#!/usr/bin/env python
"""Original NetworkX graph tests"""
import pytest
import networkx
import networkx as nx
from networkx.testing.utils import *

from .historical_tests import HistoricalTests


class TestDiGraphHistorical(HistoricalTests):

    @classmethod
    def setup_class(cls):
        HistoricalTests.setup_class()
        cls.G = nx.DiGraph

    def test_in_degree(self):
        G = self.G()
        G.add_nodes_from('GJK')
        G.add_edges_from([('A', 'B'), ('A', 'C'), ('B', 'D'),
                          ('B', 'C'), ('C', 'D')])

        assert sorted(d for n, d in G.in_degree()) == [0, 0, 0, 0, 1, 2, 2]
        assert (dict(G.in_degree()) ==
                     {'A': 0, 'C': 2, 'B': 1, 'D': 2, 'G': 0, 'K': 0, 'J': 0})

    def test_out_degree(self):
        G = self.G()
        G.add_nodes_from('GJK')
        G.add_edges_from([('A', 'B'), ('A', 'C'), ('B', 'D'),
                          ('B', 'C'), ('C', 'D')])
        assert (sorted([v for k, v in G.in_degree()]) ==
                     [0, 0, 0, 0, 1, 2, 2])
        assert (dict(G.out_degree()) ==
                     {'A': 2, 'C': 1, 'B': 2, 'D': 0, 'G': 0, 'K': 0, 'J': 0})

    def test_degree_digraph(self):
        H = nx.DiGraph()
        H.add_edges_from([(1, 24), (1, 2)])
        assert sorted(d for n, d in H.in_degree([1, 24])) == [0, 1]
        assert sorted(d for n, d in H.out_degree([1, 24])) == [0, 2]
        assert sorted(d for n, d in H.degree([1, 24])) == [1, 2]

    def test_neighbors(self):
        G = self.G()
        G.add_nodes_from('GJK')
        G.add_edges_from([('A', 'B'), ('A', 'C'), ('B', 'D'),
                          ('B', 'C'), ('C', 'D')])

        assert sorted(G.neighbors('C')) == ['D']
        assert sorted(G['C']) == ['D']
        assert sorted(G.neighbors('A')) == ['B', 'C']
        pytest.raises(nx.NetworkXError, G.neighbors, 'j')
        pytest.raises(nx.NetworkXError, G.neighbors, 'j')

    def test_successors(self):
        G = self.G()
        G.add_nodes_from('GJK')
        G.add_edges_from([('A', 'B'), ('A', 'C'), ('B', 'D'),
                          ('B', 'C'), ('C', 'D')])
        assert sorted(G.successors('A')) == ['B', 'C']
        assert sorted(G.successors('A')) == ['B', 'C']
        assert sorted(G.successors('G')) == []
        assert sorted(G.successors('D')) == []
        assert sorted(G.successors('G')) == []
        pytest.raises(nx.NetworkXError, G.successors, 'j')
        pytest.raises(nx.NetworkXError, G.successors, 'j')

    def test_predecessors(self):
        G = self.G()
        G.add_nodes_from('GJK')
        G.add_edges_from([('A', 'B'), ('A', 'C'), ('B', 'D'),
                          ('B', 'C'), ('C', 'D')])
        assert sorted(G.predecessors('C')) == ['A', 'B']
        assert sorted(G.predecessors('C')) == ['A', 'B']
        assert sorted(G.predecessors('G')) == []
        assert sorted(G.predecessors('A')) == []
        assert sorted(G.predecessors('G')) == []
        assert sorted(G.predecessors('A')) == []
        assert sorted(G.successors('D')) == []

        pytest.raises(nx.NetworkXError, G.predecessors, 'j')
        pytest.raises(nx.NetworkXError, G.predecessors, 'j')

    def test_reverse(self):
        G = nx.complete_graph(10)
        H = G.to_directed()
        HR = H.reverse()
        assert nx.is_isomorphic(H, HR)
        assert sorted(H.edges()) == sorted(HR.edges())

    def test_reverse2(self):
        H = nx.DiGraph()
        foo = [H.add_edge(u, u + 1) for u in range(0, 5)]
        HR = H.reverse()
        for u in range(0, 5):
            assert HR.has_edge(u + 1, u)

    def test_reverse3(self):
        H = nx.DiGraph()
        H.add_nodes_from([1, 2, 3, 4])
        HR = H.reverse()
        assert sorted(HR.nodes()) == [1, 2, 3, 4]