"""LeAudit 任务入口。"""

from __future__ import annotations

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

from fastapi_common.fastapi_common_logger import logger

from fastapi_admin.config import LEAUDIT_RULES_DIR
from fastapi_modules.fastapi_leaudit.leaudit_bridge.nativeRunner import (
    NativeRunRequest,
    NativeRunner,
)
from fastapi_modules.fastapi_leaudit.leaudit_bridge.auditCtxBuilder import (
    NativeAuditMetadata,
)
from fastapi_modules.fastapi_leaudit.leaudit_bridge.ruleVersionResolver import (
    RuleVersionResolver,
)
from fastapi_modules.fastapi_leaudit.leaudit_bridge.rules_loader import RulesLoader
from fastapi_modules.fastapi_leaudit.leaudit_bridge.storage_adapter import StorageAdapter

# Celery 集成待 P2 阶段实现，当前使用同步占位
# from core.celery_app_limited import celery_app

log = logger


# P2: Celery 集成后启用 @celery_app.task 装饰器
def leaudit_process_document(
    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,
):
    """处理单个文档的 LeAudit 任务。"""
    task_id = os.urandom(8).hex()
    log.info(f"[任务ID: {task_id}] leaudit管线开始处理: {filename}")

    # 新平台：region 通过参数传递，不再依赖 os.environ 切换
    if source_port:
        log.info(f"[任务ID: {task_id}] 来源端口: {source_port}")

    if upload_info is None:
        upload_info = {}

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    temp_paths: list[str] = []
    storage = StorageAdapter()

    try:
        run_id = _resolve_run_id(document_id, upload_info, loop)
        rules_resolution = _resolve_rules_runtime(document_id, run_id, rules_path, loop)
        loop.run_until_complete(_update_run_status_safe(run_id, "running"))
        rules_path_resolved = rules_resolution["rules_path"]

        rules_file = None
        if rules_path_resolved:
            loader = RulesLoader()
            rules_file = loader.load(rules_path_resolved)
            temp_rule_path = rules_resolution.get("temp_rule_path")
            if isinstance(temp_rule_path, str):
                temp_paths.append(temp_rule_path)
            log.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.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
        temp_paths.append(temp_path)

        runner = NativeRunner()

        t0 = time.time()
        native_result = loop.run_until_complete(
            runner.run(
                NativeRunRequest(
                    metadata=NativeAuditMetadata(
                        run_id=run_id,
                        document_id=document_id,
                        rule_version_id=_optional_int(upload_info, "rule_version_id", "ruleVersionId"),
                        extras={"taskId": task_id},
                    ),
                    local_file_path=temp_path,
                    rules_file=rules_file,
                    rule_source_path=rules_path_resolved,
                )
            )
        )
        loop.run_until_complete(runner.persist_result(native_result))
        elapsed = round(time.time() - t0, 2)

        ctx = native_result.ctx
        loop.run_until_complete(_update_run_phase_safe(run_id, ctx.phase))
        loop.run_until_complete(_update_run_status_safe(run_id, "completed"))
        loop.run_until_complete(_update_status_safe(document_id, "completed"))
        log.info(
            f"[任务ID: {task_id}] leaudit管线完成: phase={ctx.phase}, "
            f"timing={dict(ctx.timing)}, 总耗时={elapsed:.1f}s"
        )

        return {
            "status": "success",
            "document_id": document_id,
            "run_id": run_id,
            "phase": ctx.phase,
            "timing": dict(ctx.timing),
            "errors": list(ctx.extraction.all_errors) if ctx.extraction is not None else list(ctx.extraction_errors),
        }

    except Exception as e:
        log.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"))
            if 'run_id' in locals():
                failed_phase = "persist"
                if "native_result" in locals():
                    failed_phase = native_result.ctx.phase or failed_phase
                loop.run_until_complete(
                    storage.fail_run(
                        document_id,
                        run_id=run_id,
                        phase=failed_phase,
                        message=str(e),
                        detail_json={
                            "taskId": task_id,
                            "filename": filename,
                            "errorType": type(e).__name__,
                        },
                    )
                )
        except Exception:
            pass
        raise

    finally:
        for temp_path in temp_paths:
            try:
                if Path(temp_path).exists():
                    os.remove(temp_path)
            except OSError:
                pass
        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 fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
    from sqlalchemy import text as sa_text

