/* 
|\/|
|  |IKETRON

Authored by abakh <abakh@tuta.io>
No rights are reserved and this software comes with no warranties of any kind to the extent permitted by law.

compile with -lncurses
*/
#include <curses.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <signal.h>
#include <unistd.h>
#include <stdbool.h>
#include "config.h"
#define SAVE_TO_NUM 10
#define MINLEN 10
#define MAXLEN 24
#define MINWID 40
#define MAXWID 80
enum {UP=1,RIGHT,DOWN,LEFT,FLIGHT,NOTRAIL,BOMB,SPAWN,STOP,SUPERFOOD,TRAIL};
typedef signed char byte;

/* The Plan9 compiler can not handle VLAs and usleep is a POSIX function */
#ifdef NO_VLA 
#define len 10
#define wid 40

#ifdef Plan9
int usleep(long usec) {
    int second = usec/1000000;
    long nano = usec*1000 - second*1000000;
    struct timespec sleepy = {0};
    sleepy.tv_sec = second;
    sleepy.tv_nsec = nano;
    nanosleep(&sleepy, (struct timespec *) NULL);
    return 0;
}
#endif

#else
int len,wid;
#endif//NO_VLA

int py,px;
int immunity,flight,notrail;
byte direction;
long score;
chtype colors[6]={0};

byte pse_msg=100;
//no need to a epilepsy variable like in muncher as zeroing the colors suffices

FILE *scorefile;
char error[150]={0};

void move_tron(void){
	switch(direction){
		case UP:
			--py;
		break;
		case DOWN:
			++py;
		break;
		case LEFT:
			--px;
		break;
		case RIGHT:
			++px;
		break;
	}
	if(py==-1)
		py=len-1;
	else if(py==len)
		py=0;
	if(px==-1)
		px=wid-1;
	else if(py==len)
		py=0;
}
void logo(void){
	mvaddstr(1,0,"|\\/|");
	mvaddstr(2,0,"|  |IKETRON");
}
byte scorewrite(void){// only saves the top 10, returns the place in the chart
	bool deforno;
	if( !getenv("MT_SCORES") && (scorefile= fopen(MT_SCORES,"r")) ){
		deforno=1;
	}
	else{
		deforno=0;
		if( !(scorefile = fopen(getenv("MT_SCORES"),"r")) ){
			sprintf(error,"No accessible score files found. You can make an empty text file in %s or set MT_SCORES to such a file to solve this.",MT_SCORES);
			return -1;
		}
	}

	char namebuff[SAVE_TO_NUM][60];
	long scorebuff[SAVE_TO_NUM];

	memset(namebuff,0,SAVE_TO_NUM*60*sizeof(char) );
	memset(scorebuff,0,SAVE_TO_NUM*sizeof(long) );

	long fuckingscore=0;
	char fuckingname[60]={0};
	byte location=0;

	while( fscanf(scorefile,"%59s : %ld\n",fuckingname,&fuckingscore) == 2 && location<SAVE_TO_NUM ){
		strcpy(namebuff[location],fuckingname);
		scorebuff[location] = fuckingscore;
		++location;

		memset(fuckingname,0,60);
		fuckingscore=0;
	}
	if(deforno)
		scorefile = fopen(MT_SCORES,"w+");//get rid of the previous text first
	else
		scorefile = fopen(getenv("MT_SCORES"), "w+") ;
	if(!scorefile){
		strcpy(error, "The file cannot be opened in w+. ");
		return -1;
	}

	byte itreached=location;
	byte ret = -1;
	bool wroteit=0;

	for(location=0;location<=itreached && location<SAVE_TO_NUM-wroteit;++location){
		if(!wroteit && (location>=itreached || score>=scorebuff[location]) ){
			fprintf(scorefile,"%s : %ld\n",getenv("USER"),score);
			ret=location;
			wroteit=1;
		}
		if(location<SAVE_TO_NUM-wroteit && location<itreached)
			fprintf(scorefile,"%s : %ld\n",namebuff[location],scorebuff[location]);
	}
	fflush(scorefile);
	return ret;
}

