from collections import defaultdict
from rest_framework import serializers, status

from api.models import TtStaffSuitability, TtDepartment, TtZone, TtAvailability, TtStartPreference, TtUsagePreference, \
    TtSuitability, TtTag, TtSetting, TtModule, TtWeekPattern, TtWeek, TtAcademicTerm
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, \
    calculate_preset_pattern_time
from rest_framework.exceptions import ValidationError
from api.translation import __


class ModuleRules(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "id": "nullable|array|exists:api.TtModule,id",
            "academic_term_id": "required|exists:api.TtAcademicTerm,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get module 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)
            academic_term_id = request.data.get("academic_term_id")
            academic_term = TtAcademicTerm.objects.filter(id=academic_term_id).prefetch_related("week").first()

            ids = request.data.get("id")
            if not ids:
                ids = []
            module = None
            if isinstance(ids, (list, tuple)) and len(ids) == 1:
                module = (
                    TtModule.objects
                    .select_related("department","academic_term", "week_pattern", "availability", "start_preference", "usage_preference")
                    .prefetch_related(
                        "tag__tag"
                        # tags means the relation add in models, __tag means the relation table tag_id get the tag object #2
                    )
                    .filter(id__in=ids,academic_term_id=academic_term_id)
                    .first()
                )

            info = None
            if module:
                info = {
                    "code": module.code,
                    "name": module.name,
                    "desc": module.desc,
                    "department_id": module.department_id,
                    "academic_term_id": module.academic_term_id,
                    "planned_size": module.planned_size,
                    "real_size": module.real_size,
                    "credit_provided": module.credit_provided,
                    "week_pattern_id": module.week_pattern_id,
                    "week_pattern": module.week.all().values_list("id",flat=True),
                    "availability_id": module.availability_id,
                    "availability_pattern": module.availability_pattern,
                    "usage_preference_id": module.usage_preference_id,
                    "usage_preference_pattern": module.usage_preference_pattern,
                    "start_preference_id": module.start_preference_id,
                    "start_preference_pattern": module.start_preference_pattern,
                    "tag": module.tag.all().values_list("tag_id",flat=True),
                }
                for i in range(1, 11):
                    extra_data_field = f"extra_data_{i}"
                    info[extra_data_field] = getattr(module, extra_data_field, None)

            data = {}
            data['delete_confirmation_api'] = True
            data["allow_remove"] = [
                "desc",
                "department_id",
                "week_pattern_id",
                "week_pattern",
                "availability_id",
                "availability_pattern",
                "start_preference_id",
                "start_preference_pattern",
                "usage_preference_id",
                "usage_preference_pattern",
                "tag",
                *[f"extra_data_{i}" for i in range(1, 11)]
            ]
            setting_params = {
                "minute_per_slot",
                "slot_per_day",
                "slot_per_week",
            }
            data['based_setting'] = TtSetting.get_multiple_setting(setting_params)

            models = {
                "department": (TtDepartment, ["id", "code", "name"]),
                "academic_term": (TtAcademicTerm, ["id", "code", "name","start_time","end_time", "default_availability","default_usage","default_start"]),
                "availability": (TtAvailability, ["id", "code", "name", "pattern"]),
                "start_preference": (TtStartPreference, ["id","code", "name", "pattern"]),
                "usage_preference": (TtUsagePreference, ["id", "code", "name", "pattern"]),
                "tag": (TtTag, ["id", "code", "name"]),
            }

            for key, (model, fields) in models.items():
                if key == "academic_term":
                    data[key] = list(
                        model.objects.filter(id=academic_term_id,status=model.STATUS_TO_CODE['active']).values(*fields)
                    )
                else:
                    data[key] = list(
                        model.objects.filter(status=model.STATUS_TO_CODE['active']).values(*fields)
                    )

            # for type in ["availability", "usage_preference", "start_preference"]:
            #     for val in data[type]:
            #         start_end_time = calculate_preset_pattern_time(type, val.get('pattern'), data['based_setting'].get("minute_per_slot"),data['based_setting'].get("slot_per_day"))
            #         val['start_time'] = start_end_time.get("start_time")
            #         val['end_time'] = start_end_time.get("end_time")

            # special case to handle avoid_concurrency, cause using different checking
            week_patterns = TtWeekPattern.objects.prefetch_related("week").filter(status=TtWeekPattern.STATUS_TO_CODE['active'],academic_term_id=academic_term_id)
            data["week_pattern"] = []
            for week_pattern in week_patterns:
                data['week_pattern'].append({
                    "id": week_pattern.id,
                    "code": week_pattern.code,
                    "name": week_pattern.name,
                    "academic_term_id": week_pattern.academic_term_id,
                    "pattern": week_pattern.week.all().values("week","start_date"),
                })
            data['week'] = list(academic_term.week.all().values("id","week","start_date").order_by("week"))

            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)