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/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2006 Tim Azzopardi 
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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package org.jruby.util;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import jnr.posix.util.Platform;
import org.jcodings.Encoding;
import org.jruby.Ruby;
import org.jruby.RubyString;

public class OSEnvironment {

    /**
     * Returns the environment as a hash of Ruby strings.
     *
     * @param runtime
     */
    public static Map environmentVariableMap(Ruby runtime) {
        @SuppressWarnings("unchecked")
        Map env = runtime.getInstanceConfig().getEnvironment();
        if ( env != null ) return asMapOfRubyStrings(runtime, env);

        // fall back on empty env when security disallows environment var access (like in an applet)
        if ( Ruby.isSecurityRestricted() ) return Collections.emptyMap();

        return asMapOfRubyStrings(runtime, System.getenv());
    }

    public Map getEnvironmentVariableMap(Ruby runtime) {
        Map envMap = OSEnvironment.environmentVariableMap(runtime);
        return envMap == Collections.EMPTY_MAP ? new HashMap(4) : envMap;
    }

    /**
    * Returns java system properties as a Map.
     * @param runtime
     * @return the java system properties as a Map.
     */
    public static Map systemPropertiesMap(Ruby runtime) {
        if ( Ruby.isSecurityRestricted() ) return Collections.emptyMap();
        return asMapOfRubyStrings(runtime, (Properties) System.getProperties().clone());
    }

    public Map getSystemPropertiesMap(Ruby runtime) {
        Map sysMap = OSEnvironment.systemPropertiesMap(runtime);
        return sysMap == Collections.EMPTY_MAP ? new HashMap(4) : sysMap;
    }

    private static Map asMapOfRubyStrings(final Ruby runtime, final Map map) {
        @SuppressWarnings("unchecked")
        final Map rubyMap = new HashMap(map.size() + 2);
        Encoding encoding = runtime.getEncodingService().getLocaleEncoding();

        // On Windows, entrySet doesn't have corresponding keys for these
        if (Platform.IS_WINDOWS) {
            // these may be null when in a restricted environment (JRUBY-6514)
            String home = SafePropertyAccessor.getProperty("user.home");
            String user = SafePropertyAccessor.getProperty("user.name");
            putRubyKeyValuePair(runtime, rubyMap, "HOME", home == null ? "/" : home, encoding);
            putRubyKeyValuePair(runtime, rubyMap, "USER", user == null ? "" : user, encoding);
        }

        for (Map.Entry entry : map.entrySet()) {
            Object val = entry.getKey();

            if ( ! (val instanceof String) ) continue; // Java devs can stuff non-string objects into env
            final String key = (String) val;

            if (Platform.IS_WINDOWS && key.startsWith("=")) continue;

            val = entry.getValue();
            if ( ! (val instanceof String) ) continue; // Java devs can stuff non-string objects into env

            putRubyKeyValuePair(runtime, rubyMap, key, (String) val, encoding);
        }

        return rubyMap;
    }

    private static void putRubyKeyValuePair(Ruby runtime,
        final Map map,
        String key, String value, Encoding encoding) {
        ByteList keyBytes = new ByteList(key.getBytes(), encoding);
        ByteList valueBytes = new ByteList(value.getBytes(), encoding);

        RubyString keyString = runtime.newString(keyBytes);
        RubyString valueString = runtime.newString(valueBytes);

        keyString.setFrozen(true);
        valueString.setFrozen(true);

        map.put(keyString, valueString);
    }
    
}