from urllib.parse import urlencode

from django.conf import settings
from django.db.utils import IntegrityError
from django.http.request import HttpRequest
from django.http.response import HttpResponseRedirect
from django.utils.translation import ugettext_lazy as _
from django.views import View
from rest_framework.exceptions import APIException
from rest_framework.permissions import AllowAny, IsAuthenticated

from authentication.const import ConfirmType
from authentication.mixins import AuthMixin
from authentication.notifications import OAuthBindMessage
from common.views.mixins import PermissionsMixin, UserConfirmRequiredExceptionMixin
from common.permissions import UserConfirmation
from common.sdk.im.feishu import URL, FeiShu
from common.utils import FlashMessageUtil, get_logger
from common.utils.common import get_request_ip
from common.utils.django import reverse
from common.utils.random import random_string
from users.views import UserVerifyPasswordView

from .mixins import QRLoginCallbackMixin

logger = get_logger(__file__)

FEISHU_STATE_SESSION_KEY = '_feishu_state'


class FeiShuQRMixin(UserConfirmRequiredExceptionMixin, PermissionsMixin, View):
    def dispatch(self, request, *args, **kwargs):
        try:
            return super().dispatch(request, *args, **kwargs)
        except APIException as e:
            msg = str(e.detail)
            return self.get_failed_response(
                '/',
                _('FeiShu Error'),
                msg
            )

    def verify_state(self):
        state = self.request.GET.get('state')
        session_state = self.request.session.get(FEISHU_STATE_SESSION_KEY)
        if state != session_state:
            return False
        return True

    def get_verify_state_failed_response(self, redirect_uri):
        msg = _("The system configuration is incorrect. Please contact your administrator")
        return self.get_failed_response(redirect_uri, msg, msg)

    def get_qr_url(self, redirect_uri):
        state = random_string(16)
        self.request.session[FEISHU_STATE_SESSION_KEY] = state

        params = {
            'app_id': settings.FEISHU_APP_ID,
            'state': state,
            'redirect_uri': redirect_uri,
        }
        url = URL().authen + '?' + urlencode(params)
        return url

    @staticmethod
    def get_success_response(redirect_url, title, msg):
        message_data = {
            'title': title,
            'message': msg,
            'interval': 5,
            'redirect_url': redirect_url,
        }
        return FlashMessageUtil.gen_and_redirect_to(message_data)

    @staticmethod
    def get_failed_response(redirect_url, title, msg):
        message_data = {
            'title': title,
            'error': msg,
            'interval': 5,
            'redirect_url': redirect_url,
        }
        return FlashMessageUtil.gen_and_redirect_to(message_data)

    def get_already_bound_response(self, redirect_url):
        msg = _('FeiShu is already bound')
        response = self.get_failed_response(redirect_url, msg, msg)
        return response


class FeiShuQRBindView(FeiShuQRMixin, View):
    permission_classes = (IsAuthenticated, UserConfirmation.require(ConfirmType.ReLogin))

    def get(self, request: HttpRequest):
        user = request.user
        redirect_url = request.GET.get('redirect_url')

        redirect_uri = reverse('authentication:feishu-qr-bind-callback', external=True)
        redirect_uri += '?' + urlencode({'redirect_url': redirect_url})

        url = self.get_qr_url(redirect_uri)
        return HttpResponseRedirect(url)


class FeiShuQRBindCallbackView(FeiShuQRMixin, View):
    permission_classes = (IsAuthenticated,)

    def get(self, request: HttpRequest):
        code = request.GET.get('code')
        redirect_url = request.GET.get('redirect_url')

        if not self.verify_state():
            return self.get_verify_state_failed_response(redirect_url)

        user = request.user

        if user.feishu_id:
            response = self.get_already_bound_response(redirect_url)
            return response

        feishu = FeiShu(
            app_id=settings.FEISHU_APP_ID,
            app_secret=settings.FEISHU_APP_SECRET
        )
        user_id, __ = feishu.get_user_id_by_code(code)

        if not user_id:
            msg = _('FeiShu query user failed')
            response = self.get_failed_response(redirect_url, msg, msg)
            return response

        try:
            user.feishu_id = user_id
            user.save()
        except IntegrityError as e:
            if e.args[0] == 1062:
                msg = _('The FeiShu is already bound to another user')
                response = self.get_failed_response(redirect_url, msg, msg)
                return response
            raise e

        ip = get_request_ip(request)
        OAuthBindMessage(user, ip, _('FeiShu'), user_id).publish_async()
        msg = _('Binding FeiShu successfully')
        response = self.get_success_response(redirect_url, msg, msg)
        return response


class FeiShuEnableStartView(UserVerifyPasswordView):

    def get_success_url(self):
        referer = self.request.META.get('HTTP_REFERER')
        redirect_url = self.request.GET.get("redirect_url")

        success_url = reverse('authentication:feishu-qr-bind')

        success_url += '?' + urlencode({
            'redirect_url': redirect_url or referer
        })

        return success_url


class FeiShuQRLoginView(FeiShuQRMixin, View):
    permission_classes = (AllowAny,)

    def get(self, request: HttpRequest):
        redirect_url = request.GET.get('redirect_url') or reverse('index')
        redirect_uri = reverse('authentication:feishu-qr-login-callback', external=True)
        redirect_uri += '?' + urlencode({
            'redirect_url': redirect_url,
        })

        url = self.get_qr_url(redirect_uri)
        return HttpResponseRedirect(url)


class FeiShuQRLoginCallbackView(QRLoginCallbackMixin, AuthMixin, FeiShuQRMixin, View):
    permission_classes = (AllowAny,)

    CLIENT_INFO = (
        FeiShu, {'app_id': 'FEISHU_APP_ID', 'app_secret': 'FEISHU_APP_SECRET'}
    )
    USER_TYPE = 'feishu'
    AUTH_BACKEND = 'AUTH_BACKEND_FEISHU'
    CREATE_USER_IF_NOT_EXIST = 'FEISHU_CREATE_USER_IF_NOT_EXIST'

    MSG_CLIENT_ERR = _('FeiShu Error')
    MSG_USER_NOT_BOUND_ERR = _('FeiShu is not bound')
    MSG_USER_NEED_BOUND_WARNING = _('Please login with a password and then bind the FeiShu')
    MSG_NOT_FOUND_USER_FROM_CLIENT_ERR = _('Failed to get user from FeiShu')