import json
import pytest
import networkx as nx
from networkx.readwrite.json_graph import *


class TestAdjacency:

    def test_graph(self):
        G = nx.path_graph(4)
        H = adjacency_graph(adjacency_data(G))
        nx.is_isomorphic(G, H)

    def test_graph_attributes(self):
        G = nx.path_graph(4)
        G.add_node(1, color='red')
        G.add_edge(1, 2, width=7)
        G.graph['foo'] = 'bar'
        G.graph[1] = 'one'

        H = adjacency_graph(adjacency_data(G))
        assert H.graph['foo'] == 'bar'
        assert H.nodes[1]['color'] == 'red'
        assert H[1][2]['width'] == 7

        d = json.dumps(adjacency_data(G))
        H = adjacency_graph(json.loads(d))
        assert H.graph['foo'] == 'bar'
        assert H.graph[1] == 'one'
        assert H.nodes[1]['color'] == 'red'
        assert H[1][2]['width'] == 7

    def test_digraph(self):
        G = nx.DiGraph()
        nx.add_path(G, [1, 2, 3])
        H = adjacency_graph(adjacency_data(G))
        assert H.is_directed()
        nx.is_isomorphic(G, H)

    def test_multidigraph(self):
        G = nx.MultiDiGraph()
        nx.add_path(G, [1, 2, 3])
        H = adjacency_graph(adjacency_data(G))
        assert H.is_directed()
        assert H.is_multigraph()

    def test_multigraph(self):
        G = nx.MultiGraph()
        G.add_edge(1, 2, key='first')
        G.add_edge(1, 2, key='second', color='blue')
        H = adjacency_graph(adjacency_data(G))
        nx.is_isomorphic(G, H)
        assert H[1][2]['second']['color'] == 'blue'

    def test_exception(self):
        with pytest.raises(nx.NetworkXError):
            G = nx.MultiDiGraph()
            attrs = dict(id='node', key='node')
            adjacency_data(G, attrs)