#!/usr/bin/perl

use warnings;
use utf8;

##################################################

package Tetris::Figure;

sub new($$)
{
 	my $class=shift;
	my $shapes=shift;
	my $color=shift;
	my $self={ shapes=>$shapes, color=>$color };
	return bless $self, $class;
}

sub shape()
{
	return shift->{shapes}[0];
}

sub rotateLeft()
{
	my $self=shift;
	push @{$self->{shapes}}, shift @{$self->{shapes}};
}

sub rotateRight()
{
	my $self=shift;
	unshift @{$self->{shapes}}, pop @{$self->{shapes}};
}

sub width()
{
	return index(shift->shape.'|', '|');
}

sub height()
{
	return 1+shift->shape=~tr/|/|/;
}

sub getCell($$)
{
	my $self=shift;
	my ($j, $i)=@_;
	return 0 if $i<0 or $j<0 or $i>=$self->width or $j>=$self->height;
	return '■' eq substr((split /\|/, $self->shape)[$j], $i, 1);
}

##################################################

package Tetris::UI;
use Term::Slangy;

use constant { GLASS_X=>10, GLASS_Y=>9 };

sub init()
{
	utf8Mode(-1);
	initTT();
	initKeypad();
	cursorVisibility(0);

	colorPair(1, COLOR_GREEN, COLOR_BLACK);
	colorPair(2, COLOR_RED, COLOR_BLACK);
	colorPair(3, COLOR_GREEN, COLOR_BLACK);
	colorPair(4, COLOR_BLUE, COLOR_BLACK);
	colorPair(5, COLOR_CYAN, COLOR_BLACK);
	colorPair(6, COLOR_MAGENTA, COLOR_BLACK);
	colorPair(7, COLOR_BROWN, COLOR_BLACK);
	colorPair(8, COLOR_GRAY, COLOR_BLACK);
	colorPair(9, COLOR_BLACK, COLOR_BLACK);

	setColor(7);
	move(2, 2);
	writeString('ТЕТРИС');
	move(3, 2);
	writeString('© 2003—2010, Ф. Антонов, А. Швец');
}

sub term()
{
	clear;
	cursorVisibility(1);
	termTT;
}

sub showFigure($$$;$)
{
	my $fig=shift;
	my $x=shift;
	my $y=shift;
	setColor(shift // $fig->{color});
	for(my $j=0; $j<$fig->height; $j++)
	{
		for(my $i=0; $i<$fig->width; $i++)
		{
			if($fig->getCell($j, $i))
			{
				move(GLASS_Y+$y+$j, GLASS_X+$x+$i);
				writeChar(0x2588);	# █
			}
		}
	}
	refresh();
}

sub showNextFigure($)
{
	my $nextFigure=shift;
	setColor(3);
	move(GLASS_Y, GLASS_X+Tetris::Game->GLASS_COLS+4);
	writeString('Следующая:');
	for(my $j=0; $j<4; $j++)
	{
		move(GLASS_Y+2+$j, GLASS_X+Tetris::Game->GLASS_COLS+4);
		writeString('    ');
	}
	showFigure($nextFigure, Tetris::Game->GLASS_COLS+4, 2);
}

sub showScore($)
{
	setColor(3);
	move(GLASS_Y+7, GLASS_X+Tetris::Game->GLASS_COLS+4);
	writeString('Счёт: '.shift);
}

sub showGlass()
{
	setColor(1);
	hLine(GLASS_Y+Tetris::Game->GLASS_ROWS,
		GLASS_X-1, Tetris::Game->GLASS_COLS+2, 0x2591);	# ░
	vLine(GLASS_Y, GLASS_X-1, Tetris::Game->GLASS_ROWS, 0x2591);
	vLine(GLASS_Y, GLASS_X+Tetris::Game->GLASS_COLS,
		Tetris::Game->GLASS_ROWS, 0x2591);

	my $color;
	for(my $j=0; $j<Tetris::Game->GLASS_ROWS; $j++)
	{
		for(my $i=0; $i<Tetris::Game->GLASS_COLS; $i++)
		{
			$color=Tetris::Game::getGlassCell($j, $i);
			setColor($color);
			move(GLASS_Y+$j, GLASS_X+$i);
			writeChar($color==9? 0x20: 0x2588);	# █
			refresh();
		}
	}
	refresh();
}

sub play($)
{
	system "mplayer \"$_[0]\" >/dev/null 2>&1";
}

#########################################################

package Tetris::Game;

use Encode;
use open ':locale';
use open ':std';
use constant { GLASS_COLS=>10, GLASS_ROWS=>15 };
use constant
	{
		MOVE_RIGHT=>0,
		MOVE_UP=>1,
		MOVE_LEFT=>2,
		MOVE_DOWN=>3,
		ROTATE_LEFT=>4,
		ROTATE_RIGHT=>5
	};

