# 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 datetime
import mozcrash
import threading
import os
import posixpath
import Queue
import re
import shutil
import signal
import tempfile
import time
import traceback
import zipfile

from automation import Automation
from mozlog.structured import get_default_logger
from mozprocess import ProcessHandlerMixin


class StdOutProc(ProcessHandlerMixin):
    """Process handler for b2g which puts all output in a Queue.
    """

    def __init__(self, cmd, queue, **kwargs):
        self.queue = queue
        kwargs.setdefault('processOutputLine', []).append(self.handle_output)
        ProcessHandlerMixin.__init__(self, cmd, **kwargs)

    def handle_output(self, line):
        self.queue.put_nowait(line)


class B2GRemoteAutomation(Automation):
    _devicemanager = None

    def __init__(self, deviceManager, appName='', remoteLog=None,
                 marionette=None, context_chrome=True):
        self._devicemanager = deviceManager
        self._appName = appName
        self._remoteProfile = None
        self._remoteLog = remoteLog
        self.marionette = marionette
        self.context_chrome = context_chrome
        self._is_emulator = False
        self.test_script = None
        self.test_script_args = None

        # Default our product to b2g
        self._product = "b2g"
        self.lastTestSeen = "b2gautomation.py"
        # Default log finish to mochitest standard
        self.logFinish = 'INFO SimpleTest FINISHED'
        Automation.__init__(self)

    def setEmulator(self, is_emulator):
        self._is_emulator = is_emulator

    def setDeviceManager(self, deviceManager):
        self._devicemanager = deviceManager

    def setAppName(self, appName):
        self._appName = appName

    def setRemoteProfile(self, remoteProfile):
        self._remoteProfile = remoteProfile

    def setProduct(self, product):
        self._product = product

    def setRemoteLog(self, logfile):
        self._remoteLog = logfile

    def getExtensionIDFromRDF(self, rdfSource):
        """
        Retrieves the extension id from an install.rdf file (or string).
        """
        from xml.dom.minidom import parse, parseString, Node

        if isinstance(rdfSource, file):
            document = parse(rdfSource)
        else:
            document = parseString(rdfSource)

        # Find the <em:id> element. There can be multiple <em:id> tags
        # within <em:targetApplication> tags, so we have to check this way.
        for rdfChild in document.documentElement.childNodes:
            if rdfChild.nodeType == Node.ELEMENT_NODE and rdfChild.tagName == "Description":
                for descChild in rdfChild.childNodes:
                    if descChild.nodeType == Node.ELEMENT_NODE and descChild.tagName == "em:id":
                        return descChild.childNodes[0].data
        return None

    def installExtension(self, extensionSource, profileDir, extensionID=None):
        # Bug 827504 - installing special-powers extension separately causes problems in B2G
        if extensionID != "special-powers@mozilla.org":
            if not os.path.isdir(profileDir):
              self.log.info("INFO | automation.py | Cannot install extension, invalid profileDir at: %s", profileDir)
              return

            installRDFFilename = "install.rdf"

            extensionsRootDir = os.path.join(profileDir, "extensions", "staged")
            if not os.path.isdir(extensionsRootDir):
              os.makedirs(extensionsRootDir)

            if os.path.isfile(extensionSource):
              reader = zipfile.ZipFile(extensionSource, "r")

              for filename in reader.namelist():
                # Sanity check the zip file.
                if os.path.isabs(filename):
                  self.log.info("INFO | automation.py | Cannot install extension, bad files in xpi")
                  return

                # We may need to dig the extensionID out of the zip file...
                if extensionID is None and filename == installRDFFilename:
                  extensionID = self.getExtensionIDFromRDF(reader.read(filename))

              # We must know the extensionID now.
              if extensionID is None:
                self.log.info("INFO | automation.py | Cannot install extension, missing extensionID")
                return

              # Make the extension directory.
              extensionDir = os.path.join(extensionsRootDir, extensionID)
              os.mkdir(extensionDir)

