import re
import types
import urllib
import logging
import requests
from hashlib import md5
from flask import request, url_for

import conf

logger = logging.getLogger(__name__)


def default_handler(obj, role='admin'):
    """JSON handler for default query formatting"""
    if hasattr(obj, 'isoformat'):
        return obj.isoformat()
    if hasattr(obj, 'dump'):
        return obj.dump(role=role)
    if isinstance(obj, (set, frozenset, types.GeneratorType)):
        return list(obj)
    if isinstance(obj, BaseException):
        return str(obj)
    raise TypeError("Object of type %s with value of %r "
                    "is not JSON serializable" % (type(obj), obj))


def try_keys(dico, *keys):
    for key in keys:
        if key in dico:
            return dico[key]
    return


def rebuild_url(url, base_split):
    split = urllib.parse.urlsplit(url)
    if split.scheme and split.netloc:
        return url  # url is fine
    new_split = urllib.parse.SplitResult(
            scheme=split.scheme or base_split.scheme,
            netloc=split.netloc or base_split.netloc,
            path=split.path, query='', fragment='')
    return urllib.parse.urlunsplit(new_split)


def try_get_icon_url(url, *splits):
    for split in splits:
        if split is None:
            continue
        rb_url = rebuild_url(url, split)
        response = None
        # if html in content-type, we assume it's a fancy 404 page
        try:
            response = jarr_get(rb_url)
            content_type = response.headers.get('content-type', '')
        except Exception:
            pass
        else:
            if response is not None and response.ok \
                    and 'html' not in content_type and response.content:
                return response.url
    return None


def to_hash(text):
    return md5(text.encode('utf8') if hasattr(text, 'encode') else text)\
            .hexdigest()


def clear_string(data):
    """
    Clear a string by removing HTML tags, HTML special caracters
    and consecutive white spaces (more that one).
    """
    p = re.compile('<[^>]+>')  # HTML tags
    q = re.compile('\s')  # consecutive white spaces
    return p.sub('', q.sub(' ', data))


def redirect_url(default='home'):
    return request.args.get('next') or request.referrer or url_for(default)


async def jarr_get(url, **kwargs):
    request_kwargs = {'verify': False, 'allow_redirects': True,
                      'timeout': conf.CRAWLER_TIMEOUT,
                      'headers': {'User-Agent': conf.CRAWLER_USER_AGENT}}
    request_kwargs.update(kwargs)
    return requests.get(url, **request_kwargs)