using System;

using System.Collections.Generic;

using System.Text;



namespace TuringMachine.StateAutomat

{

    public class State 

    {

        #region Private members

        private String name;

        private StateType type;        

        private Dictionary<char, State> transactionTable = null;

        #endregion



        #region Properties

        public StateType Type

        {

            get { return type; }

            set { type = value; }

        }

        public String Name

        {

            get { return name; }

            set { name = value; }

        }

        #endregion



        #region Constructors

        public State()

        {

            transactionTable = new Dictionary<char, State>();

            name = string.Empty;

            type = StateType.Unknown;

        }

        public State(String name)

        {

            transactionTable = new Dictionary<char, State>();

            name = name;

            type = StateType.Unknown;

        }

        public State(String name, StateType type)

        {

            transactionTable = new Dictionary<char, State>();

            name = name;

            type = type;

        }

        #endregion



        #region Public methods

        public Boolean IsStart()

        {

            return (type == StateType.StartState);

        }

        public Boolean IsHalt()

        {

            return (type == StateType.HaltState);

        }

        public State GetNextState(char inputChar)

        {

            if (transactionTable.ContainsKey(inputChar))

            {

                return transactionTable[inputChar];

            }

            else

            {

                return null;

            }

        }

        public void AddTransition(char inputChar, State nextState)

        {

            if (transactionTable.ContainsKey(inputChar))

            {

                throw new Exception("Already exist transaction from state '" + this.Name + "' with character '" + inputChar + "'");

            }

            else

            {

                transactionTable.Add(inputChar, nextState);

            }

        }        

        #endregion

    }

}