/*
 *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
 *
 *Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 *"Software"), to deal in the Software without restriction, including
 *without limitation the rights to use, copy, modify, merge, publish,
 *distribute, sublicense, and/or sell copies of the Software, and to
 *permit persons to whom the Software is furnished to do so, subject to
 *the following conditions:
 *
 *The above copyright notice and this permission notice shall be
 *included in all copies or substantial portions of the Software.
 *
 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR
 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *Except as contained in this notice, the name of the XFree86 Project
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from the XFree86 Project.
 *
 * Authors:	Dakshinamurthy Karra
 *		Suhaib M Siddiqi
 *		Peter Busch
 *		Harold L Hunt II
 */

#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif
#include "win.h"

#if defined(XFree86Server) && defined(XINPUT)
#include "inputstr.h"

/* Peek the internal button mapping */
static CARD8 const *g_winMouseButtonMap = NULL;
#endif


/*
 * Local prototypes
 */

static void
winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl);


static void
winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl)
{
}


/*
 * See Porting Layer Definition - p. 18
 * This is known as a DeviceProc
 */

int
winMouseProc (DeviceIntPtr pDeviceInt, int iState)
{
  int 			lngMouseButtons, i;
  int			lngWheelEvents = 2;
  CARD8			*map;
  DevicePtr		pDevice = (DevicePtr) pDeviceInt;

  switch (iState)
    {
    case DEVICE_INIT:
      /* Get number of mouse buttons */
      lngMouseButtons = GetSystemMetrics(SM_CMOUSEBUTTONS);

      /* Mapping of windows events to X events:
       * LEFT:1 MIDDLE:2 RIGHT:3
       * SCROLL_UP:4 SCROLL_DOWN:5
       * XBUTTON 1:6 XBUTTON 2:7 ...
       *
       * To map scroll wheel correctly we need at least the 3 normal buttons
       */
      if (lngMouseButtons < 3)
        lngMouseButtons = 3;
      winMsg(X_PROBED, "%d mouse buttons found\n", lngMouseButtons);

      /* allocate memory: 
       * number of buttons + 2x mouse wheel event + 1 extra (offset for map) 
       */
      map = malloc(sizeof(CARD8) * (lngMouseButtons + lngWheelEvents + 1));
    
      /* initalize button map */ 
      map[0] = 0;
      for (i=1; i <= lngMouseButtons + lngWheelEvents; i++)
      	map[i] = i;
      InitPointerDeviceStruct (pDevice,
			       map,
			       lngMouseButtons + lngWheelEvents,
			       GetMotionHistory,
			       winMouseCtrl,
			       GetMotionHistorySize(),
			       2);
      free(map);

#if defined(XFree86Server) && defined(XINPUT)
      g_winMouseButtonMap = pDeviceInt->button->map;
#endif
      break;

    case DEVICE_ON:
      pDevice->on = TRUE;
      break;

    case DEVICE_CLOSE:
#if defined(XFree86Server) && defined(XINPUT)
      g_winMouseButtonMap = NULL;
#endif
    case DEVICE_OFF:
      pDevice->on = FALSE;
      break;
    }
  return Success;
}


/* Handle the mouse wheel */
int
winMouseWheel (ScreenPtr pScreen, int iDeltaZ)
{
  winScreenPriv(pScreen);
  int button; /* Button4 or Button5 */

  /* Button4 = WheelUp */
  /* Button5 = WheelDown */

  /* Do we have any previous delta stored? */
  if ((pScreenPriv->iDeltaZ > 0
       && iDeltaZ > 0)
      || (pScreenPriv->iDeltaZ < 0
	  && iDeltaZ < 0))
    {
      /* Previous delta and of same sign as current delta */
      iDeltaZ += pScreenPriv->iDeltaZ;
      pScreenPriv->iDeltaZ = 0;
    }
  else
    {
      /*
       * Previous delta of different sign, or zero.
       * We will set it to zero for either case,
       * as blindly setting takes just as much time
       * as checking, then setting if necessary :)
       */
      pScreenPriv->iDeltaZ = 0;
    }

  /*
   * Only process this message if the wheel has moved further than
   * WHEEL_DELTA
   */
  if (iDeltaZ >= WHEEL_DELTA || (-1 * iDeltaZ) >= WHEEL_DELTA)
    {
      pScreenPriv->iDeltaZ = 0;
	  
      /* Figure out how many whole deltas of the wheel we have */
      iDeltaZ /= WHEEL_DELTA;
    }
  else
    {
      /*
       * Wheel has not moved past WHEEL_DELTA threshold;
       * we will store the wheel delta until the threshold
       * has been reached.
       */
      pScreenPriv->iDeltaZ = iDeltaZ;
      return 0;
    }

