# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import copy
import functools
import optparse
import re
import sys
from typing import List

from command import DEFAULT_LOCAL_JOBS, InteractiveCommand
from editor import Editor
from error import UploadError
from git_command import GitCommand
from git_refs import R_HEADS
from hooks import RepoHook
from project import ReviewableBranch


_DEFAULT_UNUSUAL_COMMIT_THRESHOLD = 5


def _VerifyPendingCommits(branches: List[ReviewableBranch]) -> bool:
  """Perform basic safety checks on the given set of branches.

  Ensures that each branch does not have a "large" number of commits
  and, if so, prompts the user to confirm they want to proceed with
  the upload.

  Returns true if all branches pass the safety check or the user
  confirmed. Returns false if the upload should be aborted.
  """

  # Determine if any branch has a suspicious number of commits.
  many_commits = False
  for branch in branches:
    # Get the user's unusual threshold for the branch.
    #
    # Each branch may be configured to have a different threshold.
    remote = branch.project.GetBranch(branch.name).remote
    key = f'review.{remote.review}.uploadwarningthreshold'
    threshold = branch.project.config.GetInt(key)
    if threshold is None:
      threshold = _DEFAULT_UNUSUAL_COMMIT_THRESHOLD

    # If the branch has more commits than the threshold, show a warning.
    if len(branch.commits) > threshold:
      many_commits = True
      break

  # If any branch has many commits, prompt the user.
  if many_commits:
    if len(branches) > 1:
      print('ATTENTION: One or more branches has an unusually high number '
            'of commits.')
    else:
      print('ATTENTION: You are uploading an unusually high number of commits.')
    print('YOU PROBABLY DO NOT MEAN TO DO THIS. (Did you rebase across '
          'branches?)')
    answer = input(
        "If you are sure you intend to do this, type 'yes': ").strip()
    return answer == 'yes'

  return True


def _die(fmt, *args):
  msg = fmt % args
  print('error: %s' % msg, file=sys.stderr)
  sys.exit(1)


def _SplitEmails(values):
  result = []
  for value in values:
    result.extend([s.strip() for s in value.split(',')])
  return result


class Upload(InteractiveCommand):
  COMMON = True
  helpSummary = "Upload changes for code review"
  helpUsage = """
%prog [--re --cc] [<project>]...
"""
  helpDescription = """
The '%prog' command is used to send changes to the Gerrit Code
Review system.  It searches for topic branches in local projects
that have not yet been published for review.  If multiple topic
branches are found, '%prog' opens an editor to allow the user to
select which branches to upload.

'%prog' searches for uploadable changes in all projects listed at
the command line.  Projects can be specified either by name, or by
a relative or absolute path to the project's local directory. If no
projects are specified, '%prog' will search for uploadable changes
in all projects listed in the manifest.

If the --reviewers or --cc options are passed, those emails are
added to the respective list of users, and emails are sent to any
new users.  Users passed as --reviewers must already be registered
with the code review system, or the upload will fail.

While most normal Gerrit options have dedicated command line options,
direct access to the Gerit options is available via --push-options.
This is useful when Gerrit has newer functionality that %prog doesn't
yet support, or doesn't have plans to support.  See the Push Options
documentation for more details:
https://gerrit-review.googlesource.com/Documentation/user-upload.html#push_options

# Configuration

review.URL.autoupload:

To disable the "Upload ... (y/N)?" prompt, you can set a per-project
or global Git configuration option.  If review.URL.autoupload is set
to "true" then repo will assume you always answer "y" at the prompt,
and will not prompt you further.  If it is set to "false" then repo
will assume you always answer "n", and will abort.

review.URL.autoreviewer:

To automatically append a user or mailing list to reviews, you can set
a per-project or global Git option to do so.

review.URL.autocopy:

To automatically copy a user or mailing list to all uploaded reviews,
you can set a per-project or global Git option to do so. Specifically,
review.URL.autocopy can be set to a comma separated list of reviewers
who you always want copied on all uploads with a non-empty --re
argument.

review.URL.username:

Override the username used to connect to Gerrit Code Review.
By default the local part of the email address is used.

