#!/usr/bin/python3

import pyudev
import psutil
import time
import os

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by("block")

AUTO_MOUNT = True


def printDeviceInfo(dev):
    print("")
    print("<BLOCK INFORMATION>")
    print("Device name: %s" % dev.get("DEVNAME"))
    print("Device type: %s" % dev.get("DEVTYPE"))
    print("Bus system: %s" % dev.get("ID_BUS"))
    print("Partition label: %s" % dev.get("ID_FS_LABEL"))
    print("FS: %s" % dev.get("ID_FS_SYSTEM_ID"))
    print("FS type: %s" % dev.get("ID_FS_TYPE"))
    print("Device usage: %s" % dev.get("ID_FS_USAGE"))
    print("Device model: %s" % dev.get("ID_MODEL"))
    print("Partition type: %s" % dev.get("ID_PART_TABLE_TYPE"))
    print("USB driver: %s" % dev.get("ID_USB_DRIVER"))
    print("Path id: %s" % dev.get("ID_PATH"))
    print('Usage: %s' % dev.get("ID_FS_USAGE"))
    print('Serial short: %s' % dev.get("ID_SERIAL_SHORT"))
    print('Serial: %s' % dev.get("ID_SERIAL"))
    print('Model: %s' % dev.get("ID_MODEL_ID"))
    print(os.stat(dev.get("DEVNAME")))
    print("</BLOCK INFORMATION>")
    print("")


# enumerate at device connection
for device in iter(monitor.poll, None):
    if device.get("ID_FS_USAGE") == "filesystem" and device.device_node[5:7] == "sd":
        if device.action == "add":
            printDeviceInfo(device)
            print("New device {}".format(device.device_node))
            # loop until device is mounted
            if AUTO_MOUNT:
                found = False
                loop = 0
                while (not found) and (loop < 10):
                    # need to sleep before devide is mounted
                    time.sleep(1)
                    for partition in psutil.disk_partitions():
                        if partition.device == device.device_node:
                            print("Mounted at {}".format(partition.mountpoint))
                            statvfs=os.statvfs(partition.mountpoint)
                            print("size %4.1fGB"% (statvfs.f_frsize * statvfs.f_blocks // 1024 // 1024 / 1024))
                            print("used %4.1fGB"% (statvfs.f_frsize * (statvfs.f_blocks - statvfs.f_bfree)  // 1024 // 1024 / 1024))
                            found = True
                    loop += 1
            else:
                print("mount device to /media/box")
                res = os.system("pmount " + device.device_node + " box")
                print("Return type: ", res)

        if device.action == "remove":
            print("Device removed")
            if not AUTO_MOUNT:
                print("unmount device /media/box")
                res = os.system("pumount /media/box")
                print("Return type: ", res)