#!/usr/bin/python

from __future__ import print_function
from copy import deepcopy
import io
import json
import socket
import subprocess
import time

import string
import StringIO

class BatmanParser:
	batadv_vis = 'batadv-vis'
	mactranslation = string.maketrans('2367abef', '014589cd')

	def __str__(self):
		return 'BatmanParser \'{0}\''.format(self.batadv_vis)

	def sanitycheck(self):
		"""Checks that batadv-vis is executable and gives sane output."""

		testdata = None
		try:
			testdata = subprocess.check_output([self.batadv_vis, '-f', 'jsondoc'])
		except Exception as err:
			raise Exception("batadv-vis not found or incompatible: " + str(err))

		try:
			check = json.loads(testdata)
		except Exception as err:
			raise Exception("batadv-vis does not return valid JSON data: " + str(err))

		return True

	def mac2id(self, mac):
		"""Derives a nodeid from the given MAC address."""

		temp = str(mac.lower().replace(':', ''))
#		temp = temp[0] + temp[1].translate(self.mactranslation) + temp[2:]
		return temp

	def fetch(self, batadv_dump=None, include_rawdata=False):
		"""Fetches the current data from batadv-vis and returns it."""

		data = { }
		ts = int(time.time())

		# call batadv-vis and parse output as JSON
		rawdata = subprocess.check_output([self.batadv_vis, '-f', 'jsondoc'])
		batmandata = json.loads(rawdata)

		# dump raw data into file if requested
		if not batadv_dump is None:
			jsondata = json.dumps(batmandata, ensure_ascii=False)
			f = io.open(batadv_dump, 'w')
			f.write(rawdata)
			f.close()

		# parse raw data, convert all MAC into nodeid
		for item in batmandata['vis']:
			itemid = self.mac2id(item['primary'])
			aliases = []
			if 'secondary' in item:
				for mac in item['secondary']:
					aliases.append(self.mac2id(mac))

			neighbours = {}
			if 'neighbors' in item:
				for neighbour in item['neighbors']:
					#if neighbour['router'] != item['primary']:
					#	print('node {0}\'s neighbor {1} has unexpected router {2}'.format(itemid, neighbour['neighbor'], neighbour['router']))
					neighbours[neighbour['neighbor']] = float(neighbour['metric'])

			# construct dict entry as expected by BATCAVE
			data[itemid] = {
				'aliases': aliases,
				'neighbours': neighbours,
				'clients': [ x for x in item['clients'] ] if 'clients' in item else [],
				'__UPDATED__': { 'batadv': ts, },
				'__RAW__': { 'batadv': { itemid: item, } },
			}

		return data

# standalone test mode
if __name__ == "__main__":
	b = BatmanParser()
	try:
		b.sanitycheck()
	except Exception  as err:
		print('SANITY-CHECK failed:', str(err))
		import sys
		sys.exit(1)
	data = b.fetch()
	print(json.dumps(data))