idle-survivors/Assets/Scripts/Attribute.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[Serializable]
public struct Attribute
{
    public long Base;

    public Attribute(long stat) { Base = stat; }

    /// <summary>
    /// Calculates the stat value with accumulated buff and debuff modifiers.
    /// </summary>
    /// <returns>(base + baseBonus) * (100% + permyriadBonus) + flatBonus, bounded below by 0.</returns>
    public long Calc(EffectSO effect)
    {
        var r = Base + effect.Base;
        var m = effect.Permyriad + 10000;
        r = r * (m / 10000) + (r / 10000) * (m % 10000) + effect.Flat;
        if (r <= 0)
        {
            return 0;
        }
        return r;
    }
}