# -*- coding: utf-8 -*-
#
import json

from rest_framework.views import Response, APIView
from ldap3 import Server, Connection
from django.core.mail import get_connection, send_mail
from django.utils.translation import ugettext_lazy as _
from django.conf import settings

from .permissions import IsOrgAdmin
from .serializers import MailTestSerializer, LDAPTestSerializer


class MailTestingAPI(APIView):
    permission_classes = (IsOrgAdmin,)
    serializer_class = MailTestSerializer
    success_message = _("Test mail sent to {}, please check")

    def post(self, request):
        serializer = self.serializer_class(data=request.data)
        if serializer.is_valid():
            email_host_user = serializer.validated_data["EMAIL_HOST_USER"]
            for k, v in serializer.validated_data.items():
                if k.startswith('EMAIL'):
                    setattr(settings, k, v)
            try:
                subject = "Test"
                message = "Test smtp setting"
                send_mail(subject, message,  email_host_user, [email_host_user])
            except Exception as e:
                return Response({"error": str(e)}, status=401)

            return Response({"msg": self.success_message.format(email_host_user)})
        else:
            return Response({"error": str(serializer.errors)}, status=401)


class LDAPTestingAPI(APIView):
    permission_classes = (IsOrgAdmin,)
    serializer_class = LDAPTestSerializer
    success_message = _("Test ldap success")

    def post(self, request):
        serializer = self.serializer_class(data=request.data)
        if serializer.is_valid():
            host = serializer.validated_data["AUTH_LDAP_SERVER_URI"]
            bind_dn = serializer.validated_data["AUTH_LDAP_BIND_DN"]
            password = serializer.validated_data["AUTH_LDAP_BIND_PASSWORD"]
            use_ssl = serializer.validated_data.get("AUTH_LDAP_START_TLS", False)
            search_ougroup = serializer.validated_data["AUTH_LDAP_SEARCH_OU"]
            search_filter = serializer.validated_data["AUTH_LDAP_SEARCH_FILTER"]
            attr_map = serializer.validated_data["AUTH_LDAP_USER_ATTR_MAP"]

            try:
                attr_map = json.loads(attr_map)
            except json.JSONDecodeError:
                return Response({"error": "AUTH_LDAP_USER_ATTR_MAP not valid"}, status=401)

            server = Server(host, use_ssl=use_ssl)
            conn = Connection(server, bind_dn, password)
            try:
                conn.bind()
            except Exception as e:
                return Response({"error": str(e)}, status=401)

            users = []
            for search_ou in str(search_ougroup).split("|"):
                ok = conn.search(search_ou, search_filter % ({"user": "*"}),
                                 attributes=list(attr_map.values()))
                if not ok:
                    return Response({"error": _("Search no entry matched in ou {}").format(search_ou)}, status=401)

                for entry in conn.entries:
                    user = {}
                    for attr, mapping in attr_map.items():
                        if hasattr(entry, mapping):
                            user[attr] = getattr(entry, mapping)
                    users.append(user)
            if len(users) > 0:
                return Response({"msg": _("Match {} s users").format(len(users))})
            else:
                return Response({"error": "Have user but attr mapping error"}, status=401)
        else:
            return Response({"error": str(serializer.errors)}, status=401)


class DjangoSettingsAPI(APIView):
    def get(self, request):
        if not settings.DEBUG:
            return Response("Not in debug mode")

        data = {}
        for k, v in settings.__dict__.items():
            if k and k.isupper():
                try:
                    json.dumps(v)
                    data[k] = v
                except (json.JSONDecodeError, TypeError):
                    data[k] = str(v)
        return Response(data)