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// Package tradlit fetches and parses the Traditional (1962 Missal) Latin
// propers from the missalemeum JSON API into the shared liturgy.Section
// type, so the rest of the app can treat the traditional and modern
// (niedziela.pl) lectionaries interchangeably.
package tradlit
import (
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/lukaszkasprzak/lectio/internal/liturgy"
)
// baseURL is the missalemeum proper-of-the-day API template ("%s" is lang,
// then date, YYYY-MM-DD). It is a package var so tests can point it at an
// httptest server.
var baseURL = "https://www.missalemeum.com/%s/api/v5/proper/%s"
// userAgent is sent on every fetch; matches the browser UA used elsewhere
// in this project (see the plan's Global Constraints).
const userAgent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 " +
"(KHTML, like Gecko) Chrome/124.0 Safari/537.36"
// citationRe matches the first *...* marker in a section's body text, e.g.
// "*Luke 7:36-50*" or "*Ps 44:2*".
var citationRe = regexp.MustCompile(`\*([^*\n]+)\*`)
// apiResponse mirrors the shape of the missalemeum proper-of-the-day API:
// a single-element list of { info, sections }.
type apiResponse struct {
Info struct {
Title string `json:"title"`
} `json:"info"`
Sections []apiSection `json:"sections"`
}
type apiSection struct {
ID string `json:"id"`
Label string `json:"label"`
Body [][]string `json:"body"`
}
// Parse decodes a missalemeum proper-of-the-day API response body into
// liturgy.Sections. Sections with an empty id or empty body are skipped.
func Parse(jsonBody []byte) ([]liturgy.Section, error) {
var resp []apiResponse
if err := json.Unmarshal(jsonBody, &resp); err != nil {
return nil, fmt.Errorf("tradlit: parse: %w", err)
}
if len(resp) == 0 {
return nil, fmt.Errorf("tradlit: parse: empty response")
}
var out []liturgy.Section
for _, sec := range resp[0].Sections {
if sec.ID == "" || len(sec.Body) == 0 || len(sec.Body[0]) == 0 {
continue
}
text := strings.Join(sec.Body[0], "\n")
var lines []string
for _, line := range strings.Split(text, "\n") {
line = strings.TrimSpace(line)
if line != "" {
lines = append(lines, line)
}
}
citation := ""
if m := citationRe.FindStringSubmatch(text); m != nil {
citation = strings.TrimSpace(m[1])
}
out = append(out, liturgy.Section{
Heading: sec.Label,
Citation: citation,
PartID: strings.ToLower(sec.ID),
Paragraphs: [][]string{lines},
})
}
return out, nil
}
// cachePath returns where Load caches a (date, lang) day's raw API response:
// <CacheDir>/<date>.trad.<lang>.json -- date-prefixed (like the modern
// lectionary's own cache files) so liturgy.CleanCache can prune it by date.
func cachePath(date, lang string) string {
return filepath.Join(liturgy.CacheDir(), date+".trad."+lang+".json")
}
// Load returns a day's traditional propers for lang, either read from the
// on-disk cache (offline) or fetched live from missalemeum and cached for
// next time (online). Both paths share Parse, so cached and live results
// are identical.
//
// - offline: reads the cache file written by a prior online Load (see
// cachePath); if it doesn't exist, returns a clear error telling the
// caller to go online or run 'lectio update' first.
// - online: fetches https://www.missalemeum.com/{lang}/api/v5/proper/{date}
// as before. On a successful 200, the raw response body is written to
// the cache path (best-effort -- a cache-write failure never fails the
// request) before being parsed. On HTTP 404 (no propers published for
// that date) it returns a clear error and writes nothing to the cache.
func Load(date, lang string, offline bool) ([]liturgy.Section, error) {
if offline {
return loadCached(date, lang)
}
return loadLive(date, lang)
}
// loadCached implements Load's offline path.
func loadCached(date, lang string) ([]liturgy.Section, error) {
body, err := os.ReadFile(cachePath(date, lang))
if err != nil {
return nil, fmt.Errorf("tradlit: no cached traditional propers for %s (%s); view it online or run 'lectio update' first", date, lang)
}
return Parse(body)
}
// loadLive implements Load's online path: fetch, best-effort cache the raw
// body, then parse.
func loadLive(date, lang string) ([]liturgy.Section, error) {
body, err := fetch(date, lang)
if err != nil {
return nil, err
}
writeCache(date, lang, body)
return Parse(body)
}
// fetch GETs the day's proper-of-the-day JSON from missalemeum and returns
// the raw response body. On HTTP 404 (no propers published for that date)
// it returns a clear error rather than the raw 404 body.
func fetch(date, lang string) ([]byte, error) {
url := fmt.Sprintf(baseURL, lang, date)
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, fmt.Errorf("tradlit: load: %w", err)
}
req.Header.Set("User-Agent", userAgent)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("tradlit: load %s: %w", date, err)
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNotFound {
return nil, fmt.Errorf("tradlit: no propers published for %s", date)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("tradlit: load %s: unexpected status %s", date, resp.Status)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("tradlit: load %s: %w", date, err)
}
return body, nil
}
// writeCache best-effort writes a day's raw API response body to its cache
// path; a failure to cache (e.g. an unwritable cache dir) must never fail
// the live request that produced body.
func writeCache(date, lang string, body []byte) {
path := cachePath(date, lang)
if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
return
}
_ = os.WriteFile(path, body, 0o644)
}
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