#pragma once

#include <cstddef>
#include <cstdlib>
#include <cstdio>

#include <unistd.h>
#include <termios.h>

struct Screen {
    char *buf;
    std::size_t w, h;

    float dx = 0, dy = 0;
    float sx = 1, sy = 1;

    void draw();
    void clear();

    char &at(std::size_t n);
    char &at(std::size_t x, std::size_t y);

    void resize(std::size_t n);
    void resize(std::size_t x, std::size_t y);

    Screen(std::size_t n) : buf(nullptr) { resize(n); }
    Screen(std::size_t x, std::size_t y) : buf(nullptr) { resize(x, y); }
    ~Screen() { delete[] buf; }

private:
    char _dummy;

    static inline void gotoxy(int x, int y)
    {
	std::printf("\033[%d;%dH", y, x);
    }
};

static termios old, current;
static inline void enter_noncanonical_mode(void)
{
    tcgetattr(STDIN_FILENO, &old);
    current = old;
    current.c_lflag &= ~ICANON; /* disable buffered i/o */
    current.c_lflag &= ~ECHO; /* set no echo mode */
    current.c_cc[VMIN] = 0;/* no wait */
    current.c_cc[VTIME] = 0;/* no wait */

    tcsetattr(STDIN_FILENO, TCSANOW, &current);
}
static inline void enter_canonical_mode(void){ tcsetattr(0, TCSANOW, &old); }