#!/usr/bin/env python
from subprocess import Popen, PIPE, STDOUT
import json
import sys

COLLECTOR_VERSION_KEY = "collector_version"
COLLECTOR_VERSION = 1


def get_bonjour_devices_num():
    device_num = 0
    services = set()

    cmd = '/usr/sbin/avahi-browse -t -a -l -p'
    process = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
    output = process.stdout.read()
    process.communicate()
    if process.returncode != 0:
        return device_num, services

    result = {}
    for line in output.split('\n'):
        # +;ovs_eth1;IPv4;dada-3614;_afpovertcp._tcp;local
        line = line.strip().split(';')
        if len(line) < 6:
            continue
        _, _, _, dev_name, service, _ = line
        if dev_name not in result:
            result[dev_name] = []
        result[dev_name].append(service)

    device_num = len(result)
    for servs in result.values():
        for serv in servs:
            services.add(serv)

    return device_num, services


def main():
    ''' Result output
    {
        COLLECTOR_VERSION_KEY: COLLECTOR_VERSION
        bonjour_device_num: int
        bonjour_services: []
    }
    '''
    result = {
        COLLECTOR_VERSION_KEY: COLLECTOR_VERSION,
        'bonjour_device_num': 0,
        'bonjour_services': []
    }
    result['bonjour_device_num'], result['bonjour_services'] = get_bonjour_devices_num()
    result['bonjour_services'] = list(result['bonjour_services'])

    sys.stdout.write(json.dumps(result))


if __name__ == '__main__':
    main()