text: // Copyright (c) 2013 GitHub, Inc.
  // Use of this source code is governed by the MIT license that can be
  // found in the LICENSE file.
  
  #include "atom/browser/api/atom_api_power_monitor.h"
  
  #include "atom/browser/browser.h"
  #include "atom/common/native_mate_converters/callback.h"
  #include "base/power_monitor/power_monitor.h"
  #include "base/power_monitor/power_monitor_device_source.h"
  #include "native_mate/dictionary.h"
  
  #include "atom/common/node_includes.h"
  
  namespace mate {
  template <>
  struct Converter<ui::IdleState> {
    static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
                                     const ui::IdleState& in) {
      switch (in) {
        case ui::IDLE_STATE_ACTIVE:
          return mate::StringToV8(isolate, "active");
        case ui::IDLE_STATE_IDLE:
          return mate::StringToV8(isolate, "idle");
        case ui::IDLE_STATE_LOCKED:
          return mate::StringToV8(isolate, "locked");
        case ui::IDLE_STATE_UNKNOWN:
        default:
          return mate::StringToV8(isolate, "unknown");
      }
    }
  };
  }  // namespace mate
  
  namespace atom {
  
  namespace api {
  
  PowerMonitor::PowerMonitor(v8::Isolate* isolate) {
  #if defined(OS_LINUX)
    SetShutdownHandler(
        base::Bind(&PowerMonitor::ShouldShutdown, base::Unretained(this)));
  #elif defined(OS_MACOSX)
    Browser::Get()->SetShutdownHandler(
        base::Bind(&PowerMonitor::ShouldShutdown, base::Unretained(this)));
  #endif
    base::PowerMonitor::Get()->AddObserver(this);
    Init(isolate);
  #if defined(OS_MACOSX) || defined(OS_WIN)
    InitPlatformSpecificMonitors();
  #endif
  }
  
  PowerMonitor::~PowerMonitor() {
    base::PowerMonitor::Get()->RemoveObserver(this);
  }
  
  bool PowerMonitor::ShouldShutdown() {
    return !Emit("shutdown");
  }
  
  #if defined(OS_LINUX)
  void PowerMonitor::BlockShutdown() {
    PowerObserverLinux::BlockShutdown();
  }
  
  void PowerMonitor::UnblockShutdown() {
    PowerObserverLinux::UnblockShutdown();
  }
  #endif
  
  void PowerMonitor::OnPowerStateChange(bool on_battery_power) {
    if (on_battery_power)
      Emit("on-battery");
    else
      Emit("on-ac");
  }
  
  void PowerMonitor::OnSuspend() {
    Emit("suspend");
  }
  
  void PowerMonitor::OnResume() {
    Emit("resume");
  }
  
  ui::IdleState PowerMonitor::GetSystemIdleState(v8::Isolate* isolate,
                                                 int idle_threshold) {
    if (idle_threshold > 0) {
      return ui::CalculateIdleState(idle_threshold);
    } else {
      isolate->ThrowException(v8::Exception::TypeError(mate::StringToV8(
          isolate, "Invalid idle threshold, must be greater than 0")));
      return ui::IDLE_STATE_UNKNOWN;
    }
  }
  
  int PowerMonitor::GetSystemIdleTime() {
    return ui::CalculateIdleTime();
  }
  
  // static
  v8::Local<v8::Value> PowerMonitor::Create(v8::Isolate* isolate) {
    if (!Browser::Get()->is_ready()) {
      isolate->ThrowException(v8::Exception::Error(mate::StringToV8(
          isolate,
          "Cannot require \"powerMonitor\" module before app is ready")));
      return v8::Null(isolate);
    }
  
    return mate::CreateHandle(isolate, new PowerMonitor(isolate)).ToV8();
  }
  
  // static
  void PowerMonitor::BuildPrototype(v8::Isolate* isolate,
                                    v8::Local<v8::FunctionTemplate> prototype) {
    prototype->SetClassName(mate::StringToV8(isolate, "PowerMonitor"));
  
    mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
        .MakeDestroyable()
  #if defined(OS_LINUX)
        .SetMethod("blockShutdown", &PowerMonitor::BlockShutdown)
        .SetMethod("unblockShutdown", &PowerMonitor::UnblockShutdown)
  #endif
        .SetMethod("getSystemIdleState", &PowerMonitor::GetSystemIdleState)
        .SetMethod("getSystemIdleTime", &PowerMonitor::GetSystemIdleTime);
  }
  
  }  // namespace api
  
  }  // namespace atom
  
  namespace {
  
  using atom::api::PowerMonitor;
  
  void Initialize(v8::Local<v8::Object> exports,
                  v8::Local<v8::Value> unused,
                  v8::Local<v8::Context> context,
                  void* priv) {
    v8::Isolate* isolate = context->GetIsolate();
    mate::Dictionary dict(isolate, exports);
    dict.Set("powerMonitor", PowerMonitor::Create(isolate));
    dict.Set("PowerMonitor", PowerMonitor::GetConstructor(isolate)
                                 ->GetFunction(context)
                                 .ToLocalChecked());
  }
  
  }  // namespace
  
  NODE_LINKED_MODULE_CONTEXT_AWARE(atom_browser_power_monitor, Initialize)
  