[Material] Check if max of MaterialIDs corresponds to number of porous media definitions.

MaterialLib/PorousMedium/CreatePorousMediaProperties.cpp

@@ -86,6 +86,28 @@ PorousMediaProperties createPorousMediaProperties(
         std::copy(mesh_material_ids->cbegin(), mesh_material_ids->cend(),
                   material_ids.begin());
     }
+    int const max_material_id =
+        *std::max_element(material_ids.cbegin(), material_ids.cend());
+
+    if (max_material_id > mat_ids.size() - 1)
+        OGS_FATAL(
+            "The maximum value of MaterialIDs in mesh is %d. As the "
+            "given number of porous media definitions in the project "
+            "file is %d, the maximum value of MaterialIDs in mesh must be %d "
+            "(index starts with zero).",
+            max_material_id, mat_ids.size(), max_material_id - 1);
+
+    if (max_material_id < mat_ids.size() - 1)
+        WARN(
+            "There are %d porous medium definitions in the project file but "
+            "only %d different values in the MaterialIDs vector/data_array in "
+            "the mesh.",
+            mat_ids.size(), max_material_id - 1);
+
+    if (mat_ids.back() != static_cast<int>(mat_ids.size()) - 1)
+        OGS_FATAL(
+            "The ids in the porous media definitions in the project file have "
+            "to be sequential, starting with the id zero.");
 
     return PorousMediaProperties{std::move(porosity_models),
                                  std::move(intrinsic_permeability_models),