// Copyright 2022 The Pigweed Authors
//
// 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
//
//     https://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.
#pragma once

#include "pw_assert/assert.h"
#include "pw_containers/intrusive_list.h"
#include "pw_result/result.h"
#include "pw_rpc/raw/server_reader_writer.h"
#include "pw_transfer/handler.h"
#include "pw_transfer/internal/context.h"

namespace pw::transfer::internal {

// Transfer context for use within the transfer service (server-side). Stores a
// pointer to a transfer handler when active to stream the transfer data.
class ServerContext final : public Context {
 public:
  constexpr ServerContext() : handler_(nullptr) {}

  // Sets the handler. The handler isn't set by Context::Initialize() since
  // ClientContexts don't track it.
  void set_handler(Handler& handler) { handler_ = &handler; }

  // Returns the pointer to the current handler.
  const Handler* handler() { return handler_; }

  // In server-side transfer contexts, a session ID always exists.
  constexpr uint32_t id() const { return session_id(); }

 private:
  // Ends the transfer with the given status, calling the handler's Finalize
  // method. No chunks are sent.
  //
  // Returns DATA_LOSS if the finalize call fails.
  //
  // Precondition: Transfer context is active.
  Status FinalCleanup(Status status) override;

  Handler* handler_;
};

}  // namespace pw::transfer::internal