#!/usr/bin/env python3
import subprocess
import json
import re

class batman:
  """ Bindings for B.A.T.M.A.N. advanced batctl tool
  """
  def __init__(self, mesh_interface = "bat0"):
    self.mesh_interface = mesh_interface

  def vis_data(self,batadv_vis=False):
    vds = self.vis_data_batctl_legacy()
    if batadv_vis:
        vds += self.vis_data_batadv_vis()
    return vds

  def vis_data_helper(self,lines):
    vd = []
    for line in lines:
      try:
        utf8_line = line.decode("utf-8")
        vd.append(json.loads(utf8_line))
      except e:
        pass
    return vd

  def vis_data_batctl_legacy(self):
    """ Parse "batctl -m <mesh_interface> vd json -n" into an array of dictionaries.
    """
    output = subprocess.check_output(["batctl","-m",self.mesh_interface,"vd","json","-n"])
    lines = output.splitlines()
    vds = self.vis_data_helper(lines)
    for vd in vds:
      vd['legacy'] = True
    return vds

  def vis_data_batadv_vis(self):
    """ Parse "batadv-vis -i <mesh_interface> -f json" into an array of dictionaries.
    """
    output = subprocess.check_output(["batadv-vis","-i",self.mesh_interface,"-f","json"])
    lines = output.splitlines()
    return self.vis_data_helper(lines)

  def gateway_list(self):
    """ Parse "batctl -m <mesh_interface> gwl -n" into an array of dictionaries.
    """
    output = subprocess.check_output(["batctl","-m",self.mesh_interface,"gwl","-n"])
    output_utf8 = output.decode("utf-8")
    # TODO Parse information
    lines = output_utf8.splitlines()
    own_mac = re.match(r"^.*MainIF/MAC: [^/]+/([0-9a-f:]+).*$",lines[0]).group(1)
    # Remove header line
    del lines[0]
    # Fill gateway list
    gw = []
    gw_mode = self.gateway_mode()
    if gw_mode['mode'] == 'server':
      gw.append({'mac': own_mac, 'bandwidth': gw_mode['bandwidth']})
    for line in lines:
      gw_line = line.split()
      # When in client gateway mode maybe gw_line[0] is not the right.
      gw.append({'mac':gw_line[0], 'bandwidth': gw_line[-1]})
    return gw

  def gateway_mode(self):
    """ Parse "batctl -m <mesh_interface> gw"
    """
    output = subprocess.check_output(["batctl","-m",self.mesh_interface,"gw"])
    elements = output.decode("utf-8").split()
    mode = elements[0]
    if mode == "server":
        return {'mode': 'server', 'bandwidth': elements[3]}
    else:
        return {'mode': mode}

if __name__ == "__main__":
  bc = batman()
  vd = bc.vis_data()
  gw = bc.gateway_list()
  for x in vd:
    print(x)
  print(gw)
  print(bc.gateway_mode())