#!/usr/bin/env python
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"""Runs selected gRPC test/build tasks."""

from __future__ import print_function

import argparse
import multiprocessing
import sys

import artifacts.artifact_targets as artifact_targets
import artifacts.distribtest_targets as distribtest_targets
import artifacts.package_targets as package_targets
import python_utils.jobset as jobset

_TARGETS = []
_TARGETS += artifact_targets.targets()
_TARGETS += distribtest_targets.targets()
_TARGETS += package_targets.targets()

def _create_build_map():
  """Maps task names and labels to list of tasks to be built."""
  target_build_map = dict([(target.name, [target])
                           for target in _TARGETS])
  if len(_TARGETS) > len(target_build_map.keys()):
    raise Exception('Target names need to be unique')

  label_build_map = {}
  label_build_map['all'] = [t for t in _TARGETS]  # to build all targets
  for target in _TARGETS:
    for label in target.labels:
      if label in label_build_map:
        label_build_map[label].append(target)
      else:
        label_build_map[label] = [target]

  if set(target_build_map.keys()).intersection(label_build_map.keys()):
    raise Exception('Target names need to be distinct from label names')
  return dict( target_build_map.items() + label_build_map.items())


_BUILD_MAP = _create_build_map()

argp = argparse.ArgumentParser(description='Runs build/test targets.')
argp.add_argument('-b', '--build',
                  choices=sorted(_BUILD_MAP.keys()),
                  nargs='+',
                  default=['all'],
                  help='Target name or target label to build.')
argp.add_argument('-f', '--filter',
                  choices=sorted(_BUILD_MAP.keys()),
                  nargs='+',
                  default=[],
                  help='Filter targets to build with AND semantics.')
argp.add_argument('-j', '--jobs', default=multiprocessing.cpu_count(), type=int)
argp.add_argument('-t', '--travis',
                  default=False,
                  action='store_const',
                  const=True)

args = argp.parse_args()

# Figure out which targets to build
targets = []
for label in args.build:
  targets += _BUILD_MAP[label]

# Among targets selected by -b, filter out those that don't match the filter
targets = [t for t in targets if all(f in t.labels for f in args.filter)]
targets = sorted(set(targets))

# Execute pre-build phase
prebuild_jobs = []
for target in targets:
  prebuild_jobs += target.pre_build_jobspecs()
if prebuild_jobs:
  num_failures, _ = jobset.run(
    prebuild_jobs, newline_on_success=True, maxjobs=args.jobs)
  if num_failures != 0:
    jobset.message('FAILED', 'Pre-build phase failed.', do_newline=True)
    sys.exit(1)

build_jobs = []
for target in targets:
  build_jobs.append(target.build_jobspec())
if not build_jobs:
  print('Nothing to build.')
  sys.exit(1)

jobset.message('START', 'Building targets.', do_newline=True)
num_failures, _ = jobset.run(
    build_jobs, newline_on_success=True, maxjobs=args.jobs)
if num_failures == 0:
  jobset.message('SUCCESS', 'All targets built successfully.',
                 do_newline=True)
else:
  jobset.message('FAILED', 'Failed to build targets.',
                 do_newline=True)
  sys.exit(1)