/*
   ui/ui.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_UI_H__
#define __INCLUDED_UI_H__

#include "ui/font.h"
#include "ui/palette.h"
#include "ui/widget.h"
#include "ui/window.h"

namespace ui
{

class UI : public Window
{
public:
	/// constructor
	UI();
	
	/// destructor
	~UI();
	
	/// list widgets
	void list() const;
	
	/// list meus
	void list_menus() const;
	
	/// reload menu files
	void load();
	
	/// make a window the active window
	void show_menu(const char *label);
	
	/// hide the active window
	void hide_menu();
	
	/// show previous window
	void previous_menu();
	
	/// return the active menu
	Window *active() {
		return ui_active_menu;
	}
	
	/// return the widget with global mouse focus
	inline Widget *mouse_focus() const {
		return ui_mouse_focus;
	}
	
	/// return the widget with global input focus
	inline Widget *input_focus() const {
		return ui_input_focus;
	}
	
	/// receive global mouse movement
	void input_mouse(const float x, const float y);
	
	/// receive global key input
	bool input_key(const bool pressed, const int key, const unsigned int modifier);
	
	/// run a user interface frame
	void frame();
	
	/* -- fonts ------------------------------------------------ */
	
	/// default small font
	inline const Font *font_small() const {
		return ui_font_small;
	}
	
	/// default medium font
	inline const Font *font_large() const {
		return ui_font_large;
	}
	
protected:
	typedef std::list<Window *> Menus;
	
	Menus::iterator find_menu(Window *menu);
	Window *find_menu(const char *label);

	void add_menu(Window *window);

	/* -- event handlers --------------------------------------- */
	
	/// handle keypress events
	virtual bool on_keypress(const int key, const unsigned int modifier);
	
	/// handle key release events
	virtual bool on_keyrelease(const int key, const unsigned int modifier);
	
private:
	Palette			*ui_palette;
	Font			*ui_font_small;
	Font			*ui_font_large;
	
	Window			*ui_active_menu;
	Widget			*ui_mouse_focus;
	Widget			*ui_input_focus;

	Menus			ui_menus;
	
	/// TODO move to separate object to handle mouse cursor drawing
	math::Vector2f		 mouse_cursor;
};

/// initialize the user interface
void init();

/// shutdown the user interface
void shutdown();

/// the global root window
UI *root();

}

#endif //  __INCLUDED_UI_H__