Normalize briefing module options and weather stories

internal/weatherdata/bundle.go

@@ -4,6 +4,7 @@ package weatherdata
 import (
 	"encoding/json"
 	"math"
+	"strings"
 	"time"
 )
 
@@ -180,6 +181,15 @@ type WeatherStory struct {
 	DownloadURL string     `json:"downloadUrl,omitempty"`
 }
 
+// HasUsableContent reports whether the weather story contains displayable content or a valid period.
+func (s WeatherStory) HasUsableContent() bool {
+	return strings.TrimSpace(s.Title) != "" ||
+		strings.TrimSpace(s.Description) != "" ||
+		strings.TrimSpace(s.AltText) != "" ||
+		strings.TrimSpace(s.DownloadURL) != "" ||
+		(!s.StartTime.IsZero() && !s.EndTime.IsZero() && s.EndTime.After(s.StartTime))
+}
+
 type ConvectiveOutlookRun struct {
 	LocationID   string                        `json:"locationId,omitempty"`
 	LocationName string                        `json:"locationName,omitempty"`

internal/weatherdata/bundle_test.go

@@ -117,6 +117,31 @@ func TestForecastPeriodHasValidPrecipitationProbability(t *testing.T) {
 	}
 }
 
+func TestWeatherStoryHasUsableContent(t *testing.T) {
+	start := mustParseBundleTime("2026-05-29T13:00:00Z")
+	end := mustParseBundleTime("2026-05-29T14:00:00Z")
+	for _, tt := range []struct {
+		name  string
+		story WeatherStory
+		want  bool
+	}{
+		{name: "empty"},
+		{name: "whitespace title", story: WeatherStory{Title: " \t "}},
+		{name: "title", story: WeatherStory{Title: "Rain Chances"}, want: true},
+		{name: "description", story: WeatherStory{Description: "Showers expected."}, want: true},
+		{name: "alternate text", story: WeatherStory{AltText: "Rain chances graphic"}, want: true},
+		{name: "download URL", story: WeatherStory{DownloadURL: "https://example.invalid/story.png"}, want: true},
+		{name: "valid period", story: WeatherStory{StartTime: start, EndTime: end}, want: true},
+		{name: "reversed period", story: WeatherStory{StartTime: end, EndTime: start}},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.story.HasUsableContent(); got != tt.want {
+				t.Fatalf("HasUsableContent() = %t, want %t", got, tt.want)
+			}
+		})
+	}
+}
+
 func mustParseBundleTime(value string) time.Time {
 	parsed, err := time.Parse(time.RFC3339, value)
 	if err != nil {