/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2005 John Fitzgibbons and others
Copyright (C) 2007-2008 Kristian Duske

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "quakedef.h"

static qboolean	no_mouse = false;

// mouse variables
cvar_t	m_filter = {"m_filter","0"};

// total accumulated mouse movement since last frame
// this gets updated from the main game loop via IN_MouseMove
static int	total_dx, total_dy = 0;

static int FilterMouseEvents (const SDL_Event *event)
{
	switch (event->type)
	{
	case SDL_MOUSEMOTION:
	case SDL_MOUSEBUTTONDOWN:
	case SDL_MOUSEBUTTONUP:
		return 0;
	}

	return 1;
}

void IN_Activate (void)
{
	if (no_mouse)
		return;

	if (SDL_WM_GrabInput(SDL_GRAB_QUERY) != SDL_GRAB_ON)
	{
		SDL_WM_GrabInput(SDL_GRAB_ON);
		if (SDL_WM_GrabInput(SDL_GRAB_QUERY) != SDL_GRAB_ON)
			Con_Printf("WARNING: SDL_WM_GrabInput(SDL_GRAB_ON) failed.\n");
	}

	if (SDL_ShowCursor(SDL_QUERY) != SDL_DISABLE)
	{
		SDL_ShowCursor(SDL_DISABLE);
		if (SDL_ShowCursor(SDL_QUERY) != SDL_DISABLE)
			Con_Printf("WARNING: SDL_ShowCursor(SDL_DISABLE) failed.\n");
	}

	if (SDL_GetEventFilter() != NULL)
		SDL_SetEventFilter(NULL);

	total_dx = 0;
	total_dy = 0;
}

void IN_Deactivate (qboolean free_cursor)
{
	if (no_mouse)
		return;

	if (free_cursor)
	{
		if (SDL_WM_GrabInput(SDL_GRAB_QUERY) != SDL_GRAB_OFF)
		{
			SDL_WM_GrabInput(SDL_GRAB_OFF);
			if (SDL_WM_GrabInput(SDL_GRAB_QUERY) != SDL_GRAB_OFF)
				Con_Printf("WARNING: SDL_WM_GrabInput(SDL_GRAB_OFF) failed.\n");
		}

		if (SDL_ShowCursor(SDL_QUERY) != SDL_ENABLE)
		{
			SDL_ShowCursor(SDL_ENABLE);
			if (SDL_ShowCursor(SDL_QUERY) != SDL_ENABLE)
				Con_Printf("WARNING: SDL_ShowCursor(SDL_ENABLE) failed.\n");
		}
	}

	// discard all mouse events when input is deactivated
	if (SDL_GetEventFilter() != FilterMouseEvents)
		SDL_SetEventFilter(FilterMouseEvents);
}

void IN_Init (void)
{
	BuildKeyMaps();

	if (SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL) == -1)
		Con_Printf("Warning: SDL_EnableKeyRepeat() failed.\n");

	if (COM_CheckParm("-nomouse"))
	{
		no_mouse = true;
		// discard all mouse events when input is deactivated
		SDL_SetEventFilter(FilterMouseEvents);
	}

	IN_Activate();
}

void IN_Shutdown (void)
{
	IN_Deactivate(true);
}

void IN_Commands (void)
{
// TODO: implement this for joystick support
}

extern cvar_t cl_maxpitch; //johnfitz -- variable pitch clamping
extern cvar_t cl_minpitch; //johnfitz -- variable pitch clamping


void IN_MouseMove(int dx, int dy)
{
	total_dx += dx;
	total_dy += dy;
}

void IN_Move (usercmd_t *cmd)
{
	int		dmx, dmy;

	/* TODO: fix this
	if (m_filter.value)
	{
		dmx = (2*mx - dmx) * 0.5;
		dmy = (2*my - dmy) * 0.5;
	}
	*/

	dmx = total_dx * sensitivity.value;
	dmy = total_dy * sensitivity.value;

	total_dx = 0;
	total_dy = 0;

	if ( (in_strafe.state & 1) || (lookstrafe.value && (in_mlook.state & 1) ))
		cmd->sidemove += m_side.value * dmx;
	else
		cl.viewangles[YAW] -= m_yaw.value * dmx;

	if (in_mlook.state & 1)
		V_StopPitchDrift ();

	if ( (in_mlook.state & 1) && !(in_strafe.state & 1))
	{
		cl.viewangles[PITCH] += m_pitch.value * dmy;
		//johnfitz -- variable pitch clamping
		if (cl.viewangles[PITCH] > cl_maxpitch.value)
			cl.viewangles[PITCH] = cl_maxpitch.value;
		if (cl.viewangles[PITCH] < cl_minpitch.value)
			cl.viewangles[PITCH] = cl_minpitch.value;
		//johnfitz
	}
	else
	{
		if ((in_strafe.state & 1) && noclip_anglehack)
			cmd->upmove -= m_forward.value * dmy;
		else
			cmd->forwardmove -= m_forward.value * dmy;
	}
}

void IN_ClearStates (void)
{
}