              # Extract all files.
              reader.extractall(extensionDir)

            elif os.path.isdir(extensionSource):
              if extensionID is None:
                filename = os.path.join(extensionSource, installRDFFilename)
                if os.path.isfile(filename):
                  with open(filename, "r") as installRDF:
                    extensionID = self.getExtensionIDFromRDF(installRDF)

                if extensionID is None:
                  self.log.info("INFO | automation.py | Cannot install extension, missing extensionID")
                  return

              # Copy extension tree into its own directory.
              # "destination directory must not already exist".
              shutil.copytree(extensionSource, os.path.join(extensionsRootDir, extensionID))

            else:
              self.log.info("INFO | automation.py | Cannot install extension, invalid extensionSource at: %s", extensionSource)

    # Set up what we need for the remote environment
    def environment(self, env=None, xrePath=None, crashreporter=True, debugger=False):
        # Because we are running remote, we don't want to mimic the local env
        # so no copying of os.environ
        if env is None:
            env = {}

        if crashreporter:
            env['MOZ_CRASHREPORTER'] = '1'
            env['MOZ_CRASHREPORTER_NO_REPORT'] = '1'

        # We always hide the results table in B2G; it's much slower if we don't.
        env['MOZ_HIDE_RESULTS_TABLE'] = '1'
        return env

    def waitForNet(self):
        active = False
        time_out = 0
        while not active and time_out < 40:
            data = self._devicemanager._runCmd(['shell', '/system/bin/netcfg']).stdout.readlines()
            data.pop(0)
            for line in data:
                if (re.search(r'UP\s+(?:[0-9]{1,3}\.){3}[0-9]{1,3}', line)):
                    active = True
                    break
            time_out += 1
            time.sleep(1)
        return active

    def checkForCrashes(self, directory, symbolsPath):
        crashed = False
        remote_dump_dir = self._remoteProfile + '/minidumps'
        print "checking for crashes in '%s'" % remote_dump_dir
        if self._devicemanager.dirExists(remote_dump_dir):
            local_dump_dir = tempfile.mkdtemp()
            self._devicemanager.getDirectory(remote_dump_dir, local_dump_dir)
            try:
                logger = get_default_logger()
                if logger is not None:
                    crashed = mozcrash.log_crashes(logger, local_dump_dir, symbolsPath, test=self.lastTestSeen)
                else:
                    crashed = mozcrash.check_for_crashes(local_dump_dir, symbolsPath, test_name=self.lastTestSeen)
            except:
                traceback.print_exc()
            finally:
                shutil.rmtree(local_dump_dir)
                self._devicemanager.removeDir(remote_dump_dir)
        return crashed

    def buildCommandLine(self, app, debuggerInfo, profileDir, testURL, extraArgs):
        # if remote profile is specified, use that instead
        if (self._remoteProfile):
            profileDir = self._remoteProfile

        cmd, args = Automation.buildCommandLine(self, app, debuggerInfo, profileDir, testURL, extraArgs)

        return app, args

    def waitForFinish(self, proc, utilityPath, timeout, maxTime, startTime,
                      debuggerInfo, symbolsPath):
        """ Wait for tests to finish (as evidenced by a signature string
            in logcat), or for a given amount of time to elapse with no
            output.
        """
        timeout = timeout or 120
        while True:
            currentlog = proc.getStdoutLines(timeout)
            if currentlog:
                print currentlog
                # Match the test filepath from the last TEST-START line found in the new
                # log content. These lines are in the form:
                # ... INFO TEST-START | /filepath/we/wish/to/capture.html\n
                testStartFilenames = re.findall(r"TEST-START \| ([^\s]*)", currentlog)
                if testStartFilenames:
                    self.lastTestSeen = testStartFilenames[-1]
                if hasattr(self, 'logFinish') and self.logFinish in currentlog:
                    return 0
            else:
                self.log.info("TEST-UNEXPECTED-FAIL | %s | application timed "
                              "out after %d seconds with no output",
                              self.lastTestSeen, int(timeout))
                self._devicemanager.killProcess('/system/b2g/b2g', sig=signal.SIGABRT)