The URL must match the review URL listed in the manifest XML file,
or in the .git/config within the project.  For example:

  [remote "origin"]
    url = git://git.example.com/project.git
    review = http://review.example.com/

  [review "http://review.example.com/"]
    autoupload = true
    autocopy = johndoe@company.com,my-team-alias@company.com

review.URL.uploadtopic:

To add a topic branch whenever uploading a commit, you can set a
per-project or global Git option to do so. If review.URL.uploadtopic
is set to "true" then repo will assume you always want the equivalent
of the -t option to the repo command. If unset or set to "false" then
repo will make use of only the command line option.

review.URL.uploadhashtags:

To add hashtags whenever uploading a commit, you can set a per-project
or global Git option to do so. The value of review.URL.uploadhashtags
will be used as comma delimited hashtags like the --hashtag option.

review.URL.uploadlabels:

To add labels whenever uploading a commit, you can set a per-project
or global Git option to do so. The value of review.URL.uploadlabels
will be used as comma delimited labels like the --label option.

review.URL.uploadnotify:

Control e-mail notifications when uploading.
https://gerrit-review.googlesource.com/Documentation/user-upload.html#notify

review.URL.uploadwarningthreshold:

Repo will warn you if you are attempting to upload a large number
of commits in one or more branches. By default, the threshold
is five commits. This option allows you to override the warning
threshold to a different value.

# References

Gerrit Code Review:  https://www.gerritcodereview.com/

"""
  PARALLEL_JOBS = DEFAULT_LOCAL_JOBS

  def _Options(self, p):
    p.add_option('-t',
                 dest='auto_topic', action='store_true',
                 help='send local branch name to Gerrit Code Review')
    p.add_option('--hashtag', '--ht',
                 dest='hashtags', action='append', default=[],
                 help='add hashtags (comma delimited) to the review')
    p.add_option('--hashtag-branch', '--htb',
                 action='store_true',
                 help='add local branch name as a hashtag')
    p.add_option('-l', '--label',
                 dest='labels', action='append', default=[],
                 help='add a label when uploading')
    p.add_option('--re', '--reviewers',
                 type='string', action='append', dest='reviewers',
                 help='request reviews from these people')
    p.add_option('--cc',
                 type='string', action='append', dest='cc',
                 help='also send email to these email addresses')
    p.add_option('--br', '--branch',
                 type='string', action='store', dest='branch',
                 help='(local) branch to upload')
    p.add_option('-c', '--current-branch',
                 dest='current_branch', action='store_true',
                 help='upload current git branch')
    p.add_option('--no-current-branch',
                 dest='current_branch', action='store_false',
                 help='upload all git branches')
    # Turn this into a warning & remove this someday.
    p.add_option('--cbr',
                 dest='current_branch', action='store_true',
                 help=optparse.SUPPRESS_HELP)
    p.add_option('--ne', '--no-emails',
                 action='store_false', dest='notify', default=True,
                 help='do not send e-mails on upload')
    p.add_option('-p', '--private',
                 action='store_true', dest='private', default=False,
                 help='upload as a private change (deprecated; use --wip)')
    p.add_option('-w', '--wip',
                 action='store_true', dest='wip', default=False,
                 help='upload as a work-in-progress change')
    p.add_option('-r', '--ready',
                 action='store_true', default=False,
                 help='mark change as ready (clears work-in-progress setting)')
    p.add_option('-o', '--push-option',
                 type='string', action='append', dest='push_options',
                 default=[],
                 help='additional push options to transmit')
    p.add_option('-D', '--destination', '--dest',
                 type='string', action='store', dest='dest_branch',
                 metavar='BRANCH',
                 help='submit for review on this target branch')
    p.add_option('-n', '--dry-run',
                 dest='dryrun', default=False, action='store_true',
                 help='do everything except actually upload the CL')
    p.add_option('-y', '--yes',
                 default=False, action='store_true',
                 help='answer yes to all safe prompts')
    p.add_option('--ignore-untracked-files',
                 action='store_true', default=False,
                 help='ignore untracked files in the working copy')
    p.add_option('--no-ignore-untracked-files',
                 dest='ignore_untracked_files', action='store_false',
                 help='always ask about untracked files in the working copy')
    p.add_option('--no-cert-checks',
                 dest='validate_certs', action='store_false', default=True,
                 help='disable verifying ssl certs (unsafe)')
    RepoHook.AddOptionGroup(p, 'pre-upload')

