# -*- coding: utf-8 -*-
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""SuiteRunner defines the interface from crosperf to test script."""

from __future__ import division
from __future__ import print_function

import json
import os
import pipes
import shlex
import time

from cros_utils import command_executer

TEST_THAT_PATH = '/usr/bin/test_that'
# TODO: Need to check whether Skylab is installed and set up correctly.
SKYLAB_PATH = '/usr/local/bin/skylab'
GS_UTIL = 'src/chromium/depot_tools/gsutil.py'
AUTOTEST_DIR = '/mnt/host/source/src/third_party/autotest/files'
CHROME_MOUNT_DIR = '/tmp/chrome_root'


def GetProfilerArgs(profiler_args):
  # Remove "--" from in front of profiler args.
  args_list = shlex.split(profiler_args)
  new_list = []
  for arg in args_list:
    if arg[0:2] == '--':
      arg = arg[2:]
    new_list.append(arg)
  args_list = new_list

  # Remove "perf_options=" from middle of profiler args.
  new_list = []
  for arg in args_list:
    idx = arg.find('perf_options=')
    if idx != -1:
      prefix = arg[0:idx]
      suffix = arg[idx + len('perf_options=') + 1:-1]
      new_arg = prefix + "'" + suffix + "'"
      new_list.append(new_arg)
    else:
      new_list.append(arg)
  args_list = new_list

  return ' '.join(args_list)


def GetDutConfigArgs(dut_config):
  return 'dut_config={}'.format(pipes.quote(json.dumps(dut_config)))


class SuiteRunner(object):
  """This defines the interface from crosperf to test script."""

  def __init__(self,
               dut_config,
               logger_to_use=None,
               log_level='verbose',
               cmd_exec=None,
               cmd_term=None):
    self.logger = logger_to_use
    self.log_level = log_level
    self._ce = cmd_exec or command_executer.GetCommandExecuter(
        self.logger, log_level=self.log_level)
    # DUT command executer.
    # Will be initialized and used within Run.
    self._ct = cmd_term or command_executer.CommandTerminator()
    self.dut_config = dut_config

  def Run(self, cros_machine, label, benchmark, test_args, profiler_args):
    machine_name = cros_machine.name
    for i in range(0, benchmark.retries + 1):
      if label.skylab:
        ret_tup = self.Skylab_Run(label, benchmark, test_args, profiler_args)
      else:
        ret_tup = self.Test_That_Run(machine_name, label, benchmark, test_args,
                                     profiler_args)
      if ret_tup[0] != 0:
        self.logger.LogOutput('benchmark %s failed. Retries left: %s' %
                              (benchmark.name, benchmark.retries - i))
      elif i > 0:
        self.logger.LogOutput(
            'benchmark %s succeded after %s retries' % (benchmark.name, i))
        break
      else:
        self.logger.LogOutput(
            'benchmark %s succeded on first try' % benchmark.name)
        break
    return ret_tup

  def RemoveTelemetryTempFile(self, machine, chromeos_root):
    filename = 'telemetry@%s' % machine
    fullname = os.path.join(chromeos_root, 'chroot', 'tmp', filename)
    if os.path.exists(fullname):
      os.remove(fullname)

  def GenTestArgs(self, benchmark, test_args, profiler_args):
    args_list = []

    if benchmark.suite != 'telemetry_Crosperf' and profiler_args:
      self.logger.LogFatal('Tests other than telemetry_Crosperf do not '
                           'support profiler.')

    if test_args:
      # Strip double quotes off args (so we can wrap them in single
      # quotes, to pass through to Telemetry).
      if test_args[0] == '"' and test_args[-1] == '"':
        test_args = test_args[1:-1]
      args_list.append("test_args='%s'" % test_args)

    args_list.append(GetDutConfigArgs(self.dut_config))

    if not (benchmark.suite == 'telemetry_Crosperf' or
            benchmark.suite == 'crosperf_Wrapper'):
      self.logger.LogWarning('Please make sure the server test has stage for '
                             'device setup.\n')
    else:
      args_list.append('test=%s' % benchmark.test_name)
      if benchmark.suite == 'telemetry_Crosperf':
        args_list.append('run_local=%s' % benchmark.run_local)
        args_list.append(GetProfilerArgs(profiler_args))

    return args_list

  def Test_That_Run(self, machine, label, benchmark, test_args, profiler_args):
    """Run the test_that test.."""

    # Remove existing test_that results
    command = 'rm -rf /usr/local/autotest/results/*'
    self._ce.CrosRunCommand(
        command, machine=machine, chromeos_root=label.chromeos_root)

    if benchmark.suite == 'telemetry_Crosperf':
      if not os.path.isdir(label.chrome_src):
        self.logger.LogFatal('Cannot find chrome src dir to '
                             'run telemetry: %s' % label.chrome_src)
      # Check for and remove temporary file that may have been left by
      # previous telemetry runs (and which might prevent this run from
      # working).
      self.RemoveTelemetryTempFile(machine, label.chromeos_root)

    # --autotest_dir specifies which autotest directory to use.
    autotest_dir_arg = '--autotest_dir=%s' % (
        label.autotest_path if label.autotest_path else AUTOTEST_DIR)

    # --fast avoids unnecessary copies of syslogs.
    fast_arg = '--fast'
    board_arg = '--board=%s' % label.board

    args_list = self.GenTestArgs(benchmark, test_args, profiler_args)
    args_arg = '--args=%s' % pipes.quote(' '.join(args_list))

    command = ' '.join([
        TEST_THAT_PATH, autotest_dir_arg, fast_arg, board_arg, args_arg,
        machine, benchmark.suite if
        (benchmark.suite == 'telemetry_Crosperf' or
         benchmark.suite == 'crosperf_Wrapper') else benchmark.test_name
    ])

