# frozen_string_literal: true
# rubocop:disable Style/SignalException

SEE_DOC = "See the [feature flag documentation](https://docs.gitlab.com/ee/development/feature_flags/development.html#feature-flag-definition-and-validation)."

SUGGEST_MR_COMMENT = <<~SUGGEST_COMMENT
```suggestion
group: "%<group>s"
```

#{SEE_DOC}
SUGGEST_COMMENT

def check_feature_flag_yaml(feature_flag)
  mr_group_label = helper.group_label(gitlab.mr_labels)

  if feature_flag.group.nil?
    message_for_feature_flag_missing_group!(feature_flag: feature_flag, mr_group_label: mr_group_label)
  else
    message_for_feature_flag_with_group!(feature_flag: feature_flag, mr_group_label: mr_group_label)
  end
rescue Psych::Exception
  # YAML could not be parsed, fail the build.
  fail "#{gitlab.html_link(feature_flag.path)} isn't valid YAML! #{SEE_DOC}"
rescue StandardError => e
  warn "There was a problem trying to check the Feature Flag file. Exception: #{e.class.name} - #{e.message}"
end

def message_for_feature_flag_missing_group!(feature_flag:, mr_group_label:)
  if mr_group_label.nil?
    warn "Consider setting `group` in #{gitlab.html_link(feature_flag.path)}. #{SEE_DOC}"
  else
    mr_line = feature_flag.raw.lines.find_index("group:\n")

    if mr_line
      markdown(format(SUGGEST_MR_COMMENT, group: mr_group_label), file: feature_flag.path, line: mr_line.succ)
    else
      warn %(Consider setting `group: "#{mr_group_label}"` in #{gitlab.html_link(feature_flag.path)}. #{SEE_DOC})
    end
  end
end

def message_for_feature_flag_with_group!(feature_flag:, mr_group_label:)
  return if feature_flag.group_match_mr_label?(mr_group_label)

  if mr_group_label.nil?
    gitlab.api.update_merge_request(gitlab.mr_json['project_id'],
                                    gitlab.mr_json['iid'],
                                    add_labels: feature_flag.group)
  else
    fail %(`group` is set to ~"#{feature_flag.group}" in #{gitlab.html_link(feature_flag.path)}, which does not match ~"#{mr_group_label}" set on the MR!)
  end
end

feature_flag.feature_flag_files.each do |feature_flag|
  check_feature_flag_yaml(feature_flag)
end