  def _SingleBranch(self, opt, branch, people):
    project = branch.project
    name = branch.name
    remote = project.GetBranch(name).remote

    key = 'review.%s.autoupload' % remote.review
    answer = project.config.GetBoolean(key)

    if answer is False:
      _die("upload blocked by %s = false" % key)

    if answer is None:
      date = branch.date
      commit_list = branch.commits

      destination = opt.dest_branch or project.dest_branch or project.revisionExpr
      print('Upload project %s/ to remote branch %s%s:' %
            (project.RelPath(local=opt.this_manifest_only), destination,
             ' (private)' if opt.private else ''))
      print('  branch %s (%2d commit%s, %s):' % (
          name,
          len(commit_list),
          len(commit_list) != 1 and 's' or '',
          date))
      for commit in commit_list:
        print('         %s' % commit)

      print('to %s (y/N)? ' % remote.review, end='', flush=True)
      if opt.yes:
        print('<--yes>')
        answer = True
      else:
        answer = sys.stdin.readline().strip().lower()
        answer = answer in ('y', 'yes', '1', 'true', 't')
      if not answer:
        _die("upload aborted by user")

    # Perform some basic safety checks prior to uploading.
    if not opt.yes and not _VerifyPendingCommits([branch]):
      _die("upload aborted by user")

    self._UploadAndReport(opt, [branch], people)

  def _MultipleBranches(self, opt, pending, people):
    projects = {}
    branches = {}

    script = []
    script.append('# Uncomment the branches to upload:')
    for project, avail in pending:
      project_path = project.RelPath(local=opt.this_manifest_only)
      script.append('#')
      script.append(f'# project {project_path}/:')

      b = {}
      for branch in avail:
        if branch is None:
          continue
        name = branch.name
        date = branch.date
        commit_list = branch.commits

        if b:
          script.append('#')
        destination = opt.dest_branch or project.dest_branch or project.revisionExpr
        script.append('#  branch %s (%2d commit%s, %s) to remote branch %s:' % (
                      name,
                      len(commit_list),
                      len(commit_list) != 1 and 's' or '',
                      date,
                      destination))
        for commit in commit_list:
          script.append('#         %s' % commit)
        b[name] = branch

      projects[project_path] = project
      branches[project_path] = b
    script.append('')

    script = Editor.EditString("\n".join(script)).split("\n")

    project_re = re.compile(r'^#?\s*project\s*([^\s]+)/:$')
    branch_re = re.compile(r'^\s*branch\s*([^\s(]+)\s*\(.*')

    project = None
    todo = []

    for line in script:
      m = project_re.match(line)
      if m:
        name = m.group(1)
        project = projects.get(name)
        if not project:
          _die('project %s not available for upload', name)
        continue

      m = branch_re.match(line)
      if m:
        name = m.group(1)
        if not project:
          _die('project for branch %s not in script', name)
        project_path = project.RelPath(local=opt.this_manifest_only)
        branch = branches[project_path].get(name)
        if not branch:
          _die('branch %s not in %s', name, project_path)
        todo.append(branch)
    if not todo:
      _die("nothing uncommented for upload")

