//
//	aegis - project change supervisor
//	Copyright (C) 1999, 2002-2008 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 <libaegis/change.h>
#include <common/error.h> // for assert
#include <libaegis/file.h>
#include <common/now.h>
#include <libaegis/os.h>
#include <libaegis/project/file.h>
#include <libaegis/undo.h>
#include <libaegis/user.h>


static bool
source_file_whiteout(change::pointer cp)
{
    pconf_ty *pconf_data = change_pconf_get(cp, 0);
    work_area_style_ty *s = pconf_data->development_directory_style;
    assert(s);
    return (s && s->source_file_whiteout);
}


void
change_file_whiteout_write(change::pointer cp, string_ty *filename,
    user_ty::pointer up)
{
    string_ty       *dd;
    string_ty       *s2;

    dd = change_development_directory_get(cp, 0);

    //
    // Remove any existing file (this cleans up junk, and
    // breaks the link if we are using symlink trees).
    //
    s2 = os_path_join(dd, filename);
    up->become_begin();
    if (os_exists(s2))
	os_unlink(s2);
    up->become_end();

    //
    // The whiteout is controlled by the development_directory_style's
    // source_file_whiteout field, except if overridden by the command line.
    //
    int whiteout_default = source_file_whiteout(cp);
    if (up->whiteout(whiteout_default))
    {
	string_ty	*content;

	content = change_file_whiteout(cp, filename);
	if (content)
	{
	    int             umask;
	    int             mode;
	    fstate_src_ty   *p_src_data;

	    //
	    // create a junk file in the change
	    //
	    umask = ~change_umask(cp);
	    up->become_begin();
	    os_mkdir_between(dd, filename, 02755);
	    undo_unlink_errok(s2);
	    mode = 0644 & ~umask;
	    file_from_string(s2, content, mode);
	    str_free(content);
	    up->become_end();

	    //
	    // update the mod-time to match the project
	    // (if exists in project)
	    //
	    p_src_data = project_file_find(cp->pp, filename, view_path_extreme);
	    if (p_src_data)
	    {
		string_ty	*s3;
		time_t		mtime_old;
		time_t		mtime_young;
		time_t		when;

		//
		// Make sure the whiteout file is
		// younger than the baseline file.
		// This ensures that a build (which
		// will fail) is triggered if the file
		// is still being referred to.
		//
		when = now();
		s3 = project_file_path(cp->pp, filename);
		assert(s3);
		user_ty::become scoped(up);
		os_mtime_range(s3, &mtime_old, &mtime_young);
		str_free(s3);
		if (when <= mtime_old)
		    when = mtime_old + 60;
		if (when <= mtime_young)
		    when = mtime_young + 60;
		os_mtime_set_errok(s2, when);
	    }
	}
    }
    str_free(s2);
}