/* ToDOItem
 *
 * COP 3330
 * UCf - Fall 2006
 *
 * Demonstrates use of PriorityQueue, and inheritance
 */

import java.util.*;
 
 public class ToDoItem implements Comparable<ToDoItem> {
 	
 	//instance variables:
 	private int priority;
 	private String description;
 	
 	public ToDoItem(String description, int priority){
 		this.description = description;
 		this.priority = priority;
 	}
 	
 	/////////////////////////////////////////////////////////////////
 	// accessor methods:
 	public String getDescription(){
 		return this.description;
 	}
 	public int getPriority(){
 		return this.priority;
 	}
 	
 	public String toString(){
 		return this.priority + ": " + this.description;
 	}
 	
 	////////////////////////////////////////////////////////////////////
 	// Comparing
 	public boolean equals (Object other){
 		//comparing the actual objects to see if they're the same
 		
 		//first make sure the right type:
 		if (!(other instanceof ToDoItem))
 			return false;
 		
 		ToDoItem o = (ToDoItem)other;//cast so we an call ToDoItem metods
 		
 		if ((this.description.equals(o.description)) && (this.priority == o.priority))
 			//since we are in ToDoItem, we can access other's private variables
 			return true;
 			
 		return false;
 	}
 	
 	public int compareTo(ToDoItem other){
 		//returns -1, 0, 1 depending on how this compares to other
 		//no casting necessary, because other is a ToDoItem (specified in type parameter of Comparable)
 		//This comparison is for priority, or for ordering...
 		if (this.equals(other))
 			return 0;//they're equal
 		
 		if (this.priority > other.priority)
 			return -1; //this is stronger
 		else if (this.priority < other.priority)
 			return 1;//other is stronger
 		else 
 			return this.description.compareTo(other.description);//must resort to comparing strings
 	}

	/////////////////////////////////////////////////////////////////
	// static methods:
	
	public static void main (String [] args) {
		ToDoItem item1 = new ToDoItem("do something", 5);
		ToDoItem item2 = new ToDoItem("do something else", 10);
		
		PriorityQueue <ToDoItem> toDoList = new PriorityQueue<ToDoItem>();
		
		toDoList.add(item1);
		toDoList.add(item2);
		
		//print whole list:
		System.out.println("Call PriorityQueue's toString to get list:\n" + toDoList);
		
		//get items one at a time:
		System.out.println("----------------------------------");
		ToDoItem item = toDoList.poll();
		while (item != null){
			System.out.println(item);
			System.out.println("<<Press Enter when done with item>>");
			ToDoItem.waitEnter();
			item = toDoList.poll();
		}
		System.out.println("--------------------------------\nNo more items, you're done!");
	}
	
	public static void waitEnter(){
		Scanner ent = new Scanner(System.in);
		ent.nextLine();
	}
 }