# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2013 Vifib SARL and Contributors. All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
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# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
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##############################################################################

import argparse
import json
import importlib
import logging
import os
import sys
import tempfile
import time
import traceback
from erp5.util import taskdistribution
try:
  from erp5.util.testnode import Utils
except ImportError:
  pass

def importFrom(name):
  """
  Import a test suite module (in the suites module) and return it.
  """
  return importlib.import_module('.suites.%s' % name, package=__name__)

def parseArguments():
  """
  Parse arguments.
  """
  parser = argparse.ArgumentParser()
  parser.add_argument('--test-result-path', '--test_result_path',
                      metavar='ERP5_TEST_RESULT_PATH',
                      help='ERP5 relative path of the test result')

  parser.add_argument('--revision',
                      metavar='REVISION',
                      help='Revision of the test_suite')

  parser.add_argument('--test-suite', '--test_suite',
                      metavar='TEST_SUITE',
                      help='Name of the test suite')

  parser.add_argument('--test-suite-title', '--test_suite_title',
                      metavar='TEST_SUITE',
                      help='The test suite title')

  parser.add_argument('--node-title', '--test_node_title',
                      metavar='NODE_TITLE',
                      help='Title of the testnode which is running this'
                            'launcher')

  parser.add_argument('--node_quantity', help='Number of parallel tests to run',
                      default=1, type=int)

  parser.add_argument('--test-suite-master-url', '--master_url',
                      metavar='TEST_SUITE_MASTER_URL',
                      help='Url to connect to the ERP5 Master testsuite taskditributor')

  parser.add_argument('--log-path', '--log_path',
                      metavar='LOG_PATH',
                      help='Log Path')

  parser.add_argument('additional_arguments', nargs=argparse.REMAINDER)

  return parser.parse_args()

def setupLogging(name=__name__, log_path=None):
  logger_format = '%(asctime)s %(name)-13s: %(levelname)-8s %(message)s'
  formatter = logging.Formatter(logger_format)
  logging.basicConfig(level=logging.INFO, format=logger_format)

  root_logger = logging.getLogger('')
  fd, fname = tempfile.mkstemp()
  file_handler = logging.FileHandler(fname)
  file_handler.setFormatter(formatter)
  root_logger.addHandler(file_handler)

  if log_path:
    file_handler = logging.handlers.RotatingFileHandler(
        filename=log_path,
        maxBytes=20000000, backupCount=4)
    file_handler.setFormatter(formatter)
    root_logger.addHandler(file_handler)

  logger = logging.getLogger(name)
  return logger, fname

def runTestSuite(test_suite_title, test_suite_arguments, log):
  """
  Run a specified test suite, by dynamically loading the module and calling
  its "runTestSuite" method.
  """
  try:
    # Generate the additional arguments that were given using the syntax
    # additionalargument1=value1 additionalargument2=value2
    parsed_arguments = dict(key.split('=') for key in test_suite_arguments)
    test_suite_module = importFrom(test_suite_title)
    success = test_suite_module.runTestSuite(**parsed_arguments)
  except:
    log('Impossible to run resiliency test:')
    log(traceback.print_exc())
    success = False
  return success

class ScalabilityTest(object):
  """
  Simple structure carrying test data.
  """
  def __init__(self, data, test_result):
    self.__dict__ = {}
    self.__dict__.update(data)
    self.test_result = test_result

class ScalabilityLauncher(object):
  """
  Core part of the code, responsible of speaking with the ERP5 testnode Master
  and running tests.
  """
  def __init__(self):
    self._argumentNamespace = parseArguments()
    if self._argumentNamespace.log_path:
      log_path = os.path.join(self._argumentNamespace.log_path,
                              'runScalabilityTestSuite.log')
    else:
      log_path = None
    logger, fname = setupLogging('runScalabilityTestSuite', log_path)
    self.log = logger.info