                timeout = 10 # seconds
                starttime = datetime.datetime.now()
                while datetime.datetime.now() - starttime < datetime.timedelta(seconds=timeout):
                    if not self._devicemanager.processExist('/system/b2g/b2g'):
                        break
                    time.sleep(1)
                else:
                    print "timed out after %d seconds waiting for b2g process to exit" % timeout
                    return 1

                self.checkForCrashes(None, symbolsPath)
                return 1

    def getDeviceStatus(self, serial=None):
        # Get the current status of the device.  If we know the device
        # serial number, we look for that, otherwise we use the (presumably
        # only) device shown in 'adb devices'.
        serial = serial or self._devicemanager._deviceSerial
        status = 'unknown'

        for line in self._devicemanager._runCmd(['devices']).stdout.readlines():
            result = re.match('(.*?)\t(.*)', line)
            if result:
                thisSerial = result.group(1)
                if not serial or thisSerial == serial:
                    serial = thisSerial
                    status = result.group(2)

        return (serial, status)

    def restartB2G(self):
        # TODO hangs in subprocess.Popen without this delay
        time.sleep(5)
        self._devicemanager._checkCmd(['shell', 'stop', 'b2g'])
        # Wait for a bit to make sure B2G has completely shut down.
        time.sleep(10)
        self._devicemanager._checkCmd(['shell', 'start', 'b2g'])
        if self._is_emulator:
            self.marionette.emulator.wait_for_port(self.marionette.port)

    def rebootDevice(self):
        # find device's current status and serial number
        serial, status = self.getDeviceStatus()

        # reboot!
        self._devicemanager._runCmd(['shell', '/system/bin/reboot'])

        # The above command can return while adb still thinks the device is
        # connected, so wait a little bit for it to disconnect from adb.
        time.sleep(10)

        # wait for device to come back to previous status
        print 'waiting for device to come back online after reboot'
        start = time.time()
        rserial, rstatus = self.getDeviceStatus(serial)
        while rstatus != 'device':
            if time.time() - start > 120:
                # device hasn't come back online in 2 minutes, something's wrong
                raise Exception("Device %s (status: %s) not back online after reboot" % (serial, rstatus))
            time.sleep(5)
            rserial, rstatus = self.getDeviceStatus(serial)
        print 'device:', serial, 'status:', rstatus

    def Process(self, cmd, stdout=None, stderr=None, env=None, cwd=None):
        # On a desktop or fennec run, the Process method invokes a gecko
        # process in which to the tests.  For B2G, we simply
        # reboot the device (which was configured with a test profile
        # already), wait for B2G to start up, and then navigate to the
        # test url using Marionette.  There doesn't seem to be any way
        # to pass env variables into the B2G process, but this doesn't
        # seem to matter.

        # reboot device so it starts up with the mochitest profile
        # XXX:  We could potentially use 'stop b2g' + 'start b2g' to achieve
        # a similar effect; will see which is more stable while attempting
        # to bring up the continuous integration.
        if not self._is_emulator:
            self.rebootDevice()
            time.sleep(5)
            #wait for wlan to come up
            if not self.waitForNet():
                raise Exception("network did not come up, please configure the network" +
                                " prior to running before running the automation framework")

        # stop b2g
        self._devicemanager._runCmd(['shell', 'stop', 'b2g'])
        time.sleep(5)

        # For some reason user.js in the profile doesn't get picked up.
        # Manually copy it over to prefs.js. See bug 1009730 for more details.
        self._devicemanager.moveTree(posixpath.join(self._remoteProfile, 'user.js'),
                                     posixpath.join(self._remoteProfile, 'prefs.js'))

        # relaunch b2g inside b2g instance
        instance = self.B2GInstance(self._devicemanager, env=env)

        time.sleep(5)

