/*
 * Copyright (C) 1997-2001 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.
 *
 * =======================================================================
 *
 * Client / Server interactions
 *
 * =======================================================================
 */

#include "../header/common.h"

vec3_t	bytedirs[NUMVERTEXNORMALS] =
{
	{-0.525731, 0.000000, 0.850651},
	{-0.442863, 0.238856, 0.864188},
	{-0.295242, 0.000000, 0.955423},
	{-0.309017, 0.500000, 0.809017},
	{-0.162460, 0.262866, 0.951056},
	{0.000000, 0.000000, 1.000000},
	{0.000000, 0.850651, 0.525731},
	{-0.147621, 0.716567, 0.681718},
	{0.147621, 0.716567, 0.681718},
	{0.000000, 0.525731, 0.850651},
	{0.309017, 0.500000, 0.809017},
	{0.525731, 0.000000, 0.850651},
	{0.295242, 0.000000, 0.955423},
	{0.442863, 0.238856, 0.864188},
	{0.162460, 0.262866, 0.951056},
	{-0.681718, 0.147621, 0.716567},
	{-0.809017, 0.309017, 0.500000},
	{-0.587785, 0.425325, 0.688191},
	{-0.850651, 0.525731, 0.000000},
	{-0.864188, 0.442863, 0.238856},
	{-0.716567, 0.681718, 0.147621},
	{-0.688191, 0.587785, 0.425325},
	{-0.500000, 0.809017, 0.309017},
	{-0.238856, 0.864188, 0.442863},
	{-0.425325, 0.688191, 0.587785},
	{-0.716567, 0.681718, -0.147621},
	{-0.500000, 0.809017, -0.309017},
	{-0.525731, 0.850651, 0.000000},
	{0.000000, 0.850651, -0.525731},
	{-0.238856, 0.864188, -0.442863},
	{0.000000, 0.955423, -0.295242},
	{-0.262866, 0.951056, -0.162460},
	{0.000000, 1.000000, 0.000000},
	{0.000000, 0.955423, 0.295242},
	{-0.262866, 0.951056, 0.162460},
	{0.238856, 0.864188, 0.442863},
	{0.262866, 0.951056, 0.162460},
	{0.500000, 0.809017, 0.309017},
	{0.238856, 0.864188, -0.442863},
	{0.262866, 0.951056, -0.162460},
	{0.500000, 0.809017, -0.309017},
	{0.850651, 0.525731, 0.000000},
	{0.716567, 0.681718, 0.147621},
	{0.716567, 0.681718, -0.147621},
	{0.525731, 0.850651, 0.000000},
	{0.425325, 0.688191, 0.587785},
	{0.864188, 0.442863, 0.238856},
	{0.688191, 0.587785, 0.425325},
	{0.809017, 0.309017, 0.500000},
	{0.681718, 0.147621, 0.716567},
	{0.587785, 0.425325, 0.688191},
	{0.955423, 0.295242, 0.000000},
	{1.000000, 0.000000, 0.000000},
	{0.951056, 0.162460, 0.262866},
	{0.850651, -0.525731, 0.000000},
	{0.955423, -0.295242, 0.000000},
	{0.864188, -0.442863, 0.238856},
	{0.951056, -0.162460, 0.262866},
	{0.809017, -0.309017, 0.500000},
	{0.681718, -0.147621, 0.716567},
	{0.850651, 0.000000, 0.525731},
	{0.864188, 0.442863, -0.238856},
	{0.809017, 0.309017, -0.500000},
	{0.951056, 0.162460, -0.262866},
	{0.525731, 0.000000, -0.850651},
	{0.681718, 0.147621, -0.716567},
	{0.681718, -0.147621, -0.716567},
	{0.850651, 0.000000, -0.525731},
	{0.809017, -0.309017, -0.500000},
	{0.864188, -0.442863, -0.238856},
	{0.951056, -0.162460, -0.262866},
	{0.147621, 0.716567, -0.681718},
	{0.309017, 0.500000, -0.809017},
	{0.425325, 0.688191, -0.587785},
	{0.442863, 0.238856, -0.864188},
	{0.587785, 0.425325, -0.688191},
	{0.688191, 0.587785, -0.425325},
