from django.db import connection
from rest_framework import status
from rest_framework.exceptions import ValidationError

from api.models import TtStaff, TtTagRelation, TtLocation, TtPathway, TtStudent
from api.models.tt_student_set import TtStudentSet
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 StudentList(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "filter": "nullable",
            "page": "nullable",
            "per_page": "nullable",
            "sort_by": "nullable",
            "order_by": "nullable",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get pos by id, if wrong id direct return error
        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)

            data = self.get_data(request)
            response = 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)

    def get_data(self,request):
        students = (
            TtStudent.objects
            .select_related("department")
            .prefetch_related(
                "academic_term",
                "pos",
                "pos_module__module",
                "pos_module__pos_module_group__module_group",
                "pos_module__pos_module_group__pos",
                "student_set",
                "tag__tag" #tags means the relation add in models, __tag means the relation table tag_id get the tag object
            )
        )
        students = self.listing_filter(request,students)
        paginated_details = self.listing_pagination(request,students)
        total = paginated_details["total"]
        paginated_data = paginated_details["paginated_data"]
        page = paginated_details["page"]

        return_data=[]
        for val in paginated_data:
            data={}
            data["id"] = val.id
            data["code"] = val.code
            data["name"] = val.name
            data['desc'] = val.desc
            data['email'] = val.email
            data['department'] = val.department.name if val.department else None
            data['department_id'] = val.department_id
            data['academic_term'] = [
                {"id": academic_term.id,"name": academic_term.name,}
                for academic_term in val.academic_term.all()
            ]
            data['pos'] = [
                {"id": pos.id,"name": pos.name}
                for pos in val.pos.all()
            ]
            data['pos_module'] = [
                {
                    "id": pos_module.id,
                    "name": pos_module.module.name,
                    "module_group":pos_module.pos_module_group.module_group.name,
                    "pos_name": pos_module.pos_module_group.pos.name
                }
                for pos_module in val.pos_module.all()
            ]

            data['student_set'] = [
                {"id": student_set.id,"name": student_set.name}
                for student_set in val.student_set.all()
            ]

            data["tag"] = [
                {"id": tag.tag.id, "name": tag.tag.name}
                for tag in val.tag.all()
            ]
            for i in range(1,11):
                extra_data_field = f"extra_data_{i}"
                data[extra_data_field] = getattr(val,extra_data_field,None)

            return_data.append(data)
        return {
            "total": total,
            "page": page,
            "data": return_data,
        }