/* Skippy - Seduces Kids Into Perversion
 *
 * Copyright (C) 2004 Hyriand <hyriand@thegraveyard.org>
 *
 * 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  02111-1307  USA
 */

#include "skippy.h"

void
layout_run(MainWin *mw, dlist *windows, unsigned int *total_width, unsigned int *total_height)
{
	int sum_w = 0, max_h = 0, max_w = 0, max_row_w = 0;
	int row_y = 0, y = 0, x = 0, row_h = 0;
	
	dlist *iter, *slots = 0, *slot_iter, *rows;
	
	rows = dlist_add(0, 0);
	
	windows = dlist_first(windows);
	*total_width = *total_height = 0;
	
	for(iter = windows; iter; iter = iter->next)
	{
		ClientWin *cw = (ClientWin *)iter->data;
		sum_w += cw->client.width;
		max_w = MAX(max_w, cw->client.width);
		max_h = MAX(max_h, cw->client.height);
	}
	
	for(iter = windows; iter; iter = iter->next)
	{
		ClientWin *cw = (ClientWin*)iter->data;
		dlist *slot_iter = dlist_first(slots);
		for(; slot_iter; slot_iter = slot_iter->next)
		{
			dlist *slot = (dlist *)slot_iter->data;
			int slot_h = -DISTANCE(mw);
			REDUCE(slot_h = slot_h + ((ClientWin*)iter->data)->client.height + DISTANCE(mw), slot);
			if(slot_h + DISTANCE(mw) + cw->client.height < max_h)
			{
				slot_iter->data = dlist_add(slot, cw);
				break;
			}
		}
		if(! slot_iter)
			slots = dlist_add(slots, dlist_add(0, cw));
	}
	
	max_row_w = sqrt(sum_w * max_h);
	for(slot_iter = dlist_first(slots); slot_iter; slot_iter = slot_iter->next)
	{
		dlist *slot = (dlist *)slot_iter->data;
		int slot_w = 0;
		REDUCE(slot_w = MAX(slot_w, ((ClientWin*)iter->data)->client.width), slot);
		y = row_y;
		for(iter = dlist_first(slot); iter; iter = iter->next)
		{
			ClientWin *cw = (ClientWin *)iter->data;
			cw->x = x + (slot_w - cw->client.width) / 2;
			cw->y = y;
			y += cw->client.height + DISTANCE(mw);
			rows->data = dlist_add((dlist *)rows->data, cw);
		}
		row_h = MAX(row_h, y - row_y);
		*total_height = MAX(*total_height, y);
		x += slot_w + DISTANCE(mw);
		*total_width = MAX(*total_width, x);
		if(x > max_row_w)
		{
			x = 0;
			row_y += row_h;
			row_h = 0;
			rows = dlist_add(rows, 0);
		}
		dlist_free(slot);
	}
	dlist_free(slots);
	
	*total_width -= DISTANCE(mw);
	*total_height -= DISTANCE(mw);
	
	for(iter = dlist_first(rows); iter; iter = iter->next)
	{
		dlist *row = (dlist *)iter->data;
		int row_w = 0, xoff;
		REDUCE(row_w = MAX(row_w, ((ClientWin*)iter->data)->x + ((ClientWin*)iter->data)->client.width), row);
		xoff = (*total_width - row_w) / 2;
		REDUCE(((ClientWin*)iter->data)->x += xoff, row);
		dlist_free(row);
	}
	
	dlist_free(rows);
}