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

# Copyright 2010 - 2017 RhodeCode GmbH and the AppEnlight project authors
#
# 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.

"""
Helper functions
"""
import copy
import datetime

from collections import namedtuple, OrderedDict

_ = lambda x: x

time_deltas = OrderedDict()

time_deltas['1m'] = {'delta': datetime.timedelta(minutes=1),
                     'label': '1 minute', 'minutes': 1}

time_deltas['5m'] = {'delta': datetime.timedelta(minutes=5),
                     'label': '5 minutes', 'minutes': 5}
time_deltas['30m'] = {'delta': datetime.timedelta(minutes=30),
                      'label': '30 minutes', 'minutes': 30}
time_deltas['1h'] = {'delta': datetime.timedelta(hours=1),
                     'label': '60 minutes', 'minutes': 60}
time_deltas['4h'] = {'delta': datetime.timedelta(hours=4), 'label': '4 hours',
                     'minutes': 60 * 4}
time_deltas['12h'] = {'delta': datetime.timedelta(hours=12),
                      'label': '12 hours', 'minutes': 60 * 12}
time_deltas['24h'] = {'delta': datetime.timedelta(hours=24),
                      'label': '24 hours', 'minutes': 60 * 24}
time_deltas['3d'] = {'delta': datetime.timedelta(days=3), 'label': '3 days',
                     'minutes': 60 * 24 * 3}
time_deltas['1w'] = {'delta': datetime.timedelta(days=7), 'label': '7 days',
                     'minutes': 60 * 24 * 7}
time_deltas['2w'] = {'delta': datetime.timedelta(days=14), 'label': '14 days',
                     'minutes': 60 * 24 * 14}
time_deltas['1M'] = {'delta': datetime.timedelta(days=31), 'label': '31 days',
                     'minutes': 60 * 24 * 31}
time_deltas['3M'] = {'delta': datetime.timedelta(days=31 * 3),
                     'label': '3 months',
                     'minutes': 60 * 24 * 31 * 3}
time_deltas['6M'] = {'delta': datetime.timedelta(days=31 * 6),
                     'label': '6 months',
                     'minutes': 60 * 24 * 31 * 6}
time_deltas['12M'] = {'delta': datetime.timedelta(days=31 * 12),
                      'label': '12 months',
                      'minutes': 60 * 24 * 31 * 12}

# used in json representation
time_options = dict([(k, {'label': v['label'], 'minutes': v['minutes']})
                     for k, v in time_deltas.items()])
FlashMsg = namedtuple('FlashMsg', ['msg', 'level'])


def get_flash(request):
    messages = []
    messages.extend(
        [FlashMsg(msg, 'error')
         for msg in request.session.peek_flash('error')])
    messages.extend([FlashMsg(msg, 'warning')
                     for msg in request.session.peek_flash('warning')])
    messages.extend(
        [FlashMsg(msg, 'notice') for msg in request.session.peek_flash()])
    return messages


def clear_flash(request):
    request.session.pop_flash('error')
    request.session.pop_flash('warning')
    request.session.pop_flash()


def get_type_formatted_flash(request):
    return [{'msg': message.msg, 'type': message.level}
            for message in get_flash(request)]


def gen_pagination_headers(request, paginator):
    headers = {
        'x-total-count': str(paginator.item_count),
        'x-current-page': str(paginator.page),
        'x-items-per-page': str(paginator.items_per_page)
    }
    params_dict = request.GET.dict_of_lists()
    last_page_params = copy.deepcopy(params_dict)
    last_page_params['page'] = paginator.last_page or 1
    first_page_params = copy.deepcopy(params_dict)
    first_page_params.pop('page', None)
    next_page_params = copy.deepcopy(params_dict)
    next_page_params['page'] = paginator.next_page or paginator.last_page or 1
    prev_page_params = copy.deepcopy(params_dict)
    prev_page_params['page'] = paginator.previous_page or 1
    lp_url = request.current_route_url(_query=last_page_params)
    fp_url = request.current_route_url(_query=first_page_params)
    links = [
        'rel="last", <{}>'.format(lp_url),
        'rel="first", <{}>'.format(fp_url),
    ]
    if first_page_params != prev_page_params:
        prev_url = request.current_route_url(_query=prev_page_params)
        links.append('rel="prev", <{}>'.format(prev_url))
    if last_page_params != next_page_params:
        next_url = request.current_route_url(_query=next_page_params)
        links.append('rel="next", <{}>'.format(next_url))
    headers['link'] = '; '.join(links)
    return headers