/*
	in_dos.c

	@description@

	Copyright (C) 1996-1997  Id Software, Inc.

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "dosisms.h"

#define AUX_FLAG_FREELOOK	0x00000001

typedef struct {
	long        interruptVector;
	char        deviceName[16];
	long        numAxes;
	long        numButtons;
	long        flags;

	vec3_t      viewangles;

// intended velocities
	float       forwardmove;
	float       sidemove;
	float       upmove;

	long        buttons;
} externControl_t;

/*
#define AUX_FLAG_FORCEFREELOOK	0x00000001	// r/o
#define AUX_FLAG_EXTENDED		0x00000002	// r/o
#define AUX_FLAG_RUN			0x00000004	// w/o
#define AUX_FLAG_STRAFE			0x00000008	// w/o
#define AUX_FLAG_FREELOOK		0x00000010	// w/o

#define AUX_MAP_UNDEFINED	0
#define AUX_MAP_PITCH		1
#define AUX_MAP_YAW			2
#define AUX_MAP_ROLL		3
#define AUX_MAP_FORWARD		4
#define AUX_MAP_SIDE		5
#define AUX_MAP_UP			6

typedef struct
{
	long    interruptVector;
	// r/o
	char    deviceName[16];
	// r/o
	long    numAxes;
			// r/o	1-6
	long	numButtons;			// r/o	0-32
	long	flags;				// see above
	byte	axisMapping[6];		// w/o	default = p,y,r,f,s,u
	float	axisValue[6];		// r/w
	float	sensitivity[6];		// w/o	default = 1.0
	long	buttons;			// r/o
	float	last_frame_time;	// w/o
} externControl_t;
*/

cvar_t     *m_filter;

qboolean    mouse_avail;
int         mouse_buttons;
int         mouse_oldbuttonstate;
int         mouse_buttonstate;
float       mouse_x, mouse_y;
float       old_mouse_x, old_mouse_y;


cvar_t     *in_joystick;
cvar_t     *joy_numbuttons;

qboolean    joy_avail;
int         joy_oldbuttonstate;
int         joy_buttonstate;

int         joyxl, joyxh, joyyl, joyyh;
int         joystickx, joysticky;

qboolean    need_center;

qboolean    extern_avail;
int         extern_buttons;
int         extern_oldbuttonstate;
int         extern_buttonstate;
cvar_t     *aux_look;
externControl_t *extern_control;
void        IN_StartupExternal (void);
void        IN_ExternalMove (usercmd_t *cmd);

void        IN_StartupJoystick (void);
qboolean    IN_ReadJoystick (void);


void
Toggle_AuxLook_f (void)
{
	if (aux_look->int_val)
		Cvar_Set ("auxlook", "0");
	else
		Cvar_Set ("auxlook", "1");
}


void
Force_CenterView_f (void)
{
	cl.viewangles[PITCH] = 0;
}


/*
===========
IN_StartupMouse
===========
*/
void
IN_StartupMouse (void)
{
	if (COM_CheckParm ("-nomouse"))
		return;

// check for mouse
	regs.x.ax = 0;
	dos_int86 (0x33);
	mouse_avail = regs.x.ax;
	if (!mouse_avail) {
		Con_Printf ("No mouse found\n");
		return;
	}

	mouse_buttons = regs.x.bx;
	if (mouse_buttons > 3)
		mouse_buttons = 3;
	Con_Printf ("%d-button mouse available\n", mouse_buttons);
}

/*
===========
IN_Init
===========
*/
void
IN_Init (void)
{
	int         i;

	m_filter = Cvar_Get ("m_filter", "0", CVAR_ARCHIVE, NULL, "None");
	in_joystick = Cvar_Get ("joystick", "0", CVAR_ARCHIVE, NULL, "None");
	joy_numbuttons = Cvar_Get ("joybuttons", "4", CVAR_ARCHIVE, NULL, "None");
	aux_look = Cvar_Get ("auxlook", "1", CVAR_ARCHIVE, NULL, "None");
	Cmd_AddCommand ("toggle_auxlook", Toggle_AuxLook_f, "No Description");
	Cmd_AddCommand ("force_centerview", Force_CenterView_f, "No Description");

