/*
 * ***** 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_SystemWin32.h
 *  \ingroup GHOST
 * Declaration of GHOST_SystemWin32 class.
 */

#ifndef __GHOST_SYSTEMWIN32_H__
#define __GHOST_SYSTEMWIN32_H__

#ifndef WIN32
#error WIN32 only!
#endif // WIN32

#ifndef __MINGW64__
#define _WIN32_WINNT 0x501 // require Windows XP or newer
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <ole2.h> // for drag-n-drop

#include "GHOST_System.h"

class GHOST_EventButton;
class GHOST_EventCursor;
class GHOST_EventKey;
class GHOST_EventWheel;
class GHOST_EventWindow;
class GHOST_EventDragnDrop;

class GHOST_WindowWin32;

/**
 * WIN32 Implementation of GHOST_System class.
 * \see GHOST_System.
 * \author	Maarten Gribnau
 * \date	May 10, 2001
 */
class GHOST_SystemWin32 : public GHOST_System {
public:
	/**
	 * Constructor.
	 */
	GHOST_SystemWin32();

	/**
	 * Destructor.
	 */
	~GHOST_SystemWin32();

	/***************************************************************************************
	 ** Time(r) functionality
	 ***************************************************************************************/

	/**
	 * Returns the system time.
	 * Returns the number of milliseconds since the start of the system process.
	 * This overloaded method uses the high frequency timer if available.
	 * \return The number of milliseconds.
	 */
	GHOST_TUns64 getMilliSeconds() const;

	/***************************************************************************************
	 ** Display/window management functionality
	 ***************************************************************************************/

	/**
	 * 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	Stereo visual for quad buffered stereo.
	 * \param	numOfAASamples	Number of samples used for AA (zero if no AA)
	 * \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,
	    GHOST_GLSettings glSettings,
	    const bool exclusive = false,
	    const GHOST_TEmbedderWindowID parentWindow = 0);

	/***************************************************************************************
	 ** Event management functionality
	 ***************************************************************************************/

	/**
	 * Gets 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);
	

	/***************************************************************************************
	 ** Cursor management functionality
	 ***************************************************************************************/

	/**
	 * Returns the current location of the cursor (location in screen coordinates)
	 * \param x			The x-coordinate of the cursor.
	 * \param y			The y-coordinate of the cursor.
	 * \return			Indication of success.
	 */
	GHOST_TSuccess getCursorPosition(GHOST_TInt32& x, GHOST_TInt32& y) const;

	/**
	 * Updates the location of the cursor (location in screen coordinates).
	 * \param x			The x-coordinate of the cursor.
	 * \param y			The y-coordinate of the cursor.
	 * \return			Indication of success.
	 */
	GHOST_TSuccess setCursorPosition(GHOST_TInt32 x, GHOST_TInt32 y);

	/***************************************************************************************
	 ** Access to mouse button and keyboard states.
	 ***************************************************************************************/

	/**
	 * 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;

	/**
	 * Returns unsigned char from CUT_BUFFER0
	 * \param selection		Used by X11 only
	 * \return				Returns the Clipboard
	 */
	GHOST_TUns8 *getClipboard(bool selection) const;
	
	/**
	 * Puts buffer to system clipboard
	 * \param selection		Used by X11 only
	 * \return				No return
	 */
	void putClipboard(GHOST_TInt8 *buffer, bool selection) const;

	/**
	 * Creates a drag'n'drop event and pushes it immediately onto the event queue. 
	 * Called by GHOST_DropTargetWin32 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_WindowWin32 *window, int mouseX, int mouseY, void *data);
	
/**
 * Confirms quitting he program when there is just one window left open
 * in the application
 */
	int confirmQuit(GHOST_IWindow *window) const;

protected:
	/**
	 * Initializes the system.
	 * For now, it just registers the window class (WNDCLASS).
	 * \return A success value.
	 */
	GHOST_TSuccess init();

	/**
	 * Closes the system down.
	 * \return A success value.
	 */
	GHOST_TSuccess exit();
	
	/**
	 * Converts raw WIN32 key codes from the wndproc to GHOST keys.
	 * \param vKey		The virtual key from hardKey
	 * \param ScanCode	The ScanCode of pressed key (similar to PS/2 Set 1)
	 * \param extend	Flag if key is not primly (left or right)
	 * \return The GHOST key (GHOST_kKeyUnknown if no match).
	 */
	GHOST_TKey convertKey(short vKey, short ScanCode, short extend) const;

	/**
	 * Catches raw WIN32 key codes from WM_INPUT in the wndproc.
	 * \param raw		RawInput structure with detailed info about the key event
	 * \param keyDown	Pointer flag that specify if a key is down
	 * \param vk		Pointer to virtual key
	 * \return The GHOST key (GHOST_kKeyUnknown if no match).
	 */
	GHOST_TKey hardKey(RAWINPUT const& raw, int *keyDown, char *vk);

	/**
	 * Creates mouse button event.
	 * \param type		The type of event to create.
	 * \param window	The window receiving the event (the active window).
	 * \param mask		The button mask of this event.
	 * \return The event created.
	 */
	static GHOST_EventButton *processButtonEvent(GHOST_TEventType type, GHOST_WindowWin32 *window, GHOST_TButtonMask mask);

