import logging
from urllib.parse import urljoin

from django.apps import apps
from django.conf import settings
from django.core.exceptions import ObjectDoesNotExist
from django.db.utils import IntegrityError
from django.urls import reverse
from django_filters import rest_framework as filters
from rest_framework import mixins, status, viewsets
from rest_framework.decorators import action
from rest_framework.exceptions import NotFound
from rest_framework.filters import SearchFilter
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework.views import APIView

from apps.api.permissions import (
    MODIFY_ACTIONS,
    READ_ACTIONS,
    ActionPermission,
    AnyRole,
    IsAdminOrEditor,
    IsOwnerOrAdmin,
)
from apps.api.serializers.user import FilterUserSerializer, UserHiddenFieldsSerializer, UserSerializer
from apps.auth_token.auth import (
    MobileAppAuthTokenAuthentication,
    MobileAppVerificationTokenAuthentication,
    PluginAuthentication,
)
from apps.auth_token.constants import SCHEDULE_EXPORT_TOKEN_NAME
from apps.auth_token.models import UserScheduleExportAuthToken
from apps.auth_token.models.mobile_app_auth_token import MobileAppAuthToken
from apps.auth_token.models.mobile_app_verification_token import MobileAppVerificationToken
from apps.base.messaging import get_messaging_backend_from_id
from apps.base.utils import live_settings
from apps.telegram.client import TelegramClient
from apps.telegram.models import TelegramVerificationCode
from apps.twilioapp.phone_manager import PhoneManager
from apps.twilioapp.twilio_client import twilio_client
from apps.user_management.models import User
from apps.user_management.organization_log_creator import OrganizationLogType, create_organization_log
from common.api_helpers.exceptions import Conflict
from common.api_helpers.mixins import FilterSerializerMixin, PublicPrimaryKeyMixin
from common.api_helpers.paginators import HundredPageSizePaginator
from common.constants.role import Role

logger = logging.getLogger(__name__)


class CurrentUserView(APIView):
    authentication_classes = (
        MobileAppAuthTokenAuthentication,
        PluginAuthentication,
    )
    permission_classes = (IsAuthenticated,)

    def get(self, request):
        context = {"request": self.request, "format": self.format_kwarg, "view": self}

        if settings.OSS_INSTALLATION and live_settings.GRAFANA_CLOUD_NOTIFICATIONS_ENABLED:
            from apps.oss_installation.models import CloudConnector, CloudUserIdentity

            connector = CloudConnector.objects.first()
            if connector is not None:
                cloud_identities = list(CloudUserIdentity.objects.filter(email__in=[request.user.email]))
                cloud_identities = {cloud_identity.email: cloud_identity for cloud_identity in cloud_identities}
                context["cloud_identities"] = cloud_identities
                context["connector"] = connector

        serializer = UserSerializer(request.user, context=context)
        return Response(serializer.data)

    def put(self, request):
        serializer = UserSerializer(request.user, data=self.request.data, context={"request": self.request})
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data)


class UserFilter(filters.FilterSet):
    """
    https://django-filter.readthedocs.io/en/master/guide/rest_framework.html
    """

    email = filters.CharFilter(field_name="email", lookup_expr="icontains")
    roles = filters.MultipleChoiceFilter(field_name="role", choices=Role.choices())

    class Meta:
        model = User
        fields = ["email", "roles"]


class UserView(
    PublicPrimaryKeyMixin,
    FilterSerializerMixin,
    mixins.RetrieveModelMixin,
    mixins.UpdateModelMixin,
    mixins.ListModelMixin,
    viewsets.GenericViewSet,
):
    authentication_classes = (PluginAuthentication,)
    permission_classes = (IsAuthenticated, ActionPermission)

    # Non-admin users are allowed to list and retrieve users
    # The overridden get_serializer_class will return
    # another Serializer for non-admin users with sensitive information hidden
    action_permissions = {
        IsAdminOrEditor: (
            *MODIFY_ACTIONS,
            "list",
            "metadata",
            "verify_number",
            "forget_number",
            "get_verification_code",
            "get_backend_verification_code",
            "get_telegram_verification_code",
            "unlink_telegram",
            "unlink_backend",
            "make_test_call",
            "export_token",
            "mobile_app_verification_token",
            "mobile_app_auth_token",
        ),
        AnyRole: ("retrieve",),
    }

