# This is part of Kaylee
# -- this code is licensed GPLv3
# Copyright 2015-2016 Clayton G. Hobbs
# Portions Copyright 2013 Jezra

from abc import ABCMeta, abstractmethod

from gi.repository import GObject
from gi.types import GObjectMeta


class GObjectABCMeta(ABCMeta, GObjectMeta):
    pass


class PluginBase(GObject.Object, metaclass=GObjectABCMeta):
    """Base class for Kaylee plugins

    Each Kaylee plugin module must define a subclass of this class, named
    ``Plugin``.
    """

    __gsignals__ = {
        'processed' : (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE,
                      (GObject.TYPE_STRING,))
    }

    def __init__(self, config, name):
        """Initialize the plugin

        All strings to be included in the corpus should be elements of
        ``corpus_strings`` by the end of __init__'s execution.  Note however
        that the words required for number support are automatically included,
        so they need not be listed explicitly on a per-plugin basis.
        """
        super().__init__()
        self.config = config
        self.name = name
        self.corpus_strings = set()

    @abstractmethod
    def recognizer_finished(self, recognizer, text):
        """Process a recognized voice command

        This method must return True if the command was handled by the plugin,
        and False otherwise.  As soon as it has been determined that the
        command will be handled, this method must emit a ``processed`` signal
        with ``text`` as its parameter.
        """
        pass