	{-0.147621, 0.716567, -0.681718},
	{-0.309017, 0.500000, -0.809017},
	{0.000000, 0.525731, -0.850651},
	{-0.525731, 0.000000, -0.850651},
	{-0.442863, 0.238856, -0.864188},
	{-0.295242, 0.000000, -0.955423},
	{-0.162460, 0.262866, -0.951056},
	{0.000000, 0.000000, -1.000000},
	{0.295242, 0.000000, -0.955423},
	{0.162460, 0.262866, -0.951056},
	{-0.442863, -0.238856, -0.864188},
	{-0.309017, -0.500000, -0.809017},
	{-0.162460, -0.262866, -0.951056},
	{0.000000, -0.850651, -0.525731},
	{-0.147621, -0.716567, -0.681718},
	{0.147621, -0.716567, -0.681718},
	{0.000000, -0.525731, -0.850651},
	{0.309017, -0.500000, -0.809017},
	{0.442863, -0.238856, -0.864188},
	{0.162460, -0.262866, -0.951056},
	{0.238856, -0.864188, -0.442863},
	{0.500000, -0.809017, -0.309017},
	{0.425325, -0.688191, -0.587785},
	{0.716567, -0.681718, -0.147621},
	{0.688191, -0.587785, -0.425325},
	{0.587785, -0.425325, -0.688191},
	{0.000000, -0.955423, -0.295242},
	{0.000000, -1.000000, 0.000000},
	{0.262866, -0.951056, -0.162460},
	{0.000000, -0.850651, 0.525731},
	{0.000000, -0.955423, 0.295242},
	{0.238856, -0.864188, 0.442863},
	{0.262866, -0.951056, 0.162460},
	{0.500000, -0.809017, 0.309017},
	{0.716567, -0.681718, 0.147621},
	{0.525731, -0.850651, 0.000000},
	{-0.238856, -0.864188, -0.442863},
	{-0.500000, -0.809017, -0.309017},
	{-0.262866, -0.951056, -0.162460},
	{-0.850651, -0.525731, 0.000000},
	{-0.716567, -0.681718, -0.147621},
	{-0.716567, -0.681718, 0.147621},
	{-0.525731, -0.850651, 0.000000},
	{-0.500000, -0.809017, 0.309017},
	{-0.238856, -0.864188, 0.442863},
	{-0.262866, -0.951056, 0.162460},
	{-0.864188, -0.442863, 0.238856},
	{-0.809017, -0.309017, 0.500000},
	{-0.688191, -0.587785, 0.425325},
	{-0.681718, -0.147621, 0.716567},
	{-0.442863, -0.238856, 0.864188},
	{-0.587785, -0.425325, 0.688191},
	{-0.309017, -0.500000, 0.809017},
	{-0.147621, -0.716567, 0.681718},
	{-0.425325, -0.688191, 0.587785},
	{-0.162460, -0.262866, 0.951056},
	{0.442863, -0.238856, 0.864188},
	{0.162460, -0.262866, 0.951056},
	{0.309017, -0.500000, 0.809017},
	{0.147621, -0.716567, 0.681718},
	{0.000000, -0.525731, 0.850651},
	{0.425325, -0.688191, 0.587785},
	{0.587785, -0.425325, 0.688191},
	{0.688191, -0.587785, 0.425325},
	{-0.955423, 0.295242, 0.000000},
	{-0.951056, 0.162460, 0.262866},
	{-1.000000, 0.000000, 0.000000},
	{-0.850651, 0.000000, 0.525731},
	{-0.955423, -0.295242, 0.000000},
	{-0.951056, -0.162460, 0.262866},
	{-0.864188, 0.442863, -0.238856},
	{-0.951056, 0.162460, -0.262866},
	{-0.809017, 0.309017, -0.500000},
	{-0.864188, -0.442863, -0.238856},
	{-0.951056, -0.162460, -0.262866},
	{-0.809017, -0.309017, -0.500000},
	{-0.681718, 0.147621, -0.716567},
	{-0.681718, -0.147621, -0.716567},
	{-0.850651, 0.000000, -0.525731},
	{-0.688191, 0.587785, -0.425325},
	{-0.587785, 0.425325, -0.688191},
	{-0.425325, 0.688191, -0.587785},
	{-0.425325, -0.688191, -0.587785},
	{-0.587785, -0.425325, -0.688191},
	{-0.688191, -0.587785, -0.425325}
};

