package system

import "git.tebibyte.media/tomo/tomo"

type attrHierarchy [T tomo.Attr] struct {
	style T
	user  T
	userExists bool
}

func (this *attrHierarchy[T]) SetStyle (style T) (different bool) {
	styleEquals := this.style.Equals(style)
	this.style = style
	return !styleEquals && !this.userExists
}

func (this *attrHierarchy[T]) SetUser (user T) (different bool) {
	userEquals := this.user.Equals(user)
	this.user = user
	this.userExists = true
	return !userEquals
}

func (this *attrHierarchy[T]) Set (attr T, user bool) (different bool) {
	if user {
		return this.SetUser(attr)
	} else {
		return this.SetStyle(attr)
	}
}

func (this *attrHierarchy[T]) Value () T {
	if this.userExists {
		return this.user
	} else {
		return this.style
	}
}