import logging
import time

import click
from celery import shared_task
from sqlalchemy import delete, select

from core.db.session_factory import session_factory
from core.indexing_runner import DocumentIsPausedError, IndexingRunner
from core.rag.index_processor.index_processor_factory import IndexProcessorFactory
from libs.datetime_utils import naive_utc_now
from models.dataset import Dataset, Document, DocumentSegment

logger = logging.getLogger(__name__)


@shared_task(queue="dataset")
def document_indexing_update_task(dataset_id: str, document_id: str):
    """
    Async update document
    :param dataset_id:
    :param document_id:

    Usage: document_indexing_update_task.delay(dataset_id, document_id)
    """
    logger.info(click.style(f"Start update document: {document_id}", fg="green"))
    start_at = time.perf_counter()

    with session_factory.create_session() as session, session.begin():
        document = session.query(Document).where(Document.id == document_id, Document.dataset_id == dataset_id).first()

        if not document:
            logger.info(click.style(f"Document not found: {document_id}", fg="red"))
            return

        document.indexing_status = "parsing"
        document.processing_started_at = naive_utc_now()

        dataset = session.query(Dataset).where(Dataset.id == dataset_id).first()
        if not dataset:
            return

        index_type = document.doc_form
        segments = session.scalars(select(DocumentSegment).where(DocumentSegment.document_id == document_id)).all()
        index_node_ids = [segment.index_node_id for segment in segments]

    clean_success = False
    try:
        index_processor = IndexProcessorFactory(index_type).init_index_processor()
        if index_node_ids:
            index_processor.clean(dataset, index_node_ids, with_keywords=True, delete_child_chunks=True)
            end_at = time.perf_counter()
            logger.info(
                click.style(
                    "Cleaned document when document update data source or process rule: {} latency: {}".format(
                        document_id, end_at - start_at
                    ),
                    fg="green",
                )
            )
            clean_success = True
    except Exception:
        logger.exception("Failed to clean document index during update, document_id: %s", document_id)

    if clean_success:
        with session_factory.create_session() as session, session.begin():
            segment_delete_stmt = delete(DocumentSegment).where(DocumentSegment.document_id == document_id)
            session.execute(segment_delete_stmt)

    try:
        indexing_runner = IndexingRunner()
        indexing_runner.run([document])
        end_at = time.perf_counter()
        logger.info(click.style(f"update document: {document.id} latency: {end_at - start_at}", fg="green"))
    except DocumentIsPausedError as ex:
        logger.info(click.style(str(ex), fg="yellow"))
    except Exception:
        logger.exception("document_indexing_update_task failed, document_id: %s", document_id)