##########

my @figures;
my @glass;
my $score;
my $nextFigure;
my $figure;
my $figureX;
my $figureY;

sub init
{
	Tetris::UI::init;
	$SIG{INT}=$SIG{__DIE__}=\&Tetris::UI::term;
	$score=0;
	@figures=(
		# T
		Tetris::Figure->new(['■■■|□■□', '■□|■■|■□', '□■□|■■■', '□■|■■|□■'], 2),
		# Q
		Tetris::Figure->new(['■■|■■'], 3),
		# I
		Tetris::Figure->new(['■|■|■|■', '■■■■'], 4),
		# Z
		Tetris::Figure->new(['■■□|□■■', '□■|■■|■□'], 5),
		# S
		Tetris::Figure->new(['□■■|■■□', '■□|■■|□■'], 6),
		# J
		Tetris::Figure->new(['□■|□■|■■', '■■■|□□■', '■■|■□|■□', '■□□|■■■'], 7),
		# L
		Tetris::Figure->new(['■□|■□|■■', '□□■|■■■', '■■|□■|□■', '■■■|■□□'], 0)
	);

	for(my $j=0; $j<GLASS_ROWS; $j++)
	{
		$glass[$j]=[(9) x GLASS_COLS];
	}
}

sub term
{
	Tetris::UI::play('timeout.wav');
	Tetris::UI::term;
	scores;
	print "Спасибо!\n";
	exit;
}

sub addFigure
{
	for(my $j=0; $j<$figure->height; $j++)
	{
		for(my $i=0; $i<$figure->width; $i++)
		{
			setGlassCell($figureY+$j, $figureX+$i, $figure->{color})
				if $figure->getCell($j, $i);
		}
	}
	@glass=(grep { grep {$_==9} @$_ } @glass);
	while(GLASS_ROWS>@glass)
	{
		Tetris::UI::play('wallend.wav');
		unshift @glass, [(9) x GLASS_COLS];
		$score++;
	}
	Tetris::UI::showGlass;
}

sub getGlassCell
{
	my ($j, $i)=@_;
	return undef if $j<0 or $i<0;
	return $glass[$j][$i];
}

sub setGlassCell
{
	my ($j, $i, $c)=@_;
	$glass[$j][$i]=$c;
}

sub canStay
{
	my $answer=0;
	for(my $j=0; $j<$figure->height; $j++)
	{
		for(my $i=0; $i<$figure->width; $i++)
		{
			my $color=getGlassCell($figureY+$j, $figureX+$i);
			$answer||=(defined $color
					and $color!=9
					and $figure->getCell($j, $i)
					or not defined $color);
			return 0 if $answer;
		}
	}
	return 1;
}

sub canMove
{
	my $dir=shift;
	move($dir);
	my $answer=canStay;
	move((MOVE_LEFT, MOVE_DOWN, MOVE_RIGHT, MOVE_UP,
			ROTATE_RIGHT, ROTATE_LEFT)[$dir]);
	return $answer;
}

sub showMove
{
	hide();
	move(shift);
	show();
}

sub show
{
	Tetris::UI::showFigure($figure, $figureX, $figureY);
}

sub hide
{
	Tetris::UI::showFigure($figure, $figureX, $figureY, 9);
}

sub move
{
	my $dir=shift;
	if($dir==MOVE_RIGHT)	{ $figureX++; }
	elsif($dir==MOVE_LEFT)	{ $figureX--; }
	elsif($dir==MOVE_DOWN)	{ $figureY++; }
	elsif($dir==MOVE_UP)	{ $figureY--; }
	elsif($dir==ROTATE_LEFT)	{ $figure->rotateLeft; }
	elsif($dir==ROTATE_RIGHT)	{ $figure->rotateRight; }
}

sub fall
{
	hide();
	move(MOVE_DOWN) while canMove(MOVE_DOWN);
	show();
}

sub game
{
	$nextFigure=$figures[int rand @figures];
	Tetris::UI::showGlass;

	while()
	{
		$figure=$nextFigure;
		$nextFigure=$figures[int rand @figures];

		Tetris::UI::showNextFigure($nextFigure);
		Tetris::UI::showScore($score);

		$figureX=int((GLASS_COLS-$figure->width)/2);
		$figureY=0;
		term unless canStay;
		while()
		{
			show;

			if(Tetris::UI::inputPending(5))
			{
				my $key=Tetris::UI::getKey();
				if($key==0x101) # UP
				{
					showMove(ROTATE_LEFT)
						if canMove(ROTATE_LEFT);
				}
				elsif($key==0x102) # DOWN
				{
					showMove(ROTATE_RIGHT)
						if canMove(ROTATE_RIGHT);
				}
				elsif($key==0x103) # LEFT
				{
					showMove(MOVE_LEFT)
						if canMove(MOVE_LEFT);
				}
				elsif($key==0x104) # RIGHT
				{
					showMove(MOVE_RIGHT)
						if canMove(MOVE_RIGHT);
				}
				elsif($key==0x20) # SPACE
				{
					fall;
				}
			}
			elsif(canMove(MOVE_DOWN))	{ showMove(MOVE_DOWN); }
			else
			{
				addFigure;
				last;
			}
		}
	}
}

sub scores
{
	return unless $score;
	open(my $scoresfd, '<', '/var/lib/games/ptetris.scores')
		or die 'Невозможно открыть файл с результатами: '
			.decode_utf8($!)."\n";
	my @scores=<$scoresfd>;
	close($scoresfd)
		or die 'Невозможно закрыть файл с результатами: '
			.decode_utf8($!)."\n";
	map { chomp; $_=[split /\t/, $_] } @scores;
	push @scores, [(getpwuid($<))[0], $score, ''.localtime];
	@scores=sort { $b->[1] <=> $a->[1] } @scores;
	pop @scores if @scores>10;
	open($scoresfd, '>', '/var/lib/games/ptetris.scores')
		or die 'Невозможно открыть файл с результатами: '
			.decode_utf8($!)."\n";
	print "TETRIS top ten:\n\n"; # FIXME
	for my $ss(@scores)
	{
		print $scoresfd ((join "\t", @$ss)."\n");
		print ((join "\t", @$ss)."\n");
	}
	print "\n";
	close($scoresfd)
		or die 'Невозможно закрыть файл с результатами: '
			.decode_utf8($!)."\n";
}

##########

init;
game;