class Bundler::Worker

def abort_threads
  Bundler.ui.debug("\n#{caller.join("\n")}")
  @threads.each(&:exit)
  exit 1
end

def add_interrupt_handler
  @previous_interrupt_handler = trap("INT") { abort_threads }
end

def apply_func(obj, i)
  @func.call(obj, i)
rescue Exception => e # rubocop:disable Lint/RescueException
  WrappedException.new(e)
end

def create_threads
  creation_errors = []
  @threads = Array.new(@size) do |i|
    begin
      Thread.start { process_queue(i) }.tap do |thread|
        thread.name = "#{name} Worker ##{i}" if thread.respond_to?(:name=)
      end
    rescue ThreadError => e
      creation_errors << e
      nil
    end
  end.compact
  add_interrupt_handler unless @threads.empty?
  return if creation_errors.empty?
  message = "Failed to create threads for the #{name} worker: #{creation_errors.map(&:to_s).uniq.join(", ")}"
  raise ThreadCreationError, message if @threads.empty?
  Bundler.ui.info message
end

def deq
  result = @response_queue.deq
  raise result.exception if result.is_a?(WrappedException)
  result
end

def enq(obj)
  create_threads unless @threads
  @request_queue.enq obj
end

def initialize(size, name, func)
  @name = name
  @request_queue = Thread::Queue.new
  @response_queue = Thread::Queue.new
  @func = func
  @size = size
  @threads = nil
  @previous_interrupt_handler = nil
end

def process_queue(i)
  loop do
    obj = @request_queue.deq
    break if obj.equal? POISON
    @response_queue.enq apply_func(obj, i)
  end
end

def remove_interrupt_handler
  return unless @previous_interrupt_handler
  trap "INT", @previous_interrupt_handler
end

def stop
  stop_threads
end

def stop_threads
  return unless @threads
  @threads.each { @request_queue.enq POISON }
  @threads.each(&:join)
  remove_interrupt_handler
  @threads = nil
end