// 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 "mash/wm/window_manager_impl.h"

#include "components/mus/common/types.h"
#include "components/mus/public/cpp/property_type_converters.h"
#include "components/mus/public/cpp/window.h"
#include "components/mus/public/cpp/window_property.h"
#include "components/mus/public/cpp/window_tree_connection.h"
#include "components/mus/public/interfaces/input_events.mojom.h"
#include "mash/wm/non_client_frame_controller.h"
#include "mash/wm/property_util.h"
#include "mash/wm/public/interfaces/container.mojom.h"
#include "mash/wm/window_manager_application.h"
#include "mojo/application/public/cpp/application_impl.h"
#include "mojo/converters/geometry/geometry_type_converters.h"

namespace mojo {

template <>
struct TypeConverter<const std::vector<uint8_t>, Array<uint8_t>> {
  static const std::vector<uint8_t> Convert(const Array<uint8_t>& input) {
    return input.storage();
  }
};

}  // namespace mojo

namespace mash {
namespace wm {

WindowManagerImpl::WindowManagerImpl(WindowManagerApplication* state)
    : state_(state) {}

WindowManagerImpl::~WindowManagerImpl() {
  mus::Window* parent =
      state_->GetWindowForContainer(mojom::CONTAINER_USER_WINDOWS);
  if (!parent)
    return;

  for (mus::Window* child : parent->children())
    child->RemoveObserver(this);
}

gfx::Rect WindowManagerImpl::CalculateDefaultBounds(mus::Window* window) const {
  int width, height;
  const gfx::Size pref = GetWindowPreferredSize(window);
  const mus::Window* root = state_->root();
  if (pref.IsEmpty()) {
    width = root->bounds().width() - 240;
    height = root->bounds().height() - 240;
  } else {
    // TODO(sky): likely want to constrain more than root size.
    const gfx::Size max_size = GetMaximizedWindowBounds().size();
    width = std::max(0, std::min(max_size.width(), pref.width()));
    height = std::max(0, std::min(max_size.height(), pref.height()));
  }
  return gfx::Rect(40 + (state_->window_count() % 4) * 40,
                   40 + (state_->window_count() % 4) * 40, width, height);
}

gfx::Rect WindowManagerImpl::GetMaximizedWindowBounds() const {
  return gfx::Rect(state_->root()->bounds().size());
}

void WindowManagerImpl::OpenWindow(
    mus::mojom::WindowTreeClientPtr client,
    mojo::Map<mojo::String, mojo::Array<uint8_t>> transport_properties) {
  mus::Window* root = state_->root();
  DCHECK(root);

  mus::Window::SharedProperties properties =
      transport_properties.To<mus::Window::SharedProperties>();
  // TODO(sky): constrain to valid properties here.
  mus::Window* child_window = root->connection()->NewWindow(&properties);
  child_window->SetBounds(CalculateDefaultBounds(child_window));
  GetContainerForChild(child_window)->AddChild(child_window);
  child_window->Embed(client.Pass());

  // NonClientFrameController deletes itself when |child_window| is destroyed.
  new NonClientFrameController(state_->app()->shell(), child_window,
                               state_->window_tree_host());

  state_->IncrementWindowCount();
}

void WindowManagerImpl::GetConfig(const GetConfigCallback& callback) {
  mus::mojom::WindowManagerConfigPtr config(
      mus::mojom::WindowManagerConfig::New());
  config->displays = mojo::Array<mus::mojom::DisplayPtr>::New(1);
  config->displays[0] = mus::mojom::Display::New();
  config->displays[0]->id = 2001;
  config->displays[0]->bounds = mojo::Rect::New();
  config->displays[0]->bounds->y = 0;
  config->displays[0]->bounds->width = state_->root()->bounds().width();
  config->displays[0]->bounds->height = state_->root()->bounds().width();
  config->displays[0]->work_area = config->displays[0]->bounds.Clone();
  config->displays[0]->device_pixel_ratio =
      state_->root()->viewport_metrics().device_pixel_ratio;

  // The insets are roughly what is needed by CustomFrameView. The expectation
  // is at some point we'll write our own NonClientFrameView and get the insets
  // from it.
  const gfx::Insets client_area_insets =
      NonClientFrameController::GetPreferredClientAreaInsets();
  config->normal_client_area_insets = mojo::Insets::From(client_area_insets);

  config->maximized_client_area_insets = mojo::Insets::From(client_area_insets);

  callback.Run(config.Pass());
}

bool WindowManagerImpl::OnWmSetBounds(mus::Window* window, gfx::Rect* bounds) {
  // By returning true the bounds of |window| is updated.
  return true;
}

bool WindowManagerImpl::OnWmSetProperty(
    mus::Window* window,
    const std::string& name,
    scoped_ptr<std::vector<uint8_t>>* new_data) {
  // TODO(sky): constrain this to set of keys we know about, and allowed
  // values.
  return name == mus::mojom::WindowManager::kShowState_Property ||
         name == mus::mojom::WindowManager::kPreferredSize_Property ||
         name == mus::mojom::WindowManager::kResizeBehavior_Property;
}

mus::Window* WindowManagerImpl::GetContainerForChild(mus::Window* child) {
  mojom::Container container = GetRequestedContainer(child);
  return state_->GetWindowForContainer(container);
}

}  // namespace wm
}  // namespace mash