//********************************** Banshee Engine (www.banshee3d.com) **************************************************//
//**************** Copyright (c) 2017 Marko Pintera (marko.pintera@gmail.com). All rights reserved. **********************//
#pragma once

#include "Prerequisites/BsPrerequisitesUtil.h"
#include "Math/BsVector2I.h"

#ifdef BS_COCOA_INTERNALS
#import <Cocoa/Cocoa.h>
#endif

#ifdef BS_COCOA_INTERNALS
@class BSWindowDelegate;
@class BSWindowListener;
@class BSView;
#endif

namespace bs
{
	class CocoaDropTarget;

	/** @addtogroup Internal-Utility
	 *  @{
	 */

	/** @addtogroup Platform-Utility-Internal
	 *  @{
	 */

	/**	Descriptor used for creating a platform specific native window. */
	struct WINDOW_DESC
	{
		String title;
		INT32 x = -1;
		INT32 y = -1;
		UINT32 width = 20;
		UINT32 height = 20;
		bool showDecorations = true;
		bool allowResize = true;
		bool modal = false;
		SPtr<PixelData> background;
	};

	/** Represents a Cocoa window. */
	class BS_UTILITY_EXPORT CocoaWindow
	{
	public:
#ifdef BS_COCOA_INTERNALS
		struct Pimpl
		{
			NSWindow* window;
			BSView* view;
			BSWindowListener* responder;
			BSWindowDelegate* delegate;

			NSUInteger style = 0;
			NSInteger windowNumber = 0;
			bool isFullscreen = false;
			NSRect windowedRect;
			bool isModal = false;
			UINT32 numDropTargets = 0;
			void* userData = nullptr;
		};
#else
		struct Pimpl;
#endif

		CocoaWindow(const WINDOW_DESC& desc);
		~CocoaWindow();

		/**	Returns the current area of the window, relative to the screen. */
		Rect2I getArea() const;

		/** Hides the window. */
		void hide();

		/** Shows (unhides) the window. */
		void show();

		/**	Minimizes the window. */
		void minimize();

		/**	Maximizes the window over the entire current screen. */
		void maximize();

		/**	Restores the window to original position and size if it is minimized or maximized. */
		void restore();

		/**	Change the size of the window. */
		void resize(UINT32 width, UINT32 height);

		/**	Reposition the window. */
		void move(INT32 left, INT32 top);

		/** Switches from fullscreen to windowed mode. */
		void setWindowed();

		/** Switches from windowed to fullscreen mode. */
		void setFullscreen();

		/**	Converts screen position into window local position. */
		Vector2I screenToWindowPos(const Vector2I& screenPos) const;

		/**	Converts window local position to screen position. */
		Vector2I windowToScreenPos(const Vector2I& windowPos) const;

		/**
		 * @name Internal
		 * @{
		 */

		/**
		 * Destroys the window, cleaning up any resources and removing it from the display. No further methods should be
		 * called on this object after it has been destroyed.
		 */
		void _destroy();

		/**
		 * Sets a portion of the window in which the user can click and drag in order to move the window. This is needed
		 * when window has no title bar, yet you still want to allow the user to drag it by clicking on some specific area
		 * (e.g. a title bar you manually render).
		 *
		 * @param[in]	rects	Areas of the window (relative to the window origin in top-left corner) in which the drag
		 * 						operation in allowed.
		 */
		void _setDragZones(const Vector<Rect2I>& rects);

		/** Attaches non-specific user data that can later be retrieved through _getUserData(). */
		void _setUserData(void* data);

		/** Returns user data attached to the object when _setUserData was called. */
		void* _getUserData() const;

		/**
		 * Registers the window with the drag and drop manager and allows it to accept file drop operations. Each call
		 * to this method must eventually be followed with _unregisterForDragAndDrop.
		 */
		void _registerForDragAndDrop();

		/**
		 * Unregisters the window from the drag and drop manager. This will need to be called multiple times if
		 * _registerForDragAndDrop was called multiple times.
		 */
		void _unregisterForDragAndDrop();

		/** Returns internal private data for use by friends. */
		Pimpl* _getPrivateData() const { return m; }

		/** @} */

	private:
		Pimpl* m;
	};

	/** @} */
	/** @} */
}