#include "termio.h"

/* c_iflag bit masks */
#define ifl_RAW (~(IMAXBEL))
/* NOTE: the line below won't work, bad bitwise ops */
#define ifl_NOPARITY ((IGNPAR) & ~(PARMRK | INPCK | ISTRIP))

/* c_cflag bit masks */
#define cfl_NOPARITY (~(PARENB))

/* c_lflag bit masks */
#define lfl_RAW (~(ISIG | ICANON))
#define lfl_ECHO ((ECHO | ECHOE | ECHOK | ECHONL | ECHO))
// & ~(ECHOCTL | ECHOPRT | ECHOKE))

/*
 * NOTE: This function is taken from the GNU C Library (glibc),
 * NOTE: specifically `glibc/termios/cfmakeraw.c`.
 */
int termmode_raw(struct ct_term *restrict const term) {
  term->termios.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
  term->termios.c_oflag &= ~OPOST;
  term->termios.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
  term->termios.c_cflag &= ~(CSIZE|PARENB);
  term->termios.c_cflag |= CS8;
  term->termios.c_cc[VMIN] = 1; /* read returns when one char is available.  */
  term->termios.c_cc[VTIME] = 0;
  return ct_applyterm(term);
}

int termmode_canon(struct ct_term *restrict const term) {
  /* TODO: inverse of termmode_raw */
  term->termios.c_lflag &= ~lfl_RAW & lfl_ECHO;
  return ct_applyterm(term);
}

/* Set ncurses terminal mode (buffering, character processing,
 * Key->SIG handling, and other termios(3) functionality).
 */
static inline int termmode(struct ct_term *restrict const term,
                           const enum crs_termmode mode) {
  switch (mode) {
  case TMODE_RAW:
    return termmode_raw(term);
  case TMODE_CANON:
    return termmode_canon(term); /* ITS A CANON EVENT OHMAHGOH */
  default:
    /* defaulting is not possible. */
    return 1;
  }
}