void MSG_WriteChar (sizebuf_t *sb, int c)
{
	byte	*buf;

	buf = SZ_GetSpace (sb, 1);
	buf[0] = c;
}

void MSG_WriteByte (sizebuf_t *sb, int c)
{
	byte	*buf;

	buf = SZ_GetSpace (sb, 1);
	buf[0] = c;
}

void MSG_WriteShort (sizebuf_t *sb, int c)
{
	byte	*buf;

	buf = SZ_GetSpace (sb, 2);
	buf[0] = c&0xff;
	buf[1] = c>>8;
}

void MSG_WriteLong (sizebuf_t *sb, int c)
{
	byte	*buf;

	buf = SZ_GetSpace (sb, 4);
	buf[0] = c&0xff;
	buf[1] = (c>>8)&0xff;
	buf[2] = (c>>16)&0xff;
	buf[3] = c>>24;
}

void MSG_WriteFloat (sizebuf_t *sb, float f)
{
	union
	{
		float	f;
		int	l;
	} dat;


	dat.f = f;
	dat.l = LittleLong (dat.l);

	SZ_Write (sb, &dat.l, 4);
}

void MSG_WriteString (sizebuf_t *sb, char *s)
{
	if (!s)
		SZ_Write (sb, "", 1);

	else
		SZ_Write (sb, s, (int)strlen(s)+1);
}

void MSG_WriteCoord (sizebuf_t *sb, float f)
{
	MSG_WriteShort (sb, (int)(f*8));
}

void MSG_WritePos (sizebuf_t *sb, vec3_t pos)
{
	MSG_WriteShort (sb, (int)(pos[0]*8));
	MSG_WriteShort (sb, (int)(pos[1]*8));
	MSG_WriteShort (sb, (int)(pos[2]*8));
}

void MSG_WriteAngle (sizebuf_t *sb, float f)
{
	MSG_WriteByte (sb, (int)(f*256/360) & 255);
}

void MSG_WriteAngle16 (sizebuf_t *sb, float f)
{
	MSG_WriteShort (sb, ANGLE2SHORT(f));
}

void MSG_WriteDeltaUsercmd (sizebuf_t *buf, usercmd_t *from, usercmd_t *cmd)
{
	int		bits;

	/* Movement messages */
	bits = 0;

	if (cmd->angles[0] != from->angles[0])
		bits |= CM_ANGLE1;

	if (cmd->angles[1] != from->angles[1])
		bits |= CM_ANGLE2;

	if (cmd->angles[2] != from->angles[2])
		bits |= CM_ANGLE3;

	if (cmd->forwardmove != from->forwardmove)
		bits |= CM_FORWARD;

	if (cmd->sidemove != from->sidemove)
		bits |= CM_SIDE;

	if (cmd->upmove != from->upmove)
		bits |= CM_UP;

	if (cmd->buttons != from->buttons)
		bits |= CM_BUTTONS;

	if (cmd->impulse != from->impulse)
		bits |= CM_IMPULSE;

	MSG_WriteByte (buf, bits);

	if (bits & CM_ANGLE1)
		MSG_WriteShort (buf, cmd->angles[0]);

	if (bits & CM_ANGLE2)
		MSG_WriteShort (buf, cmd->angles[1]);

	if (bits & CM_ANGLE3)
		MSG_WriteShort (buf, cmd->angles[2]);

	if (bits & CM_FORWARD)
		MSG_WriteShort (buf, cmd->forwardmove);

	if (bits & CM_SIDE)
		MSG_WriteShort (buf, cmd->sidemove);

	if (bits & CM_UP)
		MSG_WriteShort (buf, cmd->upmove);

	if (bits & CM_BUTTONS)
		MSG_WriteByte (buf, cmd->buttons);

	if (bits & CM_IMPULSE)
		MSG_WriteByte (buf, cmd->impulse);

