#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Modifies a tryjob based off of arguments."""

from __future__ import print_function

import argparse
import enum
import json
import os
import sys

from assert_not_in_chroot import VerifyOutsideChroot
from failure_modes import FailureModes
from get_llvm_hash import GetLLVMHashAndVersionFromSVNOption
from update_packages_and_run_tryjobs import RunTryJobs
from update_tryjob_status import FindTryjobIndex
from update_tryjob_status import TryjobStatus
import update_chromeos_llvm_next_hash


class ModifyTryjob(enum.Enum):
  """Options to modify a tryjob."""

  REMOVE = 'remove'
  RELAUNCH = 'relaunch'
  ADD = 'add'


def GetCommandLineArgs():
  """Parses the command line for the command line arguments."""

  # Default path to the chroot if a path is not specified.
  cros_root = os.path.expanduser('~')
  cros_root = os.path.join(cros_root, 'chromiumos')

  # Create parser and add optional command-line arguments.
  parser = argparse.ArgumentParser(
      description='Removes, relaunches, or adds a tryjob.')

  # Add argument for the JSON file to use for the update of a tryjob.
  parser.add_argument(
      '--status_file',
      required=True,
      help='The absolute path to the JSON file that contains the tryjobs used '
      'for bisecting LLVM.')

  # Add argument that determines what action to take on the revision specified.
  parser.add_argument(
      '--modify_tryjob',
      required=True,
      choices=[modify_tryjob.value for modify_tryjob in ModifyTryjob],
      help='What action to perform on the tryjob.')

  # Add argument that determines which revision to search for in the list of
  # tryjobs.
  parser.add_argument(
      '--revision',
      required=True,
      type=int,
      help='The revision to either remove or relaunch.')

  # Add argument for other change lists that want to run alongside the tryjob.
  parser.add_argument(
      '--extra_change_lists',
      type=int,
      nargs='+',
      help='change lists that would like to be run alongside the change list '
      'of updating the packages')

  # Add argument for custom options for the tryjob.
  parser.add_argument(
      '--options',
      required=False,
      nargs='+',
      help='options to use for the tryjob testing')

  # Add argument for the builder to use for the tryjob.
  parser.add_argument('--builder', help='builder to use for the tryjob testing')

  # Add argument for a specific chroot path.
  parser.add_argument(
      '--chroot_path',
      default=cros_root,
      help='the path to the chroot (default: %(default)s)')

  # Add argument for whether to display command contents to `stdout`.
  parser.add_argument(
      '--verbose',
      action='store_true',
      help='display contents of a command to the terminal '
      '(default: %(default)s)')

  args_output = parser.parse_args()

  if not os.path.isfile(args_output.status_file) or \
      not args_output.status_file.endswith('.json'):
    raise ValueError('File does not exist or does not ending in ".json" '
                     ': %s' % args_output.status_file)

  if args_output.modify_tryjob == ModifyTryjob.ADD.value and \
      not args_output.builder:
    raise ValueError('A builder is required for adding a tryjob.')
  elif args_output.modify_tryjob != ModifyTryjob.ADD.value and \
      args_output.builder:
    raise ValueError('Specifying a builder is only available when adding a '
                     'tryjob.')

  return args_output


def GetCLAfterUpdatingPackages(packages, git_hash, svn_version, chroot_path,
                               patch_metadata_file, svn_option):
  """Updates the packages' LLVM_NEXT."""

  change_list = update_chromeos_llvm_next_hash.UpdatePackages(
      packages, git_hash, svn_version, chroot_path, patch_metadata_file,
      FailureModes.DISABLE_PATCHES, svn_option)

  print('\nSuccessfully updated packages to %d' % svn_version)
  print('Gerrit URL: %s' % change_list.url)
  print('Change list number: %d' % change_list.cl_number)

  return change_list


def CreateNewTryjobEntryForBisection(cl, extra_cls, options, builder,
                                     chroot_path, verbose, cl_url, revision):
  """Submits a tryjob and adds additional information."""

  # Get the tryjob results after submitting the tryjob.
  # Format of 'tryjob_results':
  # [
  #   {
  #     'link' : [TRYJOB_LINK],
  #     'buildbucket_id' : [BUILDBUCKET_ID],
  #     'extra_cls' : [EXTRA_CLS_LIST],
  #     'options' : [EXTRA_OPTIONS_LIST],
  #     'builder' : [BUILDER_AS_A_LIST]
  #   }
  # ]
  tryjob_results = RunTryJobs(cl, extra_cls, options, [builder], chroot_path,
                              verbose)
  print('\nTryjob:')
  print(tryjob_results[0])

  # Add necessary information about the tryjob.
  tryjob_results[0]['url'] = cl_url
  tryjob_results[0]['rev'] = revision
  tryjob_results[0]['status'] = TryjobStatus.PENDING.value
  tryjob_results[0]['cl'] = cl

  return tryjob_results[0]


def AddTryjob(packages, git_hash, revision, chroot_path, patch_metadata_file,
              extra_cls, options, builder, verbose, svn_option):
  """Submits a tryjob."""

  update_chromeos_llvm_next_hash.verbose = verbose

  change_list = GetCLAfterUpdatingPackages(packages, git_hash, revision,
                                           chroot_path, patch_metadata_file,
                                           svn_option)

  tryjob_dict = CreateNewTryjobEntryForBisection(
      change_list.cl_number, extra_cls, options, builder, chroot_path, verbose,
      change_list.url, revision)

  return tryjob_dict


def PerformTryjobModification(revision, modify_tryjob, status_file, extra_cls,
                              options, builder, chroot_path, verbose):
  """Removes, relaunches, or adds a tryjob.

