from ghp.errors import HpgitError
from git import base, GitCommandError

class NoteAlreadyExistsError(HpgitError):
    """Exception thrown by note related commands"""
    pass


def add_note(self, message, force=False, note_ref='refs/notes/commits'):
    """
    Add a note to an object, tossing a NoteError exception if the object is
    already annotated.
    :param message:     note message
    :param force:       if true, any existing note will be overwritten
    :param note_ref:    ref to use for notes. Defaults to refs/notes/commits
    """
    if force:
            self.repo.git.notes('--ref', note_ref, 'add', '-f', '-m', message,
                                str(self))
    else:
        try:
            self.repo.git.notes('--ref', note_ref, 'add', '-m', message,
                                str(self))
        except GitCommandError as e:
            if e.status == 1:
                raise NoteAlreadyExistsError(e.message)
            else:
                raise e

def append_note(self, message, note_ref='refs/notes/commits'):
    """Add a note to an object
    :param message:     note message
    :param note_ref:    ref to use for notes. Defaults to refs/notes/commits
    """
    self.repo.git.notes('--ref', note_ref, 'append', '-m', message, str(self))

def note_message(self, note_ref='refs/notes/commits'):
    """
    Return note message
    :param note_ref:    ref to use for notes. Defaults to refs/notes/commits
    """
    try:
        return self.repo.git.notes('--ref', note_ref, 'show', str(self))
    except GitCommandError as e:
        if e.status == 1:
            return None
        else:
            raise e

base.Object.add_note = add_note
base.Object.append_note = append_note
base.Object.note = note_message