import sys
from subprocess import call
import re

url_pattern = "^https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$"

def main():
    if (len(sys.argv) != 2):
        print("Wrong parameters!")
        sys.exit(-1)
    url = sys.argv[1].strip()
    print("passing link " + str(url))
    if (re.match(url_pattern,url) == None):
        print("Url has to be a valid link!")
        sys.exit(-1)
        
    if ("spotify" not in url or "https://" not in url):
        print("Url has to be a spotify link!")
        sys.exit(-1)
    print("executing command")
    call("spotdl download " + url, shell=True, user="sem")
#    call("./download-spotify.sh " + url, shell=True, user="sem") # run as user sem to have the SPOTIPY_CLIENT_ID and SPOTIPY_CLIENT_SECRET environment variables set

if __name__ == "__main__":
    main()