from rest_framework import status
from rest_framework.exceptions import ValidationError

from api.models import EsLocation
from api.models.es_session import EsSession
from api.translation import __
from api.utils import log_critical_error, get_exception_detail
from api.validator import BaseValidator
from api.views.admin.base import AdminApiBase


class SessionRules(AdminApiBase):
    def validate_request(self, request):
        rules = {
            "id": "nullable|array|exists:api.EsSession,id",
        }

        attribute = {}

        validator = BaseValidator(request.data, rules, attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)

    def post(self, request):
        try:
            self.api_log_skip_outgoing_data = True
            self.validate_request(request)

            ids = request.data.get("id")
            if not ids:
                ids = []
            obj = None
            if isinstance(ids, (list, tuple)) and len(ids) == 1:
                obj = (
                    EsSession.objects
                    .select_related("location")
                    .filter(id__in=ids)
                    .first()
                )

            info = None
            if obj:
                info = {}
                info["id"] = obj.id
                info["name"] = obj.name
                info["location_id"] = obj.location_id
                info["location"] = obj.location.name if obj.location else None
                info["description"] = obj.description
                info["start_time"] = obj.start_time
                info["duration"] = obj.duration
                info["students_enrolled"] = obj.students_enrolled
                info["invigilators_required"] = obj.invigilators_required

            data = {}
            data["delete_confirmation_api"] = False
            data["allow_remove"] = [
                "description",
                "location_id",
            ]
            data["location"] = [
                {
                    "id": location.id,
                    "code": location.code,
                    "name": location.name,
                }
                for location in EsLocation.objects.filter(status=EsLocation.STATUS_TO_CODE["active"]).order_by("name").all()
            ]

            response = {
                "info": info,
                "rules": data,
            }

            return self.api_response(data=response)
        except ValidationError as e:
            first_message = e.detail["error"]
            errors = e.detail["errors"]
            return self.api_response(error=first_message, errors=errors, code=status.HTTP_400_BAD_REQUEST)
        except Exception as e:
            e_details = get_exception_detail(e)
            log_critical_error(user_id=None, descr=e_details["descr"], url=e_details["url"], trace=e_details["trace"])
            return self.api_response(error=__("message.internal_server_error"), code=status.HTTP_500_INTERNAL_SERVER_ERROR)