using System;

namespace Science.Physics.GeneralPhysics
{
	/// <summary>
	/// Position
	/// </summary>
	public class Position : Vector
	{
        private void SetDim()
		{
			this.DimensionMass = 1;
			this.DimensionLength = 0;
			this.DimensionTime = 0;
		}
		public Position()
		{
			SetDim();
		}

        public Position(Vector.FunctionOfTime func)
            : base(func)
		{
			SetDim();
		}

		private Velocity velo;
		private int component;

		public Position(Time tInitial, Position xInitial, 
			Velocity v, Time tFinal) 
		{
			SetDim();
			velo = v;

            Calculus.Function<double,double> del2
                = new Calculus.Function<double,double>(Func2);
        	component = 0;
            this.X = xInitial.X + Calculus.Integration1D(del2, tInitial.s, tFinal.s);
			component = 1;
            this.Y = xInitial.Y + Calculus.Integration1D(del2, tInitial.s, tFinal.s);
            component = 2;
            this.Z = xInitial.Z + Calculus.Integration1D(del2, tInitial.s, tFinal.s);
    	}	
		private double Func2(double t)
		{
            Time time = new Time();
            time.s = t;
			velo.Set(time);
			if(component==0) return velo.X;
			else if(component==1) return velo.Y;
			else return velo.Z;
		}
		public double m
		{
			get{return this.Norm;}
		}
        public override string ToString()
        {
            return base.ToString() + "(m)";
        }
	}
}