# 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/.

from __future__ import print_function

import datetime
import re
import signal
import sys
import tempfile
import time

import mozfile

from .runner import BaseRunner
from ..devices import Emulator

class DeviceRunner(BaseRunner):
    """
    The base runner class used for running gecko on
    remote devices (or emulators), such as B2G.
    """
    env = { 'MOZ_CRASHREPORTER': '1',
            'MOZ_CRASHREPORTER_NO_REPORT': '1',
            'MOZ_CRASHREPORTER_SHUTDOWN': '1',
            'MOZ_HIDE_RESULTS_TABLE': '1',
            'MOZ_LOG': 'signaling:5,mtransport:5,datachannel:5,jsep:5,MediaPipelineFactory:5',
            'R_LOG_LEVEL': '6',
            'R_LOG_DESTINATION': 'stderr',
            'R_LOG_VERBOSE': '1',
            'NO_EM_RESTART': '1', }

    def __init__(self, device_class, device_args=None, **kwargs):
        process_log = tempfile.NamedTemporaryFile(suffix='pidlog')
        # the env will be passed to the device, it is not a *real* env
        self._device_env = dict(DeviceRunner.env)
        self._device_env['MOZ_PROCESS_LOG'] = process_log.name
        # be sure we do not pass env to the parent class ctor
        env = kwargs.pop('env', None)
        if env:
            self._device_env.update(env)

        process_args = {'stream': sys.stdout,
                        'processOutputLine': self.on_output,
                        'onFinish': self.on_finish,
                        'onTimeout': self.on_timeout }
        process_args.update(kwargs.get('process_args') or {})

        kwargs['process_args'] = process_args
        BaseRunner.__init__(self, **kwargs)

        device_args = device_args or {}
        self.device = device_class(**device_args)

    @property
    def command(self):
        cmd = [self.app_ctx.adb]
        if self.app_ctx.dm._deviceSerial:
            cmd.extend(['-s', self.app_ctx.dm._deviceSerial])
        cmd.append('shell')
        for k, v in self._device_env.iteritems():
            cmd.append('%s=%s' % (k, v))
        cmd.append(self.app_ctx.remote_binary)
        return cmd

    def start(self, *args, **kwargs):
        if isinstance(self.device, Emulator) and not self.device.connected:
            self.device.start()
        self.device.connect()
        self.device.setup_profile(self.profile)

        # TODO: this doesn't work well when the device is running but dropped
        # wifi for some reason. It would be good to probe the state of the device
        # to see if we have the homescreen running, or something, before waiting here
        self.device.wait_for_net()

        if not self.device.wait_for_net():
            raise Exception("Network did not come up when starting device")

        BaseRunner.start(self, *args, **kwargs)

        timeout = 10 # seconds
        starttime = datetime.datetime.now()
        while datetime.datetime.now() - starttime < datetime.timedelta(seconds=timeout):
            if self.is_running():
                break
            time.sleep(1)
        else:
            print("timed out waiting for '%s' process to start" % self.app_ctx.remote_process)

        if not self.device.wait_for_net():
            raise Exception("Failed to get a network connection")

    def stop(self, sig=None):
        def _wait_for_shutdown(pid, timeout=10):
            start_time = datetime.datetime.now()
            end_time = datetime.timedelta(seconds=timeout)
            while datetime.datetime.now() - start_time < end_time:
                if self.is_running() != pid:
                    return True
                time.sleep(1)
            return False

        remote_pid = self.is_running()
        if remote_pid:
            self.app_ctx.dm.killProcess(
                self.app_ctx.remote_process, sig=sig)
            if not _wait_for_shutdown(remote_pid) and sig is not None:
                print("timed out waiting for '%s' process to exit, trying "
                      "without signal {}".format(
                          self.app_ctx.remote_process, sig))

            # need to call adb stop otherwise the system will attempt to
            # restart the process
            remote_pid = self.is_running() or remote_pid
            self.app_ctx.stop_application()
            if not _wait_for_shutdown(remote_pid):
                print("timed out waiting for '%s' process to exit".format(
                    self.app_ctx.remote_process))

    def is_running(self):
        return self.app_ctx.dm.processExist(self.app_ctx.remote_process)

    def on_output(self, line):
        match = re.findall(r"TEST-START \| ([^\s]*)", line)
        if match:
            self.last_test = match[-1]

    def on_timeout(self):
        self.stop(sig=signal.SIGABRT)
        msg = "DeviceRunner TEST-UNEXPECTED-FAIL | %s | application timed out after %s seconds"
        if self.timeout:
            timeout = self.timeout
        else:
            timeout = self.output_timeout
            msg = "%s with no output" % msg

        print(msg % (self.last_test, timeout))
        self.check_for_crashes()

    def on_finish(self):
        self.check_for_crashes()

    def check_for_crashes(self, dump_save_path=None, test_name=None):
        test_name = test_name or self.last_test
        dump_dir = self.device.pull_minidumps()
        crashed = BaseRunner.check_for_crashes(
            self,
            dump_directory=dump_dir,
            dump_save_path=dump_save_path,
            test_name=test_name)
        mozfile.remove(dump_dir)
        return crashed

    def cleanup(self, *args, **kwargs):
        BaseRunner.cleanup(self, *args, **kwargs)
        self.device.cleanup()
