// Copyright 2014 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 "ui/events/ozone/evdev/mouse_button_map_evdev.h"

#include <linux/input.h>

#include "base/logging.h"

namespace ui {

namespace {

// Defines the range of button codes that we support.
//
// Check linux/input.h for more info.
const MouseButtonMapEvdev::Button kMinMouseButtonCode = BTN_MISC;
const MouseButtonMapEvdev::Button kMaxMouseButtonCode = BTN_GEAR_UP;

bool IsMouseButton(const MouseButtonMapEvdev::Button button) {
  return (button >= kMinMouseButtonCode && button <= kMaxMouseButtonCode);
}

}  // namespace

MouseButtonMapEvdev::MouseButtonMapEvdev() {
  ResetButtonMap();
}

MouseButtonMapEvdev::~MouseButtonMapEvdev() {
}

void MouseButtonMapEvdev::UpdateButtonMap(Button button_from,
                                          Button button_to) {
  DCHECK(IsMouseButton(button_from) && IsMouseButton(button_to));
  button_map_[button_from] = button_to;
}

void MouseButtonMapEvdev::ResetButtonMap() {
  button_map_.clear();
  for (Button i = kMinMouseButtonCode; i <= kMaxMouseButtonCode; ++i)
    button_map_[i] = i;
}

int MouseButtonMapEvdev::GetMappedButton(const Button button) const {
  ButtonMap::const_iterator it = button_map_.find(button);
  DCHECK(it != button_map_.end());
  return it->second;
}

}  // namespace ui