"""Celery task for leaudit pipeline processing.

Activated when PIPELINE_MODE=leaudit in env.{port} config.
Replaces the legacy OCR → extraction → evaluation pipeline with
leaudit's YAML-rules-driven approach.
"""

from __future__ import annotations

import asyncio
import os
import tempfile
import time
from typing import Any, Dict, Optional

from core.celery_app_limited import celery_app
from core.postgrest.client import get_postgrest_client
from core.logger import log

from leaudit_bridge import create_pipeline, RulesLoader


@celery_app.task(bind=True, name="leaudit.process_document")
def leaudit_process_document(
    self,
    document_id: int,
    file_content: bytes,
    filename: str,
    upload_info: Optional[Dict[str, Any]] = None,
    source_port: Optional[int] = None,
    rules_path: Optional[str] = None,
):
    """Process a document using leaudit's full pipeline.

    Steps: OCR → Extraction → Evaluation → Store in docauditai DB.
    """
    task_id = self.request.id
    log.task.info(f"[任务ID: {task_id}] leaudit管线开始处理: {filename}")

    if source_port:
        from core.utils.instance_context import set_instance_environment
        instance_name = set_instance_environment(source_port)
        log.task.info(
            f"[任务ID: {task_id}] 实例环境: {instance_name} (端口: {source_port})"
        )

    if upload_info is None:
        upload_info = {}

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)

    try:
        rules_path_resolved = rules_path or _resolve_rules_path(document_id, loop)

        # For types with a known mapping (e.g. 行政处罚), pre-load rules_file.
        # For types that need content classification (e.g. 行政许可 sub-types),
        # rules_path will be None → adapter classifies after OCR → pipeline
        # loads rules from ocr_result.rules_file_path.
        rules_file = None
        if rules_path_resolved:
            loader = RulesLoader()
            rules_file = loader.load(rules_path_resolved)
            log.task.info(
                f"[任务ID: {task_id}] RulesFile pre-loaded: {rules_path_resolved} "
                f"({len(rules_file.flat_rules)} rules, {len(rules_file.flat_extract)} fields)"
            )
        else:
            log.task.info(
                f"[任务ID: {task_id}] No fixed rules_path — "
                "will classify from document content after OCR"
            )

        suffix = _get_suffix(filename)
        with tempfile.NamedTemporaryFile(suffix=suffix, delete=False) as temp:
            temp.write(file_content)
            temp_path = temp.name

        pipeline = create_pipeline(rules_path=rules_path_resolved)

        t0 = time.time()
        result = loop.run_until_complete(
            pipeline.run(
                document_id=document_id,
                file_path=temp_path,
                rules_file=rules_file,
                source_port=source_port or int(os.getenv("APP_PORT", "8000")),
            )
        )
        elapsed = round(time.time() - t0, 2)

        try:
            os.remove(temp_path)
        except OSError:
            pass

        log.task.info(
            f"[任务ID: {task_id}] leaudit管线完成: phase={result.detected_phase}, "
            f"timing={result.timing}, 总耗时={elapsed:.1f}s"
        )

        return {
            "status": "success",
            "document_id": document_id,
            "phase": result.detected_phase,
            "timing": result.timing,
            "errors": result.errors,
        }

    except Exception as e:
        log.task.error(f"[任务ID: {task_id}] leaudit管线失败: {e}", exc_info=True)
        try:
            loop.run_until_complete(_update_status_safe(document_id, "Failed"))
        except Exception:
            pass
        raise

    finally:
        loop.close()


# type_id → rules directory mapping (only fixed-mapping types)
# 行政许可 (type_id=2) has 9 sub-types, NOT mapped here —
# must come from document metadata (rules_file_path) or content classification.
_TYPE_ID_RULES_MAP: dict[int, str] = {
    3: "行政处罚",
}


def _resolve_rules_path(document_id: int, loop: asyncio.AbstractEventLoop) -> str | None:
    """Resolve rules_path: config override → document metadata → type_id mapping."""
    from core.config import LEAUDIT_CONFIG

    # 1. Config override (when explicitly set)
    config_path = LEAUDIT_CONFIG.get("RULES_PATH", "")
    if config_path:
        return config_path

    try:
        client = get_postgrest_client()
        doc = loop.run_until_complete(
            client.select(
                table="documents",
                filters={"id": f"eq.{document_id}"},
                single=True,
            )
        )
        if not doc:
            return None

        # 2. Document-level override
        rfp = doc.get("rules_file_path")
        if rfp:
            return rfp

        # 3. type_id mapping
        type_id = doc.get("type_id")
        if type_id and type_id in _TYPE_ID_RULES_MAP:
            return f"{_TYPE_ID_RULES_MAP[type_id]}/rules.yaml"
    except Exception as e:
        log.task.warning(f"Failed to resolve rules_path from document: {e}")

    return None


async def _update_status_safe(document_id: int, status: str) -> None:
    """Safely update document status, ignoring errors."""
    try:
        client = get_postgrest_client()
        await client.update(
            table="documents",
            filters={"id": f"eq.{document_id}"},
            data={"status": status},
        )
    except Exception:
        pass


def _get_suffix(filename: str) -> str:
    """Extract file suffix from filename."""
    _, ext = os.path.splitext(filename)
    return ext if ext else ".pdf"


def dispatch_leaudit_task(
    document_id: int,
    file_content: bytes,
    filename: str,
    upload_info: Optional[Dict[str, Any]] = None,
    source_port: Optional[int] = None,
    rules_path: Optional[str] = None,
):
    """Dispatch a leaudit processing task."""
    return leaudit_process_document.apply_async(
        args=[document_id, file_content, filename],
        kwargs={
            "upload_info": upload_info,
            "source_port": source_port or int(os.getenv("APP_PORT", "8000")),
            "rules_path": rules_path,
        },
    )