    # Use --no-ns-pid so that cros_sdk does not create a different
    # process namespace and we can kill process created easily by their
    # process group.
    chrome_root_options = ('--no-ns-pid '
                           '--chrome_root={} --chrome_root_mount={} '
                           'FEATURES="-usersandbox" '
                           'CHROME_ROOT={}'.format(label.chrome_src,
                                                   CHROME_MOUNT_DIR,
                                                   CHROME_MOUNT_DIR))

    if self.log_level != 'verbose':
      self.logger.LogOutput('Running test.')
      self.logger.LogOutput('CMD: %s' % command)

    return self._ce.ChrootRunCommandWOutput(
        label.chromeos_root,
        command,
        command_terminator=self._ct,
        cros_sdk_options=chrome_root_options)

  def DownloadResult(self, label, task_id):
    gsutil_cmd = os.path.join(label.chromeos_root, GS_UTIL)
    result_dir = 'gs://chromeos-autotest-results/swarming-%s' % task_id
    download_path = os.path.join(label.chromeos_root, 'chroot/tmp')
    ls_command = '%s ls %s' % (gsutil_cmd,
                               os.path.join(result_dir, 'autoserv_test'))
    cp_command = '%s -mq cp -r %s %s' % (gsutil_cmd, result_dir, download_path)

    # Server sometimes will not be able to generate the result directory right
    # after the test. Will try to access this gs location every 60s for
    # RETRY_LIMIT mins.
    t = 0
    RETRY_LIMIT = 10
    while t < RETRY_LIMIT:
      t += 1
      status = self._ce.RunCommand(ls_command, print_to_console=False)
      if status == 0:
        break
      if t < RETRY_LIMIT:
        self.logger.LogOutput('Result directory not generated yet, '
                              'retry (%d) in 60s.' % t)
        time.sleep(60)
      else:
        self.logger.LogOutput('No result directory for task %s' % task_id)
        return status

    # Wait for 60s to make sure server finished writing to gs location.
    time.sleep(60)

    status = self._ce.RunCommand(cp_command)
    if status != 0:
      self.logger.LogOutput('Cannot download results from task %s' % task_id)
    else:
      self.logger.LogOutput('Result downloaded for task %s' % task_id)
    return status

  def Skylab_Run(self, label, benchmark, test_args, profiler_args):
    """Run the test via skylab.."""
    options = []
    if label.board:
      options.append('-board=%s' % label.board)
    if label.build:
      options.append('-image=%s' % label.build)
    # TODO: now only put toolchain pool here, user need to be able to specify
    # which pool to use. Need to request feature to not use this option at all.
    options.append('-pool=toolchain')

    args_list = self.GenTestArgs(benchmark, test_args, profiler_args)
    options.append('-test-args=%s' % pipes.quote(' '.join(args_list)))

    dimensions = []
    for dut in label.remote:
      dimensions.append('-dim dut_name:%s' % dut.rstrip('.cros'))

    command = (('%s create-test %s %s %s') % \
              (SKYLAB_PATH, ' '.join(dimensions), ' '.join(options),
               benchmark.suite if
               (benchmark.suite == 'telemetry_Crosperf' or
                benchmark.suite == 'crosperf_Wrapper')
               else benchmark.test_name))

    if self.log_level != 'verbose':
      self.logger.LogOutput('Starting skylab test.')
      self.logger.LogOutput('CMD: %s' % command)
    ret_tup = self._ce.RunCommandWOutput(command, command_terminator=self._ct)

    if ret_tup[0] != 0:
      self.logger.LogOutput('Skylab test not created successfully.')
      return ret_tup

    # Std output of the command will look like:
    # Created request at https://ci.chromium.org/../cros_test_platform/b12345
    # We want to parse it and get the id number of the task, which is the
    # number in the very end of the link address.
    task_id = ret_tup[1].strip().split('b')[-1]

    command = ('skylab wait-task %s' % task_id)
    if self.log_level != 'verbose':
      self.logger.LogOutput('Waiting for skylab test to finish.')
      self.logger.LogOutput('CMD: %s' % command)

    ret_tup = self._ce.RunCommandWOutput(command, command_terminator=self._ct)

    # The output of `wait-task` command will be a combination of verbose and a
    # json format result in the end. The json result looks like this:
    # {"task-result":
    #   {"name":"Test Platform Invocation",
    #    "state":"", "failure":false, "success":true,
    #    "task-run-id":"12345",
    #    "task-run-url":"https://ci.chromium.org/.../cros_test_platform/b12345",
    #    "task-logs-url":""
    #    },
    #  "stdout":"",
    #  "child-results":
    #    [{"name":"graphics_WebGLAquarium",
    #      "state":"", "failure":false, "success":true, "task-run-id":"",
    #      "task-run-url":"https://chromeos-swarming.appspot.com/task?id=1234",
    #      "task-logs-url":"https://stainless.corp.google.com/1234/"}
    #    ]
    # }
    # We need the task id of the child-results to download result.
    output = json.loads(ret_tup[1].split('\n')[-1])
    output = output['child-results'][0]
    if output['success']:
      task_id = output['task-run-url'].split('=')[-1]
      if self.DownloadResult(label, task_id) == 0:
        result_dir = '\nResults placed in tmp/swarming-%s\n' % task_id
        return (ret_tup[0], result_dir, ret_tup[2])
    return ret_tup

  def CommandTerminator(self):
    return self._ct

  def Terminate(self):
    self._ct.Terminate()


class MockSuiteRunner(object):
  """Mock suite runner for test."""

  def __init__(self):
    self._true = True

  def Run(self, *_args):
    if self._true:
      return [0, '', '']
    else:
      return [0, '', '']