# backend/app/services/file_service.py
import os
import shutil
import uuid
from fastapi import UploadFile, HTTPException, status

class FileService:
    def __init__(self, upload_dir: str):
        self.upload_dir = upload_dir
        os.makedirs(upload_dir, exist_ok=True)
    
    def save_uploaded_file(self, file: UploadFile) -> tuple[str, str]:
        """保存上传的文件"""
        if not file.filename.endswith('.py'):
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="只支持.py文件"
            )
        
        filename = f"{uuid.uuid4().hex}_{file.filename}"
        file_path = os.path.join(self.upload_dir, filename)
        
        with open(file_path, "wb") as buffer:
            shutil.copyfileobj(file.file, buffer)
        
        return filename, file_path
    
    def save_code_content(self, code_content: str, name: str) -> tuple[str, str]:
        """保存代码内容为文件"""
        filename = f"{uuid.uuid4().hex}_{name.replace(' ', '_')}.py"
        file_path = os.path.join(self.upload_dir, filename)
        
        with open(file_path, 'w', encoding='utf-8') as f:
            f.write(code_content)
        
        return filename, file_path
    
    def read_file_content(self, file_path: str) -> str:
        """读取文件内容"""
        with open(file_path, 'r', encoding='utf-8') as f:
            return f.read()
    
    def delete_file(self, file_path: str):
        """删除文件"""
        if os.path.exists(file_path):
            os.remove(file_path)