# Copyright 2012 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


import multiprocessing
import os
import threading
import time

from . import commands
from . import utils


BREAK_NOW = -1
EXCEPTION = -2


class Job(object):
  def __init__(self, command, dep_command, test_id, timeout, verbose):
    self.command = command
    self.dep_command = dep_command
    self.id = test_id
    self.timeout = timeout
    self.verbose = verbose


def RunTest(job):
  try:
    start_time = time.time()
    if job.dep_command is not None:
      dep_output = commands.Execute(job.dep_command, job.verbose, job.timeout)
      # TODO(jkummerow): We approximate the test suite specific function
      # IsFailureOutput() by just checking the exit code here. Currently
      # only cctests define dependencies, for which this simplification is
      # correct.
      if dep_output.exit_code != 0:
        return (job.id, dep_output, time.time() - start_time)
    output = commands.Execute(job.command, job.verbose, job.timeout)
    return (job.id, output, time.time() - start_time)
  except KeyboardInterrupt:
    return (-1, BREAK_NOW, 0)
  except Exception, e:
    print(">>> EXCEPTION: %s" % e)
    return (-1, EXCEPTION, 0)


class Runner(object):

  def __init__(self, suites, progress_indicator, context):
    self.tests = [ t for s in suites for t in s.tests ]
    self._CommonInit(len(self.tests), progress_indicator, context)

  def _CommonInit(self, num_tests, progress_indicator, context):
    self.indicator = progress_indicator
    progress_indicator.runner = self
    self.context = context
    self.succeeded = 0
    self.total = num_tests
    self.remaining = num_tests
    self.failed = []
    self.crashed = 0
    self.terminate = False
    self.lock = threading.Lock()

  def Run(self, jobs):
    self.indicator.Starting()
    self._RunInternal(jobs)
    self.indicator.Done()
    if self.failed:
      return 1
    return 0

  def _RunInternal(self, jobs):
    pool = multiprocessing.Pool(processes=jobs)
    test_map = {}
    queue = []
    queued_exception = None
    for test in self.tests:
      assert test.id >= 0
      test_map[test.id] = test
      try:
        command = self.GetCommand(test)
      except Exception, e:
        # If this failed, save the exception and re-raise it later (after
        # all other tests have had a chance to run).
        queued_exception = e
        continue
      timeout = self.context.timeout
      if ("--stress-opt" in test.flags or
          "--stress-opt" in self.context.mode_flags or
          "--stress-opt" in self.context.extra_flags):
        timeout *= 4
      if test.dependency is not None:
        dep_command = [ c.replace(test.path, test.dependency) for c in command ]
      else:
        dep_command = None
      job = Job(command, dep_command, test.id, timeout, self.context.verbose)
      queue.append(job)
    try:
      kChunkSize = 1
      it = pool.imap_unordered(RunTest, queue, kChunkSize)
      for result in it:
        test_id = result[0]
        if test_id < 0:
          if result[1] == BREAK_NOW:
            self.terminate = True
          else:
            continue
        if self.terminate:
          pool.terminate()
          pool.join()
          raise BreakNowException("User pressed Ctrl+C or IO went wrong")
        test = test_map[test_id]
        self.indicator.AboutToRun(test)
        test.output = result[1]
        test.duration = result[2]
        if test.suite.HasUnexpectedOutput(test):
          self.failed.append(test)
          if test.output.HasCrashed():
            self.crashed += 1
        else:
          self.succeeded += 1
        self.remaining -= 1
        self.indicator.HasRun(test)
    except KeyboardInterrupt:
      pool.terminate()
      pool.join()
      raise
    except Exception, e:
      print("Exception: %s" % e)
      pool.terminate()
      pool.join()
      raise
    if queued_exception:
      raise queued_exception
    return


  def GetCommand(self, test):
    d8testflag = []
    shell = test.suite.shell()
    if shell == "d8":
      d8testflag = ["--test"]
    if utils.IsWindows():
      shell += ".exe"
    cmd = ([self.context.command_prefix] +
           [os.path.abspath(os.path.join(self.context.shell_dir, shell))] +
           d8testflag +
           test.suite.GetFlagsForTestCase(test, self.context) +
           [self.context.extra_flags])
    return cmd


class BreakNowException(Exception):
  def __init__(self, value):
    self.value = value
  def __str__(self):
    return repr(self.value)