fix: template with empty advanced fields (#1339)

Templates can be created and sent with advanced fields that have empty
values. That will cause an error when the user tries to sign the
document.

For example, you can create a template with a checkbox field and save
it. Then, you can click the "Use template" button and send the document
by clicking "Send document." However, this shouldn't be possible if the
advanced field doesn't have any values.

packages/ui/primitives/template-flow/add-template-fields.tsx

@@ -157,6 +157,38 @@ export const AddTemplateFieldsFormPartial = ({
     selectedSignerIndex === -1 ? 0 : selectedSignerIndex,
   );
 
+  const filterFieldsWithEmptyValues = (fields: typeof localFields, fieldType: string) =>
+    fields
+      .filter((field) => field.type === fieldType)
+      .filter((field) => {
+        if (field.fieldMeta && 'values' in field.fieldMeta) {
+          return field.fieldMeta.values?.length === 0;
+        }
+
+        return true;
+      });
+
+  const emptyCheckboxFields = useMemo(
+    () => filterFieldsWithEmptyValues(localFields, FieldType.CHECKBOX),
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [localFields],
+  );
+
+  const emptyRadioFields = useMemo(
+    () => filterFieldsWithEmptyValues(localFields, FieldType.RADIO),
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [localFields],
+  );
+
+  const emptySelectFields = useMemo(
+    () => filterFieldsWithEmptyValues(localFields, FieldType.DROPDOWN),
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [localFields],
+  );
+
+  const hasErrors =
+    emptyCheckboxFields.length > 0 || emptyRadioFields.length > 0 || emptySelectFields.length > 0;
+
   const [isFieldWithinBounds, setIsFieldWithinBounds] = useState(false);
   const [coords, setCoords] = useState({
     x: 0,
@@ -789,6 +821,24 @@ export const AddTemplateFieldsFormPartial = ({
             </div>
           </DocumentFlowFormContainerContent>
 
+          {hasErrors && (
+            <div className="mt-4">
+              <ul>
+                <li className="text-sm text-red-500">
+                  <Trans>
+                    To proceed further, please set at least one value for the{' '}
+                    {emptyCheckboxFields.length > 0
+                      ? 'Checkbox'
+                      : emptyRadioFields.length > 0
+                      ? 'Radio'
+                      : 'Select'}{' '}
+                    field.
+                  </Trans>
+                </li>
+              </ul>
+            </div>
+          )}
+
           <DocumentFlowFormContainerFooter>
             <DocumentFlowFormContainerStep step={currentStep} maxStep={totalSteps} />
 
@@ -796,6 +846,7 @@ export const AddTemplateFieldsFormPartial = ({
               loading={isSubmitting}
               disabled={isSubmitting}
               goNextLabel={msg`Save Template`}
+              disableNextStep={hasErrors}
               onGoBackClick={() => {
                 previousStep();
                 remove();