#include "idris_directory.h"

#include <dirent.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "idris_util.h"

char *idris2_currentDirectory() {
  char *cwd = malloc(1024); // probably ought to deal with the unlikely event of
                            // this being too small
  IDRIS2_VERIFY(cwd, "malloc failed");
  return getcwd(cwd, 1024); // Freed by RTS
}

int idris2_changeDir(char *dir) { return chdir(dir); }

int idris2_createDir(char *dir) {
#ifdef _WIN32
  return mkdir(dir);
#else
  return mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO);
#endif
}

typedef struct {
  DIR *dirptr;
} DirInfo;

void *idris2_openDir(char *dir) {
  DIR *d = opendir(dir);
  if (d == NULL) {
    return NULL;
  } else {
    DirInfo *di = malloc(sizeof(DirInfo));
    IDRIS2_VERIFY(di, "malloc failed");
    di->dirptr = d;

    return (void *)di;
  }
}

void idris2_closeDir(void *d) {
  DirInfo *di = (DirInfo *)d;

  IDRIS2_VERIFY(closedir(di->dirptr) == 0, "closedir failed: %s",
                strerror(errno));
  free(di);
}

int idris2_removeDir(char *path) { return rmdir(path); }

char *idris2_nextDirEntry(void *d) {
  DirInfo *di = (DirInfo *)d;
  // `readdir` keeps `errno` unchanged on end of stream
  // so we need to reset `errno` to distinguish between
  // end of stream and failure.
  errno = 0;
  struct dirent *de = readdir(di->dirptr);

  if (de == NULL) {
    return NULL;
  } else {
    return de->d_name;
  }
}