port module FileSharing.FilesList.Port exposing (..)

{-| Copyright 2020 Fluence Labs Limited

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-}

import FileSharing.FilesList.Model exposing (Model, Status(..))
import FileSharing.FilesList.Msg exposing (Msg(..))
import Maybe exposing (andThen)


type alias Command =
    { command : String, hash : Maybe String }


type alias Event =
    { event : String, hash : Maybe String, log : Maybe String, preview : Maybe String }


port fileRequest : Command -> Cmd msg


port fileReceiver : (Event -> msg) -> Sub msg


eventToMsg : Event -> Msg
eventToMsg event =
    Maybe.withDefault NoOp <|
        case event.event of
            "uploading" ->
                Maybe.map FileUploading event.hash

            "uploaded" ->
                Maybe.map FileUploaded event.hash

            "downloading" ->
                Maybe.map FileDownloading event.hash

            "advertised" ->
                Maybe.map (\m -> m event.preview) (Maybe.map FileAdvertised event.hash)

            "copied" ->
                Maybe.map Copied event.hash

            "requested" ->
                Maybe.map FileRequested event.hash

            "reset_entries" ->
                Just <| ResetEntries

            "loaded" ->
                Maybe.map (\m -> m event.preview) (Maybe.map FileLoaded event.hash)

            "asked" ->
                Maybe.map FileAsked event.hash

            "log" ->
                event.hash
                    |> andThen
                        (\h ->
                            event.log
                                |> andThen (\l -> Just (FileLog h l))
                        )

            _ ->
                Nothing


subscriptions : Model -> Sub Msg
subscriptions _ =
    fileReceiver eventToMsg