import json
import itertools
import os
from urllib import request, error

raw = open('images.json')
data = json.load(raw)
raw.close()

for res in data['resolutions']:
    if not os.path.exists(res):
        os.mkdir(res)

for image in data['imageNames']:
    retrieved = False

    for res in data['resolutions']:
        try:
            f = open('%s/%s_%s.jpg' % (res, image, res), 'r')
            retrieved = True
            break
        except:
            pass

    if retrieved:
        continue

    for info in itertools.product(data['resolutions'], data['cdns']):
        localpath = '%s/%s_%s.jpg' % (info[0], image, info[0])
        url = '%s%s_%s.jpg' % (info[1], image, info[0])
        print('Downloading file %s... ' % url, end='')

        try:
            response = request.urlretrieve(url, localpath)
            print('Ok!')
            break
        except error.URLError:
            print('Failed!')