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package de
import (
"fmt"
"log/slog"
"net/http"
"net/url"
"strings"
"github.com/antchfx/htmlquery"
"golang.org/x/text/encoding/charmap"
"golang.org/x/text/transform"
"push-f.com/lex-surf/internal/lex"
"push-f.com/lex-surf/lex-fetch/progress"
)
type Fetcher struct{}
var pages = []rune("ABCDEFGHIJKLMNOPQRSTUVWYZ123456789")
func (s *Fetcher) Fetch(log *slog.Logger, client *http.Client, progress *progress.Reporter) ([]lex.Law, error) {
progress.Total = len(pages)
var laws []lex.Law
for i := range len(pages) {
resp, err := client.Get(fmt.Sprintf("https://www.gesetze-im-internet.de/Teilliste_%c.html", pages[i]))
if err != nil {
return nil, fmt.Errorf("failed to fetch page: %w", err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("unexpected status code %d", resp.StatusCode)
}
reader := transform.NewReader(resp.Body, charmap.ISO8859_1.NewDecoder())
doc, err := htmlquery.Parse(reader)
if err != nil {
return nil, fmt.Errorf("failed to HTML parse: %w", err)
}
div := htmlquery.FindOne(doc, "//div[@id='paddingLR12']")
if div == nil {
return nil, fmt.Errorf("didn't find expected HTML div")
}
for child := range div.ChildNodes() {
if child.FirstChild != nil {
href := htmlquery.SelectAttr(child.FirstChild, "href")
redir, ok := strings.CutPrefix(href, "./")
if !ok {
return nil, fmt.Errorf("expected href to start with ./ but found %s", href)
}
redir, ok = strings.CutSuffix(redir, "/index.html")
if !ok {
return nil, fmt.Errorf("expected href to end with /index.html but found %s", href)
}
hrefUrl, _ := url.Parse(href)
laws = append(laws, lex.Law{
URL: resp.Request.URL.ResolveReference(hrefUrl).String(),
Title: strings.TrimSpace(child.FirstChild.NextSibling.NextSibling.Data),
Redir: redir,
Abbr: redir,
})
}
}
progress.ReportProgress(i + 1)
}
return laws, nil
}
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