Implemented basic car support, and restructured few tests and other errors; errors when rng gets called TODO fix

src/simulator.zig

@@ -6,8 +6,10 @@ const st = @import("common/structures.zig");
 const ut = @import("common/utils.zig");
 const Road = @import("infrastructure/road.zig").Road;
 const Node = @import("infrastructure/node.zig").Node;
+const Car = @import("vehicles/car.zig").Car;
 const NodeManager = @import("infrastructure/node_manager.zig").NodeManager;
 const RoadManager = @import("infrastructure/road_manager.zig").RoadManager;
+const CarManager = @import("vehicles/car_manager.zig").CarManager;
 
 pub const Simulator = struct {
     /// allocator for convenience
@@ -16,6 +18,8 @@ pub const Simulator = struct {
     node_man: NodeManager,
     /// 'class' tracking all the roads (and appropriate functions)
     road_man: RoadManager,
+    /// 'class' tracking all the cars (and appropriate functions)
+    car_man: CarManager,
     // vars
     /// Tracks whether next road will start building from the node the last road was built at
     auto_continue: bool,
@@ -31,24 +35,30 @@ pub const Simulator = struct {
     show_connections: bool,
     /// Toggle that tracks whether ID (or possibly something more in the future) of every entity is displayed in GUI
     display_entity_info: bool,
+    /// Entity (car/road/node) that is highlighed (hovered over by a mouse)
     highlighted_entity: ?st.Entity,
+    /// Interface for RNG
+    random: std.Random,
 
     /// Constructor for convenience
-    pub fn init(new_allocator: std.mem.Allocator) Simulator {
+    pub fn init(new_allocator: std.mem.Allocator, rand_impl: std.Random.IoSource) Simulator {
         return .{
             .allocator = new_allocator,
             .node_man = .init(),
             .road_man = .init(),
+            .car_man = .init(),
             .auto_continue = false,
             .delete_mode = false,
             .show_connections = false,
             .display_entity_info = false,
             .highlighted_entity = null,
+            .random = rand_impl.interface(),
         };
     }
 
     /// Deinitialisation of node and road objects
     pub fn deinit(self: *Simulator) !void {
+        self.car_man.deinit(self.allocator);
         self.road_man.deinit(self.allocator);
         try self.node_man.deinit(self.allocator);
     }
@@ -66,6 +76,7 @@ pub const Simulator = struct {
 
         self.road_man.draw(highlighted_road, self.display_entity_info);
         self.node_man.draw(pos, self.display_entity_info);
+        self.car_man.draw();
 
         self.drawRelatedSelectedEntities();
     }
@@ -92,6 +103,7 @@ pub const Simulator = struct {
                 road.nodes[0].draw(c.NODE_RELATED_COLOUR, self.display_entity_info);
                 road.nodes[1].draw(c.NODE_RELATED_COLOUR, self.display_entity_info);
             },
+            // TODO car
         }
     }
 
@@ -112,8 +124,8 @@ pub const Simulator = struct {
         self.delete_mode = rl.isKeyDown(.left_shift);
         self.show_connections = rl.isKeyDown(.left_alt) and !self.delete_mode;
 
+        if (rl.isKeyReleased(.n)) self.createCar();
         if (rl.isKeyReleased(.tab)) self.display_entity_info = !self.display_entity_info;
-
         if (rl.isKeyReleased(.c)) self.clear() catch |err| {
             std.debug.panic("Failed to clear the entities: {}\n", .{err});
         };
@@ -132,16 +144,16 @@ pub const Simulator = struct {
     /// Function that handles functionality that executes upon left click
     fn leftClickEvent(self: *Simulator, pos: rl.Vector2) void {
         if (self.delete_mode and self.highlighted_entity != null and self.highlighted_entity.? == .road) {
-            self.delete_road() catch |err| {
+            self.deleteRoad() catch |err| {
                 std.debug.panic("Failed to delete the road: {}\n", .{err});
             };
             return;
         }
-        self.new_road(pos);
+        self.createRoad(pos);
     }
 
     /// User initiated road building functionality
-    fn new_road(self: *Simulator, pos: rl.Vector2) void {
+    fn createRoad(self: *Simulator, pos: rl.Vector2) void {
         if (self.show_connections) return;
         const cur_node = self.node_man.getSelectedNode(self.allocator, pos) catch |err| {
             std.debug.panic("Failed to append the newly created node at pos ({d}, {d}) to node list: {}\n", .{
@@ -167,7 +179,7 @@ pub const Simulator = struct {
     }
 
     /// User initiated road destroying functionality
-    fn delete_road(self: *Simulator) !void {
+    fn deleteRoad(self: *Simulator) !void {
         // We can trust this because this only gets called if valid and if type is road
         std.debug.assert(self.highlighted_entity != null and self.highlighted_entity.? == .road);
         const h_road = self.highlighted_entity.?.road;
@@ -380,4 +392,17 @@ pub const Simulator = struct {
             std.debug.panic("Failed to create a road of final intersection and end origin node: {}\n", .{err});
         };
     }
+
+    /// Creates a car and calls
+    fn createCar(self: *Simulator) void {
+        const nodes_len = self.node_man.nodes.items.len;
+        if (nodes_len == 0) return;
+        // Grab random node
+        const i = self.random.uintLessThan(usize, nodes_len);
+
+        const ref_node = self.node_man.nodes.items[i];
+        self.car_man.addCar(self.allocator, ref_node) catch |err| {
+            std.debug.panic("Unable to create a car or append it to the list of cars: {}\n", .{err});
+        };
+    }
 };