// Copyright 2014 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_WM_DEFAULT_STATE_H_
#define ASH_WM_DEFAULT_STATE_H_

#include "ash/wm/base_state.h"
#include "ash/wm/window_state.h"
#include "base/memory/raw_ptr.h"
#include "chromeos/ui/frame/multitask_menu/float_controller_base.h"
#include "ui/display/display.h"
#include "ui/gfx/geometry/rect.h"

namespace ash {
class SetBoundsWMEvent;

// DefaultState implements Ash behavior without state machine.
class DefaultState : public BaseState {
 public:
  explicit DefaultState(chromeos::WindowStateType initial_state_type);

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

  ~DefaultState() override;

  // WindowState::State:
  void AttachState(WindowState* window_state,
                   WindowState::State* previous_state) override;
  void DetachState(WindowState* window_state) override;

  // BaseState:
  void HandleWorkspaceEvents(WindowState* window_state,
                             const WMEvent* event) override;
  void HandleCompoundEvents(WindowState* window_state,
                            const WMEvent* event) override;
  void HandleBoundsEvents(WindowState* window_state,
                          const WMEvent* event) override;
  void HandleTransitionEvents(WindowState* window_state,
                              const WMEvent* event) override;

 private:
  // Sets the fullscreen/maximized bounds without animation. Returns true if
  // bounds were successfully set.
  bool SetMaximizedOrFullscreenBounds(WindowState* window_state);

  void SetBounds(WindowState* window_state,
                 const SetBoundsWMEvent* bounds_event);

  // Enters next state. This is used when the state moves from one to another
  // within the same desktop mode.
  void EnterToNextState(
      WindowState* window_state,
      chromeos::WindowStateType next_state_type,
      std::optional<chromeos::FloatStartLocation> float_start_location);

  // Reenters the current state. This is called when migrating from
  // previous desktop mode, and the window's state needs to re-construct the
  // state/bounds for this state.
  void ReenterToCurrentState(WindowState* window_state,
                             WindowState::State* state_in_previous_mode);

  // Animates to new window bounds, based on the current and previous state
  // type.
  void UpdateBoundsFromState(
      WindowState* window_state,
      chromeos::WindowStateType old_state_type,
      std::optional<chromeos::FloatStartLocation> float_start_location);

  // Updates the window bounds for display bounds, or display work area bounds
  // changes.
  // |ensure_full_window_visibility| - Whether the window bounds should be
  //     adjusted so they fully fit within the display work area. If false, the
  //     method will ensure minimum window visibility.
  void UpdateBoundsForDisplayOrWorkAreaBoundsChange(
      WindowState* window_state,
      bool ensure_full_window_visibility);

  // The saved window state for the case that the state gets de-/activated.
  gfx::Rect stored_bounds_;
  gfx::Rect stored_restore_bounds_;

  // The display state in which the mode got started.
  display::Display stored_display_state_;

  // The window state only gets remembered for DCHECK reasons.
  raw_ptr<WindowState> stored_window_state_ = nullptr;
};

}  // namespace ash

#endif  // ASH_WM_DEFAULT_STATE_H_