/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file ghost/intern/GHOST_SystemX11.h
 *  \ingroup GHOST
 * Declaration of GHOST_SystemX11 class.
 */

#ifndef __GHOST_SYSTEMX11_H__
#define __GHOST_SYSTEMX11_H__

#include <X11/Xlib.h>
#include <GL/glx.h>

#include "GHOST_System.h"
#include "../GHOST_Types.h"

// For tablets
#ifdef WITH_X11_XINPUT
#  include <X11/extensions/XInput.h>
#endif

#if defined(WITH_X11_XINPUT) && defined(X_HAVE_UTF8_STRING)
#  define GHOST_X11_RES_NAME  "Blender" /* res_name */
#  define GHOST_X11_RES_CLASS "Blender" /* res_class */
#endif

/* generic error handlers */
int GHOST_X11_ApplicationErrorHandler(Display *display, XErrorEvent *theEvent);
int GHOST_X11_ApplicationIOErrorHandler(Display *display);

class GHOST_WindowX11;

/**
 * X11 Implementation of GHOST_System class.
 * \see GHOST_System.
 * \author	Laurence Bourn
 * \date	October 26, 2001
 */

class GHOST_SystemX11 : public GHOST_System {
public:

	/**
	 * Constructor
	 * this class should only be instanciated by GHOST_ISystem.
	 */

	GHOST_SystemX11(
	    );
	
	/**
	 * Destructor.
	 */
	virtual ~GHOST_SystemX11();


	GHOST_TSuccess
	init(
	    );


	/**
	 * \section Interface Inherited from GHOST_ISystem
	 */

	/**
	 * Returns the system time.
	 * Returns the number of milliseconds since the start of the system process.
	 * \return The number of milliseconds.
	 */
	GHOST_TUns64
	getMilliSeconds(
	    ) const;
	

	/**
	 * Returns the number of displays on this system.
	 * \return The number of displays.
	 */
	GHOST_TUns8
	getNumDisplays(
	    ) const;

	/**
	 * Returns the dimensions of the main display on this system.
	 * \return The dimension of the main display.
	 */
	void
	getMainDisplayDimensions(
	    GHOST_TUns32& width,
	    GHOST_TUns32& height
	    ) const;

	/**
	 * Returns the dimensions of all displays on this system.
	 * \return The dimension of the main display.
	 */
	void
	getAllDisplayDimensions(
	    GHOST_TUns32& width,
	    GHOST_TUns32& height
	    ) const;

	/**
	 * Create a new window.
	 * The new window is added to the list of windows managed. 
	 * Never explicitly delete the window, use disposeWindow() instead.
	 * \param	title	The name of the window (displayed in the title bar of the window if the OS supports it).
	 * \param	left		The coordinate of the left edge of the window.
	 * \param	top		The coordinate of the top edge of the window.
	 * \param	width		The width the window.
	 * \param	height		The height the window.
	 * \param	state		The state of the window when opened.
	 * \param	type		The type of drawing context installed in this window.
	 * \param       stereoVisual    Create a stereo visual for quad buffered stereo.
	 * \param	parentWindow    Parent (embedder) window
	 * \return	The new window (or 0 if creation failed).
	 */
	GHOST_IWindow *
	createWindow(
	    const STR_String& title,
	    GHOST_TInt32 left,
	    GHOST_TInt32 top,
	    GHOST_TUns32 width,
	    GHOST_TUns32 height,
	    GHOST_TWindowState state,
	    GHOST_TDrawingContextType type,
	    const bool stereoVisual,
	    const GHOST_TUns16 numOfAASamples = 0,
	    const GHOST_TEmbedderWindowID parentWindow = 0
	    );

	/**
	 * \section Interface Inherited from GHOST_ISystem
	 */

	/**
	 * Retrieves events from the system and stores them in the queue.
	 * \param waitForEvent Flag to wait for an event (or return immediately).
	 * \return Indication of the presence of events.
	 */
	bool
	processEvents(
	    bool waitForEvent
	    );

	/**
	 * \section Interface Inherited from GHOST_System
	 */
	GHOST_TSuccess
	getCursorPosition(
	    GHOST_TInt32& x,
	    GHOST_TInt32& y
	    ) const;
	
	GHOST_TSuccess
	setCursorPosition(
	    GHOST_TInt32 x,
	    GHOST_TInt32 y
	    );

	/**
	 * Returns the state of all modifier keys.
	 * \param keys	The state of all modifier keys (true == pressed).
	 * \return		Indication of success.
	 */
	GHOST_TSuccess
	getModifierKeys(
	    GHOST_ModifierKeys& keys
	    ) const;

	/**
	 * Returns the state of the mouse buttons (ouside the message queue).
	 * \param buttons	The state of the buttons.
	 * \return			Indication of success.
	 */
	GHOST_TSuccess
	getButtons(
	    GHOST_Buttons& buttons
	    ) const;

	/**
	 * \section Interface Dirty
	 * Flag a window as dirty. This will
	 * generate a GHOST window update event on a call to processEvents() 
	 */

	void
	addDirtyWindow(
	    GHOST_WindowX11 *bad_wind
	    );
  
