# rhbug.py

# rhbug Sphinx extension.

#

# Copyright (C) 2012-2016 Red Hat, Inc.

#

# This copyrighted material is made available to anyone wishing to use,

# modify, copy, or redistribute it subject to the terms and conditions of

# the GNU General Public License v.2, or (at your option) any later version.

# This program is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY expressed or implied, including the implied warranties of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

# Public License for more details.  You should have received a copy of the

# GNU General Public License along with this program; if not, write to the

# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the

# source code or documentation are not subject to the GNU General Public

# License and may only be used or replicated with the express permission of

# Red Hat, Inc.

#

from docutils import nodes

try:

    import bugzilla

except ImportError:

    bugzilla = None

import json

import os

class Summary(object):

    def __init__(self, cache_fn):

        self.cache_fn = cache_fn

    def __call__(self, bug_id):

        bug_id = int(bug_id)

        summary = self._from_cache(bug_id)

        if summary is not None:

            return summary

        summary = self._from_bugzilla(bug_id)

        self._store_in_cache(bug_id, summary)

        return summary

    def _from_bugzilla(self, bug_id):

        if bugzilla is None:

            return ''

        rhbz = bugzilla.RHBugzilla(url="https://bugzilla.redhat.com/xmlrpc.cgi")

        query = rhbz.build_query(bug_id=bug_id)

        bug = rhbz.query(query)[0]

        return bug.summary

    def _from_cache(self, bug_id):

        try:

            with open(self.cache_fn, 'r') as json_file:

                cache = json.load(json_file)

                summary = [entry[1] for entry in cache if entry[0] == bug_id]

                return summary[0]

        except (IOError, IndexError):

            return None

    def _store_in_cache(self, bug_id, summary):

        if bugzilla is None:

            return

        try:

            with open(self.cache_fn, 'r') as json_file:

                cache = json.load(json_file)

        except IOError:

            cache = []

        cache.append((bug_id, summary))

        with open(self.cache_fn, 'w') as json_file:

            json.dump(cache, json_file, indent=4)

def RhBug_role(role, rawtext, text, lineno, inliner, options={}, content=[]):

    source = inliner.document.settings._source

    summaries_fn = '%s/summaries_cache' % os.path.dirname(source)

    summary = Summary(summaries_fn)(text)

    link_name = 'Bug %s - %s' % (text, summary)

    url = 'https://bugzilla.redhat.com/show_bug.cgi?id=%s' % text

    node = nodes.reference(rawtext, link_name, refuri=url)

    return [node], []

def setup(app):

    app.add_role('rhbug', RhBug_role)