using System;
using System.Collections.Generic;
using System.Text;
using SalsaModel.Scheduling;

namespace SalsaModel.Actions
{
    /// <summary>
    /// This action simply tracks the movement of one hand with another.
    /// It is very simple, and makes no attempt to adjust distances or anything.
    /// 
    /// <para /> It is useful in situations where, conceptually, the man is leading
    /// the woman through her frame, but in fact she's the one who actually knows
    /// what's going on!  Eg, SR turn.
    /// </summary>
    class JustFollowWithHand : IAction
    {
        SalsaMover _handFollower;
        PositionModel.Side _followSide;
        SalsaMover _handLeader;
        PositionModel.Side _leadSide;

        public JustFollowWithHand(SalsaMover handFollower, PositionModel.Side followSide, 
            SalsaMover leadingHandOwner, PositionModel.Side leadSide) {
            _handFollower = handFollower;
            _followSide = followSide;
            _handLeader = leadingHandOwner;
            _leadSide = leadSide;
        }

        public void Start()
        {
        }

        public void Update(double percent)
        {
            // we're just following -- no premeditation or anything
            _handFollower.Model.GetArm(_followSide).Wrist 
                = _handLeader.Model.GetArm(_leadSide).Wrist;
            _handFollower.AlignElbow(_followSide, SalsaMover.ElbowStyle.Out);
        }

        public void End()
        {
        }

        public string DescriptiveCode
        {
            get { return "follow hand"; }
        }
    }
}