import subprocess
import json
import os
from pprint import pprint

test_tmp_file=os.getcwd()+os.sep+"dpctloutputtmp.tmp"


def apply_dpctl(test, config, cmd):
    switch_ip = config["switch_ip"]
    if len(switch_ip) == 0:
        assert(0)

    #apply dpctl command     
    subprocess.call("dpctl tcp:"+switch_ip+":6633 "+cmd+" > "+test_tmp_file, shell=True)

    
def apply_dpctl_get_cmd(test, config, cmd):

    #create the tmp file
    if not os.path.isfile(test_tmp_file):
        open(test_tmp_file, "w").close()
        subprocess.call(["sudo", "chmod", "a+w", test_tmp_file])

    apply_dpctl(test, config, cmd)
    
    #parse result
    with open(test_tmp_file) as tmp_file:
        try:
            json_result=json.loads(tmp_file.read(), encoding='utf-8')
        except ValueError:
            subprocess.call("cat "+ test_tmp_file, shell=True)
            """
            https://docs.python.org/2/library/unittest.html#
            """            
            test.assertTrue(False, "NO json format, dpctl may fail")
    
    return json_result            
    
def apply_dpctl_mod(test, config, cmd):    
    apply_dpctl(test, config, cmd)