	/**
	 * Creates cursor event.
	 * \param type		The type of event to create.
	 * \param window	The window receiving the event (the active window).
	 * \return The event created.
	 */
	static GHOST_EventCursor *processCursorEvent(GHOST_TEventType type, GHOST_WindowWin32 *window);

	/**
	 * Creates a mouse wheel event.
	 * \param window	The window receiving the event (the active window).
	 * \param wParam	The wParam from the wndproc
	 * \param lParam	The lParam from the wndproc
	 */
	static GHOST_EventWheel *processWheelEvent(GHOST_WindowWin32 *window, WPARAM wParam, LPARAM lParam);

	/**
	 * Creates a key event and updates the key data stored locally (m_modifierKeys).
	 * In most cases this is a straightforward conversion of key codes.
	 * For the modifier keys however, we want to distinguish left and right keys.
	 * \param window	The window receiving the event (the active window).
	 * \param raw		RawInput structure with detailed info about the key event
	 */
	static GHOST_EventKey *processKeyEvent(GHOST_WindowWin32 *window, RAWINPUT const& raw);

	/**
	 * Process special keys (VK_OEM_*), to see if current key layout
	 * gives us anything special, like ! on french AZERTY.
	 * \param vKey		The virtual key from hardKey
	 * \param ScanCode	The ScanCode of pressed key (simular to PS/2 Set 1)
	 */
	GHOST_TKey processSpecialKey(short vKey, short scanCode) const;

	/** 
	 * Creates a window event.
	 * \param type		The type of event to create.
	 * \param window	The window receiving the event (the active window).
	 * \return The event created.
	 */
	static GHOST_Event *processWindowEvent(GHOST_TEventType type, GHOST_WindowWin32 *window);

#ifdef WITH_INPUT_IME
	/**
	 * Creates a IME event.
	 * \param type		The type of event to create.
	 * \param window		The window receiving the event (the active window).
	 * \param data		IME data.
	 * \return The event created.
	 */
	static GHOST_Event *processImeEvent(GHOST_TEventType type, GHOST_WindowWin32 *window, GHOST_TEventImeData *data);
#endif // WITH_INPUT_IME

	/**
	 * Handles minimum window size.
	 * \param minmax	The MINMAXINFO structure.
	 */
	static void processMinMaxInfo(MINMAXINFO *minmax);

#ifdef WITH_INPUT_NDOF
	/**
	 * Handles Motion and Button events from a SpaceNavigator or related device.
	 * Instead of returning an event object, this function communicates directly
	 * with the GHOST_NDOFManager.
	 * \param raw		RawInput structure with detailed info about the NDOF event
	 * \return Whether an event was generated and sent.
	 */
	bool processNDOF(RAWINPUT const& raw);
#endif

	/**
	 * Returns the local state of the modifier keys (from the message queue).
	 * \param keys The state of the keys.
	 */
	inline void retrieveModifierKeys(GHOST_ModifierKeys& keys) const;

	/**
	 * Stores the state of the modifier keys locally.
	 * For internal use only!
	 * param keys The new state of the modifier keys.
	 */
	inline void storeModifierKeys(const GHOST_ModifierKeys& keys);
	
	/**
	 * Check current key layout for AltGr
	 */
	inline void handleKeyboardChange(void);

	/**
	 * Windows call back routine for our window class.
	 */
	static LRESULT WINAPI s_wndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);

	/**
	 * Toggles console
	 * \param action
	 * - 0 - Hides
	 * - 1 - Shows
	 * - 2 - Toggles
	 * - 3 - Hides if it runs not from  command line
	 * - * - Does nothing
	 * \return current status (1 -visible, 0 - hidden)
	 */
	int toggleConsole(int action);
	
	/** The current state of the modifier keys. */
	GHOST_ModifierKeys m_modifierKeys;
	/** State variable set at initialization. */
	bool m_hasPerformanceCounter;
	/** High frequency timer variable. */
	__int64 m_freq;
	/** High frequency timer variable. */
	__int64 m_start;
	/** AltGr on current keyboard layout. */
	bool m_hasAltGr;
	/** language identifier. */
	WORD m_langId;
	/** stores keyboard layout. */
	HKL m_keylayout;

	/** Console status */
	int m_consoleStatus;
};

inline void GHOST_SystemWin32::retrieveModifierKeys(GHOST_ModifierKeys& keys) const
{
	keys = m_modifierKeys;
}

inline void GHOST_SystemWin32::storeModifierKeys(const GHOST_ModifierKeys& keys)
{
	m_modifierKeys = keys;
}

inline void GHOST_SystemWin32::handleKeyboardChange(void)
{
	m_keylayout = GetKeyboardLayout(0); // get keylayout for current thread
	int i;
	SHORT s;

	// save the language identifier.
	m_langId = LOWORD(m_keylayout);

	for (m_hasAltGr = false, i = 32; i < 256; ++i) {
		s = VkKeyScanEx((char)i, m_keylayout);
		// s == -1 means no key that translates passed char code
		// high byte contains shift state. bit 2 ctrl pressed, bit 4 alt pressed
		// if both are pressed, we have AltGr keycombo on keylayout
		if (s != -1 && (s & 0x600) == 0x600) {
			m_hasAltGr = true;
			break;
		}
	}
}
#endif // __GHOST_SYSTEMWIN32_H__