#!/usr/bin/env python2.7
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"""Run test matrix."""

import argparse
import jobset
import multiprocessing
import os
import report_utils
import sys

_ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
os.chdir(_ROOT)

# Set the timeout high to allow enough time for sanitizers and pre-building
# clang docker.
_RUNTESTS_TIMEOUT = 2*60*60

# Number of jobs assigned to each run_tests.py instance
_INNER_JOBS = 2


def _docker_jobspec(name, runtests_args=[]):
  """Run a single instance of run_tests.py in a docker container"""
  test_job = jobset.JobSpec(
          cmdline=['python', 'tools/run_tests/run_tests.py',
                   '--use_docker',
                   '-t',
                   '-j', str(_INNER_JOBS),
                   '-x', 'report_%s.xml' % name] + runtests_args,
          shortname='run_tests_%s' % name,
          timeout_seconds=_RUNTESTS_TIMEOUT)
  return test_job


def _workspace_jobspec(name, runtests_args=[], workspace_name=None):
  """Run a single instance of run_tests.py in a separate workspace"""
  if not workspace_name:
    workspace_name = 'workspace_%s' % name
  env = {'WORKSPACE_NAME': workspace_name}
  test_job = jobset.JobSpec(
          cmdline=['tools/run_tests/run_tests_in_workspace.sh',
                   '-t',
                   '-j', str(_INNER_JOBS),
                   '-x', '../report_%s.xml' % name] + runtests_args,
          environ=env,
          shortname='run_tests_%s' % name,
          timeout_seconds=_RUNTESTS_TIMEOUT)
  return test_job


def _generate_jobs(languages, configs, platforms,
                  arch=None, compiler=None,
                  labels=[], extra_args=[]):
  result = []
  for language in languages:
    for platform in platforms:
      for config in configs:
        name = '%s_%s_%s' % (language, platform, config)
        runtests_args = ['-l', language,
                         '-c', config]
        if arch or compiler:
          name += '_%s_%s' % (arch, compiler)
          runtests_args += ['--arch', arch,
                            '--compiler', compiler]

        runtests_args += extra_args
        if platform == 'linux':
          job = _docker_jobspec(name=name, runtests_args=runtests_args)
        else:
          job = _workspace_jobspec(name=name, runtests_args=runtests_args)

        job.labels = [platform, config, language] + labels
        result.append(job)
  return result


def _create_test_jobs(extra_args=[]):
  test_jobs = []
  # supported on linux only
  test_jobs += _generate_jobs(languages=['sanity', 'php7'],
                             configs=['dbg', 'opt'],
                             platforms=['linux'],
                             labels=['basictests'],
                             extra_args=extra_args)
  
  # supported on all platforms.
  test_jobs += _generate_jobs(languages=['c', 'csharp', 'node', 'python'],
                             configs=['dbg', 'opt'],
                             platforms=['linux', 'macos', 'windows'],
                             labels=['basictests'],
                             extra_args=extra_args)
  
  # supported on linux and mac.
  test_jobs += _generate_jobs(languages=['c++', 'ruby', 'php'],
                              configs=['dbg', 'opt'],
                              platforms=['linux', 'macos'],
                              labels=['basictests'],
                              extra_args=extra_args)
  
  # supported on mac only.
  test_jobs += _generate_jobs(languages=['objc'],
                              configs=['dbg', 'opt'],
                              platforms=['macos'],
                              labels=['basictests'],
                              extra_args=extra_args)
  
  # sanitizers
  test_jobs += _generate_jobs(languages=['c'],
                              configs=['msan', 'asan', 'tsan'],
                              platforms=['linux'],
                              labels=['sanitizers'],
                              extra_args=extra_args)
  test_jobs += _generate_jobs(languages=['c++'],
                              configs=['asan', 'tsan'],
                              platforms=['linux'],
                              labels=['sanitizers'],
                              extra_args=extra_args)
  return test_jobs

  
def _create_portability_test_jobs(extra_args=[]):
  test_jobs = []
  # portability C x86
  test_jobs += _generate_jobs(languages=['c'],
                              configs=['dbg'],
                              platforms=['linux'],
                              arch='x86',
                              compiler='default',
                              labels=['portability'],
                              extra_args=extra_args)
  
