// Copyright 2016 The Chromium Embedded Framework Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be found
// in the LICENSE file.

#ifndef CEF_LIBCEF_BROWSER_VIEWS_WINDOW_VIEW_H_
#define CEF_LIBCEF_BROWSER_VIEWS_WINDOW_VIEW_H_
#pragma once

#include <optional>
#include <vector>

#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "cef/include/views/cef_window.h"
#include "cef/include/views/cef_window_delegate.h"
#include "cef/libcef/browser/views/overlay_view_host.h"
#include "cef/libcef/browser/views/panel_view.h"
#include "cef/libcef/browser/views/widget_destruction_observer.h"
#include "third_party/skia/include/core/SkRegion.h"
#include "ui/display/display.h"
#include "ui/views/widget/widget_delegate.h"
#include "ui/views/widget/widget_observer.h"

// Manages the views-based root window. This object will be deleted
// automatically when the associated root window is destroyed.
class CefWindowView
    : public CefPanelView<views::WidgetDelegateView, CefWindowDelegate>,
      public views::WidgetObserver {
 public:
  using ParentClass =
      CefPanelView<views::WidgetDelegateView, CefWindowDelegate>;

  class Delegate {
   public:
    // Returns true to signal that the Widget can be closed.
    virtual bool CanWidgetClose() = 0;

    // Called when the underlying platform window is closing.
    virtual void OnWindowClosing() = 0;

    // Called when the WindowView is about to be deleted.
    virtual void OnWindowViewDeleted() = 0;

   protected:
    virtual ~Delegate() = default;
  };

  // |cef_delegate| may be nullptr.
  // |window_delegate| must be non-nullptr.
  CefWindowView(CefWindowDelegate* cef_delegate, Delegate* window_delegate);

  CefWindowView(const CefWindowView&) = delete;
  CefWindowView& operator=(const CefWindowView&) = delete;

  // Create the Widget.
  void CreateWidget(gfx::AcceleratedWidget parent_widget);

  // Returns the CefWindow associated with this view. See comments on
  // CefViewView::GetCefView.
  CefRefPtr<CefWindow> GetCefWindow() const;

  // views::WidgetDelegate methods:
  bool CanMinimize() const override;
  bool CanMaximize() const override;
  std::u16string GetWindowTitle() const override;
  ui::ImageModel GetWindowIcon() override;
  ui::ImageModel GetWindowAppIcon() override;
  void WindowClosing() override;
  views::View* GetContentsView() override;
  views::ClientView* CreateClientView(views::Widget* widget) override;
  std::unique_ptr<views::NonClientFrameView> CreateNonClientFrameView(
      views::Widget* widget) override;
  bool ShouldDescendIntoChildForEventHandling(
      gfx::NativeView child,
      const gfx::Point& location) override;
  bool MaybeGetMinimumSize(gfx::Size* size) const override;
  bool MaybeGetMaximumSize(gfx::Size* size) const override;

  // views::View methods:
  void ViewHierarchyChanged(
      const views::ViewHierarchyChangedDetails& details) override;
  void OnThemeChanged() override;

  // views::WidgetObserver methods:
  void OnWidgetActivationChanged(views::Widget* widget, bool active) override;
  void OnWidgetBoundsChanged(views::Widget* widget,
                             const gfx::Rect& new_bounds) override;

  // Returns the Display containing this Window.
  display::Display GetDisplay() const;

  // Set/get the window title.
  void SetTitle(const std::u16string& title);
  std::u16string title() const { return title_; }

  // Set/get the window icon. This should be a 16x16 icon suitable for use in
  // the Windows's title bar.
  void SetWindowIcon(CefRefPtr<CefImage> window_icon);
  CefRefPtr<CefImage> window_icon() const { return window_icon_; }

  // Set/get the window app icon. This should be a larger icon for use in the
  // host environment app switching UI. On Windows, this is the ICON_BIG used in
  // Alt-Tab list and Windows taskbar. The Window icon will be used by default
  // if no Window App icon is specified.
  void SetWindowAppIcon(CefRefPtr<CefImage> window_app_icon);
  CefRefPtr<CefImage> window_app_icon() const { return window_app_icon_; }

  CefRefPtr<CefOverlayController> AddOverlayView(
      CefRefPtr<CefView> view,
      cef_docking_mode_t docking_mode,
      bool can_activate);

  // Called from CefOverlayViewHost::Cleanup().
  void RemoveOverlayView(CefOverlayViewHost* host, views::View* host_view);

  // Set/get the draggable regions.
  void SetDraggableRegions(const std::vector<CefDraggableRegion>& regions);
  SkRegion* draggable_region() const { return draggable_region_.get(); }

  // Called from CefOverlayViewHost::SetOverlayBounds().
  void OnOverlayBoundsChanged();

  // Returns the NonClientFrameView for this Window. May be nullptr.
  views::NonClientFrameView* GetNonClientFrameView() const;

  // Optionally modify the bounding box for the Chrome Find bar.
  void UpdateFindBarBoundingBox(gfx::Rect* bounds) const;

  // Optionally modify the top inset for Chrome dialogs.
  void UpdateDialogTopInset(int* dialog_top_y) const;

  std::optional<float> GetTitlebarHeight(bool required) const;
  bool IsFrameless() const { return is_frameless_; }

  // Called before ThemeChanged() for native or Chrome theme changes.
  void OnThemeColorsChanged(bool chrome_theme);

  // The Widget that hosts us, if we're a modal dialog. May return nullptr
  // during initialization and destruction.
  views::Widget* host_widget() const;

  bool IsAlloyStyle() const { return is_alloy_style_; }
  bool IsChromeStyle() const { return !is_alloy_style_; }

  Delegate* window_delegate() const { return window_delegate_.get(); }

 private:
  // Called after Widget teardown starts, before |this| is deleted.
  void DeleteDelegate();

  void MoveOverlaysIfNecessary();
  void InvalidateExclusionRegions();

  void UpdateBoundingBox(gfx::Rect* bounds, bool add_titlebar_height) const;

  // Not owned by this object.
  raw_ptr<Delegate> window_delegate_;

  // True if the window is Alloy style, otherwise Chrome style.
  const bool is_alloy_style_;

  // True if the window is frameless. It might still be resizable and draggable.
  bool is_frameless_ = false;

  std::u16string title_;
  CefRefPtr<CefImage> window_icon_;
  CefRefPtr<CefImage> window_app_icon_;

  std::unique_ptr<SkRegion> draggable_region_;
  std::vector<gfx::Rect> draggable_rects_;

  mutable int last_dialog_top_y_ = -1;
  mutable int last_dialog_top_inset_ = -1;

  // Tracks the Widget that hosts us, if we're a modal dialog.
  std::unique_ptr<WidgetDestructionObserver> host_widget_destruction_observer_;

  // Hosts for overlay widgets.
  std::vector<raw_ptr<CefOverlayViewHost>> overlay_hosts_;

  base::WeakPtrFactory<CefWindowView> weak_ptr_factory_{this};
};

#endif  // CEF_LIBCEF_BROWSER_VIEWS_WINDOW_VIEW_H_