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

namespace SalsaModel.Actions
{
    class MoveHand : IAction
    {
        readonly PositionModel.Side _side;
        readonly SalsaMover _mover;
        readonly Location _relativeDest;
        Location _startPos;

        /// <summary>
        /// Sets up an action to move the specified hand, to a location
        /// relative to the point at the center of the hips, rotated 
        /// according to the wall.
        /// </summary>
        /// <param name="side">which hand to move</param>
        /// <param name="mover">mover to animate</param>
        /// <param name="to">destination position of hand, relative to the point at the 
        /// center of the hips.  The Y axis is forwards along the wall.</param>
        public MoveHand(PositionModel.Side side, SalsaMover mover, Location to)
        {
            _side = side;
            _mover = mover;
            _relativeDest = to;
        }

        public void Start()
        {
            _startPos = _mover.Model.AbsToRelPos(_mover.Model.GetArm(_side).Wrist);
        }

        public void Update(double percent)
        {
            _mover.Model.GetArm(_side).Wrist
                = _mover.Model.RelToAbsPos(_startPos.FractionTo(_relativeDest, percent));
            _mover.AlignElbow(_side, SalsaMover.ElbowStyle.Out);
        }

        public void End()
        {
        }

        public string DescriptiveCode
        {
            get { return "Hand"; }
        }
    }
}