using System.Collections;

namespace InnovEnergy.Lib.Units.Composite;

public record Ac3Bus : IReadOnlyList<AcPhase>
{
    public required AcPhase   L1        { get; init; }
    public required AcPhase   L2        { get; init; }
    public required AcPhase   L3        { get; init; }
    public required Frequency Frequency { get; init; }

    public AcPower Power => L1.Power + L2.Power + L3.Power;

    public static Ac3Bus Zero => new Ac3Bus
    {
        Frequency = 0,
        L1 = AcPhase.Zero,
        L2 = AcPhase.Zero,
        L3 = AcPhase.Zero,
    };

    public IEnumerator<AcPhase> GetEnumerator()
    {
        yield return L1;
        yield return L2;
        yield return L3;
    }

    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();

    public Int32 Count => 3;

    public AcPhase this[Int32 index] => index switch
    {
        0 => L1,  // it's retarded
        1 => L2,
        2 => L3,
        _ => throw new ArgumentOutOfRangeException(nameof(index))
    };
}