#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2017-2018 Wind River Systems, Inc.
#
# 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.

import logging
import json
import uuid

from django.conf import settings
from common.utils.restcall import _call_req

logger = logging.getLogger(__name__)

### build backlog with domain:"fault", type:"vm"

def buildBacklog_fault_vm(vimid, backlog_input):

    logger.info("vimid: %s" % vimid)
    logger.debug("with input: %s" % backlog_input)

    try:

        #must resolve the tenant id and server id while building the backlog
        tenant_id = backlog_input.get("tenantid", None)
        server_id = backlog_input.get("sourceid", None)

        # should resolve the name to id later
        if tenant_id is None:
            tenant_name = backlog_input["tenant"]
            server_name = backlog_input["source"]

            if tenant_name is None or server_name is None:
                logger.warn("tenant and source should be provided as backlog config")
                return None

            # get token
            # resolve tenant_name to tenant_id
            auth_api_url_format = "/{f_vim_id}/identity/v2.0/tokens"
            auth_api_url = auth_api_url_format.format(f_vim_id=vimid)
            auth_api_data = { "auth":{"tenantName": tenant_name} }
            base_url = settings.MULTICLOUD_PREFIX
            extra_headers = ''
            ret = _call_req(base_url, "", "", 0, auth_api_url, "POST", extra_headers, json.dumps(auth_api_data))
            if ret[0] > 0 or ret[1] is None:
                logger.critical("call url %s failed with status %s" % (auth_api_url, ret[0]))
                return None

            token_resp = json.JSONDecoder().decode(ret[1])
            token = token_resp["access"]["token"]["id"]
            tenant_id = token_resp["access"]["token"]["tenant"]["id"]

            if server_id is None:
                # resolve server_name to server_id
                vserver_api_url_format \
                    = "/{f_vim_id}/compute/v2.1/{f_tenant_id}/servers?name={f_server_name}"
                vserver_api_url = vserver_api_url_format.format(f_vim_id=vimid,
                                                                f_tenant_id=tenant_id,
                                                                f_server_name=server_name)
                base_url = settings.MULTICLOUD_PREFIX
                extra_headers = {'X-Auth-Token': token}
                ret = _call_req(base_url, "", "", 0, vserver_api_url, "GET", extra_headers, "")
                if ret[0] > 0 or ret[1] is None:
                    logger.critical("call url %s failed with status %s" % (vserver_api_url, ret[0]))
                    return None

                server_resp = json.JSONDecoder().decode(ret[1])
                # find out the server wanted
                for s in server_resp.get("servers", []):
                    if s["name"] == server_name:
                        server_id = s["id"]
                        break
                if server_id is None:
                    logger.warn("source %s cannot be found under tenant id %s "
                                % (server_name, tenant_id))
                    return None

        #m.c. proxied OpenStack API
        api_url_fmt = "/{f_vim_id}/compute/v2.1/{f_tenant_id}/servers/{f_server_id}"
        api_url = api_url_fmt.format(
                        f_vim_id=vimid, f_tenant_id=tenant_id, f_server_id=server_id)

        backlog = {
            "backlog_uuid":str(uuid.uuid3(uuid.NAMESPACE_URL,
                                          str("%s-%s-%s"%(vimid, tenant_id,server_id)))),
            "tenant_id": tenant_id,
            "server_id": server_id,
            "api_method": "GET",
            "api_link": api_url,
        }
        backlog.update(backlog_input)
    except Exception as e:
        logger.error("exception:%s" % str(e))
        return None

    logger.info("return")
    logger.debug("with backlog: %s" % backlog)
    return backlog