fix(go): merge gb32960 realtime snapshot payloads

go/vehicle-gateway/internal/realtime/snapshot_writer_test.go

@@ -3,6 +3,8 @@ package realtime
 import (
 	"context"
 	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
 	"errors"
 	"strings"
 	"testing"
@@ -199,6 +201,52 @@ func TestSnapshotWriterUpsertsRealtimeLocationWhenCoordinatesExist(t *testing.T)
 	}
 }
 
+func TestSnapshotWriterMergesGB32960ParsedJSONAcrossSplitRealtimeFrames(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	writer := NewSnapshotWriter(db)
+
+	existing := `{"data_units":[{"type":"0x01","name":"vehicle","value":{"soc_percent":88}}]}`
+	mock.ExpectQuery("SELECT parsed_json FROM vehicle_realtime_snapshot WHERE protocol = \\? AND vin = \\?").
+		WithArgs("GB32960", "VIN001").
+		WillReturnRows(sqlmock.NewRows([]string{"parsed_json"}).AddRow(existing))
+	mock.ExpectExec("INSERT INTO vehicle_realtime_snapshot").
+		WithArgs(
+			"GB32960",
+			"VIN001",
+			"",
+			"",
+			"",
+			jsonDataUnitsArg{types: []string{"0x01", "0x30"}},
+			sqlmock.AnyArg(),
+			sqlmock.AnyArg(),
+			sqlmock.AnyArg(),
+		).
+		WillReturnResult(sqlmock.NewResult(0, 1))
+
+	err = writer.Update(context.Background(), envelope.FrameEnvelope{
+		Protocol:     envelope.ProtocolGB32960,
+		MessageID:    "0x02",
+		VIN:          "VIN001",
+		EventTimeMS:  1782918600000,
+		ReceivedAtMS: 1782918601000,
+		Parsed: map[string]any{
+			"data_units": []any{
+				map[string]any{"type": "0x30", "name": "gd_fc_stack", "value": map[string]any{"stack_count": 1}},
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("Update() error = %v", err)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("sql expectations: %v", err)
+	}
+}
+
 func TestRealtimeUpsertsDoNotOverwriteWithOlderEventTime(t *testing.T) {
 	for _, tc := range []struct {
 		name  string
@@ -588,3 +636,38 @@ func (r *recordingPlateResolver) PlateByVIN(_ context.Context, vin string) (stri
 	r.vin = vin
 	return r.plate, r.err
 }
+
+type jsonDataUnitsArg struct {
+	types []string
+}
+
+func (a jsonDataUnitsArg) Match(value driver.Value) bool {
+	text, ok := value.(string)
+	if !ok {
+		return false
+	}
+	var parsed map[string]any
+	if err := json.Unmarshal([]byte(text), &parsed); err != nil {
+		return false
+	}
+	units, ok := parsed["data_units"].([]any)
+	if !ok {
+		return false
+	}
+	seen := map[string]bool{}
+	for _, unit := range units {
+		unitMap, ok := unit.(map[string]any)
+		if !ok {
+			continue
+		}
+		if unitType, ok := unitMap["type"].(string); ok {
+			seen[unitType] = true
+		}
+	}
+	for _, unitType := range a.types {
+		if !seen[unitType] {
+			return false
+		}
+	}
+	return true
+}