#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE

#include <signal.h>    // for signal, SIGWINCH
#include <stdlib.h>    // for exit
#include <stdio.h>     // for NULL
#include <unistd.h>    // for STDOUT_FILENO

#include "fn.h"
#include "file.h"      // for editorOpen
#include "input.h"     // for editorProcessKeypress
#include "output.h"    // for editorRefreshScreen, editorSetStatusMessage
#include "terminal.h"  // for die, setWindowSize, enableRawMode


void windowResizeCallback(int signum) {
  if (signum != SIGWINCH) {
    return;
  }

  if (setWindowSize(&E.screenrows, &E.screencols) == -1) {
    die("setWindowSize");
  }
  E.screenrows -= 2;
  editorRefreshScreen();
}

void initEditor() {
  E.cx = 0;
  E.cy = 0;
  E.rx = 0;
  E.rowoff = 0;
  E.coloff = 0;
  E.numrows = 0;
  E.row = NULL;
  E.dirty = 0;
  E.filename = NULL;
  E.statusmsg[0] = '\0';
  E.statusmsg_time = 0;
  E.syntax = NULL;

  if (setWindowSize(&E.screenrows, &E.screencols) == -1) {
      die("setWindowSize");
  }
  E.screenrows -= 2;
}

void exitEditor() {
  // Restore from raw mode and exit
  write(STDOUT_FILENO, "\x1b[2J", 4);
  write(STDOUT_FILENO, "\x1b[H", 3);
  exit(0);
}


int main(int argc, char *argv[]) {
  enableRawMode();
  initEditor();
  if (argc >= 2) {
    editorOpen(argv[1]);
  }

  editorSetStatusMessage("Ctrl-C = Quit, Ctrl-S = save, Ctrl-F = find");

  signal(SIGWINCH, windowResizeCallback);

  while (1) {
    editorRefreshScreen();
    editorProcessKeypress();
  }

  exitEditor();
  return 0;
}