from networkx import from_pandas_edgelist
from pandas import DataFrame
from pyvis.network import Network

def pyvis_graph_from_pandas_DF(pandas_df:DataFrame, source_column:str="link1", target_column:str="link2", heading:str=None) -> Network:

    nx = from_pandas_edgelist(pandas_df, source=source_column, target=target_column)
    pyvis_net = Network(bgcolor="#222222", font_color="#fafafa", width="100%", height="95%")
    pyvis_net.from_nx(nx, default_node_size=8)

    if heading != None:
        pyvis_net.heading = heading + """
        <style>
        body {
            background-color: #222222;
        }
        h1 {
            font-size: 1.15rem;
            margin: .5rem;
            color: #fafafa;
            font-family: sans-serif;
        }
        #mynetwork {
            border: none !important;
        }
        </style>
        """

    pyvis_options = """
    var options = {
        "nodes": {
            "font": {
                "size": 12
            }
        },
        "edges": {
            "arrows": {
                "to": {
                    "enabled": true,
                    "scaleFactor": 0.3
                }
            },
            "color": {
                "inherit": true
            },
            "smooth": false
        },
        "interaction": {
            "hover": false
        },
        "physics": {
            "barnesHut": {
                "centralGravity": 0,
                "springLength": 200,
                "springConstant": 0.01,
                "avoidOverlap": 0
            },
            "minVelocity": 0.75
        }
    }
    """

    # pyvis_net.show_buttons()
    pyvis_net.set_options(pyvis_options)

    return pyvis_net