/*
 * Copyright (c) 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 com.sun.tools.sjavac;

import java.io.File;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.StringTokenizer;

/**
 * Utilities.
 *
 * <p><b>This is NOT part of any supported API.
 * If you write code that depends on this, you do so at your own
 * risk.  This code and its internal interfaces are subject to change
 * or deletion without notice.</b></p>
 */
public class Util {

    public static String toFileSystemPath(String pkgId) {
        if (pkgId == null || pkgId.length()==0) return null;
        String pn;
        if (pkgId.charAt(0) == ':') {
            // When the module is the default empty module.
            // Do not prepend the module directory, because there is none.
            // Thus :java.foo.bar translates to java/foo/bar (or \)
            pn = pkgId.substring(1).replace('.',File.separatorChar);
        } else {
            // There is a module. Thus jdk.base:java.foo.bar translates
            // into jdk.base/java/foo/bar
            int cp = pkgId.indexOf(':');
            String mn = pkgId.substring(0,cp);
            pn = mn+File.separatorChar+pkgId.substring(cp+1).replace('.',File.separatorChar);
        }
        return pn;
    }

    public static String justPackageName(String pkgName) {
        int c = pkgName.indexOf(":");
        assert(c != -1);
        return pkgName.substring(c+1);
    }

    public static String extractStringOption(String opName, String s) {
        int p = s.indexOf(opName+"=");
        if (p == -1) return null;
        p+=opName.length()+1;
        int pe = s.indexOf(',', p);
        if (pe == -1) pe = s.length();
        return s.substring(p, pe);
    }

    public static int extractIntOption(String opName, String s) {
        int p = s.indexOf(opName+"=");
        if (p == -1) return 0;
        p+=opName.length()+1;
        int pe = s.indexOf(',', p);
        if (pe == -1) pe = s.length();
        int v = 0;
        try {
            v = Integer.parseInt(s.substring(p, pe));
        } catch (Exception e) {}
        return v;
    }

    /**
     * Clean out unwanted sub options supplied inside a primary option.
     * For example to only had portfile remaining from:
     *    settings="--server:id=foo,portfile=bar"
     * do settings = cleanOptions("--server:",Util.set("-portfile"),settings);
     *    now settings equals "--server:portfile=bar"
     *
     * @param optionPrefix The option name, including colon, eg --server:
     * @param allowsSubOptions A set of the allowed sub options, id portfile etc.
     * @param s The option settings string.
     */
    public static String cleanSubOptions(String optionPrefix, Set<String> allowedSubOptions, String s) {
        StringBuilder sb = new StringBuilder();
        if (!s.startsWith(optionPrefix)) return "";
        StringTokenizer st = new StringTokenizer(s.substring(optionPrefix.length()), ",");
        while (st.hasMoreTokens()) {
            String o = st.nextToken();
            int p = o.indexOf('=');
            if (p>0) {
                String key = o.substring(0,p);
                String val = o.substring(p+1);
                if (allowedSubOptions.contains(key)) {
                    if (sb.length() > 0) sb.append(',');
                    sb.append(key+"="+val);
                }
            }
        }
        return sb.toString();
    }

    /**
     * Convenience method to create a set with strings.
     */
    public static Set<String> set(String... ss) {
        Set<String> set = new HashSet<>();
        set.addAll(Arrays.asList(ss));
        return set;
    }

    /**
     * Normalize windows drive letter paths to upper case to enable string
     * comparison.
     *
     * @param file File name to normalize
     * @return The normalized string if file has a drive letter at the beginning,
     *         otherwise the original string.
     */
    public static String normalizeDriveLetter(String file) {
        if (file.length() > 2 && file.charAt(1) == ':') {
            return Character.toUpperCase(file.charAt(0)) + file.substring(1);
        } else if (file.length() > 3 && file.charAt(0) == '*'
                   && file.charAt(2) == ':') {
            // Handle a wildcard * at the beginning of the string.
            return file.substring(0, 1) + Character.toUpperCase(file.charAt(1))
                   + file.substring(2);
        }
        return file;
    }

    /**
     * Locate the setting for the server properties.
     */
    public static String findServerSettings(String[] args) {
        for (String s : args) {
            if (s.startsWith("--server:")) {
                return s;
            }
        }
        return null;
    }
}