 
	/**
	 * return a pointer to the X11 display structure
	 */

	Display *
	getXDisplay(
	        ) {
		return m_display;
	}	

#if defined(WITH_X11_XINPUT) && defined(X_HAVE_UTF8_STRING)
	XIM
	getX11_XIM()
	{
		return m_xim;
	}
#endif

	/* Helped function for get data from the clipboard. */
	void getClipboard_xcout(XEvent evt, Atom sel, Atom target,
	                        unsigned char **txt, unsigned long *len,
	                        unsigned int *context) const;

	/**
	 * Returns unsinged char from CUT_BUFFER0
	 * \param selection		Get selection, X11 only feature
	 * \return				Returns the Clipboard indicated by Flag
	 */
	GHOST_TUns8 *getClipboard(bool selection) const;
	
	/**
	 * Puts buffer to system clipboard
	 * \param buffer	The buffer to copy to the clipboard
	 * \param selection	Set the selection into the clipboard, X11 only feature
	 */
	void putClipboard(GHOST_TInt8 *buffer, bool selection) const;

#ifdef WITH_XDND
	/**
	 * Creates a drag'n'drop event and pushes it immediately onto the event queue. 
	 * Called by GHOST_DropTargetX11 class.
	 * \param eventType The type of drag'n'drop event
	 * \param draggedObjectType The type object concerned (currently array of file names, string, ?bitmap)
	 * \param mouseX x mouse coordinate (in window coordinates)
	 * \param mouseY y mouse coordinate
	 * \param window The window on which the event occurred
	 * \return Indication whether the event was handled. 
	 */
	static GHOST_TSuccess pushDragDropEvent(GHOST_TEventType eventType, GHOST_TDragnDropTypes draggedObjectType, GHOST_IWindow *window, int mouseX, int mouseY, void *data);
#endif

	/**
	 * \see GHOST_ISystem
	 */
	int toggleConsole(int action) {
		return 0;
	}

#ifdef WITH_X11_XINPUT
	typedef struct GHOST_TabletX11 {
		XDevice *StylusDevice;
		XDevice *EraserDevice;

		XID StylusID, EraserID;

		int MotionEvent;
		int ProxInEvent;
		int ProxOutEvent;

		int PressureLevels;
		int XtiltLevels, YtiltLevels;
	} GHOST_TabletX11;

	GHOST_TabletX11 &GetXTablet()
	{
		return m_xtablet;
	}
#endif // WITH_X11_XINPUT

	struct {
		/**
		 * Atom used for ICCCM, WM-spec and Motif.
		 * We only need get this atom at the start, it's relative
		 * to the display not the window and are public for every
		 * window that need it.
		 */
		Atom WM_STATE;
		Atom WM_CHANGE_STATE;
		Atom _NET_WM_STATE;
		Atom _NET_WM_STATE_MAXIMIZED_HORZ;
		Atom _NET_WM_STATE_MAXIMIZED_VERT;
		Atom _NET_WM_STATE_FULLSCREEN;
		Atom _MOTIF_WM_HINTS;
		Atom WM_TAKE_FOCUS;
		Atom WM_PROTOCOLS;
		Atom WM_DELETE_WINDOW;

		/* Atoms for Selection, copy & paste. */
		Atom TARGETS;
		Atom STRING;
		Atom COMPOUND_TEXT;
		Atom TEXT;
		Atom CLIPBOARD;
		Atom PRIMARY;
		Atom XCLIP_OUT;
		Atom INCR;
		Atom UTF8_STRING;
#ifdef WITH_X11_XINPUT
		Atom TABLET;
#endif
	} m_atom;

private:

	Display *m_display;
#if defined(WITH_X11_XINPUT) && defined(X_HAVE_UTF8_STRING)
	XIM m_xim;
#endif

#ifdef WITH_X11_XINPUT
	/* Tablet devices */
	GHOST_TabletX11 m_xtablet;
#endif

	/// The vector of windows that need to be updated.
	std::vector<GHOST_WindowX11 *> m_dirty_windows;

	/// Start time at initialization.
	GHOST_TUns64 m_start_time;

	/// A vector of keyboard key masks
	char m_keyboard_vector[32];

	/* to prevent multiple warp, we store the time of the last warp event
	 *  and stop accumulating all events generated before that */
	Time m_last_warp;

	/**
	 * Return the ghost window associated with the
	 * X11 window xwind
	 */

#if defined(WITH_X11_XINPUT) && defined(X_HAVE_UTF8_STRING)
	bool openX11_IM();
#endif

#ifdef WITH_X11_XINPUT
	void initXInputDevices();
#endif

	GHOST_WindowX11 *
	findGhostWindow(
	    Window xwind
	    ) const;

	void
	processEvent(
	    XEvent *xe
	    );

	Time
	lastEventTime(
	    Time default_time
	    );

	bool
	generateWindowExposeEvents(
	    );
};

#endif

