import mozinfo
import os
import subprocess
import sys
import unittest

here = os.path.dirname(os.path.abspath(__file__))

def check_for_process(processName):
    """
        Use to determine if process of the given name is still running.

        Returns:
        detected -- True if process is detected to exist, False otherwise
        output -- if process exists, stdout of the process, '' otherwise
    """
    # TODO: replace with
    # https://github.com/mozilla/mozbase/blob/master/mozprocess/mozprocess/pid.py
    # which should be augmented from talos
    # see https://bugzilla.mozilla.org/show_bug.cgi?id=705864
    output = ''
    if mozinfo.isWin:
        # On windows we use tasklist
        p1 = subprocess.Popen(["tasklist"], stdout=subprocess.PIPE)
        output = p1.communicate()[0]
        detected = False
        for line in output.splitlines():
            if processName in line:
                detected = True
                break
    else:
        p1 = subprocess.Popen(["ps", "-ef"], stdout=subprocess.PIPE)
        p2 = subprocess.Popen(["grep", processName], stdin=p1.stdout, stdout=subprocess.PIPE)
        p1.stdout.close()
        output = p2.communicate()[0]
        detected = False
        for line in output.splitlines():
            if "grep %s" % processName in line:
                continue
            elif processName in line and not 'defunct' in line:
                detected = True
                break

    return detected, output

class ProcTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.proclaunch = os.path.join(here, "proclaunch.py")
        cls.python = sys.executable

    def determine_status(self,
                         detected=False,
                         output='',
                         returncode=0,
                         didtimeout=False,
                         isalive=False,
                         expectedfail=()):
        """
        Use to determine if the situation has failed.
        Parameters:
            detected -- value from check_for_process to determine if the process is detected
            output -- string of data from detected process, can be ''
            returncode -- return code from process, defaults to 0
            didtimeout -- True if process timed out, defaults to False
            isalive -- Use True to indicate we pass if the process exists; however, by default
                       the test will pass if the process does not exist (isalive == False)
            expectedfail -- Defaults to [], used to indicate a list of fields that are expected to fail
        """
        if 'returncode' in expectedfail:
            self.assertTrue(returncode, "Detected an unexpected return code of: %s" % returncode)
        elif not isalive:
            self.assertTrue(returncode == 0, "Detected non-zero return code of: %d" % returncode)

        if 'didtimeout' in expectedfail:
            self.assertTrue(didtimeout, "Detected that process didn't time out")
        else:
            self.assertTrue(not didtimeout, "Detected that process timed out")

        if isalive:
            self.assertTrue(detected, "Detected process is not running, process output: %s" % output)
        else:
            self.assertTrue(not detected, "Detected process is still running, process output: %s" % output)