import logging

import pandas as pd
from sqlalchemy.orm import Session
from components.dbo.models.acronym import Acronym
from components.dbo.models.dataset import Dataset
from components.dbo.models.dataset_document import DatasetDocument
from schemas.acronym import AcronymCollectionResponse

logger = logging.getLogger(__name__)

class AcronymService:
    """
    Сервис для работы с аббревиатурами и сокращениями.
    """
    
    def __init__(self, db: Session):
        logger.info("Initializing AcronymService")
        self.db = db

    def from_pandas(self, df: pd.DataFrame) -> None:
        """
        Загрузить аббревиатуры и сокращения из pandas DataFrame.

        Args:
            df: DataFrame со столбцами document_id, short_form, full_form, type
        """
        logger.info(f"Loading acronyms from DataFrame with {len(df)} rows")
        with self.db() as session:
            try:
                # Process each row in the DataFrame
                for _, row in df.iterrows():
                    # Create acronym
                    acronym = Acronym(
                        short_form=row['short_form'],
                        full_form=row['full_form'],
                        type=row['type'],
                        document_id=(
                            int(row['document_id'])
                            if pd.notna(row['document_id'])
                            else None
                        ),
                    )
                    session.add(acronym)

                session.commit()
                logger.info("Successfully loaded all acronyms")

            except Exception as e:
                session.rollback()
                logger.error(f"Error processing acronyms: {str(e)}")
                raise e
            finally:
                session.close()

    def get_abbreviations(self, document_id: int) -> list[Acronym]:
        """
        Получить аббревиатуры и сокращения для документа.
        """
        logger.info(f"Getting abbreviations for document {document_id}")
        with self.db() as session:
            result = (
                session.query(Acronym)
                .filter(
                    (Acronym.document_id == document_id) | (Acronym.document_id == None)
                )
                .all()
            )
        
            logger.debug(f"Found {len(result)} abbreviations for document {document_id}")
            return result

    def get_abbreviations_by_dataset_id(self, dataset_id: int) -> list[Acronym]:
        """
        Получить аббревиатуры и сокращения для документа.
        """
        logger.info(f"Getting abbreviations for dataset {dataset_id}")
        return self._get_acronyms_for_dataset(dataset_id)

    def get_current_acronyms(self) -> AcronymCollectionResponse:
        """
        Получить аббревиатуры и сокращения для текущего активного набора данных.
        """
        logger.info("Getting acronyms for current active dataset")
        with self.db() as session:
            active_dataset: Dataset = session.query(Dataset).filter(Dataset.is_active == True).first()
            
            if not active_dataset:
                logger.warning("No active dataset found")
                
                return AcronymCollectionResponse(
                    collection_id=0,
                    collection_name="",
                    collection_filename="",
                    updated_at=None,
                    acronyms={},
                )
        
        result = self._get_acronyms_for_dataset(active_dataset.id)
        
        return AcronymCollectionResponse(
            collection_id=active_dataset.id,
            collection_name=active_dataset.name,
            collection_filename='',
            updated_at=active_dataset.date_created, #TODO: Что?
            acronyms=self._compress_acronyms(result),
        )

    def _get_acronyms_for_dataset(self, dataset_id: int) -> list[Acronym]:
        """
        Получить список акронимов для датасета.
        
        Args:
            dataset_id: ID датасета
            
        Returns:
            list[Acronym]: Список акронимов
        """
        with self.db() as session:
            try:
                document_ids = (
                    session.query(DatasetDocument.document_id)
                    .filter(DatasetDocument.id == dataset_id)
                    .all()
                )

                result = (
                    session.query(Acronym)
                    .filter(
                        (Acronym.document_id.in_([doc_id[0] for doc_id in document_ids])) | (Acronym.document_id == None)
                    )
                    .all()
                )

                logger.debug(f"Found {len(result)} acronyms for dataset {dataset_id}")
                return result
            finally:
                pass

    def _compress_acronyms(self, acronyms: list[Acronym]) -> dict[str, list[str]]:
        """
        Сжать аббревиатуры и сокращения в словарь.
        """
        short_forms = {acronym.short_form for acronym in acronyms}
        compressed = {
            short_form: [
                acronym.full_form
                for acronym in acronyms
                if acronym.short_form == short_form
            ]
            for short_form in short_forms
        }
        logger.debug(f"Compressed {len(acronyms)} acronyms into {len(compressed)} unique short forms")
        return compressed