#include "uv.h"
#include "wasi_rights.h"
#include "wasi_types.h"


uvwasi_errno_t uvwasi__get_rights(uv_file fd,
                                  int flags,
                                  uvwasi_filetype_t type,
                                  uvwasi_rights_t* rights_base,
                                  uvwasi_rights_t* rights_inheriting) {
  int read_or_write_only;

  if (type == UVWASI_FILETYPE_UNKNOWN)
    return UVWASI_EINVAL;

  switch (type) {
    case UVWASI_FILETYPE_REGULAR_FILE:
      *rights_base = UVWASI__RIGHTS_REGULAR_FILE_BASE;
      *rights_inheriting = UVWASI__RIGHTS_REGULAR_FILE_INHERITING;
      break;

    case UVWASI_FILETYPE_DIRECTORY:
      *rights_base = UVWASI__RIGHTS_DIRECTORY_BASE;
      *rights_inheriting = UVWASI__RIGHTS_DIRECTORY_INHERITING;
      break;

    case UVWASI_FILETYPE_SOCKET_STREAM:
    case UVWASI_FILETYPE_SOCKET_DGRAM:
      *rights_base = UVWASI__RIGHTS_SOCKET_BASE;
      *rights_inheriting = UVWASI__RIGHTS_SOCKET_INHERITING;
      break;

    case UVWASI_FILETYPE_CHARACTER_DEVICE:
      if (uv_guess_handle(fd) == UV_TTY) {
        *rights_base = UVWASI__RIGHTS_TTY_BASE;
        *rights_inheriting = UVWASI__RIGHTS_TTY_INHERITING;
      } else {
        *rights_base = UVWASI__RIGHTS_CHARACTER_DEVICE_BASE;
        *rights_inheriting = UVWASI__RIGHTS_CHARACTER_DEVICE_INHERITING;
      }
      break;

    case UVWASI_FILETYPE_BLOCK_DEVICE:
      *rights_base = UVWASI__RIGHTS_BLOCK_DEVICE_BASE;
      *rights_inheriting = UVWASI__RIGHTS_BLOCK_DEVICE_INHERITING;
      break;

    default:
      *rights_base = 0;
      *rights_inheriting = 0;
  }

  /* Disable read/write bits depending on access mode. */
  read_or_write_only = flags & (UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR);

  if (read_or_write_only == UV_FS_O_RDONLY)
    *rights_base &= ~UVWASI_RIGHT_FD_WRITE;
  else if (read_or_write_only == UV_FS_O_WRONLY)
    *rights_base &= ~UVWASI_RIGHT_FD_READ;

  return UVWASI_ESUCCESS;
}