        # Set up port forwarding again for Marionette, since any that
        # existed previously got wiped out by the reboot.
        if not self._is_emulator:
            self._devicemanager._checkCmd(['forward',
                                           'tcp:%s' % self.marionette.port,
                                           'tcp:%s' % self.marionette.port])

        if self._is_emulator:
            self.marionette.emulator.wait_for_port(self.marionette.port)
        else:
            time.sleep(5)

        # start a marionette session
        session = self.marionette.start_session()
        if 'b2g' not in session:
            raise Exception("bad session value %s returned by start_session" % session)

        self.marionette.set_context(self.marionette.CONTEXT_CHROME)
        self.marionette.execute_script("""
            let SECURITY_PREF = "security.turn_off_all_security_so_that_viruses_can_take_over_this_computer";
            Components.utils.import("resource://gre/modules/Services.jsm");
            Services.prefs.setBoolPref(SECURITY_PREF, true);

            if (!testUtils.hasOwnProperty("specialPowersObserver")) {
              let loader = Components.classes["@mozilla.org/moz/jssubscript-loader;1"]
                .getService(Components.interfaces.mozIJSSubScriptLoader);
              loader.loadSubScript("chrome://specialpowers/content/SpecialPowersObserver.js",
                testUtils);
              testUtils.specialPowersObserver = new testUtils.SpecialPowersObserver();
              testUtils.specialPowersObserver.init();
              testUtils.specialPowersObserver._loadFrameScript();
            }
            """)

        if not self.context_chrome:
            self.marionette.set_context(self.marionette.CONTEXT_CONTENT)

        # run the script that starts the tests
        if self.test_script:
            if os.path.isfile(self.test_script):
                script = open(self.test_script, 'r')
                self.marionette.execute_script(script.read(), script_args=self.test_script_args)
                script.close()
            elif isinstance(self.test_script, basestring):
                self.marionette.execute_script(self.test_script, script_args=self.test_script_args)
        else:
            # assumes the tests are started on startup automatically
            pass

        return instance

    # be careful here as this inner class doesn't have access to outer class members
    class B2GInstance(object):
        """Represents a B2G instance running on a device, and exposes
           some process-like methods/properties that are expected by the
           automation.
        """

        def __init__(self, dm, env=None):
            self.dm = dm
            self.env = env or {}
            self.stdout_proc = None
            self.queue = Queue.Queue()

            # Launch b2g in a separate thread, and dump all output lines
            # into a queue.  The lines in this queue are
            # retrieved and returned by accessing the stdout property of
            # this class.
            cmd = [self.dm._adbPath]
            if self.dm._deviceSerial:
                cmd.extend(['-s', self.dm._deviceSerial])
            cmd.append('shell')
            for k, v in self.env.iteritems():
                cmd.append("%s=%s" % (k, v))
            cmd.append('/system/bin/b2g.sh')
            proc = threading.Thread(target=self._save_stdout_proc, args=(cmd, self.queue))
            proc.daemon = True
            proc.start()

        def _save_stdout_proc(self, cmd, queue):
            self.stdout_proc = StdOutProc(cmd, queue)
            self.stdout_proc.run()
            if hasattr(self.stdout_proc, 'processOutput'):
                self.stdout_proc.processOutput()
            self.stdout_proc.wait()
            self.stdout_proc = None

        @property
        def pid(self):
            # a dummy value to make the automation happy
            return 0

        def getStdoutLines(self, timeout):
            # Return any lines in the queue used by the
            # b2g process handler.
            lines = []
            # get all of the lines that are currently available
            while True:
                try:
                    lines.append(self.queue.get_nowait())
                except Queue.Empty:
                    break

            # wait 'timeout' for any additional lines
            try:
                lines.append(self.queue.get(True, timeout))
            except Queue.Empty:
                pass
            return '\n'.join(lines)

        def wait(self, timeout=None):
            # this should never happen
            raise Exception("'wait' called on B2GInstance")

        def kill(self):
            # this should never happen
            raise Exception("'kill' called on B2GInstance")

