#!/usr/bin/python
# -*- coding: utf-8 -*-

from __future__ import print_function
import io
import json
import string
import subprocess
import time

import ffstatus
from .exceptions import SanityCheckError


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:
            cmd = [self.batadv_vis, '-f', 'jsondoc']
            testdata = subprocess.check_output(cmd)
        except Exception as err:
            raise SanityCheckError(
                self, "batadv-vis not found or incompatible", err)

        try:
            json.loads(testdata)
        except Exception as err:
            raise SanityCheckError(
                self, "batadv-vis does not return valid JSON data", err)

        return True

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

        data = {}
        timestamp = 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 batadv_dump is not None:
            dumpfile = io.open(batadv_dump, 'w')
            dumpfile.write(rawdata)
            dumpfile.close()

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

                    metric = float(neighbour['metric'])
                    neighbours[neighbour['neighbor']] = metric

            # construct dict entry as expected by BATCAVE
            data[itemid] = {
                'aliases': aliases,
                'neighbours': neighbours,
                'clients': [x for x in item.get('clients', [])],
                '__UPDATED__': {'batadv': timestamp},
                '__RAW__': {'batadv': {itemid: item}},
            }

        return data

# standalone test mode
if __name__ == "__main__":
    parser = BatmanParser()

    try:
        parser.sanitycheck()
    except SanityCheckError as err:
        print('SANITY-CHECK failed:', str(err))
        import sys
        sys.exit(1)

    bdata = parser.fetch()
    print(json.dumps(bdata))