/*
 *	aegis - project change supervisor
 *	Copyright (C) 2001 Peter Miller;
 *	All rights reserved.
 *
 *	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 2 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, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate delta2times
 */

#include <change/branch.h>
#include <error.h> /* for assert */
#include <project.h>


static time_t change_completion_timestamp _((change_ty *));

static time_t
change_completion_timestamp(cp)
	change_ty	*cp;
{
	cstate		cstate_data;
	cstate_history	chp;
	cstate_history_list chlp;

	cstate_data = change_cstate_get(cp);
	assert(cstate_data->state == cstate_state_completed);
	chlp = cstate_data->history;
	assert(chlp);
	assert(chlp->length);
	chp = chlp->list[chlp->length - 1];
	assert(chp);
	return chp->when;
}


time_t
change_history_delta_to_timestamp(pp, delta_number)
	project_ty	*pp;
	long		delta_number;
{
	cstate		cstate_data;
	cstate_branch_history_list hl;
	size_t		j;
	change_ty	*cp;

	cp = project_change_get(pp);
	cstate_data = change_cstate_get(cp);
	if (!cstate_data->branch)
		return (time_t)-1;
	if (delta_number == 0)
	{
		/*
		 * special case, meaning
		 * ``when the branch was created''
		 */
		if (cstate_data->history && cstate_data->history->length)
			return cstate_data->history->list[0]->when;
		return (time_t)-1;
	}
	hl = cstate_data->branch->history;
	if (!hl)
		return (time_t)-1;
	for (j = 0; j < hl->length; ++j)
	{
		cstate_branch_history bh;
		change_ty	*cp2;
		time_t		result;

		bh = hl->list[j];
		assert(bh);
		if (!bh)
			continue;
		if (bh->delta_number != delta_number)
			continue;
		cp2 = change_alloc(pp, bh->change_number);
		change_bind_existing(cp2);
		result = change_completion_timestamp(cp2);
		change_free(cp2);
		return result;
	}
	return (time_t)-1;
}