# Copyright 2015, VIXL authors
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#
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# modification, are permitted provided that the following conditions are met:
#
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#     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.
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#     used to endorse or promote products derived from this software without
#     specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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import collections
import multiprocessing
import re
import time

import printer
import thread_pool

REGEXP_MISSING_FEATURES = "Missing features: { ([^,}]+(, [^,}]+)*) }"

class Test(object):
  # Shared state for multiprocessing. Ideally the context should be passed with
  # arguments, but constraints from the multiprocessing module prevent us from
  # doing so: the shared variables (multiprocessing.Value) must be either global
  # or static, or no work is started.
  n_tests_passed = multiprocessing.Value('i', 0)
  n_tests_failed = multiprocessing.Value('i', 0)
  n_tests_skipped = multiprocessing.Value('i', 0)

  def __init__(self, name, shared, **kwargs):
    self.name = name
    self.shared = shared
    self.args = kwargs

class TestQueue(object):
  def __init__(self, prefix = ''):
    self.progress_prefix = prefix
    self.queue = []
    self.tests_skipped = None
    self.n_known_failures = 0
    self.known_failures = collections.Counter()

  def AddKnownFailures(self, reason, n_tests):
    self.n_known_failures += n_tests
    self.known_failures[reason] += n_tests

  def AddTest(self, name, **kwargs):
    self.queue.append(Test(name, self, **kwargs))

  # Run the specified tests.
  def Run(self, jobs, verbose, run_function):
    with multiprocessing.Manager() as manager:
      def InitGlobals():
        # Initialisation.
        self.start_time = time.time()
        self.n_tests = len(self.queue)
        if self.n_tests == 0:
          printer.Print('No tests to run.')
          return False
        Test.n_tests_passed.value = 0
        Test.n_tests_failed.value = 0
        Test.n_tests_skipped.value = 0
        self.tests_skipped = manager.dict()
        return True

      thread_pool.Multithread(run_function, self.queue, jobs, InitGlobals)

      printer.UpdateProgress(self.start_time,
                             Test.n_tests_passed.value,
                             Test.n_tests_failed.value,
                             self.n_tests,
                             Test.n_tests_skipped.value,
                             self.n_known_failures,
                             '== Done ==',
                             prevent_next_overwrite = True,
                             prefix = self.progress_prefix)
      n_tests_features = 0
      features = set()
      for reason, n_tests in self.tests_skipped.items():
        m = re.match(REGEXP_MISSING_FEATURES, reason)
        if m:
          if verbose:
            printer.Print("%d tests skipped because the following features are "
                          "not available '%s'" % (n_tests, m.group(1)))
          else:
            n_tests_features += n_tests
            features.update(m.group(1).split(', '))
        else:
          printer.Print("%d tests skipped because '%s'" % (n_tests, reason))

      n_tests_other = 0
      if n_tests_features > 0 :
        printer.Print("%d tests skipped because the CPU does not support "
                      "the following features: '%s'" %
                      (n_tests_features, ", ".join(features)))

      for reason, n_tests in self.known_failures.items():
          printer.Print("%d tests skipped because '%s'" % (n_tests, reason))

      # Empty the queue now that the tests have been run.
      self.queue = []
      # `0` indicates success
      return Test.n_tests_failed.value