Add Daily prompt input preflight

internal/promptinput/package_test.go

@@ -0,0 +1,94 @@
+package promptinput
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
+)
+
+func TestBuildDailyDataPackage(t *testing.T) {
+	briefingPackage := validBriefingPackage()
+
+	pkg, err := Build(briefingPackage)
+	if err != nil {
+		t.Fatalf("Build() error = %v", err)
+	}
+
+	if pkg.SchemaVersion != SchemaVersion {
+		t.Fatalf("SchemaVersion = %q, want %q", pkg.SchemaVersion, SchemaVersion)
+	}
+	if pkg.RunID != "20260529T100000Z_daily_today" {
+		t.Fatalf("RunID = %q, want briefing run id", pkg.RunID)
+	}
+	if pkg.Report.PromptID != "weather.daily_report" {
+		t.Fatalf("PromptID = %q, want weather.daily_report", pkg.Report.PromptID)
+	}
+	if pkg.Briefing.Daily == nil {
+		t.Fatal("Briefing.Daily = nil")
+	}
+	if pkg.RecentChanges.Items == nil || len(pkg.RecentChanges.Items) != 0 {
+		t.Fatalf("RecentChanges.Items = %#v, want empty slice", pkg.RecentChanges.Items)
+	}
+}
+
+func TestValidateRequiresFields(t *testing.T) {
+	pkg, err := Build(validBriefingPackage())
+	if err != nil {
+		t.Fatalf("Build() error = %v", err)
+	}
+	pkg.RunID = ""
+
+	err = Validate(pkg)
+	if err == nil {
+		t.Fatal("Validate() error = nil, want required field error")
+	}
+	if !strings.Contains(err.Error(), "runId") {
+		t.Fatalf("error = %q, want runId context", err.Error())
+	}
+}
+
+func TestMarshalDeterministic(t *testing.T) {
+	pkg, err := Build(validBriefingPackage())
+	if err != nil {
+		t.Fatalf("Build() error = %v", err)
+	}
+
+	first, err := json.MarshalIndent(pkg, "", "  ")
+	if err != nil {
+		t.Fatalf("first marshal: %v", err)
+	}
+	second, err := json.MarshalIndent(pkg, "", "  ")
+	if err != nil {
+		t.Fatalf("second marshal: %v", err)
+	}
+	if string(first) != string(second) {
+		t.Fatalf("JSON output changed between marshals:\n%s\n---\n%s", string(first), string(second))
+	}
+}
+
+func validBriefingPackage() briefing.Package {
+	generatedAt := time.Date(2026, 5, 29, 10, 0, 0, 0, time.UTC)
+	return briefing.Package{
+		Metadata: briefing.Metadata{
+			SchemaVersion: briefing.SchemaVersion,
+			RunID:         "20260529T100000Z_daily_today",
+			ReportID:      report.DailyToday,
+			PromptID:      "weather.daily_report",
+			GeneratedAt:   generatedAt,
+			Units:         "us",
+			Timezone:      "America/Chicago",
+			ValidPeriod: timeutil.Period{
+				Start: time.Date(2026, 5, 29, 5, 0, 0, 0, time.UTC),
+				End:   time.Date(2026, 5, 30, 5, 0, 0, 0, time.UTC),
+			},
+		},
+		Daily: &briefing.Daily{
+			ForecastSummaryDate: "2026-05-29",
+		},
+	}
+}