#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE

#include <errno.h>     // for errno
#include <fcntl.h>     // for open, O_CREAT, O_RDWR
#include <stdio.h>     // for NULL, fclose, fopen, FILE
#include <stdlib.h>    // for free
#include <string.h>    // for strdup, strerror
#include <unistd.h>    // for close, ftruncate, ssize_t
#include <termios.h>   // for termios

#include "file.h"
#include "fn.h"        // for editorSetStatusMessage, E, editorConfig, edito...
#include "hl.h"        // for editorSelectSyntaxHighlight
#include "row.h"       // for editorRowsToString
#include "terminal.h"  // for die

void editorOpen(char *filename) {
  free(E.filename);
  // TODO: Maybe replace strdup (string.h), becaus it is no strict posix c lib
  E.filename = strdup(filename);

  editorSelectSyntaxHighlight();

  FILE *fp = fopen(filename, "r");
  if (!fp) die("fopen");

  char *line = NULL;
  size_t linecap = 0;
  ssize_t linelen;
  while ((linelen = getline(&line, &linecap, fp)) != -1) {
    while (linelen > 0 && (line[linelen - 1] == '\n' ||
                           line[linelen - 1] == '\r'))
      linelen--;
    editorInsertRow(E.numrows, line, linelen);
  }
  free(line);
  fclose(fp);
  E.dirty = 0;
}

void editorSave() {
  if (E.filename == NULL) {
    E.filename = editorPrompt("Save as: %s (ESC to cancel)", NULL);
    if (E.filename == NULL) {
      editorSetStatusMessage("Save aborted");
      return;
    }
  }

  int len;

  char *buf = editorRowsToString(&len);

  int fd = open(E.filename, O_RDWR | O_CREAT, 0644);
  if (fd != -1) {
    if (ftruncate(fd, len) != -1) {
      if (write(fd, buf, len) == len) {
        close(fd);
        free(buf);
        E.dirty = 0;
        editorSetStatusMessage("%d bytes written to disk", len);
        return;
      }
      editorSelectSyntaxHighlight();
    }
    close(fd);
  }

  free(buf);
  editorSetStatusMessage("Can't save! I/O error: %s", strerror(errno));
}