/** This class creates objects that are personal planners.
*/
public class Planner implements Database {

   /** Default maximum size of planner. */
   private static final int MAXSIZE = 1000;
   
   /** Collection of things that must be done. */
   private Task[] todo;
   /** Number of actual tasks in the planner. */
   private int numtasks;

   /** Create a Planner with the default Database starting size.
   */
   public Planner() {
      this.todo = new Task[STARTSIZE];
      this.numtasks = 0;
   }

   @Override
   public int size() {
      return this.numtasks;
   }

   /** Add an item to the planner, expanding the planner
      if not yet at the maximum size.
      @param o the item to add
      @return true if added, false otherwise
   */
   public boolean add(Object o) {
      if (! (o instanceof Task)) {
         return false;
      }
   
      if (this.numtasks == this.todo.length 
         && this.numtasks < MAXSIZE) { // make bigger
         int newsize = this.numtasks * 2;
         if (newsize > MAXSIZE) {
            newsize = MAXSIZE;
         }
         Task[] temp = new Task[newsize];
         for (int i = 0; i < this.numtasks; i++) {
            temp[i] = this.todo[i];
         }
         this.todo = temp;
      }
   
      this.todo[this.numtasks++] = (Task) o;
      return true;
   }

   @Override
   public void display() {
      for (int i = 0; i < this.numtasks; i++) {
         System.out.println(this.todo[i]);
      }
   }

   @Override
   public Object find(Object o) {
      boolean found = false;
      String s;
      if (! (o instanceof String)) {
         return null;
      }
      else {
         s = (String) o;
      }
   
      for (int i = 0; i < this.numtasks; i++) {
         if (this.todo[i].toString().indexOf(s) >= 0) {
            return this.todo[i];
         }
      }
      return null;
   }

   // method not implemented -------------
   /** Delete an object from the Planner, if there.
       @param o the object to delete
       @return true if removed, false otherwise
   */
   public boolean delete(Object o) {
      return false;
   }

}