open Amqp_client_lwt

let handler pid { Message.message = (_content, body); _ } =
  Riot.send pid (Datatypes.ReceivedFromMq ("GOT RABBITs: "^body)) (*TODO: log*)

let handle_consumer_exn _exn =
  Lwt.return_unit (* TODO *)

let no_routing_key = `Queue ""

type rabbit_actor = {queue: Queue.t; channel: Channel.no_confirm Channel.t; connection: Connection.t}

let init riot_consumer =
  (* Init rabbitmq client *)
  let%lwt connection = Amqp.Connection.connect ~credentials:Datatypes.CREDS ~id:"Pam" MQURL in (*TODO: Creds*)
  let%lwt channel = Amqp.Connection.open_channel ~id:"Pam" Amqp.Channel.no_confirm connection in
  let%lwt exchange = Amqp.Exchange.declare channel Exchange.direct_t "pam" in
  (* let%lwt lanonna_exchange = Amqp.Exchange.declare channel Exchange.direct_t "lanonna" in *)
  let%lwt queue = Amqp.Queue.declare channel "pam" in
  let _ = Amqp.Queue.bind channel queue exchange no_routing_key in
  (* Amqp.Queue.publish channel queue (Amqp.Message.make "My Message Payload") >>= function `Ok -> *)
  let _ = print_endline "Initialized rabbitmq client" in

  (* Establish consumer *)
  let%lwt (_ampq_consumer, reader) = Amqp.Queue.consume ~no_ack:true ~id:"" channel queue in
  let _ = Thread.spawn ~exn_handler:handle_consumer_exn (Thread.Pipe.iter_without_pushback reader ~f:(handler riot_consumer)) in
  Lwt.return {queue=queue; channel=channel; connection=connection}

let shutdown {queue=_queue; channel; connection} =
  let ignore_exn = fun _ -> Lwt.return_unit in
  let%lwt _ = Lwt.catch (fun () -> Amqp.Channel.close channel) ignore_exn in
  let%lwt _ = Lwt.catch (fun () -> Amqp.Connection.close connection) ignore_exn in
  Lwt.return_unit

let mq_publish {queue=_; channel; connection=_} msg =
  let%lwt _ =
    Message.make msg
    |> Exchange.publish channel Exchange.default  ~routing_key:"lanonna"
  in Lwt.return_unit

let rec mq_publish_all mq = function
  | [] -> Lwt.return_unit
  | r::rest -> let%lwt _ = mq_publish mq r in mq_publish_all mq rest