#!/usr/bin/env python

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.

import os
import subprocess
import sys
import unittest
from mozprocess import processhandler

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

def make_proclaunch(aDir):
    """
        Makes the proclaunch executable.
        Params:
            aDir - the directory in which to issue the make commands
        Returns:
            the path to the proclaunch executable that is generated
    """

    if sys.platform == "win32":
        exepath = os.path.join(aDir, "proclaunch.exe")
    else:
        exepath = os.path.join(aDir, "proclaunch")

    # remove the launcher, if it already exists
    # otherwise, if the make fails you may not notice
    if os.path.exists(exepath):
        os.remove(exepath)

    # Ideally make should take care of both calls through recursion, but since it doesn't,
    # on windows anyway (to file?), let's just call out both targets explicitly.
    for command in [["make", "-C", "iniparser"],
                    ["make"]]:
        process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=aDir)
        stdout, stderr = process.communicate()
        if process.returncode:
            # SomethingBadHappen; print all the things
            print "%s: exit %d" % (command, process.returncode)
            print "stdout:\n%s" % stdout
            print "stderr:\n%s" % stderr
            raise subprocess.CalledProcessError(process.returncode, command, stdout)

    # ensure the launcher now exists
    if not os.path.exists(exepath):
        raise AssertionError("proclaunch executable '%s' does not exist (sys.platform=%s)" % (exepath, sys.platform))
    return exepath

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 sys.platform == "win32":
        # 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):

    # whether to remove created files on exit
    cleanup = os.environ.get('CLEANUP', 'true').lower() in ('1', 'true')

    @classmethod
    def setUpClass(cls):
        cls.proclaunch = make_proclaunch(here)

    @classmethod
    def tearDownClass(cls):
        del cls.proclaunch
        if not cls.cleanup:
            return
        files = [('proclaunch',),
                 ('proclaunch.exe',),
                 ('iniparser', 'dictionary.o'),
                 ('iniparser', 'iniparser.lib'),
                 ('iniparser', 'iniparser.o'),
                 ('iniparser', 'libiniparser.a'),
                 ('iniparser', 'libiniparser.so.0'),
                 ]
        files = [os.path.join(here, *path) for path in files]
        errors = []
        for path in files:
            if os.path.exists(path):
                try:
                    os.remove(path)
                except OSError as e:
                    errors.append(str(e))
        if errors:
            raise OSError("Error(s) encountered tearing down %s.%s:\n%s" % (cls.__module__, cls.__name__, '\n'.join(errors)))

    def test_process_normal_finish(self):
        """Process is started, runs to completion while we wait for it"""

        p = processhandler.ProcessHandler([self.proclaunch, "process_normal_finish.ini"],
                                          cwd=here)
        p.run()
        p.wait()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout)

    def test_commandline_no_args(self):
        """Command line is reported correctly when no arguments are specified"""
        p = processhandler.ProcessHandler(self.proclaunch, cwd=here)
        self.assertEqual(p.commandline, self.proclaunch)

    def test_commandline_overspecified(self):
        """Command line raises an exception when the arguments are specified ambiguously"""
        err = None
        try:
            processhandler.ProcessHandler([self.proclaunch, "process_normal_finish.ini"],
                                          args=["1", "2", "3"],
                                          cwd=here)
        except TypeError, e:
            err = e

        self.assertTrue(err)

    def test_commandline_from_list(self):
        """Command line is reported correctly when command and arguments are specified in a list"""
        p = processhandler.ProcessHandler([self.proclaunch, "process_normal_finish.ini"],
                                          cwd=here)
        self.assertEqual(p.commandline, self.proclaunch + ' process_normal_finish.ini')

    def test_commandline_over_specified(self):
        """Command line raises an exception when the arguments are specified ambiguously"""
        err = None
        try:
            processhandler.ProcessHandler([self.proclaunch, "process_normal_finish.ini"],
                                          args=["1", "2", "3"],
                                          cwd=here)
        except TypeError, e:
            err = e

        self.assertTrue(err)

    def test_commandline_from_args(self):
        """Command line is reported correctly when arguments are specified in a dedicated list"""
        p = processhandler.ProcessHandler(self.proclaunch,
                                          args=["1", "2", "3"],
                                          cwd=here)
        self.assertEqual(p.commandline, self.proclaunch + ' 1 2 3')

    def test_process_wait(self):
        """Process is started runs to completion while we wait indefinitely"""

        p = processhandler.ProcessHandler([self.proclaunch,
                                          "process_waittimeout_10s.ini"],
                                          cwd=here)
        p.run()
        p.wait()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout)

    def test_process_timeout(self):
        """ Process is started, runs but we time out waiting on it
            to complete
        """
        p = processhandler.ProcessHandler([self.proclaunch, "process_waittimeout.ini"],
                                          cwd=here)
        p.run(timeout=10)
        p.wait()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout,
                              False,
                              ['returncode', 'didtimeout'])

    def test_process_timeout_no_kill(self):
        """ Process is started, runs but we time out waiting on it
            to complete. Process should not be killed.
        """
        p = None
        def timeout_handler():
            self.assertEqual(p.proc.poll(), None)
            p.kill()
        p = processhandler.ProcessHandler([self.proclaunch, "process_waittimeout.ini"],
                                          cwd=here,
                                          onTimeout=(timeout_handler,),
                                          kill_on_timeout=False)
        p.run(timeout=1)
        p.wait()
        self.assertTrue(p.didTimeout)

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout,
                              False,
                              ['returncode', 'didtimeout'])

    def test_process_waittimeout(self):
        """
        Process is started, then wait is called and times out.
        Process is still running and didn't timeout
        """
        p = processhandler.ProcessHandler([self.proclaunch,
                                          "process_waittimeout_10s.ini"],
                                          cwd=here)

        p.run()
        p.wait(timeout=5)

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout,
                              True,
                              ())

    def test_process_waitnotimeout(self):
        """ Process is started, runs to completion before our wait times out
        """
        p = processhandler.ProcessHandler([self.proclaunch,
                                          "process_waittimeout_10s.ini"],
                                          cwd=here)
        p.run(timeout=30)
        p.wait()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout)

    def test_process_kill(self):
        """Process is started, we kill it"""

        p = processhandler.ProcessHandler([self.proclaunch, "process_normal_finish.ini"],
                                          cwd=here)
        p.run()
        p.kill()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout)

    def test_process_output_twice(self):
        """
        Process is started, then processOutput is called a second time explicitly
        """
        p = processhandler.ProcessHandler([self.proclaunch,
                                          "process_waittimeout_10s.ini"],
                                          cwd=here)

        p.run()
        p.processOutput(timeout=5)
        p.wait()

        detected, output = check_for_process(self.proclaunch)
        self.determine_status(detected,
                              output,
                              p.proc.returncode,
                              p.didTimeout,
                              False,
                              ())

    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)

if __name__ == '__main__':
    unittest.main()