void showscores(byte playerrank){
	erase();
	logo();
	if(*error){
		mvaddstr(3,0,error);
		printw("\nHowever, your score is %ld.",score);
		refresh();
		return;
	}
	if(playerrank == 0){
		char formername[60]={0};
		long formerscore=0;
		rewind(scorefile);
		fscanf(scorefile,"%*s : %*d\n");
		move(3,0);
		byte b=0;
		if ( fscanf(scorefile,"%s : %ld\n",formername,&formerscore)==2){
			halfdelay(1);
			printw("*****CONGRATULATIONS!****\n");
			printw("              You bet the\n");
			printw("                 previous\n");
			printw("                   record\n");
			printw("                       of\n");
			printw("           %14ld\n",formerscore);
			printw("                  held by\n");
			printw("              %11s\n",formername);
			printw("               \n");
			printw("               \n");
			printw("*************************\n");
			printw("Press a key to proceed:");
			Effect:
			move(4,0);
			attron(colors[b]);
			mvprintw(4,0, "     _____ ");
			mvprintw(5,0, "   .'     |");
			mvprintw(6,0, " .'       |");
			mvprintw(7,0, " |  .|    |");
			mvprintw(8,0, " |.' |    |");
			mvprintw(9,0, "     |    |");
			mvprintw(10,0,"  ___|    |___");
			mvprintw(11,0," |            |");
			mvprintw(12,0," |____________|");
			attroff(colors[b]);
			b=(b+1)%6;
			if(getch()==ERR)
				goto Effect;
			nocbreak();
			cbreak();
			erase();
			logo();
		}
	}
	//scorefile is still open with w+
	move(3,0);
	char pname[60] = {0};
	long pscore=0;
	byte rank=0;
	rewind(scorefile);
	printw(">*>*>Top %d<*<*<\n",SAVE_TO_NUM);
	while( rank<SAVE_TO_NUM && fscanf(scorefile,"%s : %ld\n",pname,&pscore) == 2){
		if(rank == playerrank)
			printw(">>>");
		printw("%d) %s : %ld\n",rank+1,pname,pscore);
		++rank;
	}
	addch('\n');
	refresh();
}
void put_stuff(byte board[len][wid],byte num){
	byte y,x;
	for(byte n=0;n<num;++n){
		do{
			y=rand()%len;
			x=rand()%wid;
		}while(y==py&&x==px);
		board[y][x]=STOP;
		if(!rand())
			board[y][x]=SUPERFOOD;
		else if(!(rand()%20))
			board[y][x]=SPAWN;
		else if(!(rand()%10))
			board[y][x]=BOMB;
		else if(!(rand()%10))
			board[y][x]=NOTRAIL;
		else if(!(rand()%4))
			board[y][x]=FLIGHT;
	}
}
void rectangle(void){
	for(int y=0;y<=len;++y){
		mvaddch(3+y,0,ACS_VLINE);
		mvaddch(4+y,1+wid,ACS_VLINE);
	}
	for(int x=0;x<=wid;++x){
		mvaddch(3,x,ACS_HLINE);
		mvaddch(4+len,x,ACS_HLINE);
	}
	mvaddch(3,0,ACS_ULCORNER);
	mvaddch(4+len,0,ACS_LLCORNER);
	mvaddch(3,1+wid,ACS_URCORNER);
	mvaddch(4+len,1+wid,ACS_LRCORNER);
}
void draw(byte board[len][wid]){
	int y,x;
	static byte effect=0;
	chtype prnt;
	rectangle();
	for(y=0;y<len;++y){
		for(x=0;x<wid;++x){
			if(board[y][x]<0){
				prnt=' '|A_STANDOUT|colors[abs(board[y][x])%6];
				board[y][x]++;
			}
			else if(y==py && x==px){
				prnt=ACS_PLUS;
				if(immunity)
					prnt|=colors[effect];
				else if(flight)
					prnt|=A_BOLD;
				else if(!notrail)
					prnt|=A_STANDOUT;
			}
			else if(board[y][x]==TRAIL)
				prnt=ACS_PLUS;
			else if(board[y][x]==NOTRAIL)
				prnt='&';
			else if(board[y][x]==FLIGHT)
				prnt='?';
			else if(board[y][x]==SUPERFOOD)
				prnt='%'|colors[effect];
			else if(board[y][x]==STOP)
				prnt='S';
			else if(board[y][x]==SPAWN)
				prnt='B';
			else if(board[y][x]==BOMB)
				prnt='8';
			else
				prnt= ' ';
			mvaddch(4+y,x+1,prnt);
		}
	}
	if(pse_msg>0){
		mvprintw(len+5,0,"Suffering PSE? Press e.");
		--pse_msg;
	}
	effect=(effect+1)%6;
}
void explode(byte board[len][wid],int by,int bx){
	board[by][bx]=0;//prevent endless recursion
	int sy=by-2;
	int sx=bx-4;
	int ey=by+2;
	int ex=bx+4;
	if(ey>=len)
		ey-=len;
	if(ex>=wid)
		ex-=wid;
	if(sy<0)
		sy+=len;
	if(sx<0)
		sx+=wid;
	int y=sy;
	int x=sx;
	while(y!=ey){
		while(x!=ex){
			++x;
			if(x==wid)
				x=0;
			if(board[y][x]==BOMB)
				explode(board,y,x);
			board[y][x]=-10;
		}
		x=sx;
		++y;
		if(y==len)
			y=0;
		
