"""Document ingestion worker pipeline."""

import asyncio
import json
import shutil
from datetime import datetime
from pathlib import Path
from typing import Any, Dict

from backend.paths import org_documents_dir, org_qmd_root, write_folder_project_meta
from src.config import load_config, resolve_opencode_credentials
from src.ingest.classify import classify_document
from src.ingest.formatter import format_global_index_document, format_index_document
from src.ingest.router import extract_document, is_extractable
from src.ingest.stub_writer import write_stub
from src.rag.qmd.indexer import qmd_index_document


async def process_document_ingest(job: Dict[str, Any], tasks: dict, send_progress):
    task_id = job["task_id"]
    file_path = Path(job["file_path"])
    org_slug = job["org_slug"]
    project_slug = job["project_slug"]
    doc_type = job.get("doc_type", "other")
    display_name = job.get("display_name", file_path.name)

    tasks[task_id].update({"status": "processing", "message": "Извлечение текста...", "progress": 10})
    await send_progress(task_id, 10, "Извлечение текста...", "processing")

    try:
        config = load_config()
        ingest_cfg = config.get("ingest", {})
        pdf_ocr = ingest_cfg.get("pdf_ocr", True)

        documents_dir = org_documents_dir(org_slug)
        output_dir = documents_dir / f"doc_{datetime.now().strftime('%Y%m%d_%H%M%S')}_{task_id[-8:]}"
        await asyncio.to_thread(output_dir.mkdir, parents=True, exist_ok=True)

        original_dest = output_dir / file_path.name
        await asyncio.to_thread(shutil.copy2, file_path, original_dest)
        await asyncio.to_thread(write_folder_project_meta, output_dir, project_slug)

        if is_extractable(file_path.name):
            doc = await asyncio.to_thread(
                extract_document,
                file_path,
                project_slug,
                doc_type,
                None,
                pdf_ocr,
            )
            if not doc.full_text.strip():
                raise ValueError("Не удалось извлечь текст из документа")
            await asyncio.to_thread(
                (output_dir / "extracted.md").write_text,
                doc.full_text,
                encoding="utf-8",
            )
        else:
            try:
                stub = await asyncio.to_thread(
                    write_stub, file_path, project_slug
                )
                print(f"[Ingest] {task_id}: создан stub {stub.name}")
            except (FileNotFoundError, OSError) as exc:
                print(f"[Ingest] {task_id}: stub_writer failed: {exc}")
            doc = type("StubDoc", (), {})()
            doc.full_text = ""
            doc.document_id = output_dir.name
            doc.filename = file_path.name
            doc.doc_type = doc_type
            doc.metadata = {}
            doc.to_metadata_dict = lambda: {
                "document_id": doc.document_id,
                "filename": doc.filename,
                "doc_type": doc.doc_type,
                "project": project_slug,
                "stub": True,
            }

        tasks[task_id].update({"status": "postprocessing", "message": "Анализ документа...", "progress": 40})
        await send_progress(task_id, 40, "Анализ документа...", "postprocessing")

        metadata = doc.to_metadata_dict() if callable(getattr(doc, "to_metadata_dict", None)) else {}
        rag_cfg = config.get("rag", {})
        api_key, base_url = resolve_opencode_credentials(config)

        if api_key and ingest_cfg.get("auto_classify", True) and doc.full_text:
            metadata = await classify_document(
                text=doc.full_text,
                project=project_slug,
                doc_type_hint=doc_type,
                api_key=api_key,
                base_url=base_url,
                model=rag_cfg.get("index_model", "mimo-v2.5-free"),
                chunk_size=int(rag_cfg.get("classify_chunk_size", 7000)),
            )
            metadata["filename"] = doc.filename
            metadata["document_id"] = doc.document_id

        await asyncio.to_thread(
            (output_dir / "metadata.json").write_text,
            json.dumps(metadata, ensure_ascii=False, indent=2),
            encoding="utf-8",
        )

        if doc.full_text:
            doc_text = format_index_document(doc, metadata)
            index_path = output_dir / "index.txt"
            await asyncio.to_thread(index_path.write_text, doc_text, encoding="utf-8")
        else:
            doc_text = ""
            index_path = None

        result_data = {
            "document_id": getattr(doc, "document_id", output_dir.name),
            "dir": str(output_dir),
            "rel_dir": str(output_dir.relative_to(documents_dir)),
            "extracted": str(output_dir / "extracted.md") if (output_dir / "extracted.md").exists() else None,
            "index": str(index_path) if index_path else None,
            "project": project_slug,
            "doc_type": metadata.get("doc_type", doc_type),
            "kind": "document",
        }

        if rag_cfg.get("enabled", False) and rag_cfg.get("auto_index", True):
            tasks[task_id].update({"message": "Индексация в qmd...", "progress": 75})
            await send_progress(task_id, 75, "Индексация в qmd...", "postprocessing")
            try:
                await qmd_index_document(
                    org_slug=org_slug,
                    project_slug=project_slug,
                    document_dir=output_dir,
                    extracted_md=output_dir / "extracted.md",
                )
            except Exception as idx_exc:
                print(f"[Ingest] {task_id}: qmd index failed: {idx_exc}")

        from backend.queue import _cleanup_upload
        await asyncio.to_thread(_cleanup_upload, file_path)

        tasks[task_id].update({
            "status": "completed",
            "progress": 100,
            "message": "Документ проиндексирован",
            "result": result_data,
            "finished": datetime.now().isoformat(),
        })
        await send_progress(task_id, 100, "Документ проиндексирован", "completed", result=result_data)

    except Exception as e:
        error_msg = str(e)
        tasks[task_id].update({
            "status": "error",
            "message": f"Ошибка: {error_msg}",
            "error": error_msg,
        })
        await send_progress(task_id, 0, f"Ошибка: {error_msg}", "error", error=error_msg)