package stub

/*
	простая реализация модели документа
*/

import (
	"odf/model"
	"ypk/assert"
)

type sn struct {
	name     model.LeafName
	attr     map[model.AttrName]model.Attribute
	children []model.Leaf
}

func (n *sn) Attr(name model.AttrName, val ...model.Attribute) model.Attribute {
	assert.For(len(val) <= 1, 20, "only one attribute accepted")
	assert.For(name != "", 21)
	if len(val) == 1 {
		n.attr[name] = val[0]
	}
	return n.attr[name]
}

func (n *sn) Child(i int) model.Leaf {
	assert.For(i < len(n.children), 20)
	return n.children[i]
}

func (n *sn) IndexOf(l model.Leaf) (ret int) {
	ret = -1
	for i := 0; i < len(n.children) && ret == -1; i++ {
		if l == n.children[i] {
			ret = i
		}
	}
	return
}

func (n *sn) NofChild() int {
	return len(n.children)
}

func (n *sn) Name() model.LeafName {
	return n.name
}

func (n *sn) init() {
	n.attr = make(map[model.AttrName]model.Attribute)
	n.children = make([]model.Leaf, 0)
}

type sm struct {
	root *sn
}

func (m *sm) NewReader(...model.Reader) model.Reader {
	return nil
}

func (m *sm) NewWriter(old ...model.Writer) model.Writer {
	w := &sw{base: m}
	if len(old) == 1 {
		w.InitFrom(old[0])
	}
	return w
}

func (m *sm) Root() model.Node {
	return m.root
}

func nf() func() model.Model {
	return func() model.Model {
		r := &sn{}
		r.init()
		return &sm{root: r}
	}
}

func init() {
	model.ModelFactory = nf()
}