# -*- coding: utf-8 -*-

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

import prettytable
from slapos.grid import networkcache
from slapos.grid.distribution import patched_linux_distribution


def looks_like_md5(s):
    """
    Return True if the parameter looks like an hashed value.
    Not 100% precise, but we're actually more interested in filtering out URLs and pathnames.
    """
    return re.match('[0-9a-f]{32}', s)


def do_lookup(configp, software_url, logger):
    cache_dir = configp.get('networkcache', 'download-binary-dir-url')

    if looks_like_md5(software_url):
        md5 = software_url
    else:
        md5 = hashlib.md5(software_url).hexdigest()

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

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

    entries = req.json()

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

    ostable = sorted(ast.literal_eval(json.loads(entry[0])['os']) for entry in entries)

    pt = prettytable.PrettyTable(['distribution', 'version', 'id', 'compatible?'])

    linux_distribution = patched_linux_distribution()

    for os in ostable:
        compatible = 'yes' if networkcache.os_matches(os, linux_distribution) else 'no'
        pt.add_row([os[0], os[1], os[2], compatible])

    meta = json.loads(entries[0][0])
    logger.info('Software URL: %s', meta['software_url'])
    logger.info('MD5:          %s', md5)

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