// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "usb-handler.h"

namespace xdc {

// static
std::unique_ptr<UsbHandler::Transfer> UsbHandler::Transfer::Create() {
  auto transfer = std::make_unique<UsbHandler::Transfer>(ConstructorTag{});
  // TODO(jocelyndang): need to initialize the transfer.
  return transfer;
}

zx_status_t UsbHandler::Transfer::FillHeader(uint32_t stream_id, size_t data_len) {
  // TODO(jocelyndang): implement this.
  return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t UsbHandler::Transfer::FillData(uint32_t stream_id, unsigned char* data,
                                           size_t data_len) {
  // TODO(jocelyndang): implement this.
  return ZX_ERR_NOT_SUPPORTED;
}

bool UsbHandler::Transfer::SetOffset(int offset) {
  if (offset < 0 || offset > actual_length_) {
    return false;
  }
  offset_ = offset;
  return true;
}

// static
std::unique_ptr<UsbHandler> UsbHandler::Create() {
  auto usb_handler = std::make_unique<UsbHandler>(ConstructorTag{});
  if (!usb_handler) {
    return nullptr;
  }
  // TODO(jocelyndang): need to initialize initial libusb fds.
  return usb_handler;
}

bool UsbHandler::HandleEvents(std::vector<std::unique_ptr<Transfer>>& completed_reads) {
  // TODO(jocelyndang): implement this.
  return false;
}

void UsbHandler::RequeueRead(std::unique_ptr<Transfer> transfer) {
  // TODO(jocelyndang): implement this.
}

void UsbHandler::GetFdUpdates(std::map<int, short>& added_fds, std::set<int>& removed_fds) {
  // TODO(jocelyndang): implement this.
}

std::unique_ptr<UsbHandler::Transfer> UsbHandler::GetWriteTransfer() {
  // TODO(jocelyndang): implement this.
  return nullptr;
}

void UsbHandler::ReturnWriteTransfer(std::unique_ptr<Transfer>) {
  // TODO(jocelyndang): implement this.
}

std::unique_ptr<UsbHandler::Transfer> UsbHandler::QueueWriteTransfer(
    std::unique_ptr<Transfer> transfer) {
  // TODO(jocelyndang): implement this.
  return transfer;
}

}  // namespace xdc