package reichelt

import (
	"strconv"
	"strings"

	"github.com/andybalholm/cascadia"

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

type Meta map[string]map[string]string

var (
	metaSelector          = cascadia.MustCompile(".av_propview")
	metaItemNameSelector  = cascadia.MustCompile(".av_propname")
	metaItemValueSelector = cascadia.MustCompile(".av_propvalue")
)

// Get Metadata connected to specified part
func (c *Connection) GetMeta(p Part) (Meta, error) {
	resp, err := c.client.Get("https://www.reichelt.de/index.html?ACTION=3&ARTICLE=" + strconv.Itoa(p.Number))

	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	doc, err := html.Parse(resp.Body)

	if err != nil {
		return nil, err
	}

	nodes := metaSelector.MatchAll(doc)
	if nodes == nil {
		return nil, nil
	}

	result := make(Meta)

	for _, n := range nodes {
		if n.FirstChild == nil || n.FirstChild.FirstChild == nil {
			continue
		}

		headline := n.FirstChild.FirstChild.Data
		data := make(map[string]string)

		names := metaItemNameSelector.MatchAll(n)
		values := metaItemValueSelector.MatchAll(n)

		if len(names) != len(values) {
			continue
		}

		for i := range names {
			if names[i].FirstChild == nil || values[i].FirstChild == nil {
				continue
			}

			data[names[i].FirstChild.Data] = strings.Trim(values[i].FirstChild.Data, " ")
		}

		result[headline] = data
	}

	return result, nil
}