#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Bilibili Screenshots Syncer

It can download `/Pictures/bili/screenshot` from a Android phone via ftp.
It also rename the picture so the timestamp comes first.
"""
from __future__ import print_function
import argparse
from ftplib import FTP
import glob
import re
import os
import subprocess

try:
    input = raw_input
except NameError:
    pass


# -r: Is for recursively download.
# -np: Is for no parent ascending.
# -nH: Is for disabling creation of directory having name same as URL i.e. abc.xyz.com
# --cut-dirs: Is for ignoring number of parent directories. e.g. Pictures/bili/screenshot/*.png has 3 parent dirs
# -N: Is for skiping existing files
WGET_CMD = "wget  -r -N -np -nH --cut-dirs=2 ftp://{ip}:{port}/Pictures/bili/screenshot"


def download_pics(ip, port):
    cmd = WGET_CMD.format(ip=ip, port=port)
    subprocess.call(cmd, shell=True)


def rename_file():
    pic_paths = glob.glob('screenshot/*.png')
    for path in pic_paths:
        new_path = re.sub(r"(\d+)@(\d+)@(.*.png)", r"\g<2>_\g<1>_\g<3>", path)
        os.rename(path, new_path)

def yes_no(question_to_be_answered):
    while True:
        choice = input(question_to_be_answered  + ' [y/n]: ').lower()
        if choice[:1] == 'y':
            return True
        elif choice[:1] == 'n':
            return False
        else:
            print("Please respond with 'Yes' or 'No'\n")

def delete_remote(ip, port):
    ftp = FTP()
    ftp.connect(ip, port)
    ftp.login()
    if yes_no('Delete the remote dir /Pictures/bili/screenshot?'):
        ftp.rmd('/Pictures/bili/screenshot')


def main():
    parser = argparse.ArgumentParser(description='Bilibili Screenshots Syncer')
    parser.add_argument('ip', help='FTP server IP')
    parser.add_argument('--port', default=2121, type=int, help='FTP server port')
    args = parser.parse_args()

    download_pics(args.ip, args.port)
    rename_file()
    delete_remote(args.ip, args.port)


if __name__ == '__main__':
    main()