/*

 * Copyright (c) 2009, 2015, 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 build.tools.charsetmapping;

import java.io.*;

import java.util.ArrayList;

import java.util.Scanner;

import java.util.LinkedHashMap;

import java.util.Locale;

public class Main {

    public static void main(String args[]) throws Throwable {

        int SRC_DIR  = 0;

        int DST_DIR  = 1;

        int TYPE     = 2;

        int CHARSETS = 3;

        int OS       = 4;

        int TEMPLATE = 5;

        int EXT_SRC  = 6;

        if (args.length < 3 ) {

            System.out.println("Usage: java -jar charsetmapping.jar src dst spiType charsets os [template]");

            System.exit(1);

        }

        boolean isStandard = "stdcs".equals(args[TYPE]);

        boolean isExtended = "extcs".equals(args[TYPE]);

        if (isStandard || isExtended) {

            LinkedHashMap<String, Charset> charsets = getCharsets(

                new File(args[SRC_DIR], args[CHARSETS]));

            String[] osStdcs = getOSStdCSList(new File(args[SRC_DIR], args[OS]));

            boolean hasBig5_HKSCS = false;

            boolean hasMS950_HKSCS_XP = false;

            for (String name : osStdcs) {

                Charset cs = charsets.get(name);

                if (cs != null) {

                    cs.pkgName = "sun.nio.cs";

                }

                if (name.equals("Big5_HKSCS")) {

                    hasBig5_HKSCS = true;

                } else if (name.equals("MS950_HKSCS_XP")) {

                    hasMS950_HKSCS_XP = true;

                }

            }

            for (Charset cs : charsets.values()) {

                if (isStandard && cs.pkgName.equals("sun.nio.cs.ext") ||

                    isExtended && cs.pkgName.equals("sun.nio.cs")) {

                    continue;

                }

                verbose(cs);

                switch (cs.type) {

                case "template":

                    SRC.genClass(cs, args[EXT_SRC], args[DST_DIR]);

                    break;

                case "sbcs":

                    SBCS.genClass(cs, args[SRC_DIR], args[DST_DIR],

                                  "SingleByte-X.java.template");

                    break;

                case "source":

                    break;                   // source file, do nothing

                default:                     // dbcs

                    DBCS.genClass("dbcs".equals(cs.type) ?

                                      "" :  "_" + cs.type.toUpperCase(Locale.ENGLISH),

                                  cs, args[SRC_DIR], args[DST_DIR],

                                  "DoubleByte-X.java.template");

                }

            }

            // provider StandardCharsets.java / ExtendedCharsets.java

            SPI.genClass(args[TYPE], charsets, args[SRC_DIR], args[DST_DIR], args[TEMPLATE]);

            // HKSCSMapping2008/XP.java goes together with Big5/MS950XP_HKSCS

            if (isStandard && hasBig5_HKSCS || isExtended && !hasBig5_HKSCS) {

                HKSCS.genClass2008(args[SRC_DIR], args[DST_DIR],

                                   isStandard ? "sun.nio.cs" : "sun.nio.cs.ext");

            }

            if (isStandard && hasMS950_HKSCS_XP || isExtended && !hasMS950_HKSCS_XP) {

                HKSCS.genClassXP(args[SRC_DIR], args[DST_DIR],

                                 isStandard ? "sun.nio.cs" : "sun.nio.cs.ext");

            }

        } else if ("euctw".equals(args[TYPE])) {

            EUC_TW.genClass(args);

        } else if ("sjis0213".equals(args[TYPE])) {

            JIS0213.genClass(args);

        } else if ("hkscs".equals(args[TYPE])) {

            HKSCS.genClass2001(args);

        }

    }

    private static LinkedHashMap<String, Charset> getCharsets(File cslist)

        throws Throwable

    {

        LinkedHashMap<String, Charset> charsets = new LinkedHashMap<>();

        try (Scanner s = new Scanner(cslist)) {

            Charset cs = null;

            ArrayList<String> names = new ArrayList<>();

            while (s.hasNextLine()) {

                String line = s.nextLine();

                if (line.startsWith("#") || line.length() == 0) {

                    continue;

                }

                String[] tokens = line.split("\\s+");

                if (tokens.length < 2) {

                    continue;

                }

                if ("charset".equals(tokens[0])) {

                    if (cs != null) {

                        cs.aliases = names.toArray(new String[names.size()]);

                        charsets.put(cs.clzName, cs);

                        cs = null;

                        names.clear();

                    }

                    if (tokens.length < 3) {

                        throw new RuntimeException("Error: incorrect charset line [" + line + "]");

                    }

                    if ((cs = charsets.get(tokens[2])) != null) {

                        throw new RuntimeException("Error: deplicate charset line [" + line + "]");

                    }

                    cs = new Charset();

                    cs.csName = tokens[1];

                    cs.clzName = tokens[2];

                } else {

                    String key = tokens[1];           // leading empty str

                    switch (key) {

                    case "alias":

                        if (tokens.length < 3) {

                            throw new RuntimeException("Error: incorrect alias line [" + line + "]");

                        } else if (names != null) {

                            names.add(tokens[2]);     // ALIAS_NAME

                        }

                        break;

                    case "package":

                        cs.pkgName = tokens[2];

                        break;

                    case "type":

                        cs.type = tokens[2];

                        break;

                    case "hisname":

                        cs.hisName = tokens[2];

                        break;

                    case "ascii":

                        cs.isASCII = Boolean.parseBoolean(tokens[2]);

                        break;

                    case "minmax":

                        cs.b1Min = toInteger(tokens[2]);

                        cs.b1Max = toInteger(tokens[3]);

                        cs.b2Min = toInteger(tokens[4]);

                        cs.b2Max = toInteger(tokens[5]);

                        break;

                    case "internal":

                        cs.isInternal = Boolean.parseBoolean(tokens[2]);

                        break;

                    default:  // ignore

                    }

                }

            }

            if (cs != null) {

                cs.aliases = names.toArray(new String[names.size()]);

                charsets.put(cs.clzName, cs);

            }

        }

        return charsets;

    }

    private static String[] getOSStdCSList(File stdcsos) throws Throwable

    {

        ArrayList<String> names = new ArrayList<>();

        if (stdcsos.exists()) {

            try (Scanner s = new Scanner(stdcsos)) {

                while (s.hasNextLine()) {

                    String line = s.nextLine();

                    int i = line.indexOf('#');

                    if (i != -1) {

                        line = line.substring(0, i);

                    }

                    line = line.trim();

                    if (line.length() != 0) {

                        names.add(line);

                    }

                }

            }

        }

        return names.toArray(new String[names.size()]);

    }

    static void verbose(Charset cs) {

                           cs.clzName, cs.csName, cs.hisName, cs.pkgName, cs.type, cs.isASCII);

    }

    static int toInteger(String s) {

        return (s.startsWith("0x") || s.startsWith("0X"))

               ? Integer.valueOf(s.substring(2), 16)

               : Integer.valueOf(s);

    }

}