chore: add more field types (#1141)

Adds a number of new field types and capabilities to existing fields.

A massive change with far too many moving pieces to document in a single commit.

packages/lib/advanced-fields-validation/validate-radio.ts

@@ -0,0 +1,41 @@
+interface RadioFieldMeta {
+  readOnly?: boolean;
+  required?: boolean;
+  values?: { checked: boolean; value: string }[];
+}
+
+export const validateRadioField = (
+  value: string | undefined,
+  fieldMeta: RadioFieldMeta,
+  isSigningPage: boolean = false,
+): string[] => {
+  const errors = [];
+
+  const { readOnly, required, values } = fieldMeta;
+
+  if (readOnly && required) {
+    errors.push('A field cannot be both read-only and required');
+  }
+
+  if (readOnly && (!values || values.length === 0)) {
+    errors.push('A read-only field must have at least one value');
+  }
+
+  if (isSigningPage && required && !value) {
+    errors.push('Choosing an option is required');
+  }
+
+  if (values) {
+    const checkedRadioFieldValues = values.filter((option) => option.checked);
+
+    if (values.length === 0) {
+      errors.push('Radio field must have at least one option');
+    }
+
+    if (checkedRadioFieldValues.length > 1) {
+      errors.push('There cannot be more than one checked option');
+    }
+  }
+
+  return errors;
+};