import random as rand


def read_graph_from_file(path, separator=",", read_first_line=False, is_directed=False, has_weight=False):
    edges = dict()
    with open(path, 'r') as file:
        read_line = read_first_line
        line = file.readline()
        while line != '':
            if read_line:
                if line[0] != "#":
                    split = line.strip('\n').split(separator)
                    node1 = int(split[0])
                    node2 = int(split[1])
                    if not is_directed:
                        if node1 < node2:
                            node1, node2 = node2, node1
                        if not has_weight:
                            edges[(node1, node2)] = 1
                        else:
                            edges[(node1, node2)] = int(split[2])
            else:
                read_line = True
            line = file.readline()
    return edges


def add_weight_to_file(graph, path, extension, separator=",", weight_scale=(1, 100)):
    with open(path + "_with_weight" + extension, 'w') as file:
        for key in graph.keys():
            file.write(str(key[0]) + separator + str(key[1]) + separator + str(rand.randint(weight_scale[0],
                                                                                            weight_scale[1])) + "\n")