    # 1. Config override (when explicitly set in app.toml)
    if LEAUDIT_RULES_DIR:
        return LEAUDIT_RULES_DIR

    try:
        async def _fetch():
            async with GetAsyncSession() as session:
                result = await session.execute(
                    sa_text("SELECT type_id FROM leaudit_documents WHERE id = :did"),
                    {"did": document_id},
                )
                row = result.fetchone()
                if row and row[0] and row[0] in _TYPE_ID_RULES_MAP:
                    return f"{_TYPE_ID_RULES_MAP[row[0]]}/rules.yaml"
                return None

        return loop.run_until_complete(_fetch())
    except Exception as e:
        log.warning(f"Failed to resolve rules_path from document: {e}")

    return None


def _resolve_rules_runtime(
    document_id: int,
    run_id: int,
    explicit_rules_path: str | None,
    loop: asyncio.AbstractEventLoop,
) -> dict[str, str | None]:
    """解析本次执行使用的规则来源。"""
    if explicit_rules_path:
        return {
            "rules_path": explicit_rules_path,
            "temp_rule_path": None,
            "source_type": "explicit",
            "source_path": explicit_rules_path,
        }

    resolver = RuleVersionResolver()
    try:
        payload = loop.run_until_complete(resolver.ResolveForRun(run_id))
        if payload:
            log.info(
                f"run_id={run_id} 规则来源已解析: sourceType={payload.sourceType}, "
                f"sourcePath={payload.sourcePath}, localPath={payload.localPath}"
            )
            return {
                "rules_path": payload.localPath,
                "temp_rule_path": payload.localPath if payload.sourceType == "oss" else None,
                "source_type": payload.sourceType,
                "source_path": payload.sourcePath,
            }
    except Exception as e:
        log.warning(f"Failed to resolve rule version from run: run_id={run_id}, error={e}")

    fallback_rules_path = _resolve_rules_path(document_id, loop)
    return {
        "rules_path": fallback_rules_path,
        "temp_rule_path": None,
        "source_type": "legacy_fallback",
        "source_path": fallback_rules_path,
    }


def _resolve_run_id(
    document_id: int,
    upload_info: Dict[str, Any] | None,
    loop: asyncio.AbstractEventLoop,
) -> int:
    """解析本次任务对应的运行 ID。"""
    if upload_info:
        for key in ("run_id", "runId"):
            value = upload_info.get(key)
            if isinstance(value, int):
                return value

    from fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
    from sqlalchemy import text as sa_text

    async def _fetch() -> int:
        async with GetAsyncSession() as session:
            result = await session.execute(
                sa_text("SELECT id FROM leaudit_audit_runs WHERE document_id = :did ORDER BY id DESC LIMIT 1"),
                {"did": document_id},
            )
            row = result.fetchone()
            if not row:
                raise ValueError(f"未找到 document_id={document_id} 对应的 run 记录")
            return int(row[0])

    return loop.run_until_complete(_fetch())


def _optional_int(payload: Dict[str, Any] | None, *keys: str) -> int | None:
    """从字典中按顺序取可用整数。"""
    if not payload:
        return None

    for key in keys:
        value = payload.get(key)
        if isinstance(value, int):
            return value
    return None


async def _update_status_safe(document_id: int, status: str) -> None:
    """Safely update document status via SQLAlchemy, ignoring errors."""
    try:
        from fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
        from sqlalchemy import text as sa_text

        async with GetAsyncSession() as session:
            await session.execute(
                sa_text("UPDATE leaudit_documents SET processing_status = :s, update_time = now() WHERE id = :did"),
                {"s": status, "did": document_id},
            )
            await session.commit()
    except Exception:
        pass


async def _update_run_status_safe(run_id: int, status: str) -> None:
    """安全更新运行状态。"""
    try:
        from fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
        from sqlalchemy import text as sa_text

        async with GetAsyncSession() as session:
            await session.execute(
                sa_text("UPDATE leaudit_audit_runs SET status = :s, update_time = now() WHERE id = :rid"),
                {"s": status, "rid": run_id},
            )
            await session.commit()
    except Exception:
        pass


async def _update_run_phase_safe(run_id: int, phase: str | None) -> None:
    """安全更新运行阶段。"""
    try:
        from fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
        from sqlalchemy import text as sa_text

        async with GetAsyncSession() as session:
            await session.execute(
                sa_text("UPDATE leaudit_audit_runs SET phase = :p, update_time = now() WHERE id = :rid"),
                {"p": phase, "rid": run_id},
            )
            await session.commit()
    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.

    P2: Celery 集成后改用 leaudit_process_document.apply_async(...)
    当前阶段直接同步调用。
    """
    return leaudit_process_document(
        document_id=document_id,
        file_content=file_content,
        filename=filename,
        upload_info=upload_info,
        source_port=source_port or int(os.getenv("APP_PORT", "8000")),
        rules_path=rules_path,
    )