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

*/
// cl.input.c  -- builds an intended movement command to send to the server

#include "quakedef.h"

cvar_t	cl_nodelta = CVAR2("cl_nodelta","0");

/*
===============================================================================

KEY BUTTONS

Continuous button event tracking is complicated by the fact that two different
input sources (say, mouse button 1 and the control key) can both press the
same button, but the button should only be released when both of the
pressing key have been released.

When a key event issues a button command (+forward, +attack, etc), it appends
its key number as a parameter to the command so it can be matched up with
the release.

state bit 0 is the current state of the key
state bit 1 is edge triggered on the up to down transition
state bit 2 is edge triggered on the down to up transition

===============================================================================
*/


kbutton_t	in_mlook, in_klook;
kbutton_t	in_left, in_right, in_forward, in_back;
kbutton_t	in_lookup, in_lookdown, in_moveleft, in_moveright;
kbutton_t	in_strafe, in_speed, in_use, in_jump, in_attack;
kbutton_t	in_up, in_down;

int			in_impulse;


void KeyDown (kbutton_t *b)
{
	int		k;
	char	*c;
	
	c = Cmd_Argv(1);
	if (c[0])
		k = atoi(c);
	else
		k = -1;		// typed manually at the console for continuous down

	if (k == b->down[0] || k == b->down[1])
		return;		// repeating key
	
	if (!b->down[0])
		b->down[0] = k;
	else if (!b->down[1])
		b->down[1] = k;
	else
	{
		Con_Printf ("Three keys down for a button!\n");
		return;
	}
	
	if (b->state & 1)
		return;		// still down
	b->state |= 1 + 2;	// down + impulse down
}

void KeyUp (kbutton_t *b)
{
	int		k;
	char	*c;
	
	c = Cmd_Argv(1);
	if (c[0])
		k = atoi(c);
	else
	{ // typed manually at the console, assume for unsticking, so clear all
		b->down[0] = b->down[1] = 0;
		b->state = 4;	// impulse up
		return;
	}

	if (b->down[0] == k)
		b->down[0] = 0;
	else if (b->down[1] == k)
		b->down[1] = 0;
	else
		return;		// key up without coresponding down (menu pass through)
	if (b->down[0] || b->down[1])
		return;		// some other key is still holding it down

	if (!(b->state & 1))
		return;		// still up (this should not happen)
	b->state &= ~1;		// now up
	b->state |= 4; 		// impulse up
}

void IN_KLookDown (void) {KeyDown(&in_klook);}
void IN_KLookUp (void) {KeyUp(&in_klook);}
void IN_MLookDown (void) {KeyDown(&in_mlook);}
void IN_MLookUp (void) {
KeyUp(&in_mlook);
if ( !(in_mlook.state&1) &&  lookspring.value)
	V_StartPitchDrift();
}
void IN_UpDown(void) {KeyDown(&in_up);}
void IN_UpUp(void) {KeyUp(&in_up);}
void IN_DownDown(void) {KeyDown(&in_down);}
void IN_DownUp(void) {KeyUp(&in_down);}
void IN_LeftDown(void) {KeyDown(&in_left);}
void IN_LeftUp(void) {KeyUp(&in_left);}
void IN_RightDown(void) {KeyDown(&in_right);}
void IN_RightUp(void) {KeyUp(&in_right);}
void IN_ForwardDown(void) {KeyDown(&in_forward);}
void IN_ForwardUp(void) {KeyUp(&in_forward);}
void IN_BackDown(void) {KeyDown(&in_back);}
void IN_BackUp(void) {KeyUp(&in_back);}
void IN_LookupDown(void) {KeyDown(&in_lookup);}
void IN_LookupUp(void) {KeyUp(&in_lookup);}
void IN_LookdownDown(void) {KeyDown(&in_lookdown);}
void IN_LookdownUp(void) {KeyUp(&in_lookdown);}
void IN_MoveleftDown(void) {KeyDown(&in_moveleft);}
void IN_MoveleftUp(void) {KeyUp(&in_moveleft);}
void IN_MoverightDown(void) {KeyDown(&in_moveright);}
void IN_MoverightUp(void) {KeyUp(&in_moveright);}

