module W3DHubLauncher
  class Worker
    Response = Data.define(:status, :request_id, :data)

    def initialize
    end

    def connect
      puts :connect

      @socket = UNIXSocket.new(IPC_PATH)
    end

    def connected?
      @socket && !@socket.closed?
    end

    def listen
      init_server
    end

    def init_server
      @threads = []
      @requests = []

      @settings = 0# Settings.new

      # connect to and monitor GSH web service
      @threads << Thread.new { game_server_hub_websocket }
      # connect to and monitor Backend web service
      @threads << Thread.new { backend_websocket }

      @w3dhub_api = W3DHubLauncher::W3DHubApi.new

      Async do |task|
        UNIXServer.open(IPC_PATH) do |server|
          while(socket = server.accept)
            task.async do
              data = socket.gets
              json = JSON.parse(data)
              query = Request::Query.new(type: json["type"].to_sym, request_id: json["request_id"], data: json["data"])

              pp [:server_incoming, data, query]

              if respond_to?(query.type)
                response = send(query.type, query)
                pp [:server_to_client, response]
                payload = { status: response.status, request_id: response.request_id, data: response.data.data }.to_json
                socket.puts(payload)
              end
            end
          end
        ensure # manually delete "socket"
          File.delete(IPC_PATH)
        end
      end
    end

    def game_server_hub_websocket
    end

    def backend_websocket
    end

    # Send request to server
    def request(query)
      pp [:client_request, query]
      payload = { type: query.type, request_id: query.request_id, data: query.data }.to_json

      if respond_to?(query.type)
        @socket.puts(payload)
      else
        raise "UNKNOWN REQUEST: #{query}"
      end
    end

    def service
      data = @socket.read_nonblock(1_048_576) # 1 MB
      pp [:CLIENT, data]
      json = JSON.parse(data)
      response = Response.new(status: json["status"], request_id: json["request_id"], data: json["data"])
      request = W3DHubLauncher::Worker::Request.requests.find { |r| r.request_id == response.request_id }

      pp [json, response, request]
      return unless request

      CyberarmEngine::Window.instance&.add_to_queue(proc {
        request.handle_event(
          response.status,
          CyberarmEngine::Result.new(data: response.data, error: response.status.negative? ? true : nil)
        )
      })

    rescue Errno::EWOULDBLOCK
    end

    def deliver_response(result, query)
      response = Response.new(result.okay? ? Request::STATUS_COMPLETE : Request::STATUS_ERROR, query.request_id, result)
      pp response

      response
    end

    #
    # ------------ query / request handlers ------------
    #
    def fetch_url(query)
    end

    def download_url(query)
    end

    def w3dhub_api_call(query)
      result = @w3dhub_api.send(query.data["call"], *(query.data["arguments"] || []))

      deliver_response(result, query)
    end

    def update_settings(query)
      result = CyberarmEngine::Result.new

      FileUtils.mkdir_p(W3DHubLauncher::CONFIG_PATH) # FIXME: FAILABLE!
      File.write("#{W3DHubLauncher::CONFIG_PATH}/settings.json", query.data) # FIXME: FAILABLE!
      result.data = query.data
      deliver_response(result, query)
    end

    def install_application(query)
    end

    def update_application(query)
    end

    def repair_application(query)
    end

    def move_application(query)
    end

    def uninstall_application(query)
    end
  end
end