// Copyright (c) 2014 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/event_emitter.h"

#include "atom/browser/api/event.h"
#include "native_mate/arguments.h"
#include "native_mate/dictionary.h"
#include "native_mate/object_template_builder.h"
#include "ui/events/event_constants.h"

#include "atom/common/node_includes.h"

namespace mate {

namespace {

// The prototype of Node's EventEmitter.
v8::Persistent<v8::Object> g_event_emitter_prototype;

v8::Persistent<v8::ObjectTemplate> event_template;

void PreventDefault(mate::Arguments* args) {
  mate::Dictionary self(args->isolate(), args->GetThis());
  self.Set("defaultPrevented", true);
}

// Create a pure JavaScript Event object.
v8::Local<v8::Object> CreateEventObject(v8::Isolate* isolate) {
  if (event_template.IsEmpty()) {
    event_template.Reset(isolate, ObjectTemplateBuilder(isolate)
        .SetMethod("preventDefault", &PreventDefault)
        .Build());
  }

  return v8::Local<v8::ObjectTemplate>::New(
      isolate, event_template)->NewInstance();
}

}  // namespace

namespace internal {

v8::Local<v8::Object> CreateJSEvent(
    v8::Isolate* isolate,
    v8::Local<v8::Object> object,
    content::WebContents* sender,
    IPC::Message* message) {
  v8::Local<v8::Object> event;
  bool use_native_event = sender && message;

  if (use_native_event) {
    mate::Handle<mate::Event> native_event = mate::Event::Create(isolate);
    native_event->SetSenderAndMessage(sender, message);
    event = v8::Local<v8::Object>::Cast(native_event.ToV8());
  } else {
    event = CreateEventObject(isolate);
  }
  mate::Dictionary(isolate, event).Set("sender", object);
  return event;
}

v8::Local<v8::Object> CreateCustomEvent(
    v8::Isolate* isolate,
    v8::Local<v8::Object> object,
    v8::Local<v8::Object> custom_event) {
  v8::Local<v8::Object> event = CreateEventObject(isolate);
  (void)event->SetPrototype(custom_event->CreationContext(), custom_event);
  mate::Dictionary(isolate, event).Set("sender", object);
  return event;
}

v8::Local<v8::Object> CreateEventFromFlags(v8::Isolate* isolate, int flags) {
  mate::Dictionary obj = mate::Dictionary::CreateEmpty(isolate);
  obj.Set("shiftKey", static_cast<bool>(flags & ui::EF_SHIFT_DOWN));
  obj.Set("ctrlKey", static_cast<bool>(flags & ui::EF_CONTROL_DOWN));
  obj.Set("altKey", static_cast<bool>(flags & ui::EF_ALT_DOWN));
  obj.Set("metaKey", static_cast<bool>(flags & ui::EF_COMMAND_DOWN));
  return obj.GetHandle();
}

void InheritFromEventEmitter(v8::Isolate* isolate,
                             v8::Local<v8::FunctionTemplate> constructor) {
}

void SetEventEmitterPrototype(v8::Isolate* isolate,
                              v8::Local<v8::Object> prototype) {
  g_event_emitter_prototype.Reset(isolate, prototype);
}

}  // namespace internal

}  // namespace mate


namespace {

void Initialize(v8::Local<v8::Object> exports, v8::Local<v8::Value> unused,
                v8::Local<v8::Context> context, void* priv) {
  mate::Dictionary(context->GetIsolate(), exports)
      .SetMethod("setEventEmitterPrototype",
                 &mate::internal::SetEventEmitterPrototype);
}

}  // namespace

NODE_MODULE_CONTEXT_AWARE_BUILTIN(atom_browser_event_emitter, Initialize)