import networkx as nx
import pytest

from lang_main.analysis import graphs

TK_GRAPH_NAME = 'TEST_TOKEN_GRAPH'


def build_init_graph(token_graph: bool):
    edge_weights = [
        {'weight': 1},
        {'weight': 2},
        {'weight': 3},
        {'weight': 4},
        {'weight': 5},
        {'weight': 6},
    ]
    edges = [
        (1, 2),
        (1, 3),
        (2, 4),
        (3, 4),
        (1, 4),
        (2, 1),
    ]
    edges_to_add = []
    for i, edge in enumerate(edges):
        edge = list(edge)
        edge.append(edge_weights[i])  # type: ignore
        edges_to_add.append(tuple(edge))

    if token_graph:
        G = graphs.TokenGraph(name=TK_GRAPH_NAME, enable_logging=False)
    else:
        G = nx.DiGraph()

    G.add_edges_from(edges_to_add)

    return G


@pytest.fixture(scope='module')
def graph():
    return build_init_graph(token_graph=False)


@pytest.fixture(scope='module')
def tk_graph():
    return build_init_graph(token_graph=True)


def test_graph_size(graph):
    assert len(graph.nodes) == 4
    assert len(graph.edges) == 6


def test_save_to_GraphML(graph, tmp_path):
    filename = 'test_graphML'
    graphs.save_to_GraphML(graph, saving_path=tmp_path, filename=filename)
    saved_file = (tmp_path / filename).with_suffix('.graphml')
    assert saved_file.exists()


def test_metadata_retrieval(graph):
    metadata = graphs.get_graph_metadata(graph)
    assert metadata['num_nodes'] == 4
    assert metadata['num_edges'] == 6
    assert metadata['min_edge_weight'] == 1
    assert metadata['max_edge_weight'] == 6
    assert metadata['node_memory'] == 112
    assert metadata['edge_memory'] == 336
    assert metadata['total_memory'] == 448


def test_graph_update_batch():
    graph_obj = build_init_graph(token_graph=False)
    graphs.update_graph(graph_obj, batch=((4, 5), (5, 6)), weight_connection=8)
    metadata = graphs.get_graph_metadata(graph_obj)
    assert metadata['num_nodes'] == 6
    assert metadata['num_edges'] == 8
    assert metadata['min_edge_weight'] == 1
    assert metadata['max_edge_weight'] == 8


def test_graph_update_single_new():
    graph_obj = build_init_graph(token_graph=False)
    graphs.update_graph(graph_obj, parent=4, child=5, weight_connection=7)
    metadata = graphs.get_graph_metadata(graph_obj)
    assert metadata['num_nodes'] == 5
    assert metadata['num_edges'] == 7
    assert metadata['min_edge_weight'] == 1
    assert metadata['max_edge_weight'] == 7


def test_graph_update_single_existing():
    graph_obj = build_init_graph(token_graph=False)
    graphs.update_graph(graph_obj, parent=1, child=4, weight_connection=5)
    metadata = graphs.get_graph_metadata(graph_obj)
    assert metadata['num_nodes'] == 4
    assert metadata['num_edges'] == 6
    assert metadata['min_edge_weight'] == 1
    assert metadata['max_edge_weight'] == 10


@pytest.mark.parametrize('cast_int', [True, False])
def test_graph_undirected_conversion(graph, cast_int):
    graph_undir = graphs.convert_graph_to_undirected(graph, cast_int=cast_int)
    # edges: (1, 2, w=1) und (2, 1, w=6) --> undirected: (1, 2, w=7)
    assert graph_undir[1][2]['weight'] == pytest.approx(7.0)


def test_graph_cytoscape_conversion(graph):
    cyto_graph, weight_data = graphs.convert_graph_to_cytoscape(graph)
    node = cyto_graph[0]
    edge = cyto_graph[-1]
    assert node['data']['id'] == 1  # type: ignore
    assert edge['data']['source'] == 3  # type: ignore
    assert edge['data']['target'] == 4  # type: ignore
    assert edge['data']['weight'] == 4  # type: ignore
    assert weight_data['min'] == 1
    assert weight_data['max'] == 6


def test_tk_graph_properties(tk_graph):
    assert tk_graph.name == TK_GRAPH_NAME
    assert isinstance(tk_graph.directed, graphs.TokenGraph)
    assert isinstance(tk_graph.undirected, nx.Graph)
    tk_graph.update_metadata()
    metadata_directed = tk_graph.metadata_directed
    assert metadata_directed['num_nodes'] == 4
    assert metadata_directed['num_edges'] == 6
    assert metadata_directed['min_edge_weight'] == 1
    assert metadata_directed['max_edge_weight'] == 6
    assert metadata_directed['node_memory'] == 112
    assert metadata_directed['edge_memory'] == 336
    assert metadata_directed['total_memory'] == 448
    metadata_undirected = tk_graph.metadata_undirected
    assert metadata_undirected['num_nodes'] == 4
    assert metadata_undirected['num_edges'] == 5
    assert metadata_undirected['min_edge_weight'] == 2
    assert metadata_undirected['max_edge_weight'] == 7
    assert metadata_undirected['node_memory'] == 112
    assert metadata_undirected['edge_memory'] == 280
    assert metadata_undirected['total_memory'] == 392


def test_graph_degree_filter(tk_graph):
    filtered_graph = graphs.filter_graph_by_node_degree(
        tk_graph,
        bound_lower=3,
        bound_upper=3,
    )
    assert len(filtered_graph.nodes) == 2


def test_graph_edge_number_filter(tk_graph):
    number_edges_limit = 1
    filtered_graph = graphs.filter_graph_by_number_edges(
        tk_graph,
        limit=number_edges_limit,
    )
    assert len(filtered_graph.edges) == number_edges_limit
    filtered_graph = graphs.filter_graph_by_node_degree(
        filtered_graph,
        bound_lower=1,
        bound_upper=None,
    )
    assert len(filtered_graph.nodes) == 2, 'one edge should result in only two nodes'