import datetime
from collections import defaultdict
from rest_framework import serializers, status

from api.models import TtDepartment, TtZone, TtTag, TtUsagePreference, TtTravelTable, TtSetting, TtAcademicTerm, TtTimeBlock
from api.views.admin.base import AdminApiBase
from api.validator import BaseValidator
from api.utils import log_critical_error, get_exception_detail, start_slot_end_slot_to_pattern
from rest_framework.exceptions import ValidationError
from api.translation import __


class TravelTableRules(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "id": "nullable|array|exists:api.TtTravelTable,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get travel_table 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:
            setting_params = {
                "slot_per_week",
            }
            settings = TtSetting.get_multiple_setting(setting_params)
            slot_per_week = int(settings["slot_per_week"])
            self.api_log_skip_outgoing_data=True
            self.validate_request(request)
            ids = request.data.get("id")
            if not ids:
                ids = []
            travel_table = None
            if isinstance(ids, (list, tuple)) and len(ids) == 1:
                travel_table = (
                    TtTravelTable.objects
                    .select_related("department")
                    .prefetch_related(
                        'journey__from_zone',
                        'journey__to_zone',
                        "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)
                    .first()
                )

            info = None
            if travel_table:
                info = {
                    "code": travel_table.code,
                    "name": travel_table.name,
                    "desc": travel_table.desc,
                    "department_id": travel_table.department_id,
                    "journeys": [
                        {
                            "id": journey.id,
                            "from_zone": {"id": journey.from_zone.id, "name": journey.from_zone.name,"code": journey.from_zone.code},
                            "to_zone": {"id": journey.to_zone.id, "name": journey.to_zone.name,"code": journey.to_zone.code},
                            "slot_required": journey.slot_required,
                        }
                        for journey in travel_table.journey.all()
                    ],
                    "tag": travel_table.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(travel_table, extra_data_field, None)

            models = {
                "department": (TtDepartment, ["id", "code", "name"]),
                "zone": (TtZone, ["id", "code", "name"]),
                "tag": (TtTag, ["id", "code", "name"]),
            }

            data = {}
            data['delete_confirmation_api'] = False
            data["allow_remove"] = [
                "desc",
                "department_id",
                "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)
            for key, (model, fields) in models.items():
                data[key] = list(
                    model.objects.filter(status=model.STATUS_TO_CODE['active']).values(*fields)
                )
                if key == "time_block" and data[key]:
                    for val in data[key]:
                        val["pattern"] = start_slot_end_slot_to_pattern(val['start_slot'], val['end_slot'],slot_per_week)

            minute_per_slot = int(data["based_setting"]["minute_per_slot"])
            start = datetime.datetime.strptime("00:00", "%H:%M")
            data["slot_required"] = []
            current = start
            current_minute = 0

            total_slot = 48
            for slot in range(0, total_slot + 1):
                # dun show slot 0
                if slot != 0:
                    data["slot_required"].append({
                        "id": slot,
                        "name": f"{current.strftime('%H:%M')} {__("attr.hours")}"
                    })
                current += datetime.timedelta(minutes=minute_per_slot)
                current_minute += minute_per_slot
            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)