package main

import "fmt"

type Attributes struct {
	node     *Node // Ref
	Category string
	Others   map[string]float64
}

func (a *Attributes) Parse(node *Node) error {
	if node.Key() != "attributes" {
		return fmt.Errorf("not attributes")
	}
	a.node = node
	for _, kid := range node.Children {
		if kid.Key() == "category" {
			a.Category = kid.Value()
		} else {
			a.Others[kid.Key()] = kid.ValueFloat64()
		}
	}
	return nil
}

func (a *Attributes) Update() error {
	if a.node == nil {
		return fmt.Errorf("no node, attributes")
	}
	a.node.RmAllChildren()
	n := a.node.NewChild()
	n.Set("category", a.Category)
	for k, v := range a.Others {
		n := a.node.NewChild()
		n.Set(k, v)
	}
	return nil
}