import re,os,json,requests,urllib.request

URL = "http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1"
dir_path = os.environ['HOME'] + '/Pictures/Bing_Pic_of_the_Day/'

if __name__ == '__main__':
    try:
        image_data = json.loads(requests.get(URL).text)
        image_url = 'http://www.bing.com' + image_data['images'][0]['url']
        _image_name_arr = image_url.split("&")
        __image_name_arr = _image_name_arr[0].split("?")
        image_name = re.sub(r'^id\=',"",__image_name_arr[1])

        if not os.path.exists(dir_path):
            os.makedirs(dir_path)

        file_path = dir_path + image_name

        if os.path.exists(file_path) is False:
            urllib.request.urlretrieve(image_url, filename=file_path)
            image_desc = image_data['images'][0]['copyright']
            command = 'gsettings set org.gnome.desktop.background picture-uri file://' + file_path
            os.system(command)
            notify = 'notify-send -u critical "Wallpaper for the Day updated!" "' + image_desc + '"'
            os.system(notify)
        else:
            notify = 'notify-send -u critical "Bing Wallpaper" "Wallpaper for the day has been updated already!"'
            os.system(notify)
    except:
        notify = 'notify-send -u critical "Bing Wallpaper" "Wallpaper can\'t be updated!"'
        os.system(notify)