started integrating

Author: RemDelaporteMathurin

src/App.jsx

@@ -564,7 +564,8 @@ const DnDFlow = () => {
         edges,
         solverParams,
         globalVariables,
-        events
+        events,
+        pythonCode
       };
 
       const response = await fetch(getApiEndpoint('/run-pathsim'), {

src/pathsim_utils.py

@@ -532,7 +532,8 @@ def make_pathsim_model(graph_data: dict) -> tuple[Simulation, float]:
     global_namespace = make_global_variables(global_vars)
 
     # Create a combined namespace that includes built-in functions and global variables
-    eval_namespace = {**globals(), **global_namespace}
+    eval_namespace = globals().copy()
+    eval_namespace.update(global_namespace)
 
     solver_prms, extra_params, duration = make_solver_params(
         solver_prms, eval_namespace
@@ -554,6 +555,18 @@ def make_pathsim_model(graph_data: dict) -> tuple[Simulation, float]:
     for node in nodes:
         var_name = make_var_name(node)
         eval_namespace[var_name] = find_block_by_id(node["id"], blocks)
+
+    # Execute python code
+    # NOTE Rem: we execute it after creating blocks so that user code can reference blocks by their var names
+    # ideally we would execute this just after `make_global_variables` so that global variables can be defined in the code editor
+    # but I couldn't get it to work, it must be a namespace issue
+    python_code = graph_data.get("pythonCode", "")
+    if python_code:
+        try:
+            exec(python_code, eval_namespace)
+        except Exception as e:
+            return jsonify({"error": f"Error executing Python code: {str(e)}"}), 400
+
     events += make_events(graph_data.get("events", []), eval_namespace)
 
     # Create the simulation