# -*- coding: utf-8 -*-
 
# 
# 开线程检测文件夹大小，超过指定大小，则按文件最后修改时间排序并删除一部分旧图片
# 在线程里每隔一段时间检测一次
#
 
import os
import threading
import time
 
 
#文件按最后修改时间排序
def get_file_list(file_path):
  dir_list = os.listdir(file_path)
  if not dir_list:
    return
  else:
    dir_list = sorted(dir_list, key=lambda x: os.path.getmtime(os.path.join(file_path, x)))
    #print(dir_list)
    return dir_list
 
#获取文件夹大小
def get_size(file_path):
    totalsize=0
    for filename in os.listdir(file_path):
        totalsize=totalsize+os.path.getsize(os.path.join(file_path, filename))
    #print(totalsize / 1024 / 1024)
    return totalsize / 1024 / 1024
 
# 1文件目录   2文件夹最大大小(M)   3超过后要删除的大小(M)
def detect_file_size(file_path, size_Max, size_Del):
    print(get_size(file_path))
    if get_size(file_path) > size_Max:
        fileList = get_file_list(file_path)
        for i in range(len(fileList)):
            if get_size(file_path) > (size_Max - size_Del):
                print ("del :%d %s" % (i + 1, fileList[i]))
                os.remove(file_path + fileList[i])
    
 
#检测线程，每个5秒检测一次
def detectPicSize():
    while True:
        print('======detect============')
        detect_file_size("../pic/", 30, 5)
        time.sleep(5)
  
if __name__ == "__main__":
    #创建检测线程
    detect_thread = threading.Thread(target = detectPicSize)
    detect_thread.start()