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/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */
package com.vividsolutions.jtstest.testrunner;

import java.util.Arrays;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import com.vividsolutions.jts.util.Assert;
import com.vividsolutions.jtstest.util.StringUtil;

/**
 * Parameters passed to a main method (also known as "command-line arguments").
 * Arguments are recognized only if they are of the form -key or -key:value
 *
 * @version 1.7
 */
public class Parameters {
    private static List arguments = null;
    private static List requiredKeys = new Vector();
    private static List allowedKeys = new Vector();
    private static Parameters instance = null;

    /**
     * Sets the command-line arguments. reqdKeys may be set to null if there
     * are no required command-line arguments. Same with optionalKeys.
     */
    public static void setParameters(String[] args, String[] reqdKeys, String[] optionalKeys) {
        arguments = Arrays.asList(args);
        if (reqdKeys != null)
            requiredKeys = StringUtil.toLowerCase(Arrays.asList(reqdKeys));
        if (reqdKeys != null)
            allowedKeys.addAll(StringUtil.toLowerCase(Arrays.asList(reqdKeys)));
        if (optionalKeys != null)
            allowedKeys.addAll(StringUtil.toLowerCase(Arrays.asList(optionalKeys)));
    }

    /**
     * Returns the singleton. Be sure to call #setParameters first.
     */
    public static Parameters getInstance() {
        Assert.isTrue(arguments != null);
        if (instance == null)
            instance = new Parameters();
        return instance;
    }
    ////////////////////////////////////////////////////////////////////////////////
    private Hashtable hashtable = new Hashtable();

    /**
     * Creates a Parameters object for the given main-method arguments.
     */
    private Parameters() {
        for (Iterator i = arguments.iterator(); i.hasNext();) {
            String arg = (String) i.next();
            arg = arg.toLowerCase();
            if (!arg.startsWith("-"))
                throw new IllegalArgumentException(
                    "Command-line argument does not start with '-': " + arg);
            int colonIndex = arg.indexOf(":");
            String key;
            String value;
            if (colonIndex >= 0) {
                key = arg.substring(1, colonIndex);
                value = arg.substring(colonIndex + 1);
            } else {
                key = arg.substring(1);
                value = "";
            }
            if (!allowedKeys.contains(key))
                throw new IllegalArgumentException(
                    "Unrecognized command-line argument: "
                        + arg.substring(1)
                        + ". Valid arguments are: "
                        + StringUtil.toCommaDelimitedString(allowedKeys));
            hashtable.put(key, value);
        }
        for (Iterator i = requiredKeys.iterator(); i.hasNext();) {
            String requiredKey = (String) i.next();
            if (!hashtable.containsKey(requiredKey))
                throw new IllegalArgumentException(
                    "Required command-line argument is missing: " + requiredKey);
        }
    }

    /**
     * Returns true if key is one of the parameters. Case-insensitive.
     */
    public boolean contains(String key) {
        Assert.isTrue(allowedKeys.contains(key.toLowerCase()));
        return hashtable.containsKey(key.toLowerCase());
    }

    /**
     * Returns the value of the specified parameter, or null if there is no such key. Case-insensitive.
     */
    public String get(String key) {
        Assert.isTrue(allowedKeys.contains(key.toLowerCase()));
        return (String) hashtable.get(key.toLowerCase());
    }
}