using System;

namespace Science.Physics.GeneralPhysics
{
	/// <summary>
	/// ElectricPotentialDifference
	/// </summary>
	public class ElectricPotentialDifference : Scalar
	{
		private void SetDim()
		{
			this.DimensionMass = 1;
			this.DimensionLength = 2;
			this.DimensionTime = -2;
			this.DimensionCharge = -1;
		}
		public ElectricPotentialDifference()
		{
			SetDim();
		}
		public ElectricPotentialDifference(ElectricCharge Q, Capacitance C)
		{
			SetDim();
			this.V = Q.C / C.F;
		}
		public double V
		{
			get{return this.Magnitude;}
			set{this.Magnitude=value;}
		}
		public ElectricPotentialDifference(Resistance R, ElectricCurrent I)
		{
			SetDim();			
			this.Magnitude = R.Ohm*I.A;
		}
        private Scalar.FunctionOfTime ft;
		public ElectricPotentialDifference(MagneticFlux Phi, Time t)
		{
			SetDim();
            ft = Phi.ScalarFunctionOfTime;
	    	Calculus.Function<double,double> func 
                = new Calculus.Function<double,double>(ff);
			this.Magnitude = - Calculus.Differentiation(func, t.s);
		}
        private double ff(double t)
        {
            Time tt = new Time();
            tt.s = t;
            return ft(tt).Magnitude;
        }
		public ElectricPotentialDifference(Inductance L, ElectricCurrent I, Time t)
		{
			SetDim();	
			ii = I;
            this.Magnitude = -L.H * Calculus.Differentiation(
                new Calculus.Function<double,double>(dIdt), t.s);
		}
		private ElectricCurrent ii;
		private double dIdt(double t)
		{
            Time tt = new Time();
            tt.s = t;
			ii.Set(tt);
			return ii.A;
		}
        public override string ToString()
        {
            return base.ToString() + "(V)";
        }
	}
}