"""
阿里云 OSS 工具模块
用于上传文件到 OSS 并生成访问链接
"""

import oss2
import os
from datetime import datetime
from typing import Optional
from loguru import logger


class OSSUploader:
    """OSS 文件上传器"""

    def __init__(
        self,
        access_key_id: str = None,
        access_key_secret: str = None,
        bucket_name: str = None,
        endpoint: str = None,
    ):
        """
        初始化 OSS 上传器

        Args:
            access_key_id: 阿里云 AccessKey ID
            access_key_secret: 阿里云 AccessKey Secret
            bucket_name: OSS Bucket 名称
            endpoint: OSS 区域 Endpoint
        """
        # 从环境变量或参数获取配置
        self.access_key_id = access_key_id or os.getenv("OSS_ACCESS_KEY_ID")
        self.access_key_secret = access_key_secret or os.getenv("OSS_ACCESS_KEY_SECRET")
        self.bucket_name = bucket_name or os.getenv("OSS_BUCKET_NAME", "value-investing")
        self.endpoint = endpoint or os.getenv("OSS_ENDPOINT", "https://oss-cn-wulanchabu.aliyuncs.com")

        self.bucket = None
        self._init_bucket()

    def _init_bucket(self):
        """初始化 OSS Bucket"""
        if not all([self.access_key_id, self.access_key_secret, self.bucket_name, self.endpoint]):
            logger.warning("OSS 配置不完整，无法初始化")
            return

        try:
            auth = oss2.Auth(self.access_key_id, self.access_key_secret)
            self.bucket = oss2.Bucket(auth, self.endpoint, self.bucket_name)
            logger.info(f"OSS Bucket 初始化成功: {self.bucket_name}")
        except Exception as e:
            logger.error(f"OSS Bucket 初始化失败: {e}")
            self.bucket = None

    def upload_file(
        self,
        local_path: str,
        oss_key: str = None,
        expire_seconds: int = 3600 * 24 * 7,  # 默认7天有效期
    ) -> Optional[str]:
        """
        上传文件到 OSS

        Args:
            local_path: 本地文件路径
            oss_key: OSS 中的目标路径，如果不指定则自动生成
            expire_seconds: 预签名URL有效期（秒）

        Returns:
            str: 可访问的 URL，失败返回 None
        """
        if not self.bucket:
            logger.error("OSS Bucket 未初始化")
            return None

        if not os.path.exists(local_path):
            logger.error(f"本地文件不存在: {local_path}")
            return None

        try:
            # 自动生成 OSS 路径
            if not oss_key:
                file_name = os.path.basename(local_path)
                date_str = datetime.now().strftime("%Y%m%d")
                oss_key = f"etf-signals/{date_str}/{file_name}"

            # 上传文件
            self.bucket.put_object_from_file(oss_key, local_path)
            logger.info(f"文件上传成功: {local_path} -> {oss_key}")

            # 生成预签名 URL
            url = self.bucket.sign_url("GET", oss_key, expire_seconds)
            return url

        except Exception as e:
            logger.error(f"文件上传失败: {e}")
            return None

    def upload_image(
        self,
        image_path: str,
        expire_days: int = 7,
    ) -> Optional[str]:
        """
        上传图片到 OSS（专门用于钉钉通知）

        Args:
            image_path: 图片文件路径
            expire_days: URL 有效期（天）

        Returns:
            str: 图片访问 URL
        """
        if not os.path.exists(image_path):
            logger.error(f"图片文件不存在: {image_path}")
            return None

        # 生成带时间戳的 OSS 路径
        file_name = os.path.basename(image_path)
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        oss_key = f"etf-charts/{timestamp}_{file_name}"

        return self.upload_file(image_path, oss_key, expire_days * 24 * 3600)

    def delete_file(self, oss_key: str) -> bool:
        """
        删除 OSS 文件

        Args:
            oss_key: OSS 文件路径

        Returns:
            bool: 是否删除成功
        """
        if not self.bucket:
            logger.error("OSS Bucket 未初始化")
            return False

        try:
            self.bucket.delete_object(oss_key)
            logger.info(f"文件删除成功: {oss_key}")
            return True
        except Exception as e:
            logger.error(f"文件删除失败: {e}")
            return False


# 全局单例
_oss_uploader: Optional[OSSUploader] = None


def get_oss_uploader() -> OSSUploader:
    """获取 OSS 上传器单例"""
    global _oss_uploader
    if _oss_uploader is None:
        _oss_uploader = OSSUploader()
    return _oss_uploader


def upload_image_to_oss(image_path: str, expire_days: int = 7) -> Optional[str]:
    """
    便捷函数：上传图片到 OSS

    Args:
        image_path: 图片路径
        expire_days: URL 有效期（天）

    Returns:
        str: 图片访问 URL
    """
    uploader = get_oss_uploader()
    return uploader.upload_image(image_path, expire_days)