--------------------------------------------------------------------------------
--                                                                            --
-- Copyright (C) 2004, RISC OS Ada Library (RASCAL) developers.               --
--                                                                            --
-- This library is free software; you can redistribute it and/or              --
-- modify it under the terms of the GNU Lesser General Public                 --
-- License as published by the Free Software Foundation; either               --
-- version 2.1 of the License, or (at your option) any later version.         --
--                                                                            --
-- This library 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           --
-- Lesser General Public License for more details.                            --
--                                                                            --
-- You should have received a copy of the GNU Lesser General Public           --
-- License along with this library; if not, write to the Free Software        --
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA    --
--                                                                            --
--------------------------------------------------------------------------------

-- $Author$
-- $Date$
-- $Revision$

with RASCAL.OS;
with RASCAL.Memory;  use RASCAL.Memory;

with Kernel;         use Kernel;
with Interfaces.C;   use Interfaces.C;


package body RASCAL.ToolboxDCS is

   -- SWIs
   Toolbox_ObjectMiscOp : constant :=16#44EC6#;

   DCS_ClassSWI         : constant := 16#82A80#;
   DCS_PostFilter       : constant := 16#82A81#;
   DCS_PreFilter        : constant := 16#82A82#;

   -- Reason codes
   DCS_GetWindowId      : constant := 16#0#;
   DCS_SetMessage       : constant := 16#1#;
   DCS_GetMessage       : constant := 16#2#;
   DCS_SetTitle         : constant := 16#3#;
   DCS_GetTitle         : constant := 16#4#;

   --

   function Get_Window_ID (DCS   : in Object_ID;
                           Flags : in System.Unsigned_Types.Unsigned := 0) return Object_ID is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(DCS);
      Register.R(2) := DCS_GetWindowId;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxDCS.Get_Window_ID: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      return Object_ID(Register.R(0));
   end Get_Window_ID;

   --

   procedure Set_Message (DCS       : in Object_ID;
                          Message   : in string;
                          Flags     : in System.Unsigned_Types.Unsigned := 0) is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
      Message_0            : string := Message & ASCII.NUL;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(DCS);
      Register.R(2) := DCS_SetMessage;
      Register.R(3) := Adr_To_Int(Message_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxDCS.Set_Message: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Message;

   --

   function Get_Message (DCS   : in Object_ID;
                         Flags : in System.Unsigned_Types.Unsigned := 0) return string is

      Register    : aliased Kernel.swi_regs;
      Error       : oserror_access;
      Buffer_Size : integer;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(DCS);
      Register.R(2) := DCS_GetMessage;
      Register.R(3) := 0;
      Register.R(4) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxDCS.Get_Message(I): " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      Buffer_Size := integer(Register.R(4));
      declare
         Buffer : string(1..Buffer_Size);
      begin
         Register.R(0) := int(Unsigned_to_Int(Flags));
         Register.R(1) := int(DCS);
         Register.R(2) := DCS_GetMessage;
         Register.R(3) := Adr_To_Int(Buffer'Address);
         Register.R(4) := int(Buffer_Size);
         Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

         if Error /= null then
            pragma Debug(Report("ToolboxDCS.Get_Message(II): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_Message;

   --

   procedure Set_Title (DCS   : in Object_ID;
                        Titel : in string;
                        Flags : in System.Unsigned_Types.Unsigned := 0) is

      Register    : aliased Kernel.swi_regs;
      Error       : oserror_access;
      Title_0     : string := Titel & ASCII.NUL;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(DCS);
      Register.R(2) := DCS_SetTitle;
      Register.R(3) := Adr_To_Int(Title_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxDCS.Set_Title: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Title;

   --

   function Get_Title (DCS   : in Object_ID;
                       Flags : in System.Unsigned_Types.Unsigned := 0) return string is

      Register    : aliased Kernel.swi_regs;
      Error       : oserror_access;
      Buffer_Size : integer;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(DCS);
      Register.R(2) := DCS_GetTitle;
      Register.R(3) := 0;
      Register.R(4) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxDCS.Get_Title(I): " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      Buffer_Size := integer(Register.R(4));
      declare
         Buffer : string(1..Buffer_Size);
      begin
         Register.R(0) := int(Unsigned_to_Int(Flags));
         Register.R(1) := int(DCS);
         Register.R(2) := DCS_GetTitle;
         Register.R(3) := Adr_To_Int(Buffer'Address);
         Register.R(4) := int(Buffer_Size);
         Error := Kernel.swi(Toolbox_ObjectMiscOp,register'Access,register'Access);

         if Error /= null then
            pragma Debug(Report("ToolboxDCS.Get_Title(II): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_Title;

end RASCAL.ToolboxDCS;