    action_object_permissions = {
        IsOwnerOrAdmin: (
            *MODIFY_ACTIONS,
            *READ_ACTIONS,
            "verify_number",
            "forget_number",
            "get_verification_code",
            "get_backend_verification_code",
            "get_telegram_verification_code",
            "unlink_telegram",
            "unlink_backend",
            "make_test_call",
            "export_token",
            "mobile_app_verification_token",
            "mobile_app_auth_token",
        ),
    }

    filter_serializer_class = FilterUserSerializer

    pagination_class = HundredPageSizePaginator

    filter_backends = (SearchFilter, filters.DjangoFilterBackend)
    # NB start search params
    # '^' Starts-with search.
    # '=' Exact matches.
    # '@' Full-text search. (Currently only supported Django's MySQL backend.)
    # '$' Regex search.
    search_fields = (
        "^email",
        "^username",
        "^slack_user_identity__cached_slack_login",
        "^slack_user_identity__cached_name",
    )

    filterset_class = UserFilter

    def get_serializer_class(self):
        is_filters_request = self.request.query_params.get("filters", "false") == "true"
        if self.action in ["list"] and is_filters_request:
            return self.get_filter_serializer_class()

        is_user_retrieves_own_data = (
            self.action == "retrieve"
            and self.kwargs.get("pk") is not None
            and self.kwargs.get("pk") == self.request.user.public_primary_key
        )
        if is_user_retrieves_own_data or self.request.user.role == Role.ADMIN:
            return UserSerializer
        return UserHiddenFieldsSerializer

    def get_queryset(self):
        slack_identity = self.request.query_params.get("slack_identity", None) == "true"

        queryset = User.objects.filter(organization=self.request.user.organization)

        if self.request.user.current_team is not None:
            queryset = queryset.filter(teams=self.request.user.current_team).distinct()

        queryset = self.get_serializer_class().setup_eager_loading(queryset)

        if slack_identity:
            queryset = queryset.filter(slack_user_identity__isnull=False).distinct()

        return queryset.order_by("id")

    def list(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())

        page = self.paginate_queryset(queryset)
        if page is not None:
            context = {"request": self.request, "format": self.format_kwarg, "view": self}
            if settings.OSS_INSTALLATION:
                if live_settings.GRAFANA_CLOUD_NOTIFICATIONS_ENABLED:
                    from apps.oss_installation.models import CloudConnector, CloudUserIdentity

                    connector = CloudConnector.objects.first()
                    if connector is not None:
                        emails = list(queryset.values_list("email", flat=True))
                        cloud_identities = list(CloudUserIdentity.objects.filter(email__in=emails))
                        cloud_identities = {cloud_identity.email: cloud_identity for cloud_identity in cloud_identities}
                        context["cloud_identities"] = cloud_identities
                        context["connector"] = connector
            serializer = self.get_serializer(page, many=True, context=context)
            return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)

    def retrieve(self, request, *args, **kwargs):
        context = {"request": self.request, "format": self.format_kwarg, "view": self}
        instance = self.get_object()

        if settings.OSS_INSTALLATION and live_settings.GRAFANA_CLOUD_NOTIFICATIONS_ENABLED:
            from apps.oss_installation.models import CloudConnector, CloudUserIdentity

            connector = CloudConnector.objects.first()
            if connector is not None:
                cloud_identities = list(CloudUserIdentity.objects.filter(email__in=[instance.email]))
                cloud_identities = {cloud_identity.email: cloud_identity for cloud_identity in cloud_identities}
                context["cloud_identities"] = cloud_identities
                context["connector"] = connector

        serializer = self.get_serializer(instance, context=context)
        return Response(serializer.data)

    def current(self, request):
        serializer = UserSerializer(self.get_queryset().get(pk=self.request.user.pk))
        return Response(serializer.data)

