#!/usr/bin/python

import pygraphviz as pgv
import json
import argparse

def parse_args():
    parser = argparse.ArgumentParser(description='Generate graphs of polyamorous family networks from data files')
    parser.add_argument('--input', '-i', default='network.json', help='Input file in json format')
    parser.add_argument('--output', '-o', default='network.png', help='Output image file. Format auto-detected from file extension')
    parser.add_argument('--color', '-c', action='store_true', help='Include node colors in output graph')
    return parser.parse_args()


def main():
    settings = parse_args()

    try:
        data = json.load(open(settings.input, 'r'))
    except Exception as e:
        print "Error parsing data file: " + str(e)
        return

    graph = pgv.AGraph()
    graph.graph_attr['overlap'] = 'prism'
    graph.node_attr['style'] = 'filled'
    graph.edge_attr['arrowsize'] = 0.5

    # Add nodes to graph
    for user in data['members']:
        node_color = 'white'
        if settings.color and user.has_key('color'):
            node_color = user['color']

        graph.add_node(user['name'], fillcolor=node_color)

    # Add edges to graph
    edge_style = 'solid'

    for (member1,member2,edge) in data['relationships']:
        edge_style = edge
        graph.add_edge(member1, member2, style=edge_style, color='black')

    graph.layout()
    graph.draw(settings.output)
    

if __name__ == '__main__': main()