ColaFlow/colaflow-api/src/Shared/ColaFlow.Shared.Kernel/Common/ValueObject.cs

namespace ColaFlow.Shared.Kernel.Common;

/// <summary>
/// Base class for all value objects
/// </summary>
public abstract class ValueObject
{
    protected abstract IEnumerable<object> GetAtomicValues();

    public override bool Equals(object? obj)
    {
        if (obj == null || obj.GetType() != GetType())
            return false;

        var other = (ValueObject)obj;
        return GetAtomicValues().SequenceEqual(other.GetAtomicValues());
    }

    public override int GetHashCode()
    {
        return GetAtomicValues()
            .Aggregate(1, (current, obj) =>
            {
                unchecked
                {
                    return (current * 23) + (obj?.GetHashCode() ?? 0);
                }
            });
    }

    public static bool operator ==(ValueObject? a, ValueObject? b)
    {
        if (a is null && b is null)
            return true;

        if (a is null || b is null)
            return false;

        return a.Equals(b);
    }

    public static bool operator !=(ValueObject? a, ValueObject? b)
    {
        return !(a == b);
    }
}