#include <locale.h>
#include <unistd.h>

#include "curse.h"

#define BASE_DELAY 1000000
#define CRS_LOCALE "en_US.UTF-8"

/* Set ncurses terminal mode (buffering, character processing,
 * Key->SIG handling, and other termios(3) functionality).
 */
int termmode(const enum crs_termmode mode) {
  switch (mode) {
  case TMODE_CBREAK:
    return cbreak();
  case TMODE_RAW:
    return raw();
  case TMODE_NOCBREAK:
    return nocbreak();
  case TMODE_NORAW:
    return noraw();
  default:
    /* defaulting is not possible. */
    return 1;
  }
}

/* Apply a default IO configuration for an ncurses WINDOW.
 */
static inline void __conf_window(WINDOW *const win) {
  nodelay(win, TRUE); // getch(3x) nonblocking IO
  keypad(win, TRUE);  // allow function keys
  // intrflush(3x) - flush terminal input buffer on interrupt key
  intrflush(win, FALSE);
}

/* Initialise ncurses for our usecase.
 * WARNING: This function should only be called once.
 */
void init_ncurses(void) {
  // ncurses expects a locale for consistent behaviour
  setlocale(LC_ALL, CRS_LOCALE);

  /* NCurses Init */
  initscr();
  /* WARNING: no you shouldn't delwin(stdscr) it breaks everything... */
  __conf_window(stdscr);
  start_color();

  /* Screen Configuration */
  termmode(TMODE_CBREAK);
  noecho(); // manually echo from getch(3x)

  curs_set(0); // hide cursor
}

/* Initialise (with default IO configuration) a new ncurses WINDOW.
 */
WINDOW *new_window(const int x, const int y, const int width,
                   const int height) {
  WINDOW *win = newwin(height, width, y, x);
  __conf_window(win);

  return win;
}

/* Initialise (with default IO configuration) the root ncurses WINDOW.
 * NOTE: This is typically done via initscr(3x) and called "stdscr".
 */
WINDOW *root_window(void) {
  WINDOW *rootwin = new_window(0, 0, COLS, LINES);
  __conf_window(rootwin);
  return rootwin;
}

/* Resize and move (if resized successfully) an ncurses WINDOW.
 * Returns ERR (1) on fail, and OK (0) on success.
 * NOTE: Failure occurs if width or height <= 0,
 * NOTE: or if the x,y coordinate is outside the screen bounds.
 */
int resizemv_window(const int x, const int y, const int width, const int height,
                    WINDOW *const win) {
  return wresize(win, height, width) || mvwin(win, y, x);
}