from collections import defaultdict
from rest_framework import serializers, status

from api.models import TtStaffSuitability, TtDepartment, TtZone, TtAvailability, TtStartPreference, TtUsagePreference, \
    TtSuitability, TtTag, TtSetting, TtPos, TtPosModuleGroup, TtPosModuleGroupModule, TtAcademicTerm, \
    TtConstraintProfile
from api.models.tt_student_set import TtStudentSet
from api.views.admin.base import AdminApiBase
from api.validator import BaseValidator
from api.utils import decrypt_aes_128_cbc, encrypt_aes_128_cbc, log_critical_error, get_exception_detail
from rest_framework.exceptions import ValidationError
from api.translation import __


class StudentRulesGetPosModule(AdminApiBase):
    def validate_request(self,request):
        rules = {
            # "id": "nullable|array|exists:api.TtStudentSet,id",
            "pos_ids": "required|array|exists:api.TtPos,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get student_set by id, if wrong id direct return error
        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)
        # custom error after basic validation

        if error:
            raise ValidationError(error)

    def post(self, request):
        # Validate input
        try:
            self.api_log_skip_outgoing_data=True
            self.validate_request(request)
            pos_ids = request.data.get('pos_ids')
            pos_module_list = (
                TtPosModuleGroupModule.objects
                .filter(pos_module_group__pos_id__in=pos_ids)
                .select_related(
                    "pos_module_group",
                    "pos_module_group__module_group",
                    "pos_module_group__pos",
                    "module"
                )
            )

            data = {}
            for pos_module in pos_module_list:
                pos_module_pos = pos_module.pos_module_group.pos

                if pos_module_pos.id not in data:
                    data[pos_module_pos.id] = {
                        "id": pos_module_pos.id,
                        "name": pos_module_pos.name,
                        "code": pos_module_pos.code,
                        "module": []
                    }

                data[pos_module_pos.id]["module"].append({
                    "id": pos_module.id,
                    "name": pos_module.module.name,
                    "code": pos_module.module.code,
                    "module_group": pos_module.pos_module_group.module_group.name,
                    "planned_size": pos_module.module.planned_size,
                    "credit_provided": pos_module.module.credit_provided,
                })

            response = {
                "data": list(data.values()),
            }

            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)