/*
 * Netris -- A free networked version of T*tris
 * Copyright (C) 1994-1996,1999  Mark H. Weaver <mhw@netris.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: shapes.c,v 1.16 1999/05/16 06:56:31 mhw Exp $
 */

#include "netris.h"
#include <stdlib.h>

#define ShapeName(name, dir) \
	shape_ ## name ## _ ## dir

#define PreDecl(name, dir) \
	static Shape ShapeName(name, dir)

#define StdShape(name, cmdName, mirror, type, realDir, dir, nextDir) \
	static Shape ShapeName(name, dir) = { &ShapeName(name, nextDir), \
		0, 0, mirror, D_ ## realDir, type, cmds_ ## cmdName }

#define FourWayDecl(name, cmdName, mirror, type) \
	PreDecl(name, down); \
	StdShape(name, cmdName, mirror, type, left, left, down); \
	StdShape(name, cmdName, mirror, type, up, up, left); \
	StdShape(name, cmdName, mirror, type, right, right, up); \
	StdShape(name, cmdName, mirror, type, down, down, right)

#define TwoWayDecl(name, cmdName, mirror, type) \
	PreDecl(name, vert); \
	StdShape(name, cmdName, mirror, type, right, horiz, vert); \
	StdShape(name, cmdName, mirror, type, down, vert, horiz)

static Cmd cmds_long[] = { C_back, C_plot, C_forw, C_plot, C_forw, C_plot,
	C_forw, C_plot, C_end };
TwoWayDecl(long, long, 0, BT_blue);

static Cmd cmds_square[] = { C_plot, C_forw, C_left, C_plot, C_forw, C_left,
	C_plot, C_forw, C_left, C_plot, C_end };
static Shape shape_square = { &shape_square, 0, 0, D_up, 0, BT_magenta,
	cmds_square };

static Cmd cmds_l[] = { C_right, C_back, C_plot, C_forw, C_plot, C_forw,
	C_plot, C_left, C_forw, C_plot, C_end };
FourWayDecl(l, l, 0, BT_cyan);
FourWayDecl(l1, l, 1, BT_yellow);

static Cmd cmds_t[] = { C_plot, C_forw, C_plot, C_back, C_right, C_forw,
	C_plot, C_back, C_back, C_plot, C_end };
FourWayDecl(t, t, 0, BT_white);

static Cmd cmds_s[] = { C_back, C_plot, C_forw, C_plot, C_left, C_forw,
	C_plot, C_right, C_forw, C_plot, C_end };
TwoWayDecl(s, s, 0, BT_green);
TwoWayDecl(s1, s, 1, BT_red);

ShapeOption stdOptions[] = {
	{1, &shape_long_horiz},
	{1, &shape_square},
	{1, &shape_l_down},
	{1, &shape_l1_down},
	{1, &shape_t_down},
	{1, &shape_s_horiz},
	{1, &shape_s1_horiz},
	{0, NULL}};

Shape *netMapping[] = {
	&shape_long_horiz,
	&shape_long_vert,
	&shape_square,
	&shape_l_down,
	&shape_l_right,
	&shape_l_up,
	&shape_l_left,
	&shape_l1_down,
	&shape_l1_right,
	&shape_l1_up,
	&shape_l1_left,
	&shape_t_down,
	&shape_t_right,
	&shape_t_up,
	&shape_t_left,
	&shape_s_horiz,
	&shape_s_vert,
	&shape_s1_horiz,
	&shape_s1_vert,
	NULL};

ExtFunc void MoveInDir(Dir dir, int dist, int *y, int *x)
{
	switch (dir) {
		case D_down:	*y -= dist; break;
		case D_right:	*x += dist; break;
		case D_up:		*y += dist; break;
		case D_left:	*x -= dist; break;
		default:
			assert(0);
	}
}

ExtFunc Dir RotateDir(Dir dir, int delta)
{
	return 3 & (dir + delta);
}

ExtFunc int ShapeIterate(Shape *s, int scr, int y, int x, int falling,
ExtFunc				ShapeDrawFunc func, void *data)
{
	int i, mirror, result;
	Dir dir;
	BlockType type;

	y += s->initY;
	x += s->initX;
	dir = s->initDir;
	type = falling ? -s->type : s->type;
	mirror = s->mirrored ? -1 : 1;
	for (i = 0; s->cmds[i] != C_end; ++i)
		switch (s->cmds[i]) {
			case C_forw:
				MoveInDir(dir, 1, &y, &x);
				break;
			case C_back:
				MoveInDir(dir, -1, &y, &x);
				break;
			case C_left:
				dir = RotateDir(dir, mirror);
				break;
			case C_right:
				dir = RotateDir(dir, -mirror);
				break;
			case C_plot:
				if ((result = func(scr, y, x, type, data)))
					return result;
				break;
			default:
				assert(0);
		}
	return 0;
}

ExtFunc Shape *ChooseOption(ShapeOption *options)
{
	int i;
	float total = 0, val;

	for (i = 0; options[i].shape; ++i)
		total += options[i].weight;
	val = Random(0, 32767) / 32768.0 * total;
	for (i = 0; options[i].shape; ++i) {
		val -= options[i].weight;
		if (val < 0)
			return options[i].shape;
	}
	return options[0].shape;
}

ExtFunc short ShapeToNetNum(Shape *shape)
{
	int num;

	for (num = 0; netMapping[num]; ++num)
		if (netMapping[num] == shape)
			return num;
	assert(0);
	return 0;
}

ExtFunc Shape *NetNumToShape(short num)
{
	assert(num >= 0 && num < sizeof(netMapping) / sizeof(netMapping[0]) - 1);
	return netMapping[num];
}

/*
 * vi: ts=4 ai
 * vim: noai si
 */