    @action(detail=True, methods=["get"])
    def get_verification_code(self, request, pk):
        user = self.get_object()
        phone_manager = PhoneManager(user)
        code_sent = phone_manager.send_verification_code()

        if not code_sent:
            return Response(status=status.HTTP_400_BAD_REQUEST)
        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["put"])
    def verify_number(self, request, pk):
        target_user = self.get_object()
        code = request.query_params.get("token", None)
        old_state = target_user.repr_settings_for_client_side_logging
        phone_manager = PhoneManager(target_user)
        verified, error = phone_manager.verify_phone_number(code)

        if not verified:
            return Response(error, status=status.HTTP_400_BAD_REQUEST)
        organization = request.auth.organization
        new_state = target_user.repr_settings_for_client_side_logging
        description = f"User settings for user {target_user.username} was changed from:\n{old_state}\nto:\n{new_state}"
        create_organization_log(
            organization,
            request.user,
            OrganizationLogType.TYPE_USER_SETTINGS_CHANGED,
            description,
        )
        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["put"])
    def forget_number(self, request, pk):
        target_user = self.get_object()
        old_state = target_user.repr_settings_for_client_side_logging
        phone_manager = PhoneManager(target_user)
        forget = phone_manager.forget_phone_number()

        if forget:
            organization = request.auth.organization
            new_state = target_user.repr_settings_for_client_side_logging
            description = (
                f"User settings for user {target_user.username} was changed from:\n{old_state}\nto:\n{new_state}"
            )
            create_organization_log(
                organization,
                request.user,
                OrganizationLogType.TYPE_USER_SETTINGS_CHANGED,
                description,
            )
        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["post"])
    def make_test_call(self, request, pk):
        user = self.get_object()
        phone_number = user.verified_phone_number

        if phone_number is None:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        try:
            twilio_client.make_test_call(to=phone_number)
        except Exception as e:
            logger.error(f"Unable to make a test call due to {e}")
            return Response(
                data="Something went wrong while making a test call", status=status.HTTP_500_INTERNAL_SERVER_ERROR
            )

        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["get"])
    def get_backend_verification_code(self, request, pk):
        backend_id = request.query_params.get("backend")
        backend = get_messaging_backend_from_id(backend_id)
        if backend is None:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        user = self.get_object()
        code = backend.generate_user_verification_code(user)
        return Response(code)

    @action(detail=True, methods=["get"])
    def get_telegram_verification_code(self, request, pk):
        user = self.get_object()

        if not user.is_telegram_connected:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        try:
            existing_verification_code = user.telegram_verification_code
            existing_verification_code.delete()
        except TelegramVerificationCode.DoesNotExist:
            pass

        new_code = TelegramVerificationCode(user=user)
        new_code.save()

        telegram_client = TelegramClient()
        bot_username = telegram_client.api_client.username
        bot_link = f"https://t.me/{bot_username}"

        return Response({"telegram_code": str(new_code.uuid), "bot_link": bot_link}, status=status.HTTP_200_OK)

    @action(detail=True, methods=["post"])
    def unlink_telegram(self, request, pk):
        user = self.get_object()
        TelegramToUserConnector = apps.get_model("telegram", "TelegramToUserConnector")

        try:
            connector = TelegramToUserConnector.objects.get(user=user)
            connector.delete()
        except TelegramToUserConnector.DoesNotExist:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        description = f"Telegram account of user {user.username} was disconnected"
        create_organization_log(
            user.organization,
            user,
            OrganizationLogType.TYPE_TELEGRAM_FROM_USER_DISCONNECTED,
            description,
        )

        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["post"])
    def unlink_backend(self, request, pk):
        backend_id = request.query_params.get("backend")
        backend = get_messaging_backend_from_id(backend_id)
        if backend is None:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        user = self.get_object()
        try:
            backend.unlink_user(user)
        except ObjectDoesNotExist:
            return Response(status=status.HTTP_400_BAD_REQUEST)

        description = f"{backend.label} account of user {user.username} was disconnected"
        create_organization_log(
            user.organization,
            user,
            OrganizationLogType.TYPE_MESSAGING_BACKEND_USER_DISCONNECTED,
            description,
        )

        return Response(status=status.HTTP_200_OK)

    @action(detail=True, methods=["get", "post", "delete"])
    def export_token(self, request, pk):
        user = self.get_object()

        if self.request.method == "GET":
            try:
                token = UserScheduleExportAuthToken.objects.get(user=user)
            except UserScheduleExportAuthToken.DoesNotExist:
                raise NotFound

            response = {
                "created_at": token.created_at,
                "revoked_at": token.revoked_at,
                "active": token.active,
            }
            return Response(response, status=status.HTTP_200_OK)

        if self.request.method == "POST":
            try:
                instance, token = UserScheduleExportAuthToken.create_auth_token(user, user.organization)
            except IntegrityError:
                raise Conflict("Schedule export token for user already exists")

            export_url = urljoin(
                settings.BASE_URL,
                reverse("api-public:users-schedule-export", kwargs={"pk": user.public_primary_key})
                + f"?{SCHEDULE_EXPORT_TOKEN_NAME}={token}",
            )

            data = {"token": token, "created_at": instance.created_at, "export_url": export_url}
            return Response(data, status=status.HTTP_201_CREATED)

        if self.request.method == "DELETE":
            try:
                token = UserScheduleExportAuthToken.objects.get(user=user)
                token.delete()
            except UserScheduleExportAuthToken.DoesNotExist:
                raise NotFound

            return Response(status=status.HTTP_204_NO_CONTENT)

