# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2010-2014 Vifib SARL and Contributors.
# All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation; either version 2.1
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
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##############################################################################

import ast
import hashlib
import json
import re
import requests
import sys

import prettytable

from slapos.grid import networkcache
from slapos.cli.config import ConfigCommand
from slapos.cli.list import resetLogger

class CacheLookupCommand(ConfigCommand):
    """
    perform a query to the networkcache
    You can provide either a complete URL to the software release,
    or a corresponding MD5 hash value.

    The command will report which OS distribution/version have a binary
    cache of the software release, and which ones are compatible
    with the OS you are currently running.
    """

    def get_parser(self, prog_name):
        ap = super(CacheLookupCommand, self).get_parser(prog_name)
        ap.add_argument('url',
                        help='Wanted url for testing')
        return ap

    def take_action(self, args):
        configp = self.fetch_config(args)
        cache_dir = configp.get('networkcache', 'download-binary-dir-url')
        sys.exit(do_lookup(self.app.log, cache_dir, args.url))

def do_lookup(logger, cache_dir, url):
    md5 = hashlib.md5(url).hexdigest()

    try:
        cached_url = '%s/slapos-buildout-%s' % (cache_dir, md5)
        logger.debug('Connecting to %s', url)
        req = requests.get(cached_url, timeout=5)
    except (requests.Timeout, requests.ConnectionError):
        logger.critical('Cannot connect to cache server at %s', cached_url)
        return 10

    if not req.ok:
        if req.status_code == 404:
            logger.critical('Object not in cache: %s', url)
        else:
            logger.critical('Error while looking object %s: %s', url, req.reason)
        return 10

    entries = req.json()

    if not entries:
        logger.info('Object found in cache, but has no entries.')
        return 0

    pt = prettytable.PrettyTable(['file', 'sha512'])
    entry_list = sorted(json.loads(entry[0]) for entry in entries)
    for entry in entry_list:
        pt.add_row([entry["file"], entry["sha512"]])

    meta = json.loads(entries[0][0])
    logger.info('Software source URL: %s', url)
    logger.info('SHADIR URL: %s', cached_url)

    resetLogger(logger)
    for line in pt.get_string(border=True, padding_width=0, vrules=prettytable.NONE).split('\n'):
        logger.info(line)
    return 0