void IN_SpeedDown(void) {KeyDown(&in_speed);}
void IN_SpeedUp(void) {KeyUp(&in_speed);}
void IN_StrafeDown(void) {KeyDown(&in_strafe);}
void IN_StrafeUp(void) {KeyUp(&in_strafe);}

void IN_AttackDown(void) {KeyDown(&in_attack);}
void IN_AttackUp(void) {KeyUp(&in_attack);}

void IN_UseDown (void) {KeyDown(&in_use);}
void IN_UseUp (void) {KeyUp(&in_use);}
void IN_JumpDown (void) {KeyDown(&in_jump);}
void IN_JumpUp (void) {KeyUp(&in_jump);}

void IN_Impulse (void) {in_impulse=Q_atoi(Cmd_Argv(1));}

/*
===============
CL_KeyState

Returns 0.25 if a key was pressed and released during the frame,
0.5 if it was pressed and held
0 if held then released, and
1.0 if held for the entire time
===============
*/
float CL_KeyState (kbutton_t *key)
{
	float		val;
	qboolean	impulsedown, impulseup, down;
	
	impulsedown = key->state & 2;
	impulseup = key->state & 4;
	down = key->state & 1;
	val = 0;
	
	if (impulsedown && !impulseup) {
		if (down)
			val = 0.5;	// pressed and held this frame
		else
			val = 0;	//	I_Error ();
	}
	if (impulseup && !impulsedown) {
		if (down)
			val = 0;	//	I_Error ();
		else
			val = 0;	// released this frame
	}
	if (!impulsedown && !impulseup) {
		if (down)
			val = 1.0;	// held the entire frame
		else
			val = 0;	// up the entire frame
	}
	if (impulsedown && impulseup) {
		if (down)
			val = 0.75;	// released and re-pressed this frame
		else
			val = 0.25;	// pressed and released this frame
	}
	
	key->state &= 1;		// clear impulses
	
	return val;
}




//==========================================================================

cvar_t	cl_upspeed = CVAR2("cl_upspeed","200");
cvar_t	cl_forwardspeed = CVAR3("cl_forwardspeed","200", true);
cvar_t	cl_backspeed = CVAR3("cl_backspeed","200", true);
cvar_t	cl_sidespeed = CVAR2("cl_sidespeed","350");

cvar_t	cl_movespeedkey = CVAR2("cl_movespeedkey","2.0");

cvar_t	cl_yawspeed = CVAR2("cl_yawspeed","140");
cvar_t	cl_pitchspeed = CVAR2("cl_pitchspeed","150");

cvar_t	cl_anglespeedkey = CVAR2("cl_anglespeedkey","1.5");


/*
================
CL_AdjustAngles

Moves the local angle positions
================
*/
void CL_AdjustAngles (void)
{
	float	speed;
	float	up, down;
	
	if (in_speed.state & 1)
		speed = host_frametime * cl_anglespeedkey.value;
	else
		speed = host_frametime;

	if (!(in_strafe.state & 1))
	{
		cl.viewangles[YAW] -= speed*cl_yawspeed.value*CL_KeyState (&in_right);
		cl.viewangles[YAW] += speed*cl_yawspeed.value*CL_KeyState (&in_left);
		cl.viewangles[YAW] = anglemod(cl.viewangles[YAW]);
	}
	if (in_klook.state & 1)
	{
		V_StopPitchDrift ();
		cl.viewangles[PITCH] -= speed*cl_pitchspeed.value * CL_KeyState (&in_forward);
		cl.viewangles[PITCH] += speed*cl_pitchspeed.value * CL_KeyState (&in_back);
	}
	
	up = CL_KeyState (&in_lookup);
	down = CL_KeyState(&in_lookdown);
	
	cl.viewangles[PITCH] -= speed*cl_pitchspeed.value * up;
	cl.viewangles[PITCH] += speed*cl_pitchspeed.value * down;

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

	if (cl.viewangles[ROLL] > 50)
		cl.viewangles[ROLL] = 50;
	if (cl.viewangles[ROLL] < -50)
		cl.viewangles[ROLL] = -50;
		
}

/*
================
CL_BaseMove

Send the intended movement message to the server
================
*/
void CL_BaseMove (usercmd_t *cmd)
{	
	CL_AdjustAngles ();
	
	memset (cmd, 0, sizeof(*cmd));
	
