fix: a linked parameter remains linked after deleting target module

refs #329
refs nghyd#571

src/session.ts

@@ -86,6 +86,7 @@ import { PreBarrageParams } from "./prebarrage/pre_barrage_params";
 import { PbCloison } from "./prebarrage/pb_cloison";
 import { PbBassin } from "./prebarrage/pb_bassin";
 import { PbBassinParams } from "./prebarrage/pb_bassin_params";
+import { ParamValueMode } from "./param/param-value-mode";
 
 export class Session {
 
@@ -198,6 +199,7 @@ export class Session {
         for (const n of this._nubs) {
             if (n.uid === sn.uid) {
                 this._nubs.splice(i, 1);
+                this.fixDanglingLinks();
                 return;
             }
             i++;
@@ -205,6 +207,22 @@ export class Session {
         throw new Error(`Session.deleteNub() : le Nub (uid ${sn.uid}) à supprimer n'a pas été trouvé`);
     }
 
+    /**
+     * set parameters linked to non exsting modules to fixed mode
+     */
+    private fixDanglingLinks() {
+        for (const n of this._nubs) {
+            for (const p of n.parameterIterator) {
+                if (p.valueMode === ParamValueMode.LINK) {
+                    const targetId = p.referencedValue.nub.uid;
+                    if (this.findNubByUid(targetId) === undefined) {
+                        p.valueMode = ParamValueMode.SINGLE;
+                    }
+                }
+            }
+        }
+    }
+
     /**
      * Returns a JSON representation of (a part of) the current session
      * @param options an object having Nub uids as keys, with extra data object as values;