/*

 * Copyright (c) 2002, 2012, 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 compileproperties;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.Writer;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import java.util.Properties;

/** Translates a .properties file into a .java file containing the

 *  definition of a java.util.Properties subclass which can then be

 *  compiled with javac. <P>

 *

 *  Usage: java CompileProperties [path to .properties file] [path to .java file to be output] [super class]

 *

 *  Infers the package by looking at the common suffix of the two

 *  inputs, eliminating "classes" from it.

 *

 * @author Scott Violet

 * @author Kenneth Russell

 */

public class CompileProperties {

    public static void main(String[] args) {

        CompileProperties cp = new CompileProperties();

        boolean ok = cp.run(args);

        if ( !ok ) {

            System.exit(1);

        }

    }

    public static interface Log {

        void info(String msg);

        void verbose(String msg);

        void error(String msg, Exception e);

    }

    private String propfiles[];

    private String outfiles[] ;

    private String supers[]   ;

    private int compileCount = 0;

    private boolean quiet = false;

    public Log log;

    public void setLog(Log log) {

        this.log = log;

    }

    public boolean run(String[] args) {

        if (log == null) {

            log = new Log() {

                public void error(String msg, Exception e) {

                    System.err.println("ERROR: CompileProperties: " + msg);

                    if ( e != null ) {

                        System.err.println("EXCEPTION: " + e.toString());

                        e.printStackTrace();

                    }

                }

                public void info(String msg) {

                    System.out.println(msg);

                }

                public void verbose(String msg) {

                    if (!quiet)

                        System.out.println(msg);

                }

            };

        }

        boolean ok = true;

        /* Original usage */

        if (args.length == 2 && args[0].charAt(0) != '-' ) {

            ok = createFile(args[0], args[1], "java.util.ListResourceBundle");

        } else if (args.length == 3) {

            ok = createFile(args[0], args[1], args[2]);

        } else if (args.length == 0) {

            usage(log);

            ok = false;

        } else {

            /* New batch usage */

            ok = parseOptions(args);

            if ( ok && compileCount == 0 ) {

                log.error("options parsed but no files to compile", null);

                ok = false;

            }

            /* Need at least one file. */

            if ( !ok ) {

                usage(log);

            } else {

                /* Process files */

                for ( int i = 0; i < compileCount && ok ; i++ ) {

                    ok = createFile(propfiles[i], outfiles[i], supers[i]);

                }

            }

        }

        return ok;

    }

    private boolean parseOptions(String args[]) {

        boolean ok = true;

        if ( compileCount > 0 ) {

            String new_propfiles[] = new String[compileCount + args.length];

            String new_outfiles[]  = new String[compileCount + args.length];

            String new_supers[]    = new String[compileCount + args.length];

            System.arraycopy(propfiles, 0, new_propfiles, 0, compileCount);

            System.arraycopy(outfiles, 0, new_outfiles, 0, compileCount);

            System.arraycopy(supers, 0, new_supers, 0, compileCount);

            propfiles = new_propfiles;

            outfiles  = new_outfiles;

            supers    = new_supers;

        } else {

            propfiles = new String[args.length];

            outfiles  = new String[args.length];

            supers    = new String[args.length];

        }

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

            if ( "-compile".equals(args[i]) && i+3 < args.length ) {

                propfiles[compileCount] = args[++i];

                outfiles[compileCount]  = args[++i];

                supers[compileCount]    = args[++i];

                compileCount++;

            } else if ( "-optionsfile".equals(args[i]) && i+1 < args.length ) {

                String filename = args[++i];

                FileInputStream finput = null;

                byte contents[] = null;

                try {

                    finput = new FileInputStream(filename);

                    int byteCount = finput.available();

                    if ( byteCount <= 0 ) {

                        log.error("The -optionsfile file is empty", null);

                        ok = false;

                    } else {

                        contents = new byte[byteCount];

                        int bytesRead = finput.read(contents);

                        if ( byteCount != bytesRead ) {

                            log.error("Cannot read all of -optionsfile file", null);

                            ok = false;

                        }

                    }

                } catch ( IOException e ) {

                    log.error("cannot open " + filename, e);

                    ok = false;

                }

                if ( finput != null ) {

                    try {

                        finput.close();

                    } catch ( IOException e ) {

                        ok = false;

                        log.error("cannot close " + filename, e);

                    }

                }

                if ( ok = true && contents != null ) {

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

                    if ( tokens.length > 0 ) {

                        ok = parseOptions(tokens);

                    }

                }

                if ( !ok ) {

                    break;

                }

            } else if ( "-quiet".equals(args[i]) ) {

                quiet = true;

            } else {

                log.error("argument error", null);

                ok = false;

            }

        }

        return ok;

    }

    private boolean createFile(String propertiesPath, String outputPath,

            String superClass) {

        boolean ok = true;

        log.verbose("parsing: " + propertiesPath);

        Properties p = new Properties();

        try {

            p.load(new FileInputStream(propertiesPath));

        } catch ( FileNotFoundException e ) {

            ok = false;

            log.error("Cannot find file " + propertiesPath, e);

        } catch ( IOException e ) {

            ok = false;

            log.error("IO error on file " + propertiesPath, e);

        }

        if ( ok ) {

            String packageName = inferPackageName(propertiesPath, outputPath);

            log.verbose("inferred package name: " + packageName);

            List<String> sortedKeys = new ArrayList<String>();

            for ( Object key : p.keySet() ) {

                sortedKeys.add((String)key);

            }

            Collections.sort(sortedKeys);

            Iterator<String> keys = sortedKeys.iterator();

            StringBuffer data = new StringBuffer();

            while (keys.hasNext()) {

                String key = keys.next();

                data.append("            { \"" + escape(key) + "\", \"" +

                        escape((String)p.get(key)) + "\" },\n");

            }

            // Get class name from java filename, not the properties filename.

