/// <summary>
/// Stack or removes the given Aura, if possible.
/// Returns whether the given incompatible Aura was removed or stacked.
/// <param name="err">Ok, if stacked or no incompatible Aura was found</param>
/// </summary>
public static bool CheckStackOrOverride(Aura oldAura, CasterInfo caster, Spell spell, ref SpellFailedReason err)
{
if (oldAura.Spell.IsPreventionDebuff)
{
err = SpellFailedReason.AuraBounced;
return false;
}
if (oldAura.Spell.CanStack && oldAura.Spell == spell)
{
// stack aura
oldAura.Stack(caster);
}
else
{
if (caster == oldAura.CasterInfo)
{
if (spell != oldAura.Spell &&
spell.AuraCasterGroup != null &&
spell.AuraCasterGroup == oldAura.Spell.AuraCasterGroup &&
spell.AuraCasterGroup.Count > 1)
{
err = SpellFailedReason.AuraBounced;
return false;
}
}
else if (!spell.CanOverride(oldAura.Spell))
{
err = SpellFailedReason.AuraBounced;
return false;
}
// cancel previously existing Aura
return oldAura.TryRemove(true);
}
return false;
}