  # portability C and C++ on x64
  for compiler in ['gcc4.4', 'gcc4.6', 'gcc5.3',
                   'clang3.5', 'clang3.6', 'clang3.7']:
    test_jobs += _generate_jobs(languages=['c', 'c++'],
                                configs=['dbg'],
                                platforms=['linux'],
                                arch='x64',
                                compiler=compiler,
                                labels=['portability'],
                                extra_args=extra_args)
  
  # portability C on Windows
  for arch in ['x86', 'x64']:
    for compiler in ['vs2013', 'vs2015']:
      test_jobs += _generate_jobs(languages=['c'],
                                  configs=['dbg'],
                                  platforms=['windows'],
                                  arch=arch,
                                  compiler=compiler,
                                  labels=['portability'],
                                  extra_args=extra_args)
  
  test_jobs += _generate_jobs(languages=['python'],
                              configs=['dbg'],
                              platforms=['linux'],
                              arch='default',
                              compiler='python3.4',
                              labels=['portability'],
                              extra_args=extra_args)
  
  test_jobs += _generate_jobs(languages=['csharp'],
                              configs=['dbg'],
                              platforms=['linux'],
                              arch='default',
                              compiler='coreclr',
                              labels=['portability'],
                              extra_args=extra_args)
  return test_jobs  


def _allowed_labels():
  """Returns a list of existing job labels."""
  all_labels = set()
  for job in _create_test_jobs() + _create_portability_test_jobs():
    for label in job.labels:
      all_labels.add(label)
  return sorted(all_labels)


argp = argparse.ArgumentParser(description='Run a matrix of run_tests.py tests.')
argp.add_argument('-j', '--jobs',
                  default=multiprocessing.cpu_count()/_INNER_JOBS,
                  type=int,
                  help='Number of concurrent run_tests.py instances.')
argp.add_argument('-f', '--filter',
                  choices=_allowed_labels(),
                  nargs='+',
                  default=[],
                  help='Filter targets to run by label with AND semantics.')
argp.add_argument('--build_only',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Pass --build_only flag to run_tests.py instances.')
argp.add_argument('--force_default_poller', default=False, action='store_const', const=True,
                  help='Pass --force_default_poller to run_tests.py instances.')
argp.add_argument('--dry_run',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Only print what would be run.')
args = argp.parse_args()

extra_args = []
if args.build_only:
  extra_args.append('--build_only')
if args.force_default_poller:
  extra_args.append('--force_default_poller')

all_jobs = _create_test_jobs(extra_args=extra_args) + _create_portability_test_jobs(extra_args=extra_args)

jobs = []
for job in all_jobs:
  if not args.filter or all(filter in job.labels for filter in args.filter):
    jobs.append(job)

if not jobs:
  jobset.message('FAILED', 'No test suites match given criteria.',
                 do_newline=True)
  sys.exit(1)
  
print('IMPORTANT: The changes you are testing need to be locally committed')
print('because only the committed changes in the current branch will be')
print('copied to the docker environment or into subworkspaces.')

print 
print 'Will run these tests:'
for job in jobs:
  if args.dry_run:
    print '  %s: "%s"' % (job.shortname, ' '.join(job.cmdline))
  else:
    print '  %s' % job.shortname
print

if args.dry_run:
  print '--dry_run was used, exiting'
  sys.exit(1)

jobset.message('START', 'Running test matrix.', do_newline=True)
num_failures, resultset = jobset.run(jobs,
                                     newline_on_success=True,
                                     travis=True,
                                     maxjobs=args.jobs)
report_utils.render_junit_xml_report(resultset, 'report.xml')

if num_failures == 0:
  jobset.message('SUCCESS', 'All run_tests.py instance finished successfully.',
                 do_newline=True)
else:
  jobset.message('FAILED', 'Some run_tests.py instance have failed.',
                 do_newline=True)
  sys.exit(1)