using System;
using System.Collections.Generic;
using System.Text;

namespace SalsaModel
{

    enum GrabBy
    {
        Nothing,
        LeftHand,
        RightHand,
    }
    class Hold
    {
        public Hold(GrabBy left, GrabBy right)
        {
            Left = left;
            Right = right;
        }
        public readonly GrabBy Left;
        public readonly GrabBy Right;



        internal GrabBy Get(PositionModel.Side side)
        {
            if (side == PositionModel.Side.Left)
                return Left;
            else
                return Right;
        }

        internal GrabBy GetOther(PositionModel.Side leaderHoldSide)
        {
            return Get(PositionModel.Other(leaderHoldSide));
        }

        /// <summary>
        /// If the hold on the given side is a hand hold, returns the side.
        /// Otherwise, throws.  Really, you should only call this once you know that it's
        /// a hand hold.
        /// </summary>
        internal PositionModel.Side GetHandSide(PositionModel.Side leaderHoldSide)
        {
            switch (Get(leaderHoldSide))
            {
                case GrabBy.Nothing:
                    throw new Exception("Can't lead with nothing");
                case GrabBy.LeftHand:
                    return PositionModel.Side.Left;
                    break;
                case GrabBy.RightHand:
                    return PositionModel.Side.Right;
                    break;
                default:
                    throw new Exception("Grab location " + Get(leaderHoldSide).ToString() + " is not a hand hold");
            }
        }
    }
}