#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
缓存管理模块 - 提供统一的缓存文件路径管理和操作接口

使用方式：
    from foundation.observability.cachefiles import cache, CacheBaseDir

    # 保存数据（必须指定根目录，文件名自动使用变量名）
    catogues_result = {"key": "value"}
    cache.document_temp(catogues_result, base_cache_dir=CacheBaseDir.CONSTRUCTION_REVIEW)
    # → temp/construction_review/document_temp/catogues_result.json

    cache.document_temp(catogues_result, base_cache_dir=CacheBaseDir.CONSTRUCTION_WRITE)
    # → temp/construction_write/document_temp/catogues_result.json
"""

from __future__ import annotations

import inspect
import json
from enum import Enum
from pathlib import Path
from typing import Any, Optional, Union
import pandas as pd

from foundation.observability.logger.loggering import review_logger as logger


class CacheBaseDir(str, Enum):
    """缓存主目录枚举"""
    CONSTRUCTION_REVIEW = "temp/construction_review"
    CONSTRUCTION_WRITE = "temp/construction_write"
    RAG_MONITORING = "temp/rag_monitoring"


class _SubDirCaller:
    """子目录调用器"""

    def __init__(self, subdir: str):
        self.subdir = subdir

    def __call__(
        self,
        data: Any,
        base_cache_dir: Union[str, CacheBaseDir],
    ) -> Path:
        """
        保存数据，文件名自动使用变量名

        Args:
            data: 要保存的数据
            base_cache_dir: 缓存根目录（必须指定）
        """
        filename = self._get_var_name(data)
        return cache.save(data, self.subdir, filename, base_cache_dir)

    def _get_var_name(self, data: Any) -> str:
        """获取变量名"""
        # 获取调用者的帧
        frame = inspect.currentframe()
        try:
            # 回退两帧：_get_var_name -> __call__ -> 实际调用处
            caller_frame = frame.f_back.f_back
            caller_locals = caller_frame.f_locals

            # 在locals中找到值为data的变量名
            for name, value in caller_locals.items():
                if value is data:
                    return name

            # 找不到则返回默认名
            return "data"
        finally:
            del frame


class CacheManager:
    """全局缓存管理器（单例）"""

    _instance: Optional["CacheManager"] = None

    def __new__(cls) -> "CacheManager":
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            cls._instance._initialized = False
        return cls._instance

    def __init__(self):
        if self._initialized:
            return
        self._initialized = True
        from .cache_files import SUBDIRS
        self._subdirs = SUBDIRS
        self._ensure_directories()

    def _ensure_directories(self):
        """确保缓存目录存在"""
        for base_dir in CacheBaseDir:
            Path(base_dir.value).mkdir(parents=True, exist_ok=True)

        base = Path(CacheBaseDir.CONSTRUCTION_REVIEW.value)
        for subdir in self._subdirs.values():
            (base / subdir).mkdir(parents=True, exist_ok=True)

        logger.info("[缓存] 缓存目录已初始化")

    def __getattr__(self, subdir: str) -> _SubDirCaller:
        """访问子目录"""
        if subdir in self._subdirs:
            return _SubDirCaller(self._subdirs[subdir])
        raise AttributeError(
            f"'CacheManager' has no subdir '{subdir}'. "
            f"Available: {list(self._subdirs.keys())}"
        )

    def save(
        self,
        data: Any,
        subdir: str,
        filename: str,
        base_cache_dir: Union[str, CacheBaseDir] = CacheBaseDir.CONSTRUCTION_REVIEW,
    ) -> Path:
        """保存数据"""
        if isinstance(base_cache_dir, CacheBaseDir):
            base = Path(base_cache_dir.value)
        else:
            base = Path(base_cache_dir)
        filepath = base / subdir / filename
        filepath.parent.mkdir(parents=True, exist_ok=True)

        if isinstance(data, pd.DataFrame):
            data.to_csv(filepath, index=False, encoding='utf-8-sig')
        elif isinstance(data, (dict, list)):
            with open(filepath, 'w', encoding='utf-8') as f:
                json.dump(data, f, ensure_ascii=False, indent=2)
        elif isinstance(data, str):
            with open(filepath, 'w', encoding='utf-8') as f:
                f.write(data)
        else:
            raise TypeError(f"不支持的数据类型: {type(data)}")

        logger.debug(f"[缓存] 已保存: {filepath}")
        return filepath

    def load(
        self,
        subdir: str,
        filename: str,
        base_cache_dir: Union[str, CacheBaseDir] = CacheBaseDir.CONSTRUCTION_REVIEW,
        default: Any = None,
    ) -> Any:
        """加载数据"""
        if isinstance(base_cache_dir, CacheBaseDir):
            base = Path(base_cache_dir.value)
        else:
            base = Path(base_cache_dir)
        filepath = base / subdir / filename

        if not filepath.exists():
            return default

        ext = filepath.suffix.lower()
        if ext == '.csv':
            return pd.read_csv(filepath, encoding='utf-8-sig')
        elif ext == '.json':
            with open(filepath, 'r', encoding='utf-8') as f:
                return json.load(f)
        elif ext in ['.txt', '.log', '.md']:
            with open(filepath, 'r', encoding='utf-8') as f:
                return f.read()
        else:
            raise ValueError(f"不支持的文件类型: {ext}")


# 全局单例
cache = CacheManager()