------------------------------------------------------------------------------
--                                                                          --
--                             tiled-code-gen                               --
--                                                                          --
--                    Copyright (C) 2018 Fabien Chouteau                    --
--                                                                          --
--                                                                          --
--  Redistribution and use in source and binary forms, with or without      --
--  modification, are permitted provided that the following conditions are  --
--  met:                                                                    --
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------------------------------------------------------------------------------

--  This package handles the collision shapes of tiles
--
--  The shapes are loaded from the tileset file in the Collisions objects and
--  users can then test if a given point is within one of the shapes.

with DOM.Core;

private with GNATCOLL.Geometry;
private with Ada.Containers.Doubly_Linked_Lists;

package TCG.Collision_Objects is

   type Collisions is limited private;

   procedure Load (This : in out Collisions;
                   N    : DOM.Core.Node);

   function Has_Collision (This : Collisions)
                           return Boolean;
   --  Return true if there is at least one collision shape

   function Collide (This : Collisions;
                     X, Y : Float)
                     return Boolean;
   --  Return True if this coordinate is in one of the collision shapes

private

   package Geometry is new GNATCOLL.Geometry (Float);
   use Geometry;

   type Shape_Kind is (Rectangle_Shape, Ellipse_Shape, Polygon_Shape);

   type Collision_Shape (Kind : Shape_Kind := Rectangle_Shape) is record
      case Kind is
         when Rectangle_Shape | Ellipse_Shape =>
            Rect : Polygon (1 .. 4);
         when Polygon_Shape =>
            Poly : not null access Polygon;
      end case;
   end record;

   package Shape_List_Pck is new Ada.Containers.Doubly_Linked_Lists
     (Collision_Shape);

   type Collisions is limited record
      List : Shape_List_Pck.List;
   end record;

end TCG.Collision_Objects;