from rest_framework import status
from rest_framework.exceptions import ValidationError

from api.models import EsExamActivity, EsExamRequirement, EsExamRequirementSameTime
from api.translation import __
from api.utils import get_exception_detail, log_critical_error
from api.validator import BaseValidator
from api.views.admin.exam_requirement_relation_grouping import (
    related_foreign_exam_activity_ids_for_requirement,
    related_group_ids_for_requirement,
)
from api.views.admin.base import AdminApiBase


class ExamRequirementUpdateSameTimeRules(AdminApiBase):
    def validate_request(self, request):
        rules = {
            "id": "nullable|array|exists:api.EsExamRequirement,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 = []

            exam_requirement_qs = EsExamRequirement.objects.select_related("exam_period").filter(id__in=ids)
            exam_period_ids = list(
                exam_requirement_qs.values_list("exam_period_id", flat=True).distinct()
            )

            obj = None
            if isinstance(ids, (list, tuple)) and len(ids) == 1:
                obj = (
                    EsExamRequirement.objects
                    .filter(id__in=ids)
                    .first()
                )

            info = None
            if obj:
                related_exam_activity_ids = sorted(
                    related_foreign_exam_activity_ids_for_requirement(EsExamRequirementSameTime, obj.id)
                )
                info = {
                    "name": obj.name,
                    "exam_activity_id": related_exam_activity_ids,
                }

            data = {
                "delete_confirmation_api": False,
                "allow_remove": [
                    "exam_activity_id",
                ],
                }

            exam_activity_qs = (
                EsExamActivity.objects
                .select_related("exam_requirement", "location", "session")
                .order_by("name", "id")
            )
            if ids:
                exam_activity_qs = (
                    exam_activity_qs
                    .filter(exam_requirement__exam_period_id__in=exam_period_ids)
                    .exclude(exam_requirement_id__in=ids)
                )

            data["exam_activity"] = [
                {
                    "id": exam_activity.id,
                    "code": exam_activity.code,
                    "name": exam_activity.name,
                    # "exam_requirement_id": exam_activity.exam_requirement_id,
                    # "exam_requirement": exam_activity.exam_requirement.name if exam_activity.exam_requirement else None,
                    # "location_id": exam_activity.location_id,
                    # "location": exam_activity.location.name if exam_activity.location else None,
                    # "session_id": exam_activity.session_id,
                    # "time_slot": exam_activity.time_slot,
                    # "is_scheduled": exam_activity.is_scheduled,
                }
                for exam_activity in exam_activity_qs.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)