using System;

using System.Collections;

using System.Collections.Generic;

using System.Text;

using System.Diagnostics;



namespace WUW01

{

    public class Category

    {

        private string      _name;

        private ArrayList   _prototypes;



        public Category(string name)

        {

            _name = name;

            _prototypes = null;

        }



        public Category(string name, Gesture firstExample)

        {

            _name = name;

            _prototypes = new ArrayList();

            AddExample(firstExample);

        }

        

        public Category(string name, ArrayList examples)

        {

            _name = name;

            _prototypes = new ArrayList(examples.Count);

            for (int i = 0; i < examples.Count; i++)

            {

                Gesture p = (Gesture) examples[i];

                AddExample(p);

            }

        }



        public string Name

        {

            get

            {

                return _name;

            }

        }



        public int NumExamples

        {

            get

            {

                return _prototypes.Count;

            }

        }



        /// <summary>

        /// Indexer that returns the prototype at the given index within

        /// this gesture category, or null if the gesture does not exist.

        /// </summary>

        /// <param name="i"></param>

        /// <returns></returns>

        public Gesture this[int i]

        {

            get

            {

                if (0 <= i && i < _prototypes.Count)

                {

                    return (Gesture) _prototypes[i];

                }

                else

                {

                    return null;

                }

            }

        }



        public void AddExample(Gesture p)

        {

            bool success = true;

            try

            {

                // first, ensure that p's name is right

                string name = ParseName(p.Name);

                if (name != _name)

                    throw new ArgumentException("Prototype name does not equal the name of the category to which it was added.");



                // second, ensure that it doesn't already exist

                for (int i = 0; i < _prototypes.Count; i++)

                {

                    Gesture p0 = (Gesture) _prototypes[i];

                    if (p0.Name == p.Name)

                        throw new ArgumentException("Prototype name was added more than once to its category.");

                }

            }

            catch (ArgumentException ex)

            {

                Console.WriteLine(ex.Message);

                success = false;

            }

            if (success)

            {

                _prototypes.Add(p);

            }

        }



        /// <summary>

        /// Pulls the category name from the gesture name, e.g., "circle" from "circle03".

        /// </summary>

        /// <param name="s"></param>

        /// <returns></returns>

        public static string ParseName(string s)

        {

            string category = String.Empty;

            for (int i = s.Length - 1; i >= 0; i--)

            {

                if (!Char.IsDigit(s[i]))

                {

                    category = s.Substring(0, i + 1);

                    break;

                }

            }

            return category;

        }



    }

}