	IN_StartupMouse ();
	IN_StartupJoystick ();

	i = COM_CheckParm ("-control");
	if (i) {
		extern_control = real2ptr (Q_atoi (com_argv[i + 1]));
		IN_StartupExternal ();
	}
}

/*
===========
IN_Shutdown
===========
*/
void
IN_Shutdown (void)
{

}


/*
===========
IN_Commands
===========
*/
void
IN_Commands (void)
{
	int         i;

	if (mouse_avail) {
		regs.x.ax = 3;					// read buttons
		dos_int86 (0x33);
		mouse_buttonstate = regs.x.bx;

		// perform button actions
		for (i = 0; i < mouse_buttons; i++) {
			if ((mouse_buttonstate & (1 << i)) &&
				!(mouse_oldbuttonstate & (1 << i))) {
				Key_Event (K_MOUSE1 + i, true);
			}
			if (!(mouse_buttonstate & (1 << i)) &&
				(mouse_oldbuttonstate & (1 << i))) {
				Key_Event (K_MOUSE1 + i, false);
			}
		}

		mouse_oldbuttonstate = mouse_buttonstate;
	}

	if (joy_avail) {
		joy_buttonstate = ((dos_inportb (0x201) >> 4) & 15) ^ 15;
		// perform button actions
		for (i = 0; i < joy_numbuttons->int_val; i++) {
			if ((joy_buttonstate & (1 << i)) &&
				!(joy_oldbuttonstate & (1 << i))) {
				Key_Event (K_JOY1 + i, true);
			}
			if (!(joy_buttonstate & (1 << i)) &&
				(joy_oldbuttonstate & (1 << i))) {
				Key_Event (K_JOY1 + i, false);
			}
		}

		joy_oldbuttonstate = joy_buttonstate;
	}

	if (extern_avail) {
		extern_buttonstate = extern_control->buttons;

		// perform button actions
		for (i = 0; i < extern_buttons; i++) {
			if ((extern_buttonstate & (1 << i)) &&
				!(extern_oldbuttonstate & (1 << i))) {
				Key_Event (K_AUX1 + i, true);
			}
			if (!(extern_buttonstate & (1 << i)) &&
				(extern_oldbuttonstate & (1 << i))) {
				Key_Event (K_AUX1 + i, false);
			}
		}

		extern_oldbuttonstate = extern_buttonstate;
	}

}


/*
===========
IN_Move
===========
*/
void
IN_MouseMove (void)
{
	int         mx, my;

	if (!mouse_avail)
		return;

	regs.x.ax = 11;						// read move
	dos_int86 (0x33);
	mx = (short) regs.x.cx;
	my = (short) regs.x.dx;

	if (m_filter->int_val) {
		mouse_x = (mx + old_mouse_x) * 0.5;
		mouse_y = (my + old_mouse_y) * 0.5;
	} else {
		mouse_x = mx;
		mouse_y = my;
	}
	old_mouse_x = mx;
	old_mouse_y = my;

	mouse_x *= sensitivity->value;
	mouse_y *= sensitivity->value;

// add mouse X/Y movement to cmd
	if ((in_strafe.state & 1) || (lookstrafe->int_val && (in_mlook.state & 1)))
		cmd->sidemove += m_side->value * mouse_x;
	else
		cl.viewangles[YAW] -= m_yaw->value * mouse_x;

	if ((in_mlook.state & 1) && !(in_strafe.state & 1)) {
		viewdelta.angles[PITCH] += mouse_y;
	} else {
		if (in_strafe.state & 1)
			viewdelta.position[1] -= mouse_y;
		else
			viewdelta.position[2] -= mouse_y;
	}
}

