import uuid
from datetime import datetime, timezone
from typing import Optional

import oss2

from app.config import settings
from app.utils.logger import logger


class OSSStorage:
    def __init__(self):
        self.bucket = None
        self._init_bucket()

    def _init_bucket(self):
        if not settings.oss.access_key_id or not settings.oss.bucket_name:
            logger.warning("OSS配置不完整，将使用本地存储")
            return

        try:
            auth = oss2.Auth(settings.oss.access_key_id, settings.oss.access_key_secret)
            self.bucket = oss2.Bucket(auth, settings.oss.endpoint, settings.oss.bucket_name)
            logger.info(f"OSS连接成功: {settings.oss.bucket_name}")
        except Exception as e:
            logger.error(f"OSS连接失败: {e}")
            self.bucket = None

    def upload_image(self, image_data: bytes, filename: Optional[str] = None) -> str:
        if not self.bucket:
            return self._upload_local(image_data, filename)

        if filename is None:
            timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
            unique_id = uuid.uuid4().hex[:8]
            ext = ".jpg"
            filename = f"alerts/{timestamp}_{unique_id}{ext}"

        try:
            self.bucket.put_object(filename, image_data)
            url = f"{settings.oss.url_prefix}/{filename}"
            logger.info(f"图片上传OSS成功: {url}")
            return url
        except Exception as e:
            logger.error(f"图片上传OSS失败: {e}")
            return self._upload_local(image_data, filename)

    def _upload_local(self, image_data: bytes, filename: Optional[str] = None) -> str:
        upload_dir = Path("uploads")
        upload_dir.mkdir(exist_ok=True)

        if filename is None:
            timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
            unique_id = uuid.uuid4().hex[:8]
            filename = f"alerts/{timestamp}_{unique_id}.jpg"

        file_path = upload_dir / filename
        file_path.parent.mkdir(parents=True, exist_ok=True)

        with open(file_path, "wb") as f:
            f.write(image_data)

        local_url = f"/uploads/{filename}"
        logger.info(f"图片保存本地: {local_url}")
        return local_url

    def get_url(self, path: str) -> str:
        if path.startswith("http"):
            return path
        if self.bucket:
            return f"{settings.oss.url_prefix}/{path}"
        return f"/uploads/{path}" if not path.startswith("/") else path


oss_storage = OSSStorage()


def get_oss_storage() -> OSSStorage:
    return oss_storage