//
//	aegis - project change supervisor
//	Copyright (C) 2004-2008 Peter Miller
//
//	This program is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 3 of the License, or
//	(at your option) any later version.
//
//	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.
//
//	You should have received a copy of the GNU General Public License
//	along with this program. If not, see
//	<http://www.gnu.org/licenses/>.
//

#include <common/error.h> // for assert
#include <common/symtab.h>
#include <libaegis/change/file.h>


fstate_src_ty *
change_file_find_uuid(change::pointer cp, string_ty *uuid,
    view_path_ty view_path)
{
    //
    // See if we can do a fast lookup first.
    //
    assert(uuid);
    assert(cp);
    if (view_path == view_path_first)
    {
        //
        // Make sure fstate has been read in and the symbol tables used
        // to speed up lookups have been initialised.
        //
        change_fstate_get(cp);
        assert(cp->fstate_uuid_stp);
        if (cp->fstate_uuid_stp)
        {
            fstate_src_ty *src =
                (fstate_src_ty *)symtab_query(cp->fstate_uuid_stp, uuid);
            if (src)
            {
                assert(src->action != file_action_remove || !src->move);
            }
            return src;
        }
    }

    //
    // Do it the slow way.
    //
    // FIXME: why not keep and index for each view path type?
    //
    for (size_t j = 0; ; ++j)
    {
	fstate_src_ty   *src;

	src = change_file_nth(cp, j, view_path);
	if (!src)
	    return 0;
	if (src->uuid && str_equal(uuid, src->uuid))
	{
            //
            // When a file is renamed, it appears in the change's file
            // list twice: once for the remove and again for the create.
            // Both entires have the same UUID.  Most of the time the
            // user is expecting the create side (with the new name) not
            // the remove side.
	    //
	    if (src->action != file_action_remove || !src->move)
		return src;
	}
    }
}