import oss2
import uuid
import datetime
from django.conf import settings
from urllib.parse import urljoin
import os
import logging

logger = logging.getLogger(__name__)

class OSSUploader:
    """
    通用OSS文件上传工具类
    """
    
    def __init__(self, base_dir='upload'):
        """
        初始化OSS上传器
        
        Args:
            base_dir: 文件存储的基础目录
        """
        self.base_dir = base_dir
        self.access_key_id = settings.AUDIO_SERVICE_CONFIG['aliyun']['oss_key_id']
        self.access_key_secret = settings.AUDIO_SERVICE_CONFIG['aliyun']['oss_key_secret']
        self.bucket_name = settings.AUDIO_SERVICE_CONFIG['aliyun']['oss_bucket']
        self.endpoint = settings.AUDIO_SERVICE_CONFIG['aliyun']['oss_endpoint']
        self.host = settings.AUDIO_SERVICE_CONFIG['aliyun']['oss_host']
        
        # 初始化OSS客户端
        self.auth = oss2.Auth(self.access_key_id, self.access_key_secret)
        self.bucket = oss2.Bucket(self.auth, self.endpoint, self.bucket_name)
    
    def upload_file(self, file_obj, is_permanent=False, filename=None):
        """
        上传文件到OSS
        
        Args:
            file_obj: 文件对象/二进制数据
            is_permanent: 是否永久保存，False表示临时文件
            filename: 自定义文件名，如果为None则生成随机名称
            
        Returns:
            dict: 包含文件URL和OSS Key
        """
        try:
            # 生成今天的日期作为子目录
            today = datetime.datetime.now().strftime('%Y%m%d')
            
            # 确定存储类型目录
            storage_type = 'permanent' if is_permanent else 'temporary'
            
            # 生成文件名
            if not filename:
                # 生成随机文件名
                random_uuid = uuid.uuid4()
                if hasattr(file_obj, 'name'):
                    # 获取原始文件扩展名
                    _, ext = os.path.splitext(file_obj.name)
                    file_name = f"{random_uuid}{ext}"
                else:
                    file_name = f"{random_uuid}"
            else:
                file_name = filename
            
            # 构建OSS路径
            oss_key = f"{self.base_dir}/{storage_type}/{today}/{file_name}"
            
            # 上传文件
            if hasattr(file_obj, 'read'):
                content = file_obj.read()
                self.bucket.put_object(oss_key, content)
            else:
                # 假设file_obj是二进制数据
                self.bucket.put_object(oss_key, file_obj)
            
            # 生成URL
            file_url = urljoin(self.host, oss_key)
            
            logger.info(f"File uploaded to OSS: {oss_key}")
            
            return {
                'url': file_url,
                'key': oss_key,
                'is_permanent': is_permanent
            }
            
        except Exception as e:
            logger.error(f"Error uploading file to OSS: {str(e)}")
            raise