/*
 * Copyright (c) 2000, 2007, 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.
 */

package sun.awt.motif;

import java.awt.Font;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Locale;
import java.util.logging.Logger;
import java.util.Properties;
import java.util.Scanner;
import sun.awt.FontConfiguration;
import sun.awt.X11GraphicsEnvironment;
import sun.java2d.SunGraphicsEnvironment;
import java.nio.charset.Charset;

public class MFontConfiguration extends FontConfiguration {

    private static FontConfiguration fontConfig = null;
    private static Logger logger;

    public MFontConfiguration(SunGraphicsEnvironment environment) {
        super(environment);
        if (SunGraphicsEnvironment.debugFonts) {
            logger = Logger.getLogger("sun.awt.FontConfiguration");
        }
        initTables();
    }


    public MFontConfiguration(SunGraphicsEnvironment environment,
                              boolean preferLocaleFonts,
                              boolean preferPropFonts) {
        super(environment, preferLocaleFonts, preferPropFonts);
        if (SunGraphicsEnvironment.debugFonts) {
            logger = Logger.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 (sun.font.FontManager.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 (! sun.font.FontManager.isSolaris8 && ! sun.font.FontManager.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.
/**
     * 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/sun-release")).canRead()) {
                    osName = "Sun";
                    osVersion = getVersionString(f);
                } else if ((f = new File("/etc/fedora-release")).canRead()) {
                    osName = "Fedora";
                    osVersion = getVersionString(f);
                } else if ((f = new File("/etc/redhat-release")).canRead()) {
                    osName = "RedHat";
                    // At this time we don't need to distinguish
                    // between RHEL 6.0 and RHEL 6.1 for example.
                    osVersion = getMajorVersionString(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.
/**
     * 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;
    }

    
Gets the OS major version string from a Linux release-specific file.
/**
     * Gets the OS major version string from a Linux release-specific file.
     */
    private String getMajorVersionString(File f){
        try {
            Scanner sc  = new Scanner(f);
            return sc.findInLine("(\\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 SunGraphicsEnvironment.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) {
                return "sun.awt.motif.X11Dingbats";
            } else if (awtFontName.indexOf("symbol") > 0) {
                return "sun.awt.Symbol";
            }
        }
        String encoding = (String) encodingMap.get(xlfdEncoding);
        if (encoding == null) {
            encoding = "default";
        }
        return encoding;
    }

    protected Charset getDefaultFontCharset(String fontName) {
        return Charset.forName("ISO8859_1");
    }

    /* methods for Motif support *********************************************/

    private String[][] motifFontSets = new String[NUM_FONTS][NUM_STYLES];

    public String getMotifFontSet(String fontName, int style) {
        assert isLogicalFontFamilyName(fontName);
        fontName = fontName.toLowerCase(Locale.ENGLISH);
        int fontIndex = getFontIndex(fontName);
        int styleIndex = getStyleIndex(style);
        return getMotifFontSet(fontIndex, styleIndex);
    }

    private String getMotifFontSet(int fontIndex, int styleIndex) {
        String fontSet = motifFontSets[fontIndex][styleIndex];
        if (fontSet == null) {
            fontSet = buildMotifFontSet(fontIndex, styleIndex);
            motifFontSets[fontIndex][styleIndex] = fontSet;
        }
        return fontSet;
    }

    private String buildMotifFontSet(int fontIndex, int styleIndex) {
        StringBuilder buffer = new StringBuilder();
        short[] scripts = getCoreScripts(fontIndex);
        for (int i = 0; i < scripts.length; i++) {
            short nameID = getComponentFontIDMotif(scripts[i], fontIndex, styleIndex);
            if (nameID == 0) {
                nameID = getComponentFontID(scripts[i], fontIndex, styleIndex);
            }
            String name = getComponentFontName(nameID);
            if (name == null || name.endsWith("fontspecific")) {
                continue;
            }
            if (buffer.length() > 0) {
                buffer.append(',');
            }
            buffer.append(name);
        }
        return buffer.toString();
    }

    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 ((X11GraphicsEnvironment) environment).getFileNameFromXLFD(componentFontName);
    }

    
Get default font for Motif widgets to use, preventing them from
wasting time accessing inappropriate X resources.  This is called
only from native code.
This is part of a Motif specific performance enhancement.  By
default, when Motif widgets are created and initialized, Motif will
set up default fonts for the widgets, which we ALWAYS override.
This set up includes finding the default font in the widget's X
resources and fairly expensive requests of the X server to identify
the specific font or fontset.  We avoid all of this overhead by
providing a well known font to use at the creation of widgets, where
possible.
The X11 fonts are specified by XLFD strings which have %d as a
marker to indicate where the fontsize should be substituted.  [The
libc function sprintf() is used to replace it.]  The value 140
specifies a font size of 14 points.
/**
     * Get default font for Motif widgets to use, preventing them from
     * wasting time accessing inappropriate X resources.  This is called
     * only from native code.
     *
     * This is part of a Motif specific performance enhancement.  By
     * default, when Motif widgets are created and initialized, Motif will
     * set up default fonts for the widgets, which we ALWAYS override.
     * This set up includes finding the default font in the widget's X
     * resources and fairly expensive requests of the X server to identify
     * the specific font or fontset.  We avoid all of this overhead by
     * providing a well known font to use at the creation of widgets, where
     * possible.
     *
     * The X11 fonts are specified by XLFD strings which have %d as a
     * marker to indicate where the fontsize should be substituted.  [The
     * libc function sprintf() is used to replace it.]  The value 140
     * specifies a font size of 14 points.
     */
    private static String getDefaultMotifFontSet() {
        String font = ((MFontConfiguration) getFontConfiguration()).getMotifFontSet("sansserif", Font.PLAIN);
        if (font != null) {
            int i;
            while ((i = font.indexOf("%d")) >= 0) {
                font = font.substring(0, i) + "140" + font.substring(i+2);
            }
        }
        return font;
    }

    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 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");
        encodingMap.put("gb2312.1980-0", "sun.awt.motif.X11GB2312");
        if (osName == null) {
            // use standard converter on Solaris
            encodingMap.put("gbk-0", "GBK");
        } else {
            encodingMap.put("gbk-0", "sun.awt.motif.X11GBK");
        }
        encodingMap.put("gb18030.2000-0", "sun.awt.motif.X11GB18030_0");
        encodingMap.put("gb18030.2000-1", "sun.awt.motif.X11GB18030_1");
        encodingMap.put("cns11643-1", "sun.awt.motif.X11CNS11643P1");
        encodingMap.put("cns11643-2", "sun.awt.motif.X11CNS11643P2");
        encodingMap.put("cns11643-3", "sun.awt.motif.X11CNS11643P3");
        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("jisx0201.1976-0", "sun.awt.motif.X11JIS0201");
        encodingMap.put("jisx0208.1983-0", "sun.awt.motif.X11JIS0208");
        encodingMap.put("jisx0212.1990-0", "sun.awt.motif.X11JIS0212");
        encodingMap.put("ksc5601.1987-0", "sun.awt.motif.X11KSC5601");
        encodingMap.put("ksc5601.1992-3", "sun.awt.motif.X11Johab");
        encodingMap.put("tis620.2533-0", "TIS-620");
        encodingMap.put("iso10646-1", "UTF-16BE");
    }

}