	MSG_WriteByte (buf, cmd->msec);
	MSG_WriteByte (buf, cmd->lightlevel);
}

void MSG_WriteDir (sizebuf_t *sb, vec3_t dir)
{
	int		i, best;
	float	d, bestd;

	if (!dir)
	{
		MSG_WriteByte (sb, 0);
		return;
	}

	bestd = 0;
	best = 0;

	for (i=0 ; i<NUMVERTEXNORMALS ; i++)
	{
		d = DotProduct (dir, bytedirs[i]);

		if (d > bestd)
		{
			bestd = d;
			best = i;
		}
	}

	MSG_WriteByte (sb, best);
}

void MSG_ReadDir (sizebuf_t *sb, vec3_t dir)
{
	int		b;

	b = MSG_ReadByte (sb);

	if (b >= NUMVERTEXNORMALS)
		Com_Error (ERR_DROP, "MSF_ReadDir: out of range");

	VectorCopy (bytedirs[b], dir);
}

/*
 * Writes part of a packetentities message.
 * Can delta from either a baseline or a previous packet_entity
 */
void MSG_WriteDeltaEntity (entity_state_t *from, entity_state_t *to, sizebuf_t *msg, qboolean force, qboolean newentity)
{
	int		bits;

	if (!to->number)
		Com_Error (ERR_FATAL, "Unset entity number");

	if (to->number >= MAX_EDICTS)
		Com_Error (ERR_FATAL, "Entity number >= MAX_EDICTS");

	/* send an update */
	bits = 0;

	if (to->number >= 256)
		bits |= U_NUMBER16; /* number8 is implicit otherwise */

	if (to->origin[0] != from->origin[0])
		bits |= U_ORIGIN1;

	if (to->origin[1] != from->origin[1])
		bits |= U_ORIGIN2;

	if (to->origin[2] != from->origin[2])
		bits |= U_ORIGIN3;

	if ( to->angles[0] != from->angles[0] )
		bits |= U_ANGLE1;

	if ( to->angles[1] != from->angles[1] )
		bits |= U_ANGLE2;

	if ( to->angles[2] != from->angles[2] )
		bits |= U_ANGLE3;

	if ( to->skinnum != from->skinnum )
	{
		if ((unsigned)to->skinnum < 256)
			bits |= U_SKIN8;

		else if ((unsigned)to->skinnum < 0x10000)
			bits |= U_SKIN16;

		else
			bits |= (U_SKIN8|U_SKIN16);
	}

	if ( to->frame != from->frame )
	{
		if (to->frame < 256)
			bits |= U_FRAME8;

		else
			bits |= U_FRAME16;
	}

	if ( to->effects != from->effects )
	{
		if (to->effects < 256)
			bits |= U_EFFECTS8;

		else if (to->effects < 0x8000)
			bits |= U_EFFECTS16;

		else
			bits |= U_EFFECTS8|U_EFFECTS16;
	}

	if ( to->renderfx != from->renderfx )
	{
		if (to->renderfx < 256)
			bits |= U_RENDERFX8;

		else if (to->renderfx < 0x8000)
			bits |= U_RENDERFX16;

		else
			bits |= U_RENDERFX8|U_RENDERFX16;
	}

	if ( to->solid != from->solid )
		bits |= U_SOLID;

	/* event is not delta compressed, just 0 compressed */
	if ( to->event  )
		bits |= U_EVENT;

	if ( to->modelindex != from->modelindex )
		bits |= U_MODEL;

	if ( to->modelindex2 != from->modelindex2 )
		bits |= U_MODEL2;

	if ( to->modelindex3 != from->modelindex3 )
		bits |= U_MODEL3;

	if ( to->modelindex4 != from->modelindex4 )
		bits |= U_MODEL4;

	if ( to->sound != from->sound )
		bits |= U_SOUND;

	if (newentity || (to->renderfx & RF_BEAM))
		bits |= U_OLDORIGIN;

