//go:build ignore
package scraper

import (
	"errors"
	"slices"
	"strings"

	"golang.org/x/net/html"
	"golang.org/x/net/html/atom"
)

var body = &html.Node{
	Type:     html.ElementNode,
	Data:     "body",
	DataAtom: atom.Body,
}

var ErrNotAnElementNode = errors.New("not a html.ElementNode")

func ParseFragment(s string) (*html.Node, error) {
	n, err := html.ParseFragment(strings.NewReader(s), body)
	if err != nil {
		return nil, err
	}
	return n[0], nil
}

func MatchElemAttr(s string, n *html.Node) (bool, error) {
	n1, err := parseFragment(s)
	if err != nil {
		return false, err
	}

	if n1.Type != html.ElementNode {
		return false, errors.Join(
			ErrNotAnElementNode,
			errors.New("s isn's a html.ElementNode"),
		)
	}
	if n.Type != html.ElementNode {
		return false, errors.Join(
			ErrNotAnElementNode,
			errors.New("n isn's a html.ElementNode"),
		)
	}

	if n1.Data == n.Data &&
		slices.Equal(n1.Attr, n.Attr) {
		return true, nil
	}
	return false, nil
}

func SearchElemAttr2(s string, n2 *html.Node) (chan *html.Node, error) {
	ch := make(chan *html.Node)
	var crawl func(*html.Node)
	crawl = func(n *html.Node) {
		matches, err := MatchElemAttr(s, n)
		if err != nil {
			panic(err)
		}
		if matches {
			ch <- n
		}
		c := n.FirstChild
		for c != nil {
			crawl(c)
			c = c.NextSibling
		}
	}
	go func() {
		defer close(ch)
		crawl(n2)
	}()

	if r := recover(); r != nil {
		return nil, r.(error)
	}
	return ch, nil
}