            //   (zh_TW properties might be used to create zh_HK files)

            File file = new File(outputPath);

            String name = file.getName();

            int dotIndex = name.lastIndexOf('.');

            String className;

            if (dotIndex == -1) {

                className = name;

            } else {

                className = name.substring(0, dotIndex);

            }

            String packageString = "";

            if (packageName != null && !packageName.equals("")) {

                packageString = "package " + packageName + ";\n\n";

            }

            Writer writer = null;

            try {

                writer = new BufferedWriter(

                        new OutputStreamWriter(new FileOutputStream(outputPath), "8859_1"));

                MessageFormat format = new MessageFormat(FORMAT);

                writer.write(format.format(new Object[] { packageString, className, superClass, data }));

            } catch ( IOException e ) {

                ok = false;

                log.error("IO error writing to file " + outputPath, e);

            }

            if ( writer != null ) {

                try {

                    writer.flush();

                } catch ( IOException e ) {

                    ok = false;

                    log.error("IO error flush " + outputPath, e);

                }

                try {

                    writer.close();

                } catch ( IOException e ) {

                    ok = false;

                    log.error("IO error close " + outputPath, e);

                }

            }

            log.verbose("wrote: " + outputPath);

        }

        return ok;

    }

    private static void usage(Log log) {

        log.info("usage:");

        log.info("    java CompileProperties path_to_properties_file path_to_java_output_file [super_class]");

        log.info("      -OR-");

        log.info("    java CompileProperties {-compile path_to_properties_file path_to_java_output_file super_class} -or- -optionsfile filename");

        log.info("");

        log.info("Example:");

        log.info("    java CompileProperties -compile test.properties test.java java.util.ListResourceBundle");

        log.info("    java CompileProperties -optionsfile option_file");

        log.info("option_file contains: -compile test.properties test.java java.util.ListResourceBundle");

    }

    private static String escape(String theString) {

        // This is taken from Properties.saveConvert with changes for Java strings

        int len = theString.length();

        StringBuffer outBuffer = new StringBuffer(len*2);

        for(int x=0; x<len; x++) {

            char aChar = theString.charAt(x);

            switch(aChar) {

                case '\\':outBuffer.append('\\'); outBuffer.append('\\');

                break;

                case '\t':outBuffer.append('\\'); outBuffer.append('t');

                break;

                case '\n':outBuffer.append('\\'); outBuffer.append('n');

                break;

                case '\r':outBuffer.append('\\'); outBuffer.append('r');

                break;

                case '\f':outBuffer.append('\\'); outBuffer.append('f');

                break;

                default:

                    if ((aChar < 0x0020) || (aChar > 0x007e)) {

                        outBuffer.append('\\');

                        outBuffer.append('u');

                        outBuffer.append(toHex((aChar >> 12) & 0xF));

                        outBuffer.append(toHex((aChar >>  8) & 0xF));

                        outBuffer.append(toHex((aChar >>  4) & 0xF));

                        outBuffer.append(toHex( aChar        & 0xF));

                    } else {

                        if (specialSaveChars.indexOf(aChar) != -1) {

                            outBuffer.append('\\');

                        }

                        outBuffer.append(aChar);

                    }

            }

        }

        return outBuffer.toString();

    }

    private static String inferPackageName(String inputPath, String outputPath) {

        // Normalize file names

        inputPath  = new File(inputPath).getPath();

        outputPath = new File(outputPath).getPath();

        // Split into components

        String sep;

        if (File.separatorChar == '\\') {

            sep = "\\\\";

        } else {

            sep = File.separator;

        }

        String[] inputs  = inputPath.split(sep);

        String[] outputs = outputPath.split(sep);

        // Match common names, eliminating first "classes" entry from

        // each if present

        int inStart  = 0;

        int inEnd    = inputs.length - 2;

        int outEnd   = outputs.length - 2;

        int i = inEnd;

        int j = outEnd;

        while (i >= 0 && j >= 0) {

            // If a dir contains a dot, it's not a valid package and most likely

            // a module name.

            if (!inputs[i].equals(outputs[j]) ||

                    (inputs[i].equals("gensrc") && outputs[j].equals("gensrc")) ||

                    (inputs[i].contains("."))) {

                ++i;

                ++j;

                break;

            }

            --i;

            --j;

        }

        String result;

        if (i < 0 || j < 0 || i >= inEnd || j >= outEnd) {

            result = "";

        } else {

            inStart = i;

            StringBuffer buf = new StringBuffer();

            for (i = inStart; i <= inEnd; i++) {

                buf.append(inputs[i]);

                if (i < inEnd) {

                    buf.append('.');

                }

            }

            result = buf.toString();

        }

        return result;

    }

    private static final String FORMAT =

            "{0}" +

            "public final class {1} extends {2} '{'\n" +

            "    protected final Object[][] getContents() '{'\n" +

            "        return new Object[][] '{'\n" +

            "{3}" +

            "        };\n" +

            "    }\n" +

            "}\n";

    // This comes from Properties

    private static char toHex(int nibble) {

        return hexDigit[(nibble & 0xF)];

    }

    // This comes from Properties

    private static final char[] hexDigit = {

        '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'

    };

    // Note: different from that in Properties

    private static final String specialSaveChars = "\"";

}