# python-bugzilla - a Python interface to bugzilla using xmlrpclib.
#
# Copyright (C) 2007, 2008 Red Hat Inc.
# Author: Will Woods <wwoods@redhat.com>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.  See http://www.gnu.org/copyleft/gpl.html for
# the full text of the license.

from logging import getLogger
import sys

if hasattr(sys.version_info, "major") and sys.version_info.major >= 3:
    # pylint: disable=F0401
    from xmlrpc.client import Fault, ServerProxy
else:
    from xmlrpclib import Fault, ServerProxy

from .apiversion import version, __version__
from .base import BugzillaBase as _BugzillaBase
from .base import BugzillaError
from .base import RequestsTransport as _RequestsTransport
from .bugzilla3 import Bugzilla3, Bugzilla32, Bugzilla34, Bugzilla36
from .bugzilla4 import Bugzilla4, Bugzilla42, Bugzilla44
from .rhbugzilla import RHBugzilla, RHBugzilla3, RHBugzilla4

log = getLogger(__name__)


# Back compat for deleted NovellBugzilla
class NovellBugzilla(Bugzilla34):
    pass


def _getBugzillaClassForURL(url, sslverify):
    url = Bugzilla3.fix_url(url)
    log.debug("Detecting subclass for %s", url)
    s = ServerProxy(url, _RequestsTransport(url, sslverify=sslverify))
    rhbz = False
    bzversion = ''
    c = None

    if "bugzilla.redhat.com" in url:
        log.info("Using RHBugzilla for URL containing bugzilla.redhat.com")
        return RHBugzilla
    if "bugzilla.novell.com" in url:
        log.info("Using NovellBugzilla for URL containing bugzilla.novell.com")
        return NovellBugzilla
    if "bugzilla.mozilla.org" in url:
        log.info("Using Bugzilla42 for URL containing bugzilla.mozilla.org")
        return Bugzilla42

    # Check for a Red Hat extension
    try:
        log.debug("Checking for Red Hat Bugzilla extension")
        extensions = s.Bugzilla.extensions()
        if extensions.get('extensions', {}).get('RedHat', False):
            rhbz = True
    except Fault:
        pass
    log.debug("rhbz=%s", str(rhbz))

    # Try to get the bugzilla version string
    try:
        log.debug("Checking return value of Bugzilla.version()")
        r = s.Bugzilla.version()
        bzversion = r['version']
    except Fault:
        pass
    log.debug("bzversion='%s'", str(bzversion))

    # note preference order: RHBugzilla* wins if available
    if rhbz:
        c = RHBugzilla
    elif bzversion.startswith("4."):
        if bzversion.startswith("4.0"):
            c = Bugzilla4
        elif bzversion.startswith("4.2"):
            c = Bugzilla42
        else:
            log.debug("No explicit match for %s, using latest bz4", bzversion)
            c = Bugzilla44
    else:
        if bzversion.startswith('3.6'):
            c = Bugzilla36
        elif bzversion.startswith('3.4'):
            c = Bugzilla34
        elif bzversion.startswith('3.2'):
            c = Bugzilla32
        else:
            log.debug("No explicit match for %s, fall through", bzversion)
            c = Bugzilla3

    return c


class Bugzilla(_BugzillaBase):
    '''
    Magical Bugzilla class that figures out which Bugzilla implementation
    to use and uses that.
    '''
    def _init_class_from_url(self, url, sslverify):
        if url is None:
            raise TypeError("You must pass a valid bugzilla URL")

        c = _getBugzillaClassForURL(url, sslverify)
        if not c:
            raise ValueError("Couldn't determine Bugzilla version for %s" %
                             url)

        self.__class__ = c
        log.info("Chose subclass %s v%s", c.__name__, c.version)
        return True


# This is the list of possible Bugzilla instances an app can use,
# bin/bugzilla uses it for the --bztype field
classlist = [
    "Bugzilla3", "Bugzilla32", "Bugzilla34", "Bugzilla36",
    "Bugzilla4", "Bugzilla42", "Bugzilla44",
    "RHBugzilla3", "RHBugzilla4", "RHBugzilla",
    "NovellBugzilla",
]

# This is the public API. If you are explicitly instantiating any other
# class, using some function, or poking into internal files, don't complain
# if things break on you.
__all__ = classlist + [
    'BugzillaError',
    'Bugzilla',
]