  Args:
    revision: The revision associated with the tryjob.
    modify_tryjob: What action to take on the tryjob.
      Ex: ModifyTryjob.REMOVE, ModifyTryjob.RELAUNCH, ModifyTryjob.ADD
    status_file: The .JSON file that contains the tryjobs.
    extra_cls: Extra change lists to be run alongside tryjob
    options: Extra options to pass into 'cros tryjob'.
    builder: The builder to use for 'cros tryjob'.
    chroot_path: The absolute path to the chroot (used by 'cros tryjob' when
    relaunching a tryjob).
    verbose: Determines whether to print the contents of a command to `stdout`.
  """

  # Format of 'bisect_contents':
  # {
  #   'start': [START_REVISION_OF_BISECTION]
  #   'end': [END_REVISION_OF_BISECTION]
  #   'jobs' : [
  #       {[TRYJOB_INFORMATION]},
  #       {[TRYJOB_INFORMATION]},
  #       ...,
  #       {[TRYJOB_INFORMATION]}
  #   ]
  # }
  with open(status_file) as tryjobs:
    bisect_contents = json.load(tryjobs)

  if not bisect_contents['jobs'] and modify_tryjob != ModifyTryjob.ADD:
    sys.exit('No tryjobs in %s' % status_file)

  tryjob_index = FindTryjobIndex(revision, bisect_contents['jobs'])

  # 'FindTryjobIndex()' returns None if the tryjob was not found.
  if tryjob_index is None and modify_tryjob != ModifyTryjob.ADD:
    raise ValueError(
        'Unable to find tryjob for %d in %s' % (revision, status_file))

  # Determine the action to take based off of 'modify_tryjob'.
  if modify_tryjob == ModifyTryjob.REMOVE:
    del bisect_contents['jobs'][tryjob_index]

    print('Successfully deleted the tryjob of revision %d' % revision)
  elif modify_tryjob == ModifyTryjob.RELAUNCH:
    # Need to update the tryjob link and buildbucket ID.
    tryjob_results = RunTryJobs(
        bisect_contents['jobs'][tryjob_index]['cl'],
        bisect_contents['jobs'][tryjob_index]['extra_cls'],
        bisect_contents['jobs'][tryjob_index]['options'],
        bisect_contents['jobs'][tryjob_index]['builder'], chroot_path, verbose)

    bisect_contents['jobs'][tryjob_index]['status'] = TryjobStatus.PENDING.value
    bisect_contents['jobs'][tryjob_index]['link'] = tryjob_results[0]['link']
    bisect_contents['jobs'][tryjob_index]['buildbucket_id'] = tryjob_results[0][
        'buildbucket_id']

    print('Successfully relaunched the tryjob for revision %d and updated '
          'the tryjob link to %s' % (revision, tryjob_results[0]['link']))
  elif modify_tryjob == ModifyTryjob.ADD:
    # Tryjob exists already.
    if tryjob_index is not None:
      raise ValueError('Tryjob already exists (index is %d) in %s.' %
                       (tryjob_index, status_file))

    # Make sure the revision is within the bounds of the start and end of the
    # bisection.
    elif bisect_contents['start'] < revision < bisect_contents['end']:
      update_packages = [
          'sys-devel/llvm', 'sys-libs/compiler-rt', 'sys-libs/libcxx',
          'sys-libs/libcxxabi', 'sys-libs/llvm-libunwind'
      ]

      patch_metadata_file = 'PATCHES.json'

      git_hash, revision = GetLLVMHashAndVersionFromSVNOption(revision)

      tryjob_dict = AddTryjob(update_packages, git_hash, revision, chroot_path,
                              patch_metadata_file, extra_cls, options, builder,
                              verbose, revision)

      bisect_contents['jobs'].append(tryjob_dict)

      print('Successfully added tryjob of revision %d' % revision)
    else:
      raise ValueError('Failed to add tryjob to %s' % status_file)
  else:
    raise ValueError(
        'Invalid "modify_tryjob" option provided: %s' % modify_tryjob)

  with open(status_file, 'w') as update_tryjobs:
    json.dump(bisect_contents, update_tryjobs, indent=4, separators=(',', ': '))


def main():
  """Removes, relaunches, or adds a tryjob."""

  VerifyOutsideChroot()

  args_output = GetCommandLineArgs()

  PerformTryjobModification(
      args_output.revision, ModifyTryjob(
          args_output.modify_tryjob), args_output.status_file,
      args_output.extra_change_lists, args_output.options, args_output.builder,
      args_output.chroot_path, args_output.verbose)


if __name__ == '__main__':
  main()