class Airbrake::Filters::GitLastCheckoutFilter

def call(notice)
  return if notice[:context].key?(:lastCheckout)
  if @last_checkout
    notice[:context][:lastCheckout] = @last_checkout
    return
  end
  return unless File.exist?(@git_path)
  return unless (checkout = last_checkout)
  notice[:context][:lastCheckout] = checkout
end

def checkout_line?(line)
  line.include?("\tclone:") ||
    line.include?("\tpull:") ||
    line.include?("\tcheckout:")
end

def initialize(root_directory)
  @git_path = File.join(root_directory, '.git')
  @weight = 116
  @last_checkout = nil
  @deploy_username = ENV.fetch('AIRBRAKE_DEPLOY_USERNAME', nil)
end

def last_checkout
  return unless (line = last_checkout_line)
  parts = line.chomp.split("\t").first.split
  if parts.size < MIN_HEAD_COLS
    logger.error(
      "#{LOG_LABEL} Airbrake::#{self.class.name}: can't parse line: #{line}",
    )
    return
  end
  author = parts[2..-4]
  @last_checkout = {
    username: @deploy_username || author[0..1].join(' '),
    email: parts[-3][1..-2],
    revision: parts[1],
    time: timestamp(parts[-2].to_i),
  }
end

def last_checkout_line
  head_path = File.join(@git_path, 'logs', 'HEAD')
  return unless File.exist?(head_path)
  last_line = nil
  File.foreach(head_path) do |line|
    last_line = line if checkout_line?(line)
  end
  last_line
end

def timestamp(utime)
  Time.at(utime).to_datetime.rfc3339
end