from collections import defaultdict
from rest_framework import serializers, status

from api.models import TtDepartment, TtZone, TtTag, TtUsagePreference, TtConstraintProfile, TtSetting, TtAcademicTerm, \
    TtTimeBlock, TtFreeBlock, TtResourceBreak, TtMaximumWorkspan, TtMaximumHour, TtTravelTable
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 ConstraintProfileRules(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "id": "nullable|array|exists:api.TtConstraintProfile,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get constraint_profile 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 = []
            constraint_profile = None
            if isinstance(ids, (list, tuple)) and len(ids) == 1:
                constraint_profile = (
                    TtConstraintProfile.objects
                    .select_related("department")
                    .prefetch_related(
                        "free_block",
                        "resource_break",
                        "maximum_hour",
                        "maximum_workspan",
                        "travel_table",
                        "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()
                )
            relation_table = {
                "free_block": {"id", "code", "name"},
                "resource_break": {"id", "code", "name"},
                "maximum_workspan": {"id", "code", "name"},
                "maximum_hour": {"id", "code", "name"},
                "travel_table": {"id", "code", "name"}
            }
            info = None
            if constraint_profile:
                info = {
                    "code": constraint_profile.code,
                    "name": constraint_profile.name,
                    "desc": constraint_profile.desc,
                    "department_id": constraint_profile.department_id,
                    "active_constraints": [],
                    "tag": constraint_profile.tag.all().values_list("tag_id",flat=True),
                }
                for relation_key, relation_columns in relation_table.items():
                    relation_models = getattr(constraint_profile, relation_key, None)
                    if relation_models:
                        new_items = [
                            {
                                **{column: getattr(item, column) for column in relation_columns},
                                "category": relation_key
                            }
                            for item in relation_models.all()
                        ]
                        info["active_constraints"].extend(new_items)
                for i in range(1, 11):
                    extra_data_field = f"extra_data_{i}"
                    info[extra_data_field] = getattr(constraint_profile, extra_data_field, None)

            models = {
                "department": (TtDepartment, ["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)]
            ]
            for key, (model, fields) in models.items():
                data[key] = list(
                    model.objects.filter(status=model.STATUS_TO_CODE['active']).values(*fields)
                )

            # for reduce repeated code
            relation_key_to_table = {
                "free_block": TtFreeBlock,
                "resource_break": TtResourceBreak,
                "maximum_workspan": TtMaximumWorkspan,
                "maximum_hour": TtMaximumHour,
                "travel_table": TtTravelTable
            }

            data['active_constraints'] = []
            for relation_key, relation_columns in relation_table.items():
                model = relation_key_to_table[relation_key]
                # get all data from constraint
                constraint_data = model.objects.all()
                if constraint_data:
                    new_items = [
                        {
                            **{column: getattr(item, column) for column in relation_columns},
                            "category": relation_key,
                            "category_name": __("attr."+relation_key)
                        }
                        for item in constraint_data.all()
                    ]
                    data["active_constraints"].extend(new_items)

            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)