#!/usr/bin/python
# 
# Test the calc plugin
# 
# by Cyndy Ejanda and Arunima Singh
#
import sys, imp, atexit
sys.path.append("/home/courses/cs3214/software/pexpect-dpty/");
import pexpect, shellio, signal, time, os, re, proc_check

#Ensure the shell process is terminated
def force_shell_termination(shell_process):
	c.close(force=True)

#pulling in the regular expression and other definitions
definitions_scriptname = sys.argv[1]
plugin_dir = sys.argv[2]
def_module = imp.load_source('', definitions_scriptname)
logfile = None
if hasattr(def_module, 'logfile'):
    logfile = def_module.logfile

#spawn an instance of the shell
c = pexpect.spawn(def_module.shell + plugin_dir, drainpty=True, logfile=logfile)

atexit.register(force_shell_termination, shell_process=c)

c.timeout = 2

############################ Test #############################

# test for errors
# user did not enter the required number of arguments
c.sendline("calc") 
assert c.expect("calc error: incorrect usage") == 0, "calc error: incorrect usage"
c.sendline("calc a") 
assert c.expect("calc error: incorrect usage") == 0, "calc error: incorrect usage"
# user entered incorrect option
c.sendline("calc z") 
assert c.expect("calc error: incorrect usage") == 0, "calc error: incorrect usage"

# start calculating
# add
c.sendline("calc a 1 2") 
assert c.expect("sum is 3") == 0, "calc error: unexpected output"
c.sendline("calc a -1 2") 
assert c.expect("sum is 1") == 0, "calc error: unexpected output"
# subtract
c.sendline("calc s 2 1") 
assert c.expect("difference is 1") == 0, "calc error: unexpected output"
c.sendline("calc s -1 2") 
assert c.expect("difference is -3") == 0, "calc error: unexpected output"
# multiply
c.sendline("calc m 2 1") 
assert c.expect("product is 2") == 0, "calc error: unexpected output"
c.sendline("calc m -1 2") 
assert c.expect("product is -2") == 0, "calc error: unexpected output"
# divide
c.sendline("calc d 2 1") 
assert c.expect("quotient is 2") == 0, "calc error: unexpected output"
c.sendline("calc d -4 2") 
assert c.expect("quotient is -2") == 0, "calc error: unexpected output"
c.sendline("calc d 10 3") 
assert c.expect("quotient is 3") == 0, "calc error: unexpected output"

c.sendline("exit")
assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters"
shellio.success()