

        reorderMap.put("ISO-8859-6", "arabic");

        reorderMap.put("ISO-8859-7", "greek");

        reorderMap.put("ISO-8859-8", "hebrew");

        reorderMap.put("ISO-8859-9", "latin-5");

        reorderMap.put("ISO-8859-13", "latin-7");

        reorderMap.put("ISO-8859-15", "latin-9");

    }

    private void initReorderMapForLinux() {

        reorderMap.put("UTF-8.ja.JP", "japanese-iso10646");

        reorderMap.put("UTF-8.ko.KR", "korean-iso10646");

        reorderMap.put("UTF-8.zh.TW", "chinese-tw-iso10646");

        reorderMap.put("UTF-8.zh.HK", "chinese-tw-iso10646");

        reorderMap.put("UTF-8.zh.CN", "chinese-cn-iso10646");

        reorderMap.put("x-euc-jp-linux",

                        split("japanese-x0201,japanese-x0208"));

        reorderMap.put("GB2312", "chinese-gb18030");

        reorderMap.put("Big5", "chinese-big5");

        reorderMap.put("EUC-KR", "korean");

        if (osName.equals("Sun")){

            reorderMap.put("GB18030", "chinese-cn-iso10646");

        }

        else {

            reorderMap.put("GB18030", "chinese-gb18030");

        }

    }

    /**

     * Sets the OS name and version from environment information.

     */

    protected void setOsNameAndVersion(){

        super.setOsNameAndVersion();

        if (osName.equals("SunOS")) {

            //don't care os name on Solaris

            osName = null;

        } else if (osName.equals("Linux")) {

            try {

                File f;

                if ((f = new File("/etc/fedora-release")).canRead()) {

                    osName = "Fedora";

                    osVersion = getVersionString(f);

                } else if ((f = new File("/etc/redhat-release")).canRead()) {

                    osName = "RedHat";

                    osVersion = getVersionString(f);

                } else if ((f = new File("/etc/turbolinux-release")).canRead()) {

                    osName = "Turbo";

                    osVersion = getVersionString(f);

                } else if ((f = new File("/etc/SuSE-release")).canRead()) {

                    osName = "SuSE";

                    osVersion = getVersionString(f);

                } else if ((f = new File("/etc/lsb-release")).canRead()) {

                    /* Ubuntu and (perhaps others) use only lsb-release.

                     * Syntax and encoding is compatible with java properties.

                     * For Ubuntu the ID is "Ubuntu".

                     */

                    Properties props = new Properties();

                    props.load(new FileInputStream(f));

                    osName = props.getProperty("DISTRIB_ID");

                    osVersion =  props.getProperty("DISTRIB_RELEASE");

                }

            } catch (Exception e) {

            }

        }

        return;

    }

    /**

     * Gets the OS version string from a Linux release-specific file.

     */

    private String getVersionString(File f){

        try {

            Scanner sc  = new Scanner(f);

            return sc.findInLine("(\\d)+((\\.)(\\d)+)*");

        }

        catch (Exception e){

        }

        return null;

    }

    private static final String fontsDirPrefix = "$JRE_LIB_FONTS";

    protected String mapFileName(String fileName) {

        if (fileName != null && fileName.startsWith(fontsDirPrefix)) {

            return SunFontManager.jreFontDirName

                    + fileName.substring(fontsDirPrefix.length());

        }

        return fileName;

    }

    // overrides FontConfiguration.getFallbackFamilyName

    public String getFallbackFamilyName(String fontName, String defaultFallback) {

        // maintain compatibility with old font.properties files, which

        // either had aliases for TimesRoman & Co. or defined mappings for them.

        String compatibilityName = getCompatibilityFamilyName(fontName);

        if (compatibilityName != null) {

            return compatibilityName;

        }

        return defaultFallback;

    }

    protected String getEncoding(String awtFontName,

            String characterSubsetName) {

        // extract encoding field from XLFD

        int beginIndex = 0;

        int fieldNum = 13; // charset registry field

        while (fieldNum-- > 0 && beginIndex >= 0) {

            beginIndex = awtFontName.indexOf("-", beginIndex) + 1;

        }

        if (beginIndex == -1) {

            return "default";

        }

        String xlfdEncoding = awtFontName.substring(beginIndex);

        if (xlfdEncoding.indexOf("fontspecific") > 0) {

            if (awtFontName.indexOf("dingbats") > 0) {

            } else if (awtFontName.indexOf("symbol") > 0) {

                return "sun.awt.Symbol";

            }

        }

        String encoding = encodingMap.get(xlfdEncoding);

        if (encoding == null) {

            encoding = "default";

        }

        return encoding;

    }

    protected Charset getDefaultFontCharset(String fontName) {

        return Charset.forName("ISO8859_1");

    }

    protected String getFaceNameFromComponentFontName(String componentFontName) {

        return null;

    }

    protected String getFileNameFromComponentFontName(String componentFontName) {

        // for X11, component font name is XLFD

        // if we have a file name already, just use it; otherwise let's see

        // what the graphics environment can provide

        String fileName = getFileNameFromPlatformName(componentFontName);

        if (fileName != null && fileName.charAt(0) == '/' &&

            !needToSearchForFile(fileName)) {

            return fileName;

        }

        return ((X11FontManager) fontManager).getFileNameFromXLFD(componentFontName);

    }

    public HashSet<String> getAWTFontPathSet() {

        HashSet<String> fontDirs = new HashSet<String>();

        short[] scripts = getCoreScripts(0);

        for (int i = 0; i< scripts.length; i++) {

            String path = getString(table_awtfontpaths[scripts[i]]);

            if (path != null) {

                int start = 0;

                int colon = path.indexOf(':');

                while (colon >= 0) {

                    fontDirs.add(path.substring(start, colon));

                    start = colon + 1;

                    colon = path.indexOf(':', start);

                }

                fontDirs.add((start == 0) ? path : path.substring(start));

            }

        }

        return fontDirs;

    }

    /* methods for table setup ***********************************************/

    private static HashMap<String, String> encodingMap = new HashMap<>();

    private void initTables() {

        // encodingMap maps XLFD encoding component to

        // name of corresponding java.nio charset

        encodingMap.put("iso8859-1", "ISO-8859-1");

        encodingMap.put("iso8859-2", "ISO-8859-2");

        encodingMap.put("iso8859-4", "ISO-8859-4");

        encodingMap.put("iso8859-5", "ISO-8859-5");

        encodingMap.put("iso8859-6", "ISO-8859-6");

        encodingMap.put("iso8859-7", "ISO-8859-7");

        encodingMap.put("iso8859-8", "ISO-8859-8");

        encodingMap.put("iso8859-9", "ISO-8859-9");

        encodingMap.put("iso8859-13", "ISO-8859-13");

        encodingMap.put("iso8859-15", "ISO-8859-15");

        if (osName == null) {

            // use standard converter on Solaris

            encodingMap.put("gbk-0", "GBK");

        } else {

        }

        encodingMap.put("big5-1", "Big5");

        encodingMap.put("big5-0", "Big5");

        encodingMap.put("hkscs-1", "Big5-HKSCS");

        encodingMap.put("ansi-1251", "windows-1251");

        encodingMap.put("koi8-r", "KOI8-R");

        encodingMap.put("tis620.2533-0", "TIS-620");

        encodingMap.put("iso10646-1", "UTF-16BE");

    }

}