class ActionDispatch::DebugExceptions

def self.register_interceptor(object = nil, &block)
  interceptor = object || block
  interceptors << interceptor
end

def api_request?(content_type)
  @response_format == :api && !content_type.html?
end

def call(env)
  _, headers, body = response = @app.call(env)
  if headers[Constants::X_CASCADE] == "pass"
    body.close if body.respond_to?(:close)
    raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
  end
  response
rescue Exception => exception
  request = ActionDispatch::Request.new env
  backtrace_cleaner = request.get_header("action_dispatch.backtrace_cleaner")
  wrapper = ExceptionWrapper.new(backtrace_cleaner, exception)
  invoke_interceptors(request, exception, wrapper)
  raise exception unless wrapper.show?(request)
  render_exception(request, exception, wrapper)
end

def create_template(request, wrapper)
  DebugView.new(
    request: request,
    exception_wrapper: wrapper,
    # Everything should use the wrapper, but we need to pass
    # `exception` for legacy code.
    exception: wrapper.exception,
    traces: wrapper.traces,
    show_source_idx: wrapper.source_to_show_id,
    trace_to_show: wrapper.trace_to_show,
    routes_inspector: routes_inspector(wrapper),
    source_extracts: wrapper.source_extracts,
  )
end

def initialize(app, routes_app = nil, response_format = :default, interceptors = self.class.interceptors)
  @app             = app
  @routes_app      = routes_app
  @response_format = response_format
  @interceptors    = interceptors
end

def invoke_interceptors(request, exception, wrapper)
  @interceptors.each do |interceptor|
    interceptor.call(request, exception)
  rescue Exception
    log_error(request, wrapper)
  end
end

def log_array(logger, lines, request)
  return if lines.empty?
  level = request.get_header("action_dispatch.debug_exception_log_level")
  if logger.formatter && logger.formatter.respond_to?(:tags_text)
    logger.add(level, lines.join("\n#{logger.formatter.tags_text}"))
  else
    logger.add(level, lines.join("\n"))
  end
end

def log_error(request, wrapper)
  logger = logger(request)
  return unless logger
  return if !log_rescued_responses?(request) && wrapper.rescue_response?
  trace = wrapper.exception_trace
  message = []
  message << "  "
  message << "#{wrapper.exception_class_name} (#{wrapper.message}):"
  message.concat(wrapper.annotated_source_code)
  message << "  "
  message.concat(trace)
  log_array(logger, message, request)
end

def log_rescued_responses?(request)
  request.get_header("action_dispatch.log_rescued_responses")
end

def logger(request)
  request.logger || ActionView::Base.logger || stderr_logger
end

def render(status, body, format)
  [status, { Rack::CONTENT_TYPE => "#{format}; charset=#{Response.default_charset}", Rack::CONTENT_LENGTH => body.bytesize.to_s }, [body]]
end

def render_exception(request, exception, wrapper)
  log_error(request, wrapper)
  if request.get_header("action_dispatch.show_detailed_exceptions")
    begin
      content_type = request.formats.first
    rescue ActionDispatch::Http::MimeNegotiation::InvalidType
      content_type = Mime[:text]
    end
    if api_request?(content_type)
      render_for_api_request(content_type, wrapper)
    else
      render_for_browser_request(request, wrapper)
    end
  else
    raise exception
  end
end

def render_for_api_request(content_type, wrapper)
  body = {
    status: wrapper.status_code,
    error:  Rack::Utils::HTTP_STATUS_CODES.fetch(
      wrapper.status_code,
      Rack::Utils::HTTP_STATUS_CODES[500]
    ),
    exception: wrapper.exception_inspect,
    traces: wrapper.traces
  }
  to_format = "to_#{content_type.to_sym}"
  if content_type && body.respond_to?(to_format)
    formatted_body = body.public_send(to_format)
    format = content_type
  else
    formatted_body = body.to_json
    format = Mime[:json]
  end
  render(wrapper.status_code, formatted_body, format)
end

def render_for_browser_request(request, wrapper)
  template = create_template(request, wrapper)
  file = "rescues/#{wrapper.rescue_template}"
  if request.xhr?
    body = template.render(template: file, layout: false, formats: [:text])
    format = "text/plain"
  else
    body = template.render(template: file, layout: "rescues/layout")
    format = "text/html"
  end
  render(wrapper.status_code, body, format)
end

def routes_inspector(exception)
  if @routes_app.respond_to?(:routes) && (exception.routing_error? || exception.template_error?)
    ActionDispatch::Routing::RoutesInspector.new(@routes_app.routes.routes)
  end
end

def stderr_logger
  @stderr_logger ||= ActiveSupport::Logger.new($stderr)
end