""" Download image according to given urls and automatically rename them in order. """
# -*- coding: utf-8 -*-
# author: Yabin Zheng
# Email: sczhengyabin@hotmail.com

from __future__ import print_function

import shutil
import imghdr
import os
import concurrent.futures
import requests

headers = {
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
    "Proxy-Connection": "keep-alive",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
                  "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
    "Accept-Encoding": "gzip, deflate, sdch",
    # 'Connection': 'close',
}


def download_image(image_url, dst_dir, file_name, timeout=20, proxy_type=None, proxy=None):
    proxies = None
    if proxy_type is not None:
        proxies = {
            "http": proxy_type + "://" + proxy,
            "https": proxy_type + "://" + proxy
        }

    response = None
    file_path = os.path.join(dst_dir, file_name)
    temp_path = os.path.join(dst_dir, file_name+".downloads")
    repair_count = 1
    try:
        response = requests.get(
            image_url, headers=headers, timeout=timeout, proxies=proxies)
        while response.status_code != 200 and repair_count <= 5:
            download_image(image_url,dst_dir,file_name)
            print(f'重试：第{repair_count}次 {image_url}')
            repair_count += 1
        with open(temp_path, 'wb') as f:
            f.write(response.content)
        response.close()
        shutil.move(temp_path, file_path)
        print("## OK:  {}  {}".format(file_path, image_url))
    except Exception as e:
        if response:
           response.close()
        print("## Fail:  {}  {}".format(image_url, e.args))


def download_images(image_urls, dst_dir, file_prefix="img", concurrency=50, timeout=360, proxy_type=None, proxy=None,filesName=None):
    """
    Download image according to given urls and automatically rename them in order.
    :param timeout:
    :param proxy:
    :param proxy_type:
    :param image_urls: list of image urls
    :param dst_dir: output the downloaded images to dst_dir
    :param file_prefix: if set to "img", files will be in format "img_xxx.jpg"
    :param concurrency: number of requests process simultaneously
    :return: none
    """
    concurrency = len(image_urls) 
    with concurrent.futures.ThreadPoolExecutor(max_workers=concurrency) as executor:
        future_list = list()
        count = 0 
        if not os.path.exists(dst_dir):
            os.makedirs(dst_dir)
        for image_url in image_urls:
            file_name = filesName[count] 
            future_list.append(executor.submit(
                download_image, image_url, dst_dir, file_name, timeout, proxy_type, proxy))
            count += 1
        concurrent.futures.wait(future_list, timeout=360)