using System;

namespace Science.Physics.GeneralPhysics
{
	/// <summary>
	/// CircuitRC
	/// </summary>
	public class CircuitRC
	{
		private Resistance r;
    	private Capacitance c;
		private ElectricPotentialDifference e;
		private ElectricCharge q;
		private bool charging = true;
		public CircuitRC()
		{
		}
		public CircuitRC(Resistance R, Capacitance C, ElectricPotentialDifference E)
		{
			r = R;
			c = C;
			e = E;
		}
		public CircuitRC(Resistance R, Capacitance C, ElectricCharge Q)
		{
			r = R;
			c = C;
			q = Q;
			charging = false;
		}
		public double Charge(Time t)
		{
			if(charging)
			    return c.F*e.V*(1.0 - Math.Exp(-t.s/TimeConstant));
			else
				return q.C*Math.Exp(-t.s/TimeConstant);
		}
		public double Current(Time t)
		{
			if(charging)
				return e.V/r.Ohm*Math.Exp(-t.s/TimeConstant);
			else
				return -q.C/r.Ohm/c.F*Math.Exp(-t.s/TimeConstant);
		}
		public double TimeConstant
		{
			get{return r.Ohm*c.F;}
    	}
	}
}