"""
Сервисы для работы с формой Ф-6.

Содержит:
- FormF6Service - CRUD операции
- FormF6Parser - парсинг Excel
"""

import logging
from typing import Any

from django.db import transaction
from django.db.models import Count, Max

from apps.core.excel import (
    BaseExcelParser,
    ColumnMapping,
    ParseResult,
    RowData,
)
from apps.core.reporting import ReportingPeriodParserMixin, VersionedReportServiceMixin
from apps.core.services import BaseService, BulkOperationsMixin
from apps.form_6.models import FormF6Record
from apps.organization.services import OrganizationService

logger = logging.getLogger(__name__)


class FormF6Service(
    BulkOperationsMixin,
    VersionedReportServiceMixin[FormF6Record],
    BaseService[FormF6Record],
):
    """Сервис для работы с записями формы Ф-6."""

    model = FormF6Record

    @classmethod
    def get_by_organization(cls, organization_id):
        """Получить записи организации."""
        return cls.get_queryset().filter(organization_id=organization_id)

    @classmethod
    def get_by_batch(cls, batch_id: int):
        return cls.get_queryset().filter(load_batch=batch_id)

    @classmethod
    def get_by_load_batch(cls, batch_id: int):
        """Совместимость со старым API сервиса."""
        return cls.get_by_batch(batch_id)

    @classmethod
    def delete_by_load_batch(cls, batch_id: int) -> int:
        """Удалить записи по номеру загрузки."""
        deleted_count, _ = cls.get_queryset().filter(load_batch=batch_id).delete()
        return deleted_count

    @classmethod
    def get_next_batch_id(cls) -> int:
        max_batch = cls.model.objects.aggregate(max_batch=Max("load_batch"))
        return (max_batch["max_batch"] or 0) + 1

    @classmethod
    def get_batches(cls) -> list[dict[str, Any]]:
        return list(
            cls.model.objects.values("load_batch")
            .annotate(count=Count("id"), created_at=Max("created_at"))
            .order_by("-load_batch")
        )


class FormF6Parser(ReportingPeriodParserMixin, BaseExcelParser[FormF6Record]):
    """Парсер Excel файла формы Ф-6 (Возрастная структура оборудования)."""

    ORG_NAME_COLUMN = 0
    OKPO_COLUMN = 1
    OGRN_COLUMN = 2
    INN_COLUMN = 3

    def get_column_mappings(self) -> list[ColumnMapping]:
        return [
            # Категоризация
            ColumnMapping(4, "Код строки", "row_code", field_type="str"),
            ColumnMapping(5, "Категория оборудования", "category", field_type="str"),
            # Общие данные
            ColumnMapping(6, "Всего оборудования", "total_equipment", field_type="int"),
            ColumnMapping(
                7, "Отечественное оборудование", "domestic_equipment", field_type="int"
            ),
            ColumnMapping(
                8, "Импортное оборудование", "imported_equipment", field_type="int"
            ),
            # Возрастная структура
            ColumnMapping(9, "До 5 лет", "age_under_5", field_type="int"),
            ColumnMapping(10, "5-10 лет", "age_5_10", field_type="int"),
            ColumnMapping(11, "10-15 лет", "age_10_15", field_type="int"),
            ColumnMapping(12, "15-20 лет", "age_15_20", field_type="int"),
            ColumnMapping(13, "Свыше 20 лет", "age_over_20", field_type="int"),
            # С ЧПУ
            ColumnMapping(14, "С ЧПУ всего", "cnc_total", field_type="int"),
            ColumnMapping(15, "С ЧПУ до 5 лет", "cnc_under_5", field_type="int"),
            ColumnMapping(16, "С ЧПУ 5-10 лет", "cnc_5_10", field_type="int"),
            ColumnMapping(17, "С ЧПУ 10-15 лет", "cnc_10_15", field_type="int"),
            ColumnMapping(18, "С ЧПУ 15-20 лет", "cnc_15_20", field_type="int"),
            ColumnMapping(19, "С ЧПУ свыше 20 лет", "cnc_over_20", field_type="int"),
            # Показатели
            ColumnMapping(
                20, "Средняя сменность работы", "avg_shift_work", field_type="decimal"
            ),
            ColumnMapping(
                21, "Коэффициент загрузки", "utilization_rate", field_type="decimal"
            ),
            ColumnMapping(
                22, "Физический износ, %", "physical_wear_percent", field_type="decimal"
            ),
            # Потребности
            ColumnMapping(
                23,
                "Рабочие места без оборудования",
                "workplaces_without_equipment",
                field_type="int",
            ),
            ColumnMapping(
                24, "Оборудование к замене", "equipment_to_replace", field_type="int"
            ),
        ]

    def get_next_batch_id(self) -> int:
        return FormF6Service.get_next_batch_id()

    @transaction.atomic
    def create_record(
        self,
        row_data: RowData | dict[str, Any],
        batch_id: int | None = None,
    ) -> FormF6Record:
        row_data = self._normalize_row_data(row_data)
        batch_id = batch_id or getattr(self, "load_batch", self.get_next_batch_id())
        org, _ = OrganizationService.get_or_create_by_inn(
            inn=row_data.inn,
            defaults={
                "name": row_data.organization_name,
                "ogrn": row_data.ogrn or "",
                "okpo": row_data.okpo or "",
                "kpp": row_data.kpp or "",
            },
        )
        return FormF6Service.create_versioned_record(
            organization=org,
            load_batch=batch_id,
            report_year=self.report_year,
            report_quarter=self.report_quarter,
            **row_data.fields,
        )


def parse_form_f6_file(
    file,
    *,
    report_year: int,
    report_quarter: int | None = None,
) -> ParseResult:
    parser = FormF6Parser(report_year=report_year, report_quarter=report_quarter)
    return parser.parse(file)