#
#   Copyright 2018 CNIT - Consorzio Nazionale Interuniversitario per le Telecomunicazioni
#
#   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  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 django.shortcuts import render, redirect
from sf_t3d.decorators import login_required
from django.http import HttpResponse
import json
from lib.osm.osmclient.clientv2 import Client
import authosm.utils as osmutils
import yaml
import logging

logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger('vimhandler.py')


@login_required
def list(request):
    user = osmutils.get_user(request)
    project_id = user.project_id
    result = {'type': 'ns', 'project_id': project_id}
    raw_content_types = request.META.get('HTTP_ACCEPT', '*/*').split(',')
    if 'application/json' not in raw_content_types:
        return __response_handler(request, result, 'vim_list.html')
    client = Client()
    result_client = client.vim_list(user.get_token())
    result["datacenters"] = result_client['data'] if result_client and result_client['error'] is False else []
    return __response_handler(request, result, 'vim_list.html')


@login_required
def create(request):
    user = osmutils.get_user(request)
    project_id = user.project_id
    result = {'project_id': project_id}
    if request.method == 'GET':
        return __response_handler(request, result, 'vim_create.html')
    else:
        try:
            new_vim_dict = request.POST.dict()
            client = Client()
            keys = ["schema_version",
                    "schema_type",
                    "name",
                    "vim_url",
                    "vim_type",
                    "vim_user",
                    "vim_password",
                    "vim_tenant_name",
                    "description"]
            vim_data = dict(filter(lambda i: i[0] in keys and len(
                i[1]) > 0, new_vim_dict.items()))
            vim_data['config'] = {}

            config_file = request.FILES.get('config_file')

            if config_file is not None:
                config = ''
                for line in config_file:
                    config = config + line.decode()
                vim_data['config'] = yaml.load(config)
            elif 'config' in request.POST and request.POST.get('config') != '':
                vim_data['config'] = yaml.load(request.POST.get('config'))


        except Exception as e:
            return __response_handler(request, {'status': 400, 'code': 'BAD_REQUEST', 'detail': e.message}, url=None, status=400)
        result = client.vim_create(user.get_token(), vim_data)

        if result['error']:
            return __response_handler(request, result['data'], url=None,
                                      status=result['data']['status'] if 'status' in result['data'] else 500)
        else:
            return __response_handler(request, {}, url=None, status=200)


@login_required
def delete(request, vim_id=None):
    user = osmutils.get_user(request)
    try:
        client = Client()
        del_res = client.vim_delete(user.get_token(), vim_id)
    except Exception as e:
        log.exception(e)
    return __response_handler(request, del_res, 'vims:list', to_redirect=True)


@login_required
def show(request, vim_id=None):
    user = osmutils.get_user(request)
    project_id = user.project_id
    client = Client()
    result = client.vim_get(user.get_token(), vim_id)
    if isinstance(result, dict) and 'error' in result and result['error']:
        return render(request, 'error.html')

    return __response_handler(request, {
        "datacenter": result['data'],
        "project_id": project_id
    }, 'vim_show.html')


def __response_handler(request, data_res, url=None, to_redirect=None, *args, **kwargs):
    raw_content_types = request.META.get('HTTP_ACCEPT', '*/*').split(',')
    if 'application/json' in raw_content_types or url is None:
        return HttpResponse(json.dumps(data_res), content_type="application/json", *args, **kwargs)
    elif to_redirect:
        return redirect(url, *args, **kwargs)
    else:
        return render(request, url, data_res)