// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_QUICK_INSERT_VIEWS_QUICK_INSERT_PREVIEW_BUBBLE_CONTROLLER_H_
#define ASH_QUICK_INSERT_VIEWS_QUICK_INSERT_PREVIEW_BUBBLE_CONTROLLER_H_

#include <optional>

#include "ash/ash_export.h"
#include "ash/public/cpp/holding_space/holding_space_image.h"
#include "base/callback_list.h"
#include "base/files/file.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/scoped_observation.h"
#include "base/timer/timer.h"
#include "ui/views/widget/widget_observer.h"

namespace base {
class FilePath;
}

namespace views {
class View;
class Widget;
}  // namespace views

namespace ash {

class QuickInsertPreviewBubbleView;

class ASH_EXPORT QuickInsertPreviewBubbleController
    : public views::WidgetObserver {
 public:
  class Observer : public base::CheckedObserver {
   public:
    // Called when the bubble is shown or hidden.
    virtual void OnPreviewBubbleVisibilityChanged(bool visible) = 0;
  };

  QuickInsertPreviewBubbleController();
  QuickInsertPreviewBubbleController(
      const QuickInsertPreviewBubbleController&) = delete;
  QuickInsertPreviewBubbleController& operator=(
      const QuickInsertPreviewBubbleController&) = delete;
  ~QuickInsertPreviewBubbleController() override;

  // Creates the preview bubble if needed and shows it after a delay. If called
  // while a bubble was previously already created, the existing bubble is kept
  // but the delay to show the bubble (if not already shown) is reset.
  // `async_preview_image` must remain alive while the bubble is open.
  // `anchor_view` must not be `nullptr`.
  // Destroying `anchor_view` closes the bubble if it's shown.
  void ShowBubbleAfterDelay(HoldingSpaceImage* async_preview_image,
                            const base::FilePath& path,
                            views::View* anchor_view);

  // TODO: b/322899032 - Take in an `anchor_view` to avoid accidentally closing
  // the bubble view shown by a different anchor view.
  void CloseBubble();

  bool IsBubbleVisible() const;

  void AddObserver(Observer* observer);
  void RemoveObserver(Observer* observer);

  // Updates the bubble view labels for the currently open bubble.
  // If the bubble is not shown, this does nothing.
  // If `text` is empty, then the bubble view labels are hidden.
  void SetBubbleMainText(const std::u16string& text);

  // views::WidgetObserver:
  void OnWidgetDestroying(views::Widget* widget) override;

  void ShowBubbleImmediatelyForTesting(HoldingSpaceImage* async_preview_image,
                                       views::View* anchor_view);

  QuickInsertPreviewBubbleView* bubble_view_for_testing() const;

 private:
  void UpdateBubbleImage();

  void CreateBubbleWidget(HoldingSpaceImage* async_preview_image,
                          views::View* anchor_view);

  // Shows the bubble if one has been created. Does nothing if the bubble is
  // already being shown.
  void ShowBubble();

  // Timer to show the preview bubble after a delay.
  base::OneShotTimer show_bubble_timer_;

  raw_ptr<HoldingSpaceImage> async_preview_image_;

  // Owned by the bubble widget.
  raw_ptr<QuickInsertPreviewBubbleView> bubble_view_;

  base::ObserverList<Observer> observers_;

  base::CallbackListSubscription image_subscription_;
  base::ScopedObservation<views::Widget, views::WidgetObserver>
      widget_observation_{this};

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

}  // namespace ash

#endif  // ASH_QUICK_INSERT_VIEWS_QUICK_INSERT_PREVIEW_BUBBLE_CONTROLLER_H_