# Most of this is copied from Twisted 11.0. The reason for this hack is that
# twisted.internet.inotify can't be imported when the platform does not support inotify.


# from /usr/src/linux/include/linux/inotify.h

IN_ACCESS = 0x00000001L         # File was accessed
IN_MODIFY = 0x00000002L         # File was modified
IN_ATTRIB = 0x00000004L         # Metadata changed
IN_CLOSE_WRITE = 0x00000008L    # Writeable file was closed
IN_CLOSE_NOWRITE = 0x00000010L  # Unwriteable file closed
IN_OPEN = 0x00000020L           # File was opened
IN_MOVED_FROM = 0x00000040L     # File was moved from X
IN_MOVED_TO = 0x00000080L       # File was moved to Y
IN_CREATE = 0x00000100L         # Subfile was created
IN_DELETE = 0x00000200L         # Subfile was delete
IN_DELETE_SELF = 0x00000400L    # Self was deleted
IN_MOVE_SELF = 0x00000800L      # Self was moved
IN_UNMOUNT = 0x00002000L        # Backing fs was unmounted
IN_Q_OVERFLOW = 0x00004000L     # Event queued overflowed
IN_IGNORED = 0x00008000L        # File was ignored

IN_ONLYDIR = 0x01000000         # only watch the path if it is a directory
IN_DONT_FOLLOW = 0x02000000     # don't follow a sym link
IN_MASK_ADD = 0x20000000        # add to the mask of an already existing watch
IN_ISDIR = 0x40000000           # event occurred against dir
IN_ONESHOT = 0x80000000         # only send event once

IN_CLOSE = IN_CLOSE_WRITE | IN_CLOSE_NOWRITE     # closes
IN_MOVED = IN_MOVED_FROM | IN_MOVED_TO           # moves
IN_CHANGED = IN_MODIFY | IN_ATTRIB               # changes

IN_WATCH_MASK = (IN_MODIFY | IN_ATTRIB |
                 IN_CREATE | IN_DELETE |
                 IN_DELETE_SELF | IN_MOVE_SELF |
                 IN_UNMOUNT | IN_MOVED_FROM | IN_MOVED_TO)


_FLAG_TO_HUMAN = [
    (IN_ACCESS, 'access'),
    (IN_MODIFY, 'modify'),
    (IN_ATTRIB, 'attrib'),
    (IN_CLOSE_WRITE, 'close_write'),
    (IN_CLOSE_NOWRITE, 'close_nowrite'),
    (IN_OPEN, 'open'),
    (IN_MOVED_FROM, 'moved_from'),
    (IN_MOVED_TO, 'moved_to'),
    (IN_CREATE, 'create'),
    (IN_DELETE, 'delete'),
    (IN_DELETE_SELF, 'delete_self'),
    (IN_MOVE_SELF, 'move_self'),
    (IN_UNMOUNT, 'unmount'),
    (IN_Q_OVERFLOW, 'queue_overflow'),
    (IN_IGNORED, 'ignored'),
    (IN_ONLYDIR, 'only_dir'),
    (IN_DONT_FOLLOW, 'dont_follow'),
    (IN_MASK_ADD, 'mask_add'),
    (IN_ISDIR, 'is_dir'),
    (IN_ONESHOT, 'one_shot')
]



def humanReadableMask(mask):
    """
    Auxiliary function that converts an hexadecimal mask into a series
    of human readable flags.
    """
    s = []
    for k, v in _FLAG_TO_HUMAN:
        if k & mask:
            s.append(v)
    return s


# This class is not copied from Twisted; it acts as a mock.
class INotify(object):
    def startReading(self):
        pass

    def stopReading(self):
        pass

    def watch(self, filepath, mask=IN_WATCH_MASK, autoAdd=False, callbacks=None, recursive=False):
        self.callbacks = callbacks

    def event(self, filepath, mask):
        for cb in self.callbacks:
            cb(None, filepath, mask)


__all__ = ["INotify", "humanReadableMask", "IN_WATCH_MASK", "IN_ACCESS",
           "IN_MODIFY", "IN_ATTRIB", "IN_CLOSE_NOWRITE", "IN_CLOSE_WRITE",
           "IN_OPEN", "IN_MOVED_FROM", "IN_MOVED_TO", "IN_CREATE",
           "IN_DELETE", "IN_DELETE_SELF", "IN_MOVE_SELF", "IN_UNMOUNT",
           "IN_Q_OVERFLOW", "IN_IGNORED", "IN_ONLYDIR", "IN_DONT_FOLLOW",
           "IN_MASK_ADD", "IN_ISDIR", "IN_ONESHOT", "IN_CLOSE",
           "IN_MOVED", "IN_CHANGED"]