/*
  An application using a generic List of objects.
  In this case we have a List of ToDo items.
  */

import java.lancs.*;

public class Test
{    
  public static ToDo readToDo() throws Exception
  {
    BasicIo.prompt("Priority: ");
    int p = BasicIo.readInteger();
    BasicIo.prompt("Description: ");
    String s  = BasicIo.readString();
    return new ToDo(p,s);
  }/* Read in data and create a ToDo object. */
       
 public static void main(String[] args) throws Exception
  {
    List l1 = new List();
    String prompt =   "Type in command: ";
    String commands = "(end, show, cons, length, add, " +
                      "head, tail, " +
                      "insert, delete, present, reverse, help) ";

    BasicIo.prompt(prompt + commands);
    String command = BasicIo.readString();
    
    while (!command.equals("end"))
      {
	if (command.equals("show"))
	  System.out.println(l1);
	
	if (command.equals("head"))
	  System.out.println(l1.head());

	if (command.equals("tail")){
	  l1 = l1.tail();
	  System.out.println(l1);
	}

	if (command.equals("cons"))
	  System.out.println(l1.cons());

	if (command.equals("length"))
	  System.out.println(l1.length());

	if (command.equals("add")){
	  BasicIo.prompt("Priority: ");
	  int p = BasicIo.readInteger();
	  BasicIo.prompt("Description: ");
	  String s  = BasicIo.readString();
	  ToDo item = new ToDo(p,s);
	  l1 = l1.add(item);
	  System.out.println(l1);
	}

	if (command.equals("insert")){
	  ToDo item = readToDo();
	  l1 = l1.insert(item,new ToDoComp());
	  System.out.println(l1);
	}

	if (command.equals("present")) {
	  BasicIo.prompt("Id No: ");
	  int e = BasicIo.readInteger();	
	  ToDoPred pred = new ToDoPred(e);
	  System.out.println(l1.isPresent(pred));
	}

	if (command.equals("delete")){
	  BasicIo.prompt("Id No: ");
	  int e = BasicIo.readInteger();	
	  ToDoPred pred = new ToDoPred(e);
	  l1 = l1.delete(pred);
	  System.out.println(l1);
	}

	if (command.equals("reverse")){
	  l1 = l1.reverse();
	  System.out.println(l1);}

	if (command.equals("help"))
	  System.out.println(commands);

	BasicIo.prompt(prompt);
	command = BasicIo.readString();
      }
  }
}