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package at
import (
"encoding/json"
"fmt"
"log/slog"
"maps"
"math"
"net/http"
"net/url"
"slices"
"strconv"
"strings"
"sync"
"time"
"push-f.com/lex-surf/internal/lex"
"push-f.com/lex-surf/lex-fetch/progress"
)
type Fetcher struct{}
const concurrentRequests = 4
func (s *Fetcher) Fetch(log *slog.Logger, client *http.Client, progress *progress.Reporter) ([]lex.Law, error) {
// The API is documented in https://data.bka.gv.at/ris/ogd/v2.6/Documents/Dokumentation_OGD-RIS_API.pdf.
// Consolidated laws can only be queried via the Bundesrecht endpoint which returns individual paragraphs.
// Since we'll get multiple results for each law, we're saving results into a hash map.
lawsMap := make(map[string]lex.Law)
// TODO: also query laws from the past and future
date := time.Now().Format("2006-01-02")
data, err := fetchPage(client, date, 1)
if err != nil {
return nil, fmt.Errorf("failed to fetch first page: %w", err)
}
totalResults, _ := strconv.Atoi(data.Hits.Text)
if totalResults == 0 {
return nil, fmt.Errorf("API returned 0 results")
}
totalPages := int(math.Ceil(float64(totalResults) / 100))
progress.Total = totalPages
assign(lawsMap, data.OgdDocumentReference)
semaphore := make(chan struct{}, concurrentRequests)
var wg sync.WaitGroup
var mu sync.Mutex
var retErr error
var retErrPage int
var errOnce sync.Once
for page := 2; page <= totalPages; page++ {
if retErr != nil {
return nil, fmt.Errorf("failed to fetch page %d: %w", retErrPage, retErr)
}
wg.Add(1)
semaphore <- struct{}{}
go func(p int) {
defer wg.Done()
defer func() { <-semaphore }()
data, err := fetchPage(client, date, page)
progress.ReportProgress(page)
if err != nil {
errOnce.Do(func() {
retErr = err
retErrPage = p
})
}
mu.Lock()
assign(lawsMap, data.OgdDocumentReference)
mu.Unlock()
}(page)
}
laws := slices.SortedFunc(maps.Values(lawsMap), func(a, b lex.Law) int {
if a.Title > b.Title {
return 1
} else if a.Title < b.Title {
return -1
}
return 0
})
return laws, nil
}
func fetchPage(client *http.Client, date string, page int) (*ogdDocumentResults, error) {
req, err := http.NewRequest("GET", "https://data.bka.gv.at/ris/api/v2.6/Bundesrecht", nil)
if err != nil {
return nil, fmt.Errorf("build request: %w", err)
}
req.URL.RawQuery = url.Values{
"Appl": {"BrKons"}, // Bundesrecht konsolidiert
"Typ": {"BG oder BVG"}, // Bundesgesetz or Bundesverfassungsgesetz
"DokumenteProSeite": {"OneHundred"},
"Seitennummer": {strconv.Itoa(page)},
"FassungVom": {date},
}.Encode()
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("send request: %w", err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("unexpected status code %d", resp.StatusCode)
}
var data brKonsResult
err = json.NewDecoder(resp.Body).Decode(&data)
if err != nil {
return nil, fmt.Errorf("JSON decode: %w", err)
}
result := data.OgdSearchResult
if result.Error != nil {
return nil, fmt.Errorf("error response: %s", result.Error)
}
return result.OgdDocumentResults, nil
}
func assign(laws map[string]lex.Law, paraDocs []document) {
for _, paraDoc := range paraDocs {
para := paraDoc.Data.Metadaten.Bundesrecht
law := lex.Law{
Title: para.Kurztitel,
URL: para.BrKons.GesamteRechtsvorschriftUrl,
}
if para.BrKons.Abkuerzung != nil {
law.Abbr = *para.BrKons.Abkuerzung
redir := strings.ToLower(*para.BrKons.Abkuerzung)
redir = strings.ReplaceAll(redir, ")", "")
redir = strings.ReplaceAll(redir, "(", "")
redir = strings.ReplaceAll(redir, " – ", "-")
redir = strings.ReplaceAll(redir, " ", "-")
redir = strings.ReplaceAll(redir, "\u00A0", "-")
redir = strings.ReplaceAll(redir, "ä", "ae")
redir = strings.ReplaceAll(redir, "ü", "ue")
redir = strings.ReplaceAll(redir, "ö", "oe")
redir = strings.ReplaceAll(redir, "ß", "ss")
law.Redir = redir
}
laws[para.BrKons.Gesetzesnummer] = law
}
}
type brKonsResult struct {
OgdSearchResult struct {
Error *struct {
Applikation string
Message string
}
OgdDocumentResults *ogdDocumentResults
}
}
type ogdDocumentResults struct {
Hits struct {
Text string `json:"#text"`
}
OgdDocumentReference []document
}
type document struct {
Data struct {
Metadaten struct {
Bundesrecht struct {
Kurztitel string
BrKons struct {
GesamteRechtsvorschriftUrl string
Abkuerzung *string
Gesetzesnummer string
}
}
}
}
}
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