/*
===========
IN_JoyMove
===========
*/
void
IN_JoyMove (void)
{
	float       speed, aspeed;

	if (!joy_avail || !in_joystick->int_val)
		return;

	IN_ReadJoystick ();
	if (joysticky > joyyh * 2 || joystickx > joyxh * 2)
		return;							// assume something jumped in and
	// messed up the joystick
	// reading time (win 95)

	if (in_speed.state & 1)
		speed = cl_movespeedkey->value;
	else
		speed = 1;
	aspeed = speed * host_frametime;

	if (in_strafe.state & 1) {
		if (joystickx < joyxl)
			cmd->sidemove -= speed * cl_sidespeed->value;
		else if (joystickx > joyxh)
			cmd->sidemove += speed * cl_sidespeed->value;
	} else {
		if (joystickx < joyxl)
			cl.viewangles[YAW] += aspeed * cl_yawspeed->value;
		else if (joystickx > joyxh)
			cl.viewangles[YAW] -= aspeed * cl_yawspeed->value;
		cl.viewangles[YAW] = anglemod (cl.viewangles[YAW]);
	}

	if (in_mlook.state & 1) {
		if (m_pitch->value < 0)
			speed *= -1;

		if (joysticky < joyyl)
			cl.viewangles[PITCH] += aspeed * cl_pitchspeed->value;
		else if (joysticky > joyyh)
			cl.viewangles[PITCH] -= aspeed * cl_pitchspeed->value;
	} else {
		if (joysticky < joyyl)
			cmd->forwardmove += speed * cl_forwardspeed->value;
		else if (joysticky > joyyh)
			cmd->forwardmove -= speed * cl_backspeed->value;
	}
}

/*
===========
IN_Move
===========
*/
void
IN_Move (void)
{
	IN_MouseMove ();
	IN_JoyMove ();
	IN_ExternalMove (cmd);
}

/* 
============================================================================ 
 
					JOYSTICK 
 
============================================================================ 
*/



qboolean
IN_ReadJoystick (void)
{
	int         b;
	int         count;

	joystickx = 0;
	joysticky = 0;

	count = 0;

	b = dos_inportb (0x201);
	dos_outportb (0x201, b);

// clear counters
	while (++count < 10000) {
		b = dos_inportb (0x201);

		joystickx += b & 1;
		joysticky += (b & 2) >> 1;
		if (!(b & 3))
			return true;
	}

	Con_Printf ("IN_ReadJoystick: no response\n");
	joy_avail = false;
	return false;
}

/*
=============
WaitJoyButton
=============
*/
qboolean
WaitJoyButton (void)
{
	int         oldbuttons, buttons;

	oldbuttons = 0;
	do {
		key_count = -1;
		IN_SendKeyEvents ();
		key_count = 0;
		if (key_lastpress == K_ESCAPE) {
			Con_Printf ("aborted.\n");
			return false;
		}
		key_lastpress = 0;
		SCR_UpdateScreen ();
		buttons = ((dos_inportb (0x201) >> 4) & 1) ^ 1;
		if (buttons != oldbuttons) {
			oldbuttons = buttons;
			continue;
		}
	} while (!buttons);

	do {
		key_count = -1;
		IN_SendKeyEvents ();
		key_count = 0;
		if (key_lastpress == K_ESCAPE) {
			Con_Printf ("aborted.\n");
			return false;
		}
		key_lastpress = 0;
		SCR_UpdateScreen ();
		buttons = ((dos_inportb (0x201) >> 4) & 1) ^ 1;
		if (buttons != oldbuttons) {
			oldbuttons = buttons;
			continue;
		}
	} while (buttons);

	return true;
}



/* 
=============== 
IN_StartupJoystick 
=============== 
*/
void
IN_StartupJoystick (void)
{
	int         centerx, centery;

