import datetime
import logging
import time

import click
from celery import shared_task

from core.indexing_runner import IndexingRunner
from core.rag.index_processor.index_processor_factory import IndexProcessorFactory
from extensions.ext_database import db
from extensions.ext_redis import redis_client
from models.dataset import Dataset, Document, DocumentSegment
from services.feature_service import FeatureService


@shared_task(queue='dataset')
def retry_document_indexing_task(dataset_id: str, document_id: str):
    """
    Async process document
    :param dataset_id:
    :param document_id:

    Usage: retry_document_indexing_task.delay(dataset_id, document_id)
    """
    documents = []
    start_at = time.perf_counter()

    dataset = db.session.query(Dataset).filter(Dataset.id == dataset_id).first()
    retry_indexing_cache_key = 'document_{}_is_retried'.format(document_id)
    # check document limit
    features = FeatureService.get_features(dataset.tenant_id)
    try:
        if features.billing.enabled:
            vector_space = features.vector_space
            if 0 < vector_space.limit <= vector_space.size:
                raise ValueError("Your total number of documents plus the number of uploads have over the limit of "
                                 "your subscription.")
    except Exception as e:
        document = db.session.query(Document).filter(
            Document.id == document_id,
            Document.dataset_id == dataset_id
        ).first()
        if document:
            document.indexing_status = 'error'
            document.error = str(e)
            document.stopped_at = datetime.datetime.utcnow()
            db.session.add(document)
            db.session.commit()
        redis_client.delete(retry_indexing_cache_key)
        return

    logging.info(click.style('Start retry document: {}'.format(document_id), fg='green'))
    try:
        document = db.session.query(Document).filter(
            Document.id == document_id,
            Document.dataset_id == dataset_id
        ).first()

        if document:
            # clean old data
            index_processor = IndexProcessorFactory(document.doc_form).init_index_processor()

            segments = db.session.query(DocumentSegment).filter(DocumentSegment.document_id == document_id).all()
            if segments:
                index_node_ids = [segment.index_node_id for segment in segments]
                # delete from vector index
                index_processor.clean(dataset, index_node_ids)

                for segment in segments:
                    db.session.delete(segment)
                db.session.commit()

            document.indexing_status = 'parsing'
            document.processing_started_at = datetime.datetime.utcnow()
            documents.append(document)
            db.session.add(document)
            db.session.commit()

            indexing_runner = IndexingRunner()
            indexing_runner.run(documents)
            end_at = time.perf_counter()
            redis_client.delete(retry_indexing_cache_key)
            logging.info(click.style('Retry dataset: {} latency: {}'.format(dataset_id, end_at - start_at), fg='green'))
    except Exception as ex:
        logging.info(click.style(str(ex), fg='yellow'))
        redis_client.delete(retry_indexing_cache_key)
        pass
