// Copyright (c) 2013 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 "mojo/aura/window_tree_host_mojo.h"

#include "mojo/aura/context_factory_mojo.h"
#include "mojo/public/c/gles2/gles2.h"
#include "mojo/public/cpp/bindings/allocation_scope.h"
#include "mojo/services/native_viewport/geometry_conversions.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/compositor/compositor.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/rect.h"

namespace mojo {

// static
mojo::ContextFactoryMojo* WindowTreeHostMojo::context_factory_ = NULL;

////////////////////////////////////////////////////////////////////////////////
// WindowTreeHostMojo, public:

WindowTreeHostMojo::WindowTreeHostMojo(
    ScopedNativeViewportHandle viewport_handle,
    const gfx::Rect& bounds,
    const base::Callback<void()>& compositor_created_callback)
    : native_viewport_(viewport_handle.Pass(), this),
      compositor_created_callback_(compositor_created_callback),
      bounds_(bounds) {
  AllocationScope scope;
  native_viewport_->Create(bounds);

  ScopedMessagePipeHandle gles2_handle, gles2_client_handle;
  CreateMessagePipe(&gles2_handle, &gles2_client_handle);

  // The ContextFactory must exist before any Compositors are created.
  if (context_factory_) {
    ui::ContextFactory::SetInstance(NULL);
    delete context_factory_;
    context_factory_ = NULL;
  }
  context_factory_ = new ContextFactoryMojo(gles2_handle.Pass());
  ui::ContextFactory::SetInstance(context_factory_);
  CHECK(context_factory_) << "No GL bindings.";

  native_viewport_->CreateGLES2Context(gles2_client_handle.Pass());
}

WindowTreeHostMojo::~WindowTreeHostMojo() {
  DestroyCompositor();
  DestroyDispatcher();
}

////////////////////////////////////////////////////////////////////////////////
// WindowTreeHostMojo, aura::WindowTreeHost implementation:

ui::EventSource* WindowTreeHostMojo::GetEventSource() {
  return this;
}

gfx::AcceleratedWidget WindowTreeHostMojo::GetAcceleratedWidget() {
  NOTIMPLEMENTED() << "GetAcceleratedWidget";
  return gfx::kNullAcceleratedWidget;
}

void WindowTreeHostMojo::Show() {
  window()->Show();
  native_viewport_->Show();
}

void WindowTreeHostMojo::Hide() {
  native_viewport_->Hide();
  window()->Hide();
}

gfx::Rect WindowTreeHostMojo::GetBounds() const {
  return bounds_;
}

void WindowTreeHostMojo::SetBounds(const gfx::Rect& bounds) {
  AllocationScope scope;
  native_viewport_->SetBounds(bounds);
}

gfx::Point WindowTreeHostMojo::GetLocationOnNativeScreen() const {
  return gfx::Point(0, 0);
}

void WindowTreeHostMojo::SetCapture() {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::ReleaseCapture() {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::PostNativeEvent(
    const base::NativeEvent& native_event) {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::OnDeviceScaleFactorChanged(float device_scale_factor) {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::SetCursorNative(gfx::NativeCursor cursor) {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::MoveCursorToNative(const gfx::Point& location) {
  NOTIMPLEMENTED();
}

void WindowTreeHostMojo::OnCursorVisibilityChangedNative(bool show) {
  NOTIMPLEMENTED();
}

////////////////////////////////////////////////////////////////////////////////
// WindowTreeHostMojo, ui::EventSource implementation:

ui::EventProcessor* WindowTreeHostMojo::GetEventProcessor() {
  return dispatcher();
}

////////////////////////////////////////////////////////////////////////////////
// WindowTreeHostMojo, NativeViewportClient implementation:

void WindowTreeHostMojo::OnCreated() {
  CreateCompositor(GetAcceleratedWidget());
  compositor_created_callback_.Run();
}

void WindowTreeHostMojo::OnBoundsChanged(const Rect& bounds) {
  bounds_ = gfx::Rect(bounds.position().x(), bounds.position().y(),
                      bounds.size().width(), bounds.size().height());
  window()->SetBounds(gfx::Rect(bounds_.size()));
  OnHostResized(bounds_.size());
}

void WindowTreeHostMojo::OnDestroyed() {
  base::MessageLoop::current()->Quit();
}

void WindowTreeHostMojo::OnEvent(const Event& event,
                                 const mojo::Callback<void()>& callback) {
  switch (event.action()) {
    case ui::ET_MOUSE_PRESSED:
    case ui::ET_MOUSE_DRAGGED:
    case ui::ET_MOUSE_RELEASED:
    case ui::ET_MOUSE_MOVED:
    case ui::ET_MOUSE_ENTERED:
    case ui::ET_MOUSE_EXITED: {
      gfx::Point location(event.location().x(), event.location().y());
      ui::MouseEvent ev(static_cast<ui::EventType>(event.action()), location,
                        location, event.flags(), 0);
      SendEventToProcessor(&ev);
      break;
    }
    case ui::ET_KEY_PRESSED:
    case ui::ET_KEY_RELEASED: {
      ui::KeyEvent ev(
          static_cast<ui::EventType>(event.action()),
          static_cast<ui::KeyboardCode>(event.key_data().key_code()),
          event.flags(), event.key_data().is_char());
      SendEventToProcessor(&ev);
      break;
    }
    // TODO(beng): touch, etc.
  }
  callback.Run();
};

}  // namespace mojo