-----------------------------------------------------------------------
--                              Ada Labs                             --
--                                                                   --
--                 Copyright (C) 2008-2023, AdaCore                  --
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-- This program is free software: you can redistribute it and/or     --
-- modify it under the terms of the GNU General Public License as    --
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--                                                                   --
-- This program is distributed in the hope that it will be useful,   --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of    --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the     --
-- GNU General Public License for more details.                      --
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-- You should have received a copy of the GNU General Public License --
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-----------------------------------------------------------------------

with Float_Maths; use Float_Maths;

package body Solar_System is

   --  implement a function to compute the X coordinate
   --  x of the reference + distance * cos(angle)
   function Compute_X
     (Body_To_Move : Body_T;
      Turns_Around : Body_T) return Float;

   --  implement a function to compute the Y coordinate
   --  y of the reference + distance * sin(angle)
   function Compute_Y
     (Body_To_Move : Body_T;
      Turns_Around : Body_T) return Float;

   function Compute_X
     (Body_To_Move : Body_T;
      Turns_Around : Body_T) return Float
   is
   begin
      return Turns_Around.X + Body_To_Move.Distance * Cos (Body_To_Move.Angle);
   end Compute_X;

   function Compute_Y
     (Body_To_Move : Body_T;
      Turns_Around : Body_T) return Float
   is
   begin
      return Turns_Around.Y + Body_To_Move.Distance * Sin (Body_To_Move.Angle);
   end Compute_Y;

   procedure Move (Body_To_Move : in out Body_T; Bodies : Bodies_Array_T) is
   begin

      Body_To_Move.X :=
        Compute_X (Body_To_Move, Bodies (Body_To_Move.Turns_Around));

      Body_To_Move.Y :=
        Compute_Y (Body_To_Move, Bodies (Body_To_Move.Turns_Around));

      Body_To_Move.Angle := Body_To_Move.Angle + Body_To_Move.Speed;

   end Move;

   procedure Move_All (Bodies : in out Bodies_Array_T) is
   begin

      --  loop over all bodies and call Move procedure
      for B of Bodies loop

         --  call the move procedure for each body
         Move (B, Bodies);
      end loop;

   end Move_All;

end Solar_System;
