import java.util.*;

aspect Options {
  static class Option {
    public String name;
    public boolean hasValue;
    public boolean isCollection;
    public Option(String name, boolean hasValue, boolean isCollection) {
      this.name = name;
      this.hasValue = hasValue;
      this.isCollection = isCollection;
    }
  }
  private static Map Program.options = new HashMap();
  private static Map Program.optionDescriptions = new HashMap();

  private static Set Program.files = new HashSet();
  public static Collection Program.files() {
    return files;
  }

  public static void Program.initOptions() {
    options = new HashMap();
    optionDescriptions = new HashMap();
    files = new HashSet();
  }

  public static void Program.addKeyOption(String name) {
    if(optionDescriptions.containsKey(name))
      throw new Error("Command line definition error: option description for " + name + " is multiply declared");
    optionDescriptions.put(name, new Option(name, false, false));
  }
  
  public static void Program.addKeyValueOption(String name) {
    if(optionDescriptions.containsKey(name))
      throw new Error("Command line definition error: option description for " + name + " is multiply declared");
    optionDescriptions.put(name, new Option(name, true, false));
  }
  
  public static void Program.addKeyCollectionOption(String name) {
    if(optionDescriptions.containsKey(name))
      throw new Error("Command line definition error: option description for " + name + " is multiply declared");
    optionDescriptions.put(name, new Option(name, true, true));
  }
 
  public static void Program.addOptionDescription(String name, boolean value) {
    if(optionDescriptions.containsKey(name))
      throw new Error("Command line definition error: option description for " + name + " is multiply declared");
    optionDescriptions.put(name, new Option(name, value, false));
  }
  public static void Program.addOptionDescription(String name, boolean value, boolean isCollection) {
    if(optionDescriptions.containsKey(name))
      throw new Error("Command line definition error: option description for " + name + " is multiply declared");
    optionDescriptions.put(name, new Option(name, value, isCollection));
  }
  
  public static void Program.addOptions(String[] args) {
    for(int i = 0; i < args.length; i++) {
      String arg = args[i];
      if(arg.startsWith("-")) {
        if(!optionDescriptions.containsKey(arg))
          throw new Error("Command line argument error: option " + arg + " is not defined");
        Option o = (Option)optionDescriptions.get(arg);
        
        if(!o.isCollection && options.containsKey(arg))
          throw new Error("Command line argument error: option " + arg + " is multiply defined");
        
        if(o.hasValue && !o.isCollection) {
          String value = null;
          if(i + 1 > args.length - 1)
            throw new Error("Command line argument error: value missing for key " + arg);
          value = args[i+1];
          if(value.startsWith("-"))
            throw new Error("Command line argument error: value missing for key " + arg);
          i++;
          options.put(arg, value);
        }
        else if(o.hasValue && o.isCollection) {
          String value = null;
          if(i + 1 > args.length - 1)
            throw new Error("Command line argument error: value missing for key " + arg);
          value = args[i+1];
          if(value.startsWith("-"))
            throw new Error("Command line argument error: value missing for key " + arg);
          i++;
          Collection c = (Collection)options.get(arg);
          if(c == null)
            c = new ArrayList();
          c.add(value);
          options.put(arg, c);
        }
        else {
          options.put(arg, null);
        }
      }
      else {
        files.add(arg);
      }
    }
  }
  public static boolean Program.hasOption(String name) {
    return options.containsKey(name);
  }
  public static boolean Program.hasValueForOption(String name) {
    return options.containsKey(name) && options.get(name) != null;
  }
  public static String Program.getValueForOption(String name) {
    if(!hasValueForOption(name))
      throw new Error("Command line argument error: key " + name + " does not have a value");
    return (String)options.get(name);
  }
  public static Collection Program.getValueCollectionForOption(String name) {
    if(!hasValueForOption(name))
      throw new Error("Command line argument error: key " + name + " does not have a value");
    return (Collection)options.get(name);
  }

  public static boolean Program.verbose() {
    return hasOption("-verbose");
  }
}