using static System.Math;

namespace InnovEnergy.Lib.Units.Composite;

public class AcPower
{
    public Double Apparent { get; internal init; }
    public Double Active   { get; internal init; }
    public Double Reactive { get; internal init; }
    public Double Phi      { get; internal init; }
    public Double CosPhi   { get; internal init; }

    public static AcPower FromVoltageCurrentPhi(Double voltageRms, Double currentRms, Double phi)
    {
        if (voltageRms < 0) throw new ArgumentException("RMS value cannot be negative", nameof(voltageRms));
        if (currentRms < 0) throw new ArgumentException("RMS value cannot be negative", nameof(currentRms));

        phi = NormalizePhi(phi);
        
        var cosPhi   = Cos(phi);
        var apparent = voltageRms * currentRms;

        return new AcPower
        {
            Apparent = apparent,
            Active   = apparent * cosPhi,
            Reactive = apparent * Sin(phi),
            Phi      = phi,
            CosPhi   = cosPhi
        };
    }

    private static Double NormalizePhi(Double phi) => (phi + PI) % Tau - PI; // Tau is 2pi
}