# The MIT License (MIT)
#
# Copyright (c) 2019 Henry Zhao
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import networkx as nx
import matplotlib.pyplot as plt


class Drawer:
    """ Drawer base class

        Attributes:
            map (nx.DiGraph): directed acyclic graph
    """

    def __init__(self):
        self._map = nx.DiGraph()

    def add(self, node) -> None:
        self._map.add_node(node)

    def link(self, source = None, destination = None) -> None:
        if source and destination:
            edge = (source, destination)
            self._map.add_edge(*edge)

    def illustrate(self, labeled = True) -> None:
        nx.draw(self._map, with_labels=labeled)
        plt.show()
