from urllib.parse import urlencode

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

from authentication import errors
from authentication.const import ConfirmType
from authentication.mixins import AuthMixin
from authentication.permissions import UserConfirmation
from authentication.decorators import post_save_next_to_session_if_guard_redirect, pre_save_next_to_session
from common.sdk.im.wecom import URL
from common.sdk.im.wecom import WeCom, wecom_tool
from common.utils import get_logger
from common.utils.django import reverse, get_object_or_none, safe_next_url
from common.views.mixins import UserConfirmRequiredExceptionMixin, PermissionsMixin
from users.models import User
from users.views import UserVerifyPasswordView
from .base import BaseLoginCallbackView, BaseBindCallbackView
from .mixins import FlashMessageMixin

logger = get_logger(__file__)


class WeComBaseMixin(UserConfirmRequiredExceptionMixin, PermissionsMixin, FlashMessageMixin, View):
    def dispatch(self, request, *args, **kwargs):
        try:
            return super().dispatch(request, *args, **kwargs)
        except APIException as e:
            try:
                msg = e.detail['errmsg']
            except Exception:
                msg = _('WeCom Error, Please contact your system administrator')
            return self.get_failed_response(
                '/',
                _('WeCom Error'),
                msg
            )

    def verify_state(self):
        return wecom_tool.check_state(self.request.GET.get('state'), self.request)

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


class WeComQRMixin(WeComBaseMixin, View):

    def get_qr_url(self, redirect_uri):
        params = {
            'appid': settings.WECOM_CORPID,
            'agentid': settings.WECOM_AGENTID,
            'state': wecom_tool.gen_state(request=self.request),
            'redirect_uri': redirect_uri,
        }
        url = URL.QR_CONNECT + '?' + urlencode(params)
        return url


class WeComOAuthMixin(WeComBaseMixin, View):

    def get_oauth_url(self, redirect_uri):
        if not settings.AUTH_WECOM:
            return reverse('authentication:login')

        params = {
            'appid': settings.WECOM_CORPID,
            'agentid': settings.WECOM_AGENTID,
            'state': wecom_tool.gen_state(request=self.request),
            'redirect_uri': redirect_uri,
            'response_type': 'code',
            'scope': 'snsapi_base',
        }
        url = URL.OAUTH_CONNECT + '?' + urlencode(params) + '#wechat_redirect'
        return url


class WeComQRBindView(WeComQRMixin, View):
    permission_classes = (IsAuthenticated, UserConfirmation.require(ConfirmType.RELOGIN))

    def get(self, request: HttpRequest):
        redirect_url = request.GET.get('redirect_url')
        query_string = request.GET.urlencode()
        redirect_url = f'{redirect_url}?{query_string}'
        redirect_uri = reverse('authentication:wecom-qr-bind-callback', external=True)
        redirect_uri += '?' + urlencode({'redirect_url': redirect_url})

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


class WeComQRBindCallbackView(WeComQRMixin, BaseBindCallbackView):
    permission_classes = (IsAuthenticated,)

    client_type_path = 'common.sdk.im.wecom.WeCom'
    client_auth_params = {'corpid': 'WECOM_CORPID', 'corpsecret': 'WECOM_SECRET', 'agentid': 'WECOM_AGENTID'}
    auth_type = 'wecom'
    auth_type_label = _('Wecom')


class WeComEnableStartView(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:wecom-qr-bind')
        success_url += '?' + urlencode({
            'redirect_url': redirect_url or referer
        })
        return success_url


class WeComQRLoginView(WeComQRMixin, View):
    permission_classes = (AllowAny,)

    @pre_save_next_to_session()
    def get(self, request: HttpRequest):
        redirect_url = request.GET.get('redirect_url') or reverse('index')
        redirect_uri = reverse('authentication:wecom-qr-login-callback', external=True)
        redirect_uri += '?' + urlencode({'redirect_url': redirect_url})
        url = self.get_qr_url(redirect_uri)
        return HttpResponseRedirect(url)


class WeComQRLoginCallbackView(WeComQRMixin, BaseLoginCallbackView):
    permission_classes = (AllowAny,)

    client_type_path = 'common.sdk.im.wecom.WeCom'
    client_auth_params = {'corpid': 'WECOM_CORPID', 'corpsecret': 'WECOM_SECRET', 'agentid': 'WECOM_AGENTID'}
    user_type = 'wecom'
    auth_backend = 'AUTH_BACKEND_WECOM'

    msg_client_err = _('WeCom Error')
    msg_user_not_bound_err = _('WeCom is not bound')
    msg_not_found_user_from_client_err = _('Failed to get user from WeCom')


class WeComOAuthLoginView(WeComOAuthMixin, View):
    permission_classes = (AllowAny,)

    @pre_save_next_to_session()
    def get(self, request: HttpRequest):
        redirect_url = request.GET.get('redirect_url')
        redirect_uri = reverse('authentication:wecom-oauth-login-callback', external=True)
        redirect_uri += '?' + urlencode({'redirect_url': redirect_url})
        url = self.get_oauth_url(redirect_uri)
        return HttpResponseRedirect(url)


class WeComOAuthLoginCallbackView(AuthMixin, WeComOAuthMixin, View):
    permission_classes = (AllowAny,)

    @post_save_next_to_session_if_guard_redirect
    def get(self, request: HttpRequest):
        code = request.GET.get('code')
        redirect_url = request.GET.get('redirect_url')
        login_url = reverse('authentication:login')

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

        wecom = WeCom(
            corpid=settings.WECOM_CORPID,
            corpsecret=settings.WECOM_SECRET,
            agentid=settings.WECOM_AGENTID
        )
        wecom_userid, __ = wecom.get_user_id_by_code(code)
        if not wecom_userid:
            # 正常流程不会出这个错误，hack 行为
            msg = _('Failed to get user from WeCom')
            response = self.get_failed_response(login_url, title=msg, msg=msg)
            return response

        user = get_object_or_none(User, wecom_id=wecom_userid)
        if user is None:
            title = _('WeCom is not bound')
            msg = _('Please login with a password and then bind the WeCom')
            response = self.get_failed_response(login_url, title=title, msg=msg)
            return response

        try:
            self.check_oauth2_auth(user, settings.AUTH_BACKEND_WECOM)
        except errors.AuthFailedError as e:
            self.set_login_failed_mark()
            msg = e.msg
            response = self.get_failed_response(login_url, title=msg, msg=msg)
            return response
        return self.redirect_to_guard_view()