    # Perform some basic safety checks prior to uploading.
    if not opt.yes and not _VerifyPendingCommits(todo):
      _die("upload aborted by user")

    self._UploadAndReport(opt, todo, people)

  def _AppendAutoList(self, branch, people):
    """
    Appends the list of reviewers in the git project's config.
    Appends the list of users in the CC list in the git project's config if a
    non-empty reviewer list was found.
    """
    name = branch.name
    project = branch.project

    key = 'review.%s.autoreviewer' % project.GetBranch(name).remote.review
    raw_list = project.config.GetString(key)
    if raw_list is not None:
      people[0].extend([entry.strip() for entry in raw_list.split(',')])

    key = 'review.%s.autocopy' % project.GetBranch(name).remote.review
    raw_list = project.config.GetString(key)
    if raw_list is not None and len(people[0]) > 0:
      people[1].extend([entry.strip() for entry in raw_list.split(',')])

  def _FindGerritChange(self, branch):
    last_pub = branch.project.WasPublished(branch.name)
    if last_pub is None:
      return ""

    refs = branch.GetPublishedRefs()
    try:
      # refs/changes/XYZ/N --> XYZ
      return refs.get(last_pub).split('/')[-2]
    except (AttributeError, IndexError):
      return ""

  def _UploadAndReport(self, opt, todo, original_people):
    have_errors = False
    for branch in todo:
      try:
        people = copy.deepcopy(original_people)
        self._AppendAutoList(branch, people)

        # Check if there are local changes that may have been forgotten
        changes = branch.project.UncommitedFiles()
        if opt.ignore_untracked_files:
          untracked = set(branch.project.UntrackedFiles())
          changes = [x for x in changes if x not in untracked]

        if changes:
          key = 'review.%s.autoupload' % branch.project.remote.review
          answer = branch.project.config.GetBoolean(key)

          # if they want to auto upload, let's not ask because it could be automated
          if answer is None:
            print()
            print('Uncommitted changes in %s (did you forget to amend?):'
                  % branch.project.name)
            print('\n'.join(changes))
            print('Continue uploading? (y/N) ', end='', flush=True)
            if opt.yes:
              print('<--yes>')
              a = 'yes'
            else:
              a = sys.stdin.readline().strip().lower()
            if a not in ('y', 'yes', 't', 'true', 'on'):
              print("skipping upload", file=sys.stderr)
              branch.uploaded = False
              branch.error = 'User aborted'
              continue

        # Check if topic branches should be sent to the server during upload
        if opt.auto_topic is not True:
          key = 'review.%s.uploadtopic' % branch.project.remote.review
          opt.auto_topic = branch.project.config.GetBoolean(key)

        def _ExpandCommaList(value):
          """Split |value| up into comma delimited entries."""
          if not value:
            return
          for ret in value.split(','):
            ret = ret.strip()
            if ret:
              yield ret

        # Check if hashtags should be included.
        key = 'review.%s.uploadhashtags' % branch.project.remote.review
        hashtags = set(_ExpandCommaList(branch.project.config.GetString(key)))
        for tag in opt.hashtags:
          hashtags.update(_ExpandCommaList(tag))
        if opt.hashtag_branch:
          hashtags.add(branch.name)

        # Check if labels should be included.
        key = 'review.%s.uploadlabels' % branch.project.remote.review
        labels = set(_ExpandCommaList(branch.project.config.GetString(key)))
        for label in opt.labels:
          labels.update(_ExpandCommaList(label))

        # Handle e-mail notifications.
        if opt.notify is False:
          notify = 'NONE'
        else:
          key = 'review.%s.uploadnotify' % branch.project.remote.review
          notify = branch.project.config.GetString(key)

        destination = opt.dest_branch or branch.project.dest_branch

        if branch.project.dest_branch and not opt.dest_branch:

          merge_branch = self._GetMergeBranch(
            branch.project, local_branch=branch.name)

          full_dest = destination
          if not full_dest.startswith(R_HEADS):
            full_dest = R_HEADS + full_dest

          # If the merge branch of the local branch is different from the
          # project's revision AND destination, this might not be intentional.
          if (merge_branch and merge_branch != branch.project.revisionExpr
              and merge_branch != full_dest):
            print(f'For local branch {branch.name}: merge branch '
                  f'{merge_branch} does not match destination branch '
                  f'{destination}')
            print('skipping upload.')
            print(f'Please use `--destination {destination}` if this is intentional')
            branch.uploaded = False
            continue