	Con_Printf ("\n");

	joy_avail = false;
	if (COM_CheckParm ("-nojoy"))
		return;

	if (!IN_ReadJoystick ()) {
		joy_avail = false;
		Con_Printf ("joystick not found\n");
		return;
	}

	Con_Printf ("joystick found\n");

	Con_Printf ("CENTER the joystick\nand press button 1 (ESC to skip):\n");
	if (!WaitJoyButton ())
		return;
	IN_ReadJoystick ();
	centerx = joystickx;
	centery = joysticky;

	Con_Printf
		("Push the joystick to the UPPER LEFT\nand press button 1 (ESC to skip):\n");
	if (!WaitJoyButton ())
		return;
	IN_ReadJoystick ();
	joyxl = (centerx + joystickx) / 2;
	joyyl = (centerx + joysticky) / 2;

	Con_Printf
		("Push the joystick to the LOWER RIGHT\nand press button 1 (ESC to skip):\n");
	if (!WaitJoyButton ())
		return;
	IN_ReadJoystick ();
	joyxh = (centerx + joystickx) / 2;
	joyyh = (centery + joysticky) / 2;

	joy_avail = true;
	Con_Printf ("joystick configured.\n");

	Con_Printf ("\n");
}


/* 
============================================================================ 
 
					EXTERNAL 
 
============================================================================ 
*/


/* 
=============== 
IN_StartupExternal 
=============== 
*/
void
IN_StartupExternal (void)
{
	if (extern_control->numButtons > 32)
		extern_control->numButtons = 32;

	Con_Printf ("%s Initialized\n", extern_control->deviceName);
	Con_Printf ("  %u axes  %u buttons\n", extern_control->numAxes,
				extern_control->numButtons);

	extern_avail = true;
	extern_buttons = extern_control->numButtons;
}


/*
===========
IN_ExternalMove
===========
*/
void
IN_ExternalMove (usercmd_t *cmd)
{
	qboolean    freelook;

	if (!extern_avail)
		return;

	extern_control->viewangles[YAW] = cl.viewangles[YAW];
	extern_control->viewangles[PITCH] = cl.viewangles[PITCH];
	extern_control->viewangles[ROLL] = cl.viewangles[ROLL];
	extern_control->forwardmove = cmd->forwardmove;
	extern_control->sidemove = cmd->sidemove;
	extern_control->upmove = cmd->upmove;

	Con_DPrintf ("IN:  y:%f p:%f r:%f f:%f s:%f u:%f\n",
				 extern_control->viewangles[YAW],
				 extern_control->viewangles[PITCH],
				 extern_control->viewangles[ROLL], extern_control->forwardmove,
				 extern_control->sidemove, extern_control->upmove);

	dos_int86 (extern_control->interruptVector);

	Con_DPrintf ("OUT: y:%f p:%f r:%f f:%f s:%f u:%f\n",
				 extern_control->viewangles[YAW],
				 extern_control->viewangles[PITCH],
				 extern_control->viewangles[ROLL], extern_control->forwardmove,
				 extern_control->sidemove, extern_control->upmove);

	cl.viewangles[YAW] = extern_control->viewangles[YAW];
	cl.viewangles[PITCH] = extern_control->viewangles[PITCH];
	cl.viewangles[ROLL] = extern_control->viewangles[ROLL];
	cmd->forwardmove = extern_control->forwardmove;
	cmd->sidemove = extern_control->sidemove;
	cmd->upmove = extern_control->upmove;

	if (cl.viewangles[PITCH] > 80)
		cl.viewangles[PITCH] = 80;
	if (cl.viewangles[PITCH] < -70)
		cl.viewangles[PITCH] = -70;

	freelook = (extern_control->flags & AUX_FLAG_FREELOOK || aux_look->int_val
				|| in_mlook.state & 1);

	if (freelook)
		V_StopPitchDrift ();
}

void
IN_HandlePause (qboolean pause)
{
}