// Copyright 2015 The Chromium 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 "device/usb/usb_device.h"

#include "base/guid.h"
#include "device/usb/usb_device_handle.h"
#include "device/usb/webusb_descriptors.h"

namespace device {

UsbDevice::Observer::~Observer() = default;

void UsbDevice::Observer::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {}

UsbDevice::UsbDevice() : guid_(base::GenerateGUID()) {}

UsbDevice::UsbDevice(const UsbDeviceDescriptor& descriptor,
                     const base::string16& manufacturer_string,
                     const base::string16& product_string,
                     const base::string16& serial_number)
    : descriptor_(descriptor),
      manufacturer_string_(manufacturer_string),
      product_string_(product_string),
      serial_number_(serial_number),
      guid_(base::GenerateGUID()) {}

UsbDevice::UsbDevice(uint16_t usb_version,
                     uint8_t device_class,
                     uint8_t device_subclass,
                     uint8_t device_protocol,
                     uint16_t vendor_id,
                     uint16_t product_id,
                     uint16_t device_version,
                     const base::string16& manufacturer_string,
                     const base::string16& product_string,
                     const base::string16& serial_number)
    : manufacturer_string_(manufacturer_string),
      product_string_(product_string),
      serial_number_(serial_number),
      guid_(base::GenerateGUID()) {
  descriptor_.usb_version = usb_version;
  descriptor_.device_class = device_class;
  descriptor_.device_subclass = device_subclass;
  descriptor_.device_protocol = device_protocol;
  descriptor_.vendor_id = vendor_id;
  descriptor_.product_id = product_id;
  descriptor_.device_version = device_version;
}

UsbDevice::~UsbDevice() = default;

void UsbDevice::CheckUsbAccess(ResultCallback callback) {
  // By default assume that access to the device is allowed. This is implemented
  // on Chrome OS by checking with permission_broker.
  std::move(callback).Run(true);
}

void UsbDevice::RequestPermission(ResultCallback callback) {
  // By default assume that access to the device is allowed. This is implemented
  // on Android by calling android.hardware.usb.UsbManger.requestPermission.
  std::move(callback).Run(true);
}

bool UsbDevice::permission_granted() const {
  return true;
}

void UsbDevice::AddObserver(Observer* observer) {
  observer_list_.AddObserver(observer);
}

void UsbDevice::RemoveObserver(Observer* observer) {
  observer_list_.RemoveObserver(observer);
}

void UsbDevice::ActiveConfigurationChanged(int configuration_value) {
  for (const auto& config : configurations()) {
    if (config.configuration_value == configuration_value) {
      active_configuration_ = &config;
      return;
    }
  }
}

void UsbDevice::NotifyDeviceRemoved() {
  for (auto& observer : observer_list_)
    observer.OnDeviceRemoved(this);
}

void UsbDevice::OnDisconnect() {
  // Swap out the handle list as HandleClosed() will try to modify it.
  std::list<UsbDeviceHandle*> handles;
  handles.swap(handles_);
  for (auto* handle : handles_)
    handle->Close();
}

void UsbDevice::HandleClosed(UsbDeviceHandle* handle) {
  handles_.remove(handle);
}

}  // namespace device