# 文件服务接口
from typing import Any

from flask import Request
from werkzeug.utils import secure_filename
import os , time, hashlib
from alibabacloud_sample.dataservice import DataService

dataservice = DataService()

class FileService:
    # 创建文件服务实例
    def __init__(self):
        pass
    # 上传文件
    def upload(self, request: Request, file_path: str) -> None | str | dict[Any, Any] | Any:
        if request.method == 'POST':
            # 检查是否有文件在请求中
            if 'file' not in request.files:
                return '没有文件被上传'
            file = request.files['file']
            if file.filename == '':
                return '请重新选择文件'
            if file:
                date = time.strftime("%Y%m%d", time.localtime())
                filetype = secure_filename(file.filename)
                filename = str(int(time.time())) + "_" + file.filename
                filepath = os.path.join(file_path, date, filename)
                os.makedirs(os.path.dirname(filepath), exist_ok=True)
                file.save(filepath)
                file_size = os.path.getsize(filepath)
                file_hash = self.get_hash(filepath)
                v_file = dataservice.get_file(file_hash,file_size)
                if v_file:
                    os.remove(filepath)
                    return v_file
                else:
                    v_file  = dataservice.insert_file_data(file.filename, filepath, file_size, filetype, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),file_hash)
                    print("insert v_file:", v_file)
                    return v_file
        return None

    #  获取文件md5
    @staticmethod
    def get_hash(file_path: str) -> str:
        with open(file_path, 'rb') as f:
            md5 = hashlib.md5()
            while True:
                data = f.read(8192)
                if not data:
                    break
                md5.update(data)
            return md5.hexdigest()