# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals

import datetime
import json
import os
import pickle
import pytz
import requests
import time
import urllib
import yaml

# Per election constants

SERIES_NAME = 'ocata'
# 2015-09-05 00:00:00 +0000
PERIOD_START = datetime.datetime(2015, 9, 5, 0, 0, 0, tzinfo=pytz.utc)
# 2016-09-04 23:59:59 +0000
PERIOD_END = datetime.datetime(2016, 9, 4, 23, 59, 59, tzinfo=pytz.utc)
PROJECTS_TAG = 'sept-2016-elections'

# Library constants
CANDIDATE_PATH = 'candidates'
GERRIT_BASE = 'https://review.openstack.org'
ELECTION_REPO = 'openstack/election'
BASE_URL = 'https://git.openstack.org/cgit'
PROJECTS_URL = ('%s/openstack/governance/plain/reference/projects.yaml' %
                (BASE_URL))


# Gerrit functions
def gerrit_datetime(dt):
    return dt.strftime('%Y-%m-%d %H:%M:%S %z')


def gerrit_query(url):
    r = requests.get(url)
    if r.status_code == 200:
        data = json.loads(r.text[4:])
    else:
        data = []
    return data


def get_reviews(query):
    opts = ['CURRENT_REVISION', 'CURRENT_FILES', 'DETAILED_ACCOUNTS']
    opts_str = '&o=%s' % ('&o='.join(opts))
    url = ('%s/changes/?q=%s%s' %
           (GERRIT_BASE, urllib.quote_plus(query, safe='/:=><^.*'), opts_str))
    return gerrit_query(url)


def candidate_files(review):
    return list(filter(lambda x: x.startswith(CANDIDATE_PATH),
                       list(review['revisions'].values())[0]['files'].keys()))


# Governance functions
def check_atc_date(atc):
    if 'expires-in' not in atc:
        return False
    expires_in = datetime.datetime.strptime(atc['expires-in'], '%B %Y')
    expires_in = expires_in.replace(tzinfo=pytz.utc)
    return PERIOD_END < expires_in


def get_projects(tag=None):
    url = PROJECTS_URL
    cache_file = '.projects.pkl'

    if tag:
        url += '?%s' % tag
        cache_file = '.projects.%s.pkl' % tag

    # Refresh the cache if it's not there or if it's older than a week
    if (not os.path.isfile(cache_file) or
            os.stat(cache_file).st_size < 100 or
            os.stat(cache_file).st_mtime + (7*24*3600) < time.time()):
        print("[+] Updating %s" % (cache_file))
        data = yaml.safe_load(urllib.urlopen(url).read())
        pickle.dump(data, open(cache_file, "w"))

    return pickle.load(open(cache_file))


# Election functions
def name2dir(name):
    """Convert project name to directory name: only [a-zA-Z_] in camelcase"""
    name = name.replace(' ', '_').replace('-', '_')
    return "_".join(map(lambda x: x[0].upper()+x[1:], name.split('_')))


def dir2name(name, projects):
    """Convert directory name to original project name"""
    name = name.replace('_', '').lower()
    for project_name in projects:
        pname = project_name.lower().replace(' ', '').replace('-', '').lower()
        if name == pname:
            return project_name
    raise ValueError(('%s does not match any project' % (name)))