Splitting function completed

src/infrastructure/road.zig

@@ -1,6 +1,7 @@
 const rl = @import("raylib");
 
 const c = @import("../common/constants.zig");
+const e = @import("../errors.zig");
 const st = @import("../common/structures.zig");
 const ut = @import("../common/utils.zig");
 const Node = @import("node.zig").Node;
@@ -79,6 +80,18 @@ pub const Road = struct {
     pub fn collides(self: *const Road, pos: rl.Vector2) bool {
         return rl.checkCollisionPointLine(pos, self.nodes[0].pos, self.nodes[1].pos, c.ROAD_SIZE);
     }
+
+    /// Updates node reference old_node => new node; returns error if old_node does not exist
+    pub fn updateNodeReference(self: *Road, old_node: *Node, new_node: *Node) !void {
+        for (0..self.nodes.len) |i| {
+            if (self.nodes[i] != old_node) continue;
+
+            self.nodes[i] = new_node;
+            return;
+        }
+
+        return e.Entity.NotFound;
+    }
 };
 
 const std = @import("std");
@@ -109,4 +122,7 @@ test "valid road nodes" {
 
     try expect(road.nodes[0].id == 34);
     try expect(road.nodes[1].id == 227);
-}
+}
+
+// TODO tests
+// test every case error for every function that can return an error