  /* Set the button to indicate up or down wheel delta */
  if (iDeltaZ > 0)
    {
      button = Button4;
    }
  else
    {
      button = Button5;
    }

  /*
   * Flip iDeltaZ to positive, if negative,
   * because always need to generate a *positive* number of
   * button clicks for the Z axis.
   */
  if (iDeltaZ < 0)
    {
      iDeltaZ *= -1;
    }

  /* Generate X input messages for each wheel delta we have seen */
  while (iDeltaZ--)
    {
      /* Push the wheel button */
      winMouseButtonsSendEvent (ButtonPress, button);

      /* Release the wheel button */
      winMouseButtonsSendEvent (ButtonRelease, button);
    }

  return 0;
}


/*
 * Enqueue a mouse button event
 */

void
winMouseButtonsSendEvent (int iEventType, int iButton)
{
  xEvent		xCurrentEvent;

  /* Load an xEvent and enqueue the event */
  xCurrentEvent.u.u.type = iEventType;
#if defined(XFree86Server) && defined(XINPUT)
  if (g_winMouseButtonMap)
    xCurrentEvent.u.u.detail = g_winMouseButtonMap[iButton];
  else
#endif
  xCurrentEvent.u.u.detail = iButton;
  xCurrentEvent.u.keyButtonPointer.time
    = g_c32LastInputEventTime = GetTickCount ();
  mieqEnqueue (&xCurrentEvent);
}


/*
 * Decide what to do with a Windows mouse message
 */

int
winMouseButtonsHandle (ScreenPtr pScreen,
		       int iEventType, int iButton,
		       WPARAM wParam)
{
  winScreenPriv(pScreen);
  winScreenInfo		*pScreenInfo = pScreenPriv->pScreenInfo;

  /* Send button events right away if emulate 3 buttons is off */
  if (pScreenInfo->iE3BTimeout == WIN_E3B_OFF)
    {
      /* Emulate 3 buttons is off, send the button event */
      winMouseButtonsSendEvent (iEventType, iButton);
      return 0;
    }

  /* Emulate 3 buttons is on, let the fun begin */
  if (iEventType == ButtonPress
      && pScreenPriv->iE3BCachedPress == 0
      && !pScreenPriv->fE3BFakeButton2Sent)
    {
      /*
       * Button was pressed, no press is cached,
       * and there is no fake button 2 release pending.
       */

      /* Store button press type */
      pScreenPriv->iE3BCachedPress = iButton;

      /*
       * Set a timer to send this button press if the other button
       * is not pressed within the timeout time.
       */
      SetTimer (pScreenPriv->hwndScreen,
		WIN_E3B_TIMER_ID,
		pScreenInfo->iE3BTimeout,
		NULL);
    }
  else if (iEventType == ButtonPress
	   && pScreenPriv->iE3BCachedPress != 0
	   && pScreenPriv->iE3BCachedPress != iButton
	   && !pScreenPriv->fE3BFakeButton2Sent)
    {
      /*
       * Button press is cached, other button was pressed,
       * and there is no fake button 2 release pending.
       */

      /* Mouse button was cached and other button was pressed */
      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);
      pScreenPriv->iE3BCachedPress = 0;

      /* Send fake middle button */
      winMouseButtonsSendEvent (ButtonPress, Button2);

      /* Indicate that a fake middle button event was sent */
      pScreenPriv->fE3BFakeButton2Sent = TRUE;
    }
  else if (iEventType == ButtonRelease
	   && pScreenPriv->iE3BCachedPress == iButton)
    {
      /*
       * Cached button was released before timer ran out,
       * and before the other mouse button was pressed.
       */
      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);
      pScreenPriv->iE3BCachedPress = 0;

      /* Send cached press, then send release */
      winMouseButtonsSendEvent (ButtonPress, iButton);
      winMouseButtonsSendEvent (ButtonRelease, iButton);
    }
  else if (iEventType == ButtonRelease
	   && pScreenPriv->fE3BFakeButton2Sent
	   && !(wParam & MK_LBUTTON)
	   && !(wParam & MK_RBUTTON))
    {
      /*
       * Fake button 2 was sent and both mouse buttons have now been released
       */
      pScreenPriv->fE3BFakeButton2Sent = FALSE;
      
      /* Send middle mouse button release */
      winMouseButtonsSendEvent (ButtonRelease, Button2);
    }
  else if (iEventType == ButtonRelease
	   && pScreenPriv->iE3BCachedPress == 0
	   && !pScreenPriv->fE3BFakeButton2Sent)
    {
      /*
       * Button was release, no button is cached,
       * and there is no fake button 2 release is pending.
       */
      winMouseButtonsSendEvent (ButtonRelease, iButton);
    }

  return 0;
}