    # Proxy to erp5 master test_result
    self.test_result = taskdistribution.TestResultProxy(
                        self._argumentNamespace.test_suite_master_url,
                        1.0, logger,
                        self._argumentNamespace.test_result_path,
                        self._argumentNamespace.node_title,
                        self._argumentNamespace.revision
                      )

  def getNextTest(self):
    """
    Return a ScalabilityTest with current running test case informations,
    or None if no test_case ready
    """
    data = self.test_result.getRunningTestCase()
    if data == None:
      return None
    decoded_data = Utils.deunicodeData(json.loads(
                  data
                ))
    next_test = ScalabilityTest(decoded_data, self.test_result)
    return next_test

  def run(self):
    self.log('Resiliency Launcher started, with:')
    self.log('Test suite master url: %s' % self._argumentNamespace.test_suite_master_url)
    self.log('Test suite: %s' % self._argumentNamespace.test_suite)
    self.log('Test result path: %s' % self._argumentNamespace.test_result_path)
    self.log('Revision: %s' % self._argumentNamespace.revision)
    self.log('Node title: %s' % self._argumentNamespace.node_title)

    while True:
      time.sleep(5)
      current_test = self.getNextTest()
      if current_test == None:
        self.log('No Test Case Ready')
      else:
        start_time = time.time()
        error_message_set, exit_status = set(), 0

        proxy = taskdistribution.ServerProxy(
                    self._argumentNamespace.test_suite_master_url,
                    allow_none=True
                ).portal_task_distribution
        retry_time = 2.0
        test_result_line_test = taskdistribution.TestResultLineProxy(
                                  proxy, retry_time, self.log,
                                  current_test.relative_path,
                                  current_test.title
                                )

        success = runTestSuite(
            self._argumentNamespace.test_suite,
            self._argumentNamespace.additional_arguments,
            self.log,
        )

        if success:
          error_count = 0
        else:
          error_count = 1

        test_duration = time.time() - start_time
        test_result_line_test.stop(stdout='Success',
                        test_count=1,
                        error_count=error_count,
                        duration=test_duration)
        self.log('Test Case Stopped')

    return error_message_set, exit_status

def runResiliencyTest():
  """
  Used for automated test suite run from "Scalability" Test Node infrastructure.
  It means the instance running this code should have been deployed by a
  "Scalability" Testnode.
  """
  error_message_set, exit_status = ScalabilityLauncher().run()
  for error_message in error_message_set:
    print >>sys.stderr, 'ERROR: %s' % error_message

  sys.exit(exit_status)

def runUnitTest():
  """
  Function meant to be run by "classical" (a.k.a UnitTest) erp5testnode.
  """
  args = parseArguments()
  logger, fname = setupLogging('runScalabilityTestSuite', None)
  try:
    master = taskdistribution.TaskDistributor(args.test_suite_master_url)
    test_suite_title = args.test_suite_title or args.test_suite
    revision = args.revision

    test_result = master.createTestResult(revision, [test_suite_title],
      args.node_title, True, test_suite_title, 'foo')

    if test_result is None:
      # No test to run.
      logger.info("There is no test to run. Exiting...")
      return

    test_line = test_result.start()
    start_time = time.time()

    args.additional_arguments.append('type=UnitTest')
    success = runTestSuite(
        args.test_suite,
        args.additional_arguments,
        logger.info,
    )

    if success:
      error_count = 0
    else:
      error_count = 1

    test_duration = time.time() - start_time
    max_size = 4096
    fsize = os.stat(fname).st_size
    with open(fname) as f:
      if fsize <= max_size:
        stdout = f.read()
      else:
        # Read only 2048 bytes from the file. The whole
        # file will be available on the server.
        stdout = f.read(2048)
        stdout += "\n[...] File truncated\n"
        f.seek(-2048, os.SEEK_END)
        stdout += f.read()

    test_line.stop(stdout=stdout,
                    test_count=1,
                    error_count=error_count,
                    duration=test_duration)
  except:
    raise
  finally:
    os.remove(fname)