    @action(detail=True, methods=["get", "post", "delete"])
    def mobile_app_verification_token(self, request, pk):
        DynamicSetting = apps.get_model("base", "DynamicSetting")

        if not settings.MOBILE_APP_PUSH_NOTIFICATIONS_ENABLED:
            return Response(status=status.HTTP_404_NOT_FOUND)

        mobile_app_settings = DynamicSetting.objects.get_or_create(
            name="mobile_app_settings",
            defaults={
                "json_value": {
                    "org_ids": [],
                }
            },
        )[0]
        if self.request.auth.organization.pk not in mobile_app_settings.json_value["org_ids"]:
            return Response(status=status.HTTP_404_NOT_FOUND)

        user = self.get_object()

        if self.request.method == "GET":
            try:
                token = MobileAppVerificationToken.objects.get(user=user)
            except MobileAppVerificationToken.DoesNotExist:
                raise NotFound

            response = {
                "token_id": token.id,
                "user_id": token.user_id,
                "organization_id": token.organization_id,
                "created_at": token.created_at,
                "revoked_at": token.revoked_at,
            }
            return Response(response, status=status.HTTP_200_OK)

        if self.request.method == "POST":
            # If token already exists revoke it
            try:
                token = MobileAppVerificationToken.objects.get(user=user)
                token.delete()
            except MobileAppVerificationToken.DoesNotExist:
                pass

            instance, token = MobileAppVerificationToken.create_auth_token(user, user.organization)
            data = {"id": instance.pk, "token": token, "created_at": instance.created_at}
            return Response(data, status=status.HTTP_201_CREATED)

        if self.request.method == "DELETE":
            try:
                token = MobileAppVerificationToken.objects.get(user=user)
                token.delete()
            except MobileAppVerificationToken.DoesNotExist:
                raise NotFound

            return Response(status=status.HTTP_204_NO_CONTENT)

    @action(
        methods=["get", "post", "delete"],
        detail=False,
        authentication_classes=(MobileAppVerificationTokenAuthentication,),
    )
    def mobile_app_auth_token(self, request):
        DynamicSetting = apps.get_model("base", "DynamicSetting")

        if not settings.MOBILE_APP_PUSH_NOTIFICATIONS_ENABLED:
            return Response(status=status.HTTP_404_NOT_FOUND)

        mobile_app_settings = DynamicSetting.objects.get_or_create(
            name="mobile_app_settings",
            defaults={
                "json_value": {
                    "org_ids": [],
                }
            },
        )[0]
        if self.request.auth.organization.pk not in mobile_app_settings.json_value["org_ids"]:
            return Response(status=status.HTTP_404_NOT_FOUND)

        if self.request.method == "GET":
            try:
                token = MobileAppAuthToken.objects.get(user=self.request.user)
            except MobileAppAuthToken.DoesNotExist:
                raise NotFound

            response = {
                "token_id": token.id,
                "user_id": token.user_id,
                "organization_id": token.organization_id,
                "created_at": token.created_at,
                "revoked_at": token.revoked_at,
            }
            return Response(response, status=status.HTTP_200_OK)

        if self.request.method == "POST":
            # If token already exists revoke it
            try:
                token = MobileAppAuthToken.objects.get(user=self.request.user)
                token.delete()
            except MobileAppAuthToken.DoesNotExist:
                pass

            instance, token = MobileAppAuthToken.create_auth_token(self.request.user, self.request.user.organization)
            data = {"id": instance.pk, "token": token, "created_at": instance.created_at}
            return Response(data, status=status.HTTP_201_CREATED)

        if self.request.method == "DELETE":
            try:
                token = MobileAppAuthToken.objects.get(user=self.request.user)
                token.delete()
            except MobileAppVerificationToken.DoesNotExist:
                raise NotFound

            return Response(status=status.HTTP_204_NO_CONTENT)