mobile: return the day's rank and its localised label

2 files changed, 56 insertions, 9 deletions

diff --git a/mobile/mobile.go b/mobile/mobile.go
index c2c6347..6312ee0 100644
--- a/mobile/mobile.go
+++ b/mobile/mobile.go
@@ -16,6 +16,7 @@ import (
 	"strings"
 
 	"github.com/lukaszkasprzak/lectio/internal/config"
+	"github.com/lukaszkasprzak/lectio/internal/i18n"
 	"github.com/lukaszkasprzak/lectio/internal/readings"
 	"github.com/lukaszkasprzak/lectio/internal/render"
 )
@@ -31,15 +32,17 @@ type reading struct {
 
 // dayDoc is the JSON returned by Day.
 type dayDoc struct {
-	Date     string    `json:"date"`
-	Form     string    `json:"form"`
-	Lang     string    `json:"lang"`
-	Version  string    `json:"version"`
-	Name     string    `json:"name"`
-	Season   string    `json:"season"`
-	Colour   string    `json:"colour"`
-	Readings []reading `json:"readings"`
-	Error    string    `json:"error,omitempty"`
+	Date      string    `json:"date"`
+	Form      string    `json:"form"`
+	Lang      string    `json:"lang"`
+	Version   string    `json:"version"`
+	Name      string    `json:"name"`
+	Season    string    `json:"season"`
+	Colour    string    `json:"colour"`
+	Rank      string    `json:"rank"`
+	RankLabel string    `json:"rank_label"`
+	Readings  []reading `json:"readings"`
+	Error     string    `json:"error,omitempty"`
 }
 
 // lectByForm maps the app's form code to lectio's lectionary value.
@@ -69,6 +72,8 @@ func Day(date, form, version, lang string) string {
 		out.Name = info.Name
 		out.Season = info.Season
 		out.Colour = info.Colour
+		out.Rank = info.Rank
+		out.RankLabel = i18n.Get(lang).Rank[info.Rank]
 	} else {
 		out.Error = err.Error()
 	}
diff --git a/mobile/mobile_test.go b/mobile/mobile_test.go
new file mode 100644
index 0000000..c7df63c
--- /dev/null
+++ b/mobile/mobile_test.go
@@ -0,0 +1,42 @@
+package mobile
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func decodeDay(t *testing.T, s string) map[string]any {
+	t.Helper()
+	var m map[string]any
+	if err := json.Unmarshal([]byte(s), &m); err != nil {
+		t.Fatalf("Day returned invalid JSON: %v\n%s", err, s)
+	}
+	return m
+}
+
+func TestDayCarriesLocalisedRank(t *testing.T) {
+	pl := decodeDay(t, Day("2026-08-01", "of", "vul", "pl"))
+	if pl["rank"] != "memorial" {
+		t.Errorf("pl rank = %v, want memorial", pl["rank"])
+	}
+	if pl["rank_label"] != "wspomnienie obowiązkowe" {
+		t.Errorf("pl rank_label = %v", pl["rank_label"])
+	}
+	en := decodeDay(t, Day("2026-08-01", "of", "vul", "en"))
+	if en["rank_label"] != "memorial" {
+		t.Errorf("en rank_label = %v", en["rank_label"])
+	}
+}
+
+// The app shows the colour as a swatch and never as a word, so the raw key must
+// be present and no localised label may be. This test exists so the app cannot
+// quietly start depending on a colour word.
+func TestDayHasColourKeyButNoColourLabel(t *testing.T) {
+	m := decodeDay(t, Day("2026-08-01", "of", "vul", "pl"))
+	if m["colour"] != "white" {
+		t.Errorf("colour = %v, want white", m["colour"])
+	}
+	if _, present := m["colour_label"]; present {
+		t.Error("colour_label must not be returned: the app draws a swatch")
+	}
+}