import logging
import time

import click
from celery import shared_task

from core.rag.index_processor.index_processor_factory import IndexProcessorFactory
from core.rag.models.document import Document
from extensions.ext_database import db
from extensions.ext_redis import redis_client
from libs.datetime_utils import naive_utc_now
from models.dataset import DocumentSegment

logger = logging.getLogger(__name__)


@shared_task(queue="dataset")
def create_segment_to_index_task(segment_id: str, keywords: list[str] | None = None):
    """
    Async create segment to index
    :param segment_id:
    :param keywords:
    Usage: create_segment_to_index_task.delay(segment_id)
    """
    logger.info(click.style(f"Start create segment to index: {segment_id}", fg="green"))
    start_at = time.perf_counter()

    segment = db.session.query(DocumentSegment).where(DocumentSegment.id == segment_id).first()
    if not segment:
        logger.info(click.style(f"Segment not found: {segment_id}", fg="red"))
        db.session.close()
        return

    if segment.status != "waiting":
        db.session.close()
        return

    indexing_cache_key = f"segment_{segment.id}_indexing"

    try:
        # update segment status to indexing
        db.session.query(DocumentSegment).filter_by(id=segment.id).update(
            {
                DocumentSegment.status: "indexing",
                DocumentSegment.indexing_at: naive_utc_now(),
            }
        )
        db.session.commit()
        document = Document(
            page_content=segment.content,
            metadata={
                "doc_id": segment.index_node_id,
                "doc_hash": segment.index_node_hash,
                "document_id": segment.document_id,
                "dataset_id": segment.dataset_id,
            },
        )

        dataset = segment.dataset

        if not dataset:
            logger.info(click.style(f"Segment {segment.id} has no dataset, pass.", fg="cyan"))
            return

        dataset_document = segment.document

        if not dataset_document:
            logger.info(click.style(f"Segment {segment.id} has no document, pass.", fg="cyan"))
            return

        if not dataset_document.enabled or dataset_document.archived or dataset_document.indexing_status != "completed":
            logger.info(click.style(f"Segment {segment.id} document status is invalid, pass.", fg="cyan"))
            return

        index_type = dataset.doc_form
        index_processor = IndexProcessorFactory(index_type).init_index_processor()
        index_processor.load(dataset, [document])

        # update segment to completed
        db.session.query(DocumentSegment).filter_by(id=segment.id).update(
            {
                DocumentSegment.status: "completed",
                DocumentSegment.completed_at: naive_utc_now(),
            }
        )
        db.session.commit()

        end_at = time.perf_counter()
        logger.info(click.style(f"Segment created to index: {segment.id} latency: {end_at - start_at}", fg="green"))
    except Exception as e:
        logger.exception("create segment to index failed")
        segment.enabled = False
        segment.disabled_at = naive_utc_now()
        segment.status = "error"
        segment.error = str(e)
        db.session.commit()
    finally:
        redis_client.delete(indexing_cache_key)
        db.session.close()
