--  Copyright (C) Simon Wright <simon@pushface.org>

--  This package is free software; you can redistribute it and/or
--  modify it under terms of the GNU General Public License as
--  published by the Free Software Foundation; either version 2, or
--  (at your option) any later version. This package 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. You should have received a copy of the GNU General Public
--  License distributed with this package; see file COPYING.  If not,
--  write to the Free Software Foundation, 59 Temple Place - Suite
--  330, Boston, MA 02111-1307, USA.

with Ada.Containers;
with Van_Fleet.A2;
with Van_Fleet.Customer;
with Van_Fleet.Hired_Van.Inheritance;
with Van_Fleet.Pool_Van.All_Instances;
with Van_Fleet.Pool_Van.Inheritance;

separate (Van_Fleet.Van)
function Lend
  (To : not null ColdFrame.Instances.Handle;
   Terminating_At : ColdFrame.Project.Calendar.Time)
  return Handle is

   PVC : constant Pool_Van.Vectors.Vector := Pool_Van.All_Instances;
   PVH : Pool_Van.Handle;
   VH : Handle;
   HVH : Hired_Van.Handle;
   use type Ada.Containers.Count_Type;

begin

   if PVC.Length = 0 then
      raise Not_Found;
   end if;

   PVH := PVC.First_Element;
   VH := Pool_Van.Inheritance.Find_Van_Parent (PVH);

   Pool_Van.Delete (PVH);

   HVH := Hired_Van.Inheritance.Create_Tree (ColdFrame.Instances.Handle (VH));
   Hired_Van.Set_Expected_Termination (HVH, To => Terminating_At);

   A2.Link (Is_On_Loan_To => Customer.Handle (To),
            Is_Borrowing => HVH);

   return VH;

end Lend;