	/* write the message */
	if (!bits && !force)
		return; /* nothing to send! */

	if (bits & 0xff000000)
		bits |= U_MOREBITS3 | U_MOREBITS2 | U_MOREBITS1;

	else if (bits & 0x00ff0000)
		bits |= U_MOREBITS2 | U_MOREBITS1;

	else if (bits & 0x0000ff00)
		bits |= U_MOREBITS1;

	MSG_WriteByte (msg,	bits&255 );

	if (bits & 0xff000000)
	{
		MSG_WriteByte (msg,	(bits>>8)&255 );
		MSG_WriteByte (msg,	(bits>>16)&255 );
		MSG_WriteByte (msg,	(bits>>24)&255 );
	}

	else if (bits & 0x00ff0000)
	{
		MSG_WriteByte (msg,	(bits>>8)&255 );
		MSG_WriteByte (msg,	(bits>>16)&255 );
	}

	else if (bits & 0x0000ff00)
	{
		MSG_WriteByte (msg,	(bits>>8)&255 );
	}

	if (bits & U_NUMBER16)
		MSG_WriteShort (msg, to->number);

	else
		MSG_WriteByte (msg,	to->number);

	if (bits & U_MODEL)
		MSG_WriteByte (msg,	to->modelindex);

	if (bits & U_MODEL2)
		MSG_WriteByte (msg,	to->modelindex2);

	if (bits & U_MODEL3)
		MSG_WriteByte (msg,	to->modelindex3);

	if (bits & U_MODEL4)
		MSG_WriteByte (msg,	to->modelindex4);

	if (bits & U_FRAME8)
		MSG_WriteByte (msg, to->frame);

	if (bits & U_FRAME16)
		MSG_WriteShort (msg, to->frame);

	if ((bits & U_SKIN8) && (bits & U_SKIN16)) /*used for laser colors */
		MSG_WriteLong (msg, to->skinnum);

	else if (bits & U_SKIN8)
		MSG_WriteByte (msg, to->skinnum);

	else if (bits & U_SKIN16)
		MSG_WriteShort (msg, to->skinnum);

	if ( (bits & (U_EFFECTS8|U_EFFECTS16)) == (U_EFFECTS8|U_EFFECTS16) )
		MSG_WriteLong (msg, to->effects);

	else if (bits & U_EFFECTS8)
		MSG_WriteByte (msg, to->effects);

	else if (bits & U_EFFECTS16)
		MSG_WriteShort (msg, to->effects);

	if ( (bits & (U_RENDERFX8|U_RENDERFX16)) == (U_RENDERFX8|U_RENDERFX16) )
		MSG_WriteLong (msg, to->renderfx);

	else if (bits & U_RENDERFX8)
		MSG_WriteByte (msg, to->renderfx);

	else if (bits & U_RENDERFX16)
		MSG_WriteShort (msg, to->renderfx);

	if (bits & U_ORIGIN1)
		MSG_WriteCoord (msg, to->origin[0]);

	if (bits & U_ORIGIN2)
		MSG_WriteCoord (msg, to->origin[1]);

	if (bits & U_ORIGIN3)
		MSG_WriteCoord (msg, to->origin[2]);

	if (bits & U_ANGLE1)
		MSG_WriteAngle(msg, to->angles[0]);

	if (bits & U_ANGLE2)
		MSG_WriteAngle(msg, to->angles[1]);

	if (bits & U_ANGLE3)
		MSG_WriteAngle(msg, to->angles[2]);

	if (bits & U_OLDORIGIN)
	{
		MSG_WriteCoord (msg, to->old_origin[0]);
		MSG_WriteCoord (msg, to->old_origin[1]);
		MSG_WriteCoord (msg, to->old_origin[2]);
	}

	if (bits & U_SOUND)
		MSG_WriteByte (msg, to->sound);

	if (bits & U_EVENT)
		MSG_WriteByte (msg, to->event);

	if (bits & U_SOLID)
		MSG_WriteShort (msg, to->solid);
}