/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jena.cmd;

import static java.util.Arrays.asList;

import java.util.ArrayList ;
import java.util.Iterator ;
import java.util.List ;

/** A command line argument specification. */
public class ArgDecl
{
    boolean takesValue ;
    
    List<String> names = new ArrayList<>() ;
	
    public static final boolean HasValue = true ;
    public static final boolean NoValue = false ;

   /** Create a declaration for a command argument.
    *
    * @param hasValue  Does it take a value or not?
    */
   public ArgDecl(boolean hasValue)
   {
       takesValue = hasValue ;
   }

   /** Create a declaration for a command argument.
    *
    * @param hasValue  Does it take a value or not?
    * @param names     Names of arguments
    */
   public ArgDecl(boolean hasValue, String... names)
   {
       this(hasValue) ;
       asList(names).forEach(this::addName);
   }
   
    public void addName(String name)
    {
        name = canonicalForm(name) ;
        if ( ! names.contains(name))
            names.add(name) ;
    }
    
    public String getKeyName() { return names.get(0) ; }
    
    public List<String> getNames() { return names ; }
    public Iterator<String> names() { return names.iterator() ; }
    
    public boolean takesValue() { return takesValue ; }
    
    public boolean matches(Arg a)
    {
    	 	String name = a.getName();
    		return names.stream().anyMatch(name::equals);
    }
    
    public boolean matches(String arg)
    {
        arg = canonicalForm(arg) ;
        return names.contains(arg) ;
    }
    
    public static String canonicalForm(String str)
    {
        if ( str.startsWith("--") )
            return str.substring(2) ;
        
        if ( str.startsWith("-") )
            return str.substring(1) ;
        
        return str ;
    }
}