	}
}
void help(void){
	nocbreak();
	cbreak();
	erase();
	logo();
	attron(A_BOLD);
	mvprintw(3,0,"  **** THE CONTROLS ****");
	attroff(A_BOLD);
	mvprintw(4,0,"hjkl/ARROW KEYS : Change direction");
	mvprintw(5,0,"q : Quit");
	mvprintw(6,0,"F1 & F2: Help on controls & gameplay");
	mvprintw(8,0,"Press a key to continue");
	refresh();
	getch();
	erase();
	halfdelay(1);
}
void gameplay(void){
	nocbreak();
	cbreak();
	erase();
	logo();
	attron(A_BOLD);
	mvprintw(3,0,"     **** THE GAMEPLAY ****");
	attroff(A_BOLD);
	move(4,0);
	printw("You are controlling a strange vechile which can \n");
	printw("survive explosions but cannot cross the trail it has\n");
	printw("left behind. Keep it running as much as you can.");
	refresh();
	getch();
	erase();
	halfdelay(1);
}
void sigint_handler(int x){
	endwin();
	puts("Quit.");
	exit(x);
}
int main(int argc, char** argv){
#ifndef NO_VLA
	bool autoset=0;
	signal(SIGINT,sigint_handler);
	if(argc>3 || (argc==2 && !strcmp("help",argv[1])) ){
		printf("Usage: %s [len wid]\n",argv[0]);
		return EXIT_FAILURE;
	}
	if(argc==2){
		puts("Give both dimensions.");
		return EXIT_FAILURE;
	}
	if(argc==3){
		bool lool = sscanf(argv[1],"%d",&len) && sscanf(argv[2],"%d",&wid);
		if(!lool){
			puts("Invalid input.");
			return EXIT_FAILURE;
		}
		if(len<MINLEN || wid<MINWID || len>500 || wid>500){
			puts("At least one of your given dimensions is either too small or too big.");
			return EXIT_FAILURE;
		}
	
	}
	else{
		autoset=1;
	}
#endif
	initscr();
#ifndef NO_VLA 
	if(autoset){
		len=LINES-7;
		if(len<MINLEN)
			len=MINLEN;
		else if(len>MAXLEN)
			len=MAXLEN;

		wid=COLS-5;
		if(wid<MINWID)
			wid=MINWID;
		else if(wid>MAXWID)
			wid=MAXWID;
	}
#endif
	srand(time(NULL)%UINT_MAX);		
	byte board[len][wid];
	int prex,prey;
	bool halfspeed=0;
	const int constant=150*(80*24)/(len*wid);//that is added to score
	initscr();
	noecho();
	cbreak();
	keypad(stdscr,1);
	if(has_colors()){
		start_color();
		use_default_colors();

		init_pair(1,COLOR_BLUE,-1);
		init_pair(2,COLOR_GREEN,-1);
		init_pair(3,COLOR_YELLOW,-1);
		init_pair(4,COLOR_CYAN,-1);
		init_pair(5,COLOR_MAGENTA,-1);
		init_pair(6,COLOR_RED,-1);
		for(byte b= 0;b<6;++b){
			colors[b]=COLOR_PAIR(b+1);
		}

