--  part of OpenGLAda, (c) 2017 Felix Krause
--  released under the terms of the MIT license, see the file "COPYING"

with Glfw.API;

package body Glfw.Input.Joysticks is

   function Index (Source : Joystick) return Joystick_Index is
   begin
      return Enums.Joystick_ID'Pos (Source.Raw_Index) + 1;
   end Index;

   procedure Set_Index (Target : in out Joystick; Value : Joystick_Index) is
   begin
      Target.Raw_Index := Enums.Joystick_ID'Val (Value - 1);
   end Set_Index;

   function Present (Source : Joystick) return Boolean is
   begin
      return Boolean (API.Joystick_Present (Source.Raw_Index));
   end Present;

   function Positions (Source : Joystick) return Axis_Positions is
      Count : aliased Interfaces.C.int;
      Raw : constant API.Axis_Position_List_Pointers.Pointer
        := API.Get_Joystick_Axes (Source.Raw_Index, Count'Access);
   begin
      return API.Axis_Position_List_Pointers.Value
        (Raw, Interfaces.C.ptrdiff_t (Count));
   end Positions;

   function Button_States (Source : Joystick) return Joystick_Button_States is
      Count : aliased Interfaces.C.int;
      Raw : constant API.Joystick_Button_State_List_Pointers.Pointer
        := API.Get_Joystick_Buttons (Source.Raw_Index, Count'Access);
   begin
      return API.Joystick_Button_State_List_Pointers.Value
        (Raw, Interfaces.C.ptrdiff_t (Count));
   end Button_States;

end Glfw.Input.Joysticks;