	VectorCopy (cl.viewangles, cmd->angles);
	if (in_strafe.state & 1)
	{
		cmd->sidemove += cl_sidespeed.value * CL_KeyState (&in_right);
		cmd->sidemove -= cl_sidespeed.value * CL_KeyState (&in_left);
	}

	cmd->sidemove += cl_sidespeed.value * CL_KeyState (&in_moveright);
	cmd->sidemove -= cl_sidespeed.value * CL_KeyState (&in_moveleft);

	cmd->upmove += cl_upspeed.value * CL_KeyState (&in_up);
	cmd->upmove -= cl_upspeed.value * CL_KeyState (&in_down);

	if (! (in_klook.state & 1) )
	{	
		cmd->forwardmove += cl_forwardspeed.value * CL_KeyState (&in_forward);
		cmd->forwardmove -= cl_backspeed.value * CL_KeyState (&in_back);
	}	

//
// adjust for speed key
//
	if (in_speed.state & 1)
	{
		cmd->forwardmove *= cl_movespeedkey.value;
		cmd->sidemove *= cl_movespeedkey.value;
		cmd->upmove *= cl_movespeedkey.value;
	}	
}

int MakeChar (int i)
{
	i &= ~3;
	if (i < -127*4)
		i = -127*4;
	if (i > 127*4)
		i = 127*4;
	return i;
}

/*
==============
CL_FinishMove
==============
*/
void CL_FinishMove (usercmd_t *cmd)
{
	int		i;
	int		ms;

//
// allways dump the first two message, because it may contain leftover inputs
// from the last level
//
	if (++cl.movemessages <= 2)
		return;
//
// figure button bits
//	
	if ( in_attack.state & 3 )
		cmd->buttons |= 1;
	in_attack.state &= ~2;
	
	if (in_jump.state & 3)
		cmd->buttons |= 2;
	in_jump.state &= ~2;

	// send milliseconds of time to apply the move
	ms = host_frametime * 1000;
	if (ms > 250)
		ms = 100;		// time was unreasonable
	cmd->msec = ms;

	VectorCopy (cl.viewangles, cmd->angles);

	cmd->impulse = in_impulse;
	in_impulse = 0;


//
// chop down so no extra bits are kept that the server wouldn't get
//
	cmd->forwardmove = MakeChar (cmd->forwardmove);
	cmd->sidemove = MakeChar (cmd->sidemove);
	cmd->upmove = MakeChar (cmd->upmove);

	for (i=0 ; i<3 ; i++)
		cmd->angles[i] = ((int)(cmd->angles[i]*65536.0/360)&65535) * (360.0/65536.0);
}

/*
=================
CL_SendCmd
=================
*/
void CL_SendCmd (void)
{
	sizebuf_t	buf;
	byte		data[128];
	int			i;
	usercmd_t	*cmd, *oldcmd;
	int			checksumIndex;
	int			lost;
	int			seq_hash;

	if (cls.demoplayback)
		return; // sendcmds come from the demo

	// save this command off for prediction
	i = cls.netchan.outgoing_sequence & UPDATE_MASK;
	cmd = &cl.frames[i].cmd;
	cl.frames[i].senttime = realtime;
	cl.frames[i].receivedtime = -1;		// we haven't gotten a reply yet

//	seq_hash = (cls.netchan.outgoing_sequence & 0xffff) ; // ^ QW_CHECK_HASH;
	seq_hash = cls.netchan.outgoing_sequence;

	// get basic movement from keyboard
	CL_BaseMove (cmd);

	// allow mice or other external controllers to add to the move
	IN_Move (cmd);

	// if we are spectator, try autocam
	if (cl.spectator)
		Cam_Track(cmd);

	CL_FinishMove(cmd);

	Cam_FinishMove(cmd);

// send this and the previous cmds in the message, so
// if the last packet was dropped, it can be recovered
	buf.maxsize = 128;
	buf.cursize = 0;
	buf.data = data;

	MSG_WriteByte (&buf, clc_move);

	// save the position for a checksum byte
	checksumIndex = buf.cursize;
	MSG_WriteByte (&buf, 0);