	}
	Start:
	immunity=flight=notrail=0;
	curs_set(0);
	halfdelay(1);
	score=0;
	direction=LEFT;
	py=len/2;
	px=wid/2;
	memset(board,0,len*wid);
	put_stuff(board,20);

	int preinput,input;
	while(1){
		erase();
		logo();
		mvprintw(1,12,"Score:%ld",score);
		if(immunity)
			mvprintw(2,12,"Immunity:%ld",immunity);
		else if(flight)
			mvprintw(2,12,"Flight:%ld",flight);
		else if(notrail)
			mvprintw(2,12,"NoTrail:%ld",notrail);
		draw(board);
		refresh();
	
		preinput=input;
		input = getch();
		if(input!=ERR)//hide message when a key is entered
			pse_msg=0;

		if(board[py][px]==SPAWN)
			put_stuff(board,5);
		else if(board[py][px]==BOMB){
			explode(board,py,px);
			for(byte b=0;b<10;++b){
				draw(board);
				refresh();
				usleep(100000);
			}
		}
		else if(board[py][px]==STOP){
			mvaddch(4+py,px+1,ACS_PLUS|A_STANDOUT);
			refresh();
			nocbreak();
			cbreak();
			preinput=input;
			input=getch();
			halfdelay(1);
		}	
		else if(board[py][px]==SUPERFOOD)
			immunity+=len+wid;
		else if(board[py][px]==FLIGHT)
			flight+=8;
		else if(board[py][px]==NOTRAIL)
			notrail+=15;	
		else
			goto NoFeatures;
		board[py][px]=0;//if one of conditions is true, it executes! keep nagging about goto being redundant!

		NoFeatures:
		if(board[py][px]==TRAIL){
			if(immunity)
				board[py][px]=0;
			else if(!flight)
				break;
		}
		if( input == KEY_F(1) || input=='?' )
			help();
		if( input == KEY_F(2) )
			gameplay();
		halfspeed=!halfspeed;
		if( (input=='k' || input==KEY_UP) ){
			direction=UP;
			halfspeed=1;
		}
		else if( (input=='j' || input==KEY_DOWN) ){
			direction=DOWN;
			halfspeed=1;
		}
		else if( (input=='h' || input==KEY_LEFT) )
			direction=LEFT;
		else if( (input=='l' || input==KEY_RIGHT) )
			direction=RIGHT;
		if( input=='q')
			sigint_handler(0);
		if(input=='e'){
			for(int b=0;b<6;++b){
				colors[b]=0;
			}
			pse_msg=0;
		}
		if(input!=ERR){
			if(preinput==input){//if it wasn't there, hitting two keys in less than 0.1 sec would not work
				usleep(100000);
				flushinp();
			}
		}
		
		if( !((direction==UP||direction==DOWN)&&!halfspeed) && !immunity && !flight && !notrail)
			board[py][px]=TRAIL;

		if(direction==UP && halfspeed){
			--py;
			if(py==-1)
				py=len-1;
			halfspeed=1;
		}
		else if(direction==DOWN && halfspeed){
			++py;
			if(py==len)
				py=0;
		}
		else if(direction==LEFT){
			--px;
			if(px==-1)
				px=wid-1;
		}
		else if(direction==RIGHT){
			++px;
			if(px==wid)
				px=0;
		}
		++score;
		if(!(score%100))
			put_stuff(board,5);
		if(immunity)
			--immunity;
		else if(flight)
			--flight;
		else if(notrail)
			--notrail;
	}
	nocbreak();
	cbreak();
	draw(board);
	refresh();
	mvprintw(len+5,0,"Game over! Press a key to see the high scores:");
	getch();
	showscores(scorewrite());
	printw("Game over! Wanna play again?(y/n)");
	curs_set(1);
	input=getch();
	if( input!= 'N' &&  input!= 'n' && input!='q')
		goto Start;
	endwin();
	return EXIT_SUCCESS;
}