# -*- coding: utf-8 -*-
"""
    Unit tests for adjlist.
"""
import io
import pytest
import os
import tempfile
import networkx as nx
from networkx.testing import (assert_nodes_equal, assert_edges_equal,
                              assert_graphs_equal)


class TestAdjlist():

    @classmethod
    def setup_class(cls):
        cls.G = nx.Graph(name="test")
        e = [('a', 'b'), ('b', 'c'), ('c', 'd'), ('d', 'e'), ('e', 'f'), ('a', 'f')]
        cls.G.add_edges_from(e)
        cls.G.add_node('g')
        cls.DG = nx.DiGraph(cls.G)
        cls.XG = nx.MultiGraph()
        cls.XG.add_weighted_edges_from([(1, 2, 5), (1, 2, 5), (1, 2, 1), (3, 3, 42)])
        cls.XDG = nx.MultiDiGraph(cls.XG)

    def test_read_multiline_adjlist_1(self):
        # Unit test for https://networkx.lanl.gov/trac/ticket/252
        s = b"""# comment line
1 2
# comment line
2
3
"""
        bytesIO = io.BytesIO(s)
        G = nx.read_multiline_adjlist(bytesIO)
        adj = {'1': {'3': {}, '2': {}}, '3': {'1': {}}, '2': {'1': {}}}
        assert_graphs_equal(G, nx.Graph(adj))

    def test_unicode(self):
        G = nx.Graph()
        try:  # Python 3.x
            name1 = chr(2344) + chr(123) + chr(6543)
            name2 = chr(5543) + chr(1543) + chr(324)
        except ValueError:  # Python 2.6+
            name1 = unichr(2344) + unichr(123) + unichr(6543)
            name2 = unichr(5543) + unichr(1543) + unichr(324)
        G.add_edge(name1, 'Radiohead', **{name2: 3})
        fd, fname = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname)
        assert_graphs_equal(G, H)
        os.close(fd)
        os.unlink(fname)

    def test_latin1_err(self):
        G = nx.Graph()
        try:  # Python 3.x
            name1 = chr(2344) + chr(123) + chr(6543)
            name2 = chr(5543) + chr(1543) + chr(324)
        except ValueError:  # Python 2.6+
            name1 = unichr(2344) + unichr(123) + unichr(6543)
            name2 = unichr(5543) + unichr(1543) + unichr(324)
        G.add_edge(name1, 'Radiohead', **{name2: 3})
        fd, fname = tempfile.mkstemp()
        pytest.raises(UnicodeEncodeError,
                      nx.write_multiline_adjlist,
                      G, fname, encoding='latin-1')
        os.close(fd)
        os.unlink(fname)

    def test_latin1(self):
        G = nx.Graph()
        try:  # Python 3.x
            blurb = chr(1245)  # just to trigger the exception
            name1 = 'Bj' + chr(246) + 'rk'
            name2 = chr(220) + 'ber'
        except ValueError:  # Python 2.6+
            name1 = 'Bj' + unichr(246) + 'rk'
            name2 = unichr(220) + 'ber'
        G.add_edge(name1, 'Radiohead', **{name2: 3})
        fd, fname = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname, encoding='latin-1')
        H = nx.read_multiline_adjlist(fname, encoding='latin-1')
        assert_graphs_equal(G, H)
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_graph(self):
        G = self.G
        (fd, fname) = tempfile.mkstemp()
        nx.write_adjlist(G, fname)
        H = nx.read_adjlist(fname)
        H2 = nx.read_adjlist(fname)
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_digraph(self):
        G = self.DG
        (fd, fname) = tempfile.mkstemp()
        nx.write_adjlist(G, fname)
        H = nx.read_adjlist(fname, create_using=nx.DiGraph())
        H2 = nx.read_adjlist(fname, create_using=nx.DiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_integers(self):
        (fd, fname) = tempfile.mkstemp()
        G = nx.convert_node_labels_to_integers(self.G)
        nx.write_adjlist(G, fname)
        H = nx.read_adjlist(fname, nodetype=int)
        H2 = nx.read_adjlist(fname, nodetype=int)
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_multigraph(self):
        G = self.XG
        (fd, fname) = tempfile.mkstemp()
        nx.write_adjlist(G, fname)
        H = nx.read_adjlist(fname, nodetype=int,
                            create_using=nx.MultiGraph())
        H2 = nx.read_adjlist(fname, nodetype=int,
                             create_using=nx.MultiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_multidigraph(self):
        G = self.XDG
        (fd, fname) = tempfile.mkstemp()
        nx.write_adjlist(G, fname)
        H = nx.read_adjlist(fname, nodetype=int,
                            create_using=nx.MultiDiGraph())
        H2 = nx.read_adjlist(fname, nodetype=int,
                             create_using=nx.MultiDiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_adjlist_delimiter(self):
        fh = io.BytesIO()
        G = nx.path_graph(3)
        nx.write_adjlist(G, fh, delimiter=':')
        fh.seek(0)
        H = nx.read_adjlist(fh, nodetype=int, delimiter=':')
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))


class TestMultilineAdjlist():

    @classmethod
    def setup_class(cls):
        cls.G = nx.Graph(name="test")
        e = [('a', 'b'), ('b', 'c'), ('c', 'd'), ('d', 'e'), ('e', 'f'), ('a', 'f')]
        cls.G.add_edges_from(e)
        cls.G.add_node('g')
        cls.DG = nx.DiGraph(cls.G)
        cls.DG.remove_edge('b', 'a')
        cls.DG.remove_edge('b', 'c')
        cls.XG = nx.MultiGraph()
        cls.XG.add_weighted_edges_from([(1, 2, 5), (1, 2, 5), (1, 2, 1), (3, 3, 42)])
        cls.XDG = nx.MultiDiGraph(cls.XG)

    def test_multiline_adjlist_graph(self):
        G = self.G
        (fd, fname) = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname)
        H2 = nx.read_multiline_adjlist(fname)
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_multiline_adjlist_digraph(self):
        G = self.DG
        (fd, fname) = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname, create_using=nx.DiGraph())
        H2 = nx.read_multiline_adjlist(fname, create_using=nx.DiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_multiline_adjlist_integers(self):
        (fd, fname) = tempfile.mkstemp()
        G = nx.convert_node_labels_to_integers(self.G)
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname, nodetype=int)
        H2 = nx.read_multiline_adjlist(fname, nodetype=int)
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_multiline_adjlist_multigraph(self):
        G = self.XG
        (fd, fname) = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname, nodetype=int,
                                      create_using=nx.MultiGraph())
        H2 = nx.read_multiline_adjlist(fname, nodetype=int,
                                       create_using=nx.MultiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_multiline_adjlist_multidigraph(self):
        G = self.XDG
        (fd, fname) = tempfile.mkstemp()
        nx.write_multiline_adjlist(G, fname)
        H = nx.read_multiline_adjlist(fname, nodetype=int,
                                      create_using=nx.MultiDiGraph())
        H2 = nx.read_multiline_adjlist(fname, nodetype=int,
                                       create_using=nx.MultiDiGraph())
        assert H != H2  # they should be different graphs
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))
        os.close(fd)
        os.unlink(fname)

    def test_multiline_adjlist_delimiter(self):
        fh = io.BytesIO()
        G = nx.path_graph(3)
        nx.write_multiline_adjlist(G, fh, delimiter=':')
        fh.seek(0)
        H = nx.read_multiline_adjlist(fh, nodetype=int, delimiter=':')
        assert_nodes_equal(list(H), list(G))
        assert_edges_equal(list(H.edges()), list(G.edges()))