	// write our lossage percentage
	lost = CL_CalcNet();
	MSG_WriteByte (&buf, (byte)lost);

	i = (cls.netchan.outgoing_sequence-2) & UPDATE_MASK;
	cmd = &cl.frames[i].cmd;
	MSG_WriteDeltaUsercmd (&buf, &nullcmd, cmd);
	oldcmd = cmd;

	i = (cls.netchan.outgoing_sequence-1) & UPDATE_MASK;
	cmd = &cl.frames[i].cmd;
	MSG_WriteDeltaUsercmd (&buf, oldcmd, cmd);
	oldcmd = cmd;

	i = (cls.netchan.outgoing_sequence) & UPDATE_MASK;
	cmd = &cl.frames[i].cmd;
	MSG_WriteDeltaUsercmd (&buf, oldcmd, cmd);

	// calculate a checksum over the move commands
	buf.data[checksumIndex] = COM_BlockSequenceCRCByte(
		buf.data + checksumIndex + 1, buf.cursize - checksumIndex - 1,
		seq_hash);

	// request delta compression of entities
	if (cls.netchan.outgoing_sequence - cl.validsequence >= UPDATE_BACKUP-1)
		cl.validsequence = 0;

	if (cl.validsequence && !cl_nodelta.value && cls.state == ca_active &&
		!cls.demorecording)
	{
		cl.frames[cls.netchan.outgoing_sequence&UPDATE_MASK].delta_sequence = cl.validsequence;
		MSG_WriteByte (&buf, clc_delta);
		MSG_WriteByte (&buf, cl.validsequence&255);
	}
	else
		cl.frames[cls.netchan.outgoing_sequence&UPDATE_MASK].delta_sequence = -1;

	if (cls.demorecording)
		CL_WriteDemoCmd(cmd);

//
// deliver the message
//
	Netchan_Transmit (&cls.netchan, buf.cursize, buf.data);	
}



/*
============
CL_InitInput
============
*/
void CL_InitInput (void)
{
	Cmd_AddCommand ("+moveup",IN_UpDown);
	Cmd_AddCommand ("-moveup",IN_UpUp);
	Cmd_AddCommand ("+movedown",IN_DownDown);
	Cmd_AddCommand ("-movedown",IN_DownUp);
	Cmd_AddCommand ("+left",IN_LeftDown);
	Cmd_AddCommand ("-left",IN_LeftUp);
	Cmd_AddCommand ("+right",IN_RightDown);
	Cmd_AddCommand ("-right",IN_RightUp);
	Cmd_AddCommand ("+forward",IN_ForwardDown);
	Cmd_AddCommand ("-forward",IN_ForwardUp);
	Cmd_AddCommand ("+back",IN_BackDown);
	Cmd_AddCommand ("-back",IN_BackUp);
	Cmd_AddCommand ("+lookup", IN_LookupDown);
	Cmd_AddCommand ("-lookup", IN_LookupUp);
	Cmd_AddCommand ("+lookdown", IN_LookdownDown);
	Cmd_AddCommand ("-lookdown", IN_LookdownUp);
	Cmd_AddCommand ("+strafe", IN_StrafeDown);
	Cmd_AddCommand ("-strafe", IN_StrafeUp);
	Cmd_AddCommand ("+moveleft", IN_MoveleftDown);
	Cmd_AddCommand ("-moveleft", IN_MoveleftUp);
	Cmd_AddCommand ("+moveright", IN_MoverightDown);
	Cmd_AddCommand ("-moveright", IN_MoverightUp);
	Cmd_AddCommand ("+speed", IN_SpeedDown);
	Cmd_AddCommand ("-speed", IN_SpeedUp);
	Cmd_AddCommand ("+attack", IN_AttackDown);
	Cmd_AddCommand ("-attack", IN_AttackUp);
	Cmd_AddCommand ("+use", IN_UseDown);
	Cmd_AddCommand ("-use", IN_UseUp);
	Cmd_AddCommand ("+jump", IN_JumpDown);
	Cmd_AddCommand ("-jump", IN_JumpUp);
	Cmd_AddCommand ("impulse", IN_Impulse);
	Cmd_AddCommand ("+klook", IN_KLookDown);
	Cmd_AddCommand ("-klook", IN_KLookUp);
	Cmd_AddCommand ("+mlook", IN_MLookDown);
	Cmd_AddCommand ("-mlook", IN_MLookUp);

	Cvar_RegisterVariable (&cl_nodelta);
}

/*
============
CL_ClearStates
============
*/
void CL_ClearStates (void)
{
}

