/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/* This is a C++ class for handling a GUI, and associated widgets */

#ifndef NUVIE_GUI_GUI_H
#define NUVIE_GUI_GUI_H

#include "ultima/nuvie/gui/gui_status.h"
#include "ultima/nuvie/gui/gui_drag_manager.h"
#include "ultima/nuvie/gui/widgets/gui_widget.h"
#include "ultima/nuvie/gui/gui_font.h"
#include "common/events.h"

namespace Ultima {
namespace Nuvie {

class Configuration;
class Screen;
class GUI_Color;

#define GUI_FULL_REDRAW true

class GUI {

protected:

	static GUI *gui;
	const Configuration *config;

	/* The display surface */
	Screen *screen;

	GUI_Font *gui_font;
	GUI_DragManager *gui_drag_manager;

	/* Pointers for an array of widgets */
	int maxwidgets;
	int numwidgets;
	GUI_Widget **widgets;

	/* All input will go to this widget first. */
	GUI_Widget *focused_widget; // SB-X
	/* All input will go to this widget ONLY. */
	GUI_Widget *locked_widget; // SB-X
	/* All input will be ignored. */
	bool block_input; // SB-X

	/* Flag - whether or not the GUI is currently running */
	int running;

	/* Flag - whether or not the GUI needs to be displayed */
	int display;

	/* Flag - whether we are performing a drag and drop */
	bool dragging;

	bool full_redraw; // this forces all widgets to redraw on the next call to Display()

	// some default colours
	GUI_Color *selected_color;

public:
	static const int mouseclick_delay; /* SB-X */

	GUI(const Configuration *c, Screen *s);
	~GUI();

	/* Add a widget to the GUI.
	   The widget will be automatically deleted when the GUI is deleted.
	   This function returns 0, or -1 if the function ran out of memory.
	 */
	int AddWidget(GUI_Widget *widget);

	/* remove widget from gui system but don't delete it */
	bool removeWidget(GUI_Widget *widget);

	bool moveWidget(GUI_Widget *widget, uint32 dx, uint32 dy);

	/* force everything to redraw */
	void force_full_redraw();

	/* Display the GUI manually */
	void Display();

	/* Returns will return true if the GUI is still ready to handle
	   events after a call to Run(), and false if a widget or idle
	   function requested a quit.
	 */
	int Running(void) {
		return running;
	}

	/* Run the GUI.
	   This returns when either a widget requests a quit, the idle
	   function requests a quit, or the SDL window has been closed.
	   If 'once' is non-zero, you need to display the GUI yourself,
	   and the GUI event loop will run once and then return.
	   If 'multitaskfriendly' is non-zero AND idle is nullptr,
	   a 'WaitEvent' will be used instead of the CPU time
	   consuming 'PollEvent'. CAVE: Any widget-'idle'-procs WON'T
	   be executed then.
	 */
	void Run(GUI_IdleProc idle = nullptr, int once = 0, int multitaskfriendly = 0);

	/* Run Idle() on all widgets. */
	void Idle(); // SB-X

	static GUI *get_gui() {
		return gui;
	}
	GUI_Font *get_font();
	Screen *get_screen()             {
		return screen;
	}
	GUI_Widget *get_focused_widget() {
		return focused_widget;
	}
	GUI_Widget *get_locked_widget()  {
		return locked_widget;
	}
	bool get_block_input()           {
		return block_input;
	}

	//colors
	GUI_Color *get_selected_color() {
		return selected_color;
	}

	/* Function to pass an event to the GUI widgets */
	GUI_status HandleEvent(Common::Event *event);

	bool set_focus(GUI_Widget *widget);
	void clear_focus()  {
		set_focus(nullptr);
	}
	void lock_input(GUI_Widget *widget);
	void unlock_input() {
		lock_input(nullptr);
		unblock();
	}
	void block()   {
		block_input = true;
	}
	void unblock() {
		block_input = false;
	}
	Common::Path get_data_dir() const;

	uint16 get_width() const {
		return screen->get_width();
	}
	uint16 get_height() const {
		return screen->get_height();
	}
protected:

	/* Function to handle a GUI status */
	void HandleStatus(GUI_status status);

	void CleanupDeletedWidgets(bool redraw = false);

};

} // End of namespace Nuvie
} // End of namespace Ultima

#endif