#18 - membership

includes/Services/Forms/RsvFormDefinitionValidator.php

@@ -34,6 +34,9 @@ final class RsvFormDefinitionValidator {
             $errors[] = 'Form must contain a submit button.';
         }
 
+        // Validate membership bindings if present.
+        $errors = array_merge($errors, $this->validate_membership_bindings($definition));
+
         return $errors;
     }
 
@@ -109,4 +112,41 @@ final class RsvFormDefinitionValidator {
         global $rsv_template_registry;
         return new RsvTemplateEngine(registry: $rsv_template_registry);
     }
+
+    /**
+     * @param array<string,mixed> $definition
+     * @return list<string>
+     */
+    private function validate_membership_bindings(array $definition): array {
+        $errors = [];
+        $membership = $definition['membership'] ?? [];
+
+        if (!is_array($membership)) {
+            return $errors;
+        }
+
+        $bindings = $membership['bindings'] ?? [];
+        if (!is_array($bindings)) {
+            return $errors;
+        }
+
+        foreach ($bindings as $idx => $binding) {
+            if (!is_array($binding)) {
+                continue;
+            }
+
+            $program_id = intval($binding['program_id'] ?? 0);
+            $discount = floatval($binding['discount'] ?? 0.0);
+
+            if ($program_id <= 0) {
+                $errors[] = "Membership binding {$idx}: program_id must be a positive integer.";
+            }
+
+            if ($discount < 0.0 || $discount > 100.0) {
+                $errors[] = "Membership binding {$idx}: discount must be between 0 and 100.";
+            }
+        }
+
+        return $errors;
+    }
 }