/*
*
* This is `gramscii`, a simple tool to create ascii box graphs
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>

#define MOVE   0x00
#define BOX    0x01
#define ARROW  0x02
#define TEXT   0x04


#define DIR_R  0x01
#define DIR_U  0x02
#define DIR_D  0x04
#define DIR_L  0x08


#define WIDTH  100
#define HEIGHT  25

#define BG        ' '
#define PTR       '+'
#define UND       '_'
#define LINE_H    '-'
#define LINE_V    '|'
#define DBLINE_H  '='
#define DBLINE_V  'u'
#define BLDLINE   '#'
#define ARR_L     '<'
#define ARR_R     '>'
#define ARR_U     '^'
#define ARR_D     'v'


#define MIN(x,y)  (x) < (y) ? (x) : (y)
#define MAX(x,y)  (x) > (y) ? (x) : (y)

char screen[HEIGHT][WIDTH+1];

int state;
int dir;
int x;
int y;
int step;
char cursor;
char corner;
char box_line_h;
char box_line_v;
char arrow_line_h;
char arrow_line_v;

struct termios t1, t2;


void cleanup(int s){

	printf("\033[;H\033[2J");
	tcsetattr(0, TCSANOW, &t1);
	exit(0);
}

void show_cursor(){
	printf("\033[%d;%df", y+1, x+1);
	//putchar(screen[y][x]);
	//printf("\033[%d;%df", y+1, x+2);
}

void set(char c){
	screen[y][x] = c;
}

void set_xy(int x, int y, char c){
	/* FIXME: check if x and y are valid!!!! */
	screen[y][x] = c;
}

void draw_xy(int x, int y, char c){
	/* FIXME: check if x and y are valid!!!! */
	printf("\033[%d;%df",y+1,x+1);
	putchar(c);	
}

void clear(){
	screen[y][x] = BG;
}

void init_screen(){
	int i;
	for(i=0; i<HEIGHT; i++){
		memset(screen[i], ' ', WIDTH);
		screen[i][WIDTH]='\0';
	}
	cursor = PTR;
	corner = PTR;
	box_line_h = LINE_H;
	box_line_v = LINE_V;
	arrow_line_h = LINE_H;	
	arrow_line_v = LINE_V;	
}

char* state_str(){
	switch(state){
		case MOVE:
			return "mv ";
		case TEXT:
			return "txt";
		case BOX:
			return "box";
		case ARROW:
			return "arr";
	}
}


void status_bar(){
	
	printf("\033[%d;1f\033[7m", HEIGHT+1);
	printf(" x: %d y: %d -- mode: %s", x, y, state_str());
	printf("\033[0m");
}

int redraw(){
	int i;
	
	printf("\033[2J\033[1;1H");
	for (i=0;i<HEIGHT;i++){
		fprintf(stdout,"%s\n",screen[i]);
	}
	status_bar();
	show_cursor();
	step = 1;
}

void update_current(){
	printf("\033[%d'%df",y+1,x+1);
	putchar(screen[y][x]);
}


void init(){

	signal(SIGHUP, cleanup);
	signal(SIGINT, cleanup);
	signal(SIGTERM, cleanup);
	signal(SIGQUIT, cleanup);
	
	tcgetattr(0, &t1);
	t2 = t1;
	t2.c_lflag &= ~(ICANON | ECHO);
	tcsetattr(0, TCSANOW, &t2);
	
	init_screen();
	x = WIDTH/2;
	y = HEIGHT/2;
	redraw();
}

void check_bound(){
	if (x<0) x=0;
	else if (x>=WIDTH) x = WIDTH-1;
	if (y<0) y=0;
	else if (y>=HEIGHT) y = HEIGHT -1; 
}


void get_text(){
	char c;
	int orig_x = x, orig_y = y;
	
	//cursor = UND;
	redraw();
	while((c=getchar())!=EOF && c != 27){
		if(c=='\n'){
			set(BG);
			y += 1;
			x = orig_x;
		}
		else {
			set(c);
			update_current();
			x += 1;
			if (x >= WIDTH)
				x = orig_x;
		}
		check_bound();
		status_bar();
		show_cursor();
	}
	cursor = PTR;
	state=MOVE;
}


void fix_box(int x1, int y1){

	int xmin, ymin, xmax, ymax;
	int i;
	
	xmin = MIN(x, x1);
	xmax = MAX(x, x1);
	ymin = MIN(y, y1);
	ymax = MAX(y, y1);

	
	for(i=xmin+1; i<=xmax; i++){
		set_xy(i, ymin, box_line_h);
		set_xy(i, ymax, box_line_h);
	}
	for(i=ymin+1; i<=ymax; i++){
		set_xy(xmin, i, box_line_v);
		set_xy(xmax, i, box_line_v);
	}
	set_xy(xmin, ymin, corner);
	set_xy(xmin, ymax, corner);
	set_xy(xmax, ymin, corner);
	set_xy(xmax, ymax, corner);
}

void draw_box(int x1, int y1){

	int xmin, ymin, xmax, ymax;
	int i;
	
	xmin = MIN(x, x1);
	xmax = MAX(x, x1);
	ymin = MIN(y, y1);
	ymax = MAX(y, y1);

	
	for(i=xmin+1; i<=xmax; i++){
		draw_xy(i, ymin, box_line_h);
		draw_xy(i, ymax, box_line_h);
	}
	for(i=ymin+1; i<=ymax; i++){
		draw_xy(xmin, i, box_line_v);
		draw_xy(xmax, i, box_line_v);
	}
	draw_xy(xmin, ymin, corner);
	draw_xy(xmin, ymax, corner);
	draw_xy(xmax, ymin, corner);
	draw_xy(xmax, ymax, corner);
	show_cursor();
}


void get_box(){
	char c;
	int orig_x=x, orig_y=y;

	set(PTR);
	redraw();
	while((c=getchar())!=EOF && c != 27){
		switch(c){
			case 'H': step = 5;
			case 'h': 
				x -= step;
				break;	
			case 'J': step = 5;
			case 'j':
				y += step;
				break;
			case 'K': step = 5;
			case 'k':
				y -= step;
				break;
			case 'L': step = 5;
			case 'l':
				x += step;
				break; 	
		}
		check_bound();
		redraw();
		draw_box(orig_x, orig_y);
		status_bar();
		show_cursor();
	}
	fix_box(orig_x, orig_y);
	redraw();
}


int commands(){

	char c;
	while((c=getchar())!=EOF){
		//screen[y][x]=BG;
		switch(c){
			case 'H':
				step=5;
			case 'h':
				x-=step;
				break;
			case 'J':
				step=5;
			case 'j':
				y+=step;
				break;
			case 'K':
				step=5;
			case 'k':
				y-=step;
				break;
			case 'L':
				step=5;
			case 'l':
				x+=step;
				break;
			case 'i':
				state = TEXT;
				get_text();
				break;
			case 'r':
				redraw();
				break;
			case 'b':
				get_box();
				break;
			case 'Q':
			case 'q':
				cleanup(0);
				exit(0);
				break;
			default:;
				//statu("got: %d\n", c);
		}
		check_bound();
		//update();
		//redraw();
		status_bar();
		show_cursor();
		step = 1;
	}

}




int main(int argc, char *argv[]){

	init();

	commands();
	cleanup(0);
}