        branch.UploadForReview(people,
                               dryrun=opt.dryrun,
                               auto_topic=opt.auto_topic,
                               hashtags=hashtags,
                               labels=labels,
                               private=opt.private,
                               notify=notify,
                               wip=opt.wip,
                               ready=opt.ready,
                               dest_branch=destination,
                               validate_certs=opt.validate_certs,
                               push_options=opt.push_options)

        branch.uploaded = True
      except UploadError as e:
        branch.error = e
        branch.uploaded = False
        have_errors = True

    print(file=sys.stderr)
    print('----------------------------------------------------------------------', file=sys.stderr)

    if have_errors:
      for branch in todo:
        if not branch.uploaded:
          if len(str(branch.error)) <= 30:
            fmt = ' (%s)'
          else:
            fmt = '\n       (%s)'
          print(('[FAILED] %-15s %-15s' + fmt) % (
              branch.project.RelPath(local=opt.this_manifest_only) + '/',
              branch.name,
              str(branch.error)),
              file=sys.stderr)
      print()

    for branch in todo:
      if branch.uploaded:
        print('[OK    ] %-15s %s' % (
            branch.project.RelPath(local=opt.this_manifest_only) + '/',
            branch.name),
            file=sys.stderr)

    if have_errors:
      sys.exit(1)

  def _GetMergeBranch(self, project, local_branch=None):
    if local_branch is None:
      p = GitCommand(project,
                     ['rev-parse', '--abbrev-ref', 'HEAD'],
                     capture_stdout=True,
                     capture_stderr=True)
      p.Wait()
      local_branch = p.stdout.strip()
    p = GitCommand(project,
                   ['config', '--get', 'branch.%s.merge' % local_branch],
                   capture_stdout=True,
                   capture_stderr=True)
    p.Wait()
    merge_branch = p.stdout.strip()
    return merge_branch

  @staticmethod
  def _GatherOne(opt, project):
    """Figure out the upload status for |project|."""
    if opt.current_branch:
      cbr = project.CurrentBranch
      up_branch = project.GetUploadableBranch(cbr)
      avail = [up_branch] if up_branch else None
    else:
      avail = project.GetUploadableBranches(opt.branch)
    return (project, avail)

  def Execute(self, opt, args):
    projects = self.GetProjects(args, all_manifests=not opt.this_manifest_only)

    def _ProcessResults(_pool, _out, results):
      pending = []
      for result in results:
        project, avail = result
        if avail is None:
          print('repo: error: %s: Unable to upload branch "%s". '
                'You might be able to fix the branch by running:\n'
                '  git branch --set-upstream-to m/%s' %
                (project.RelPath(local=opt.this_manifest_only), project.CurrentBranch,
                 project.manifest.branch),
                file=sys.stderr)
        elif avail:
          pending.append(result)
      return pending

    pending = self.ExecuteInParallel(
        opt.jobs,
        functools.partial(self._GatherOne, opt),
        projects,
        callback=_ProcessResults)

    if not pending:
      if opt.branch is None:
        print('repo: error: no branches ready for upload', file=sys.stderr)
      else:
        print('repo: error: no branches named "%s" ready for upload' %
              (opt.branch,), file=sys.stderr)
      return 1

    manifests = {project.manifest.topdir: project.manifest
                 for (project, available) in pending}
    ret = 0
    for manifest in manifests.values():
      pending_proj_names = [project.name for (project, available) in pending
                            if project.manifest.topdir == manifest.topdir]
      pending_worktrees = [project.worktree for (project, available) in pending
                           if project.manifest.topdir == manifest.topdir]
      hook = RepoHook.FromSubcmd(
          hook_type='pre-upload', manifest=manifest,
          opt=opt, abort_if_user_denies=True)
      if not hook.Run(project_list=pending_proj_names,
                      worktree_list=pending_worktrees):
        ret = 1
    if ret:
      return ret

    reviewers = _SplitEmails(opt.reviewers) if opt.reviewers else []
    cc = _SplitEmails(opt.cc) if opt.cc else []
    people = (reviewers, cc)

    if len(pending) == 1 and len(pending[0][1]) == 1:
      self._SingleBranch(opt, pending[0][1][0], people)
    else:
      self._MultipleBranches(opt, pending, people)