/*
Copyright (C) 1996-1997 Id Software, Inc.
Portions Copyright (C) 1999,2000  Nelson Rush.
Copyright (C) 1999,2000  contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors

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 included (GNU.txt) 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"
#include "pmove_simple.h"
#include "qtypes.h"
#include "client.h"
#include "console.h"

void CL_FinishTimeDemo (void);

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

DEMO CODE

When a demo is playing back, all NET_SendMessages are skipped, and
NET_GetMessages are read from the demo file.

Whenever cl.time gets past the last received message, another message is
read from the demo file.
==============================================================================
*/

/*
==============
CL_StopPlayback

Called when a demo file runs out, or the user starts a game
==============
*/
void CL_StopPlayback (void)
{
	if (!cls.demoplayback)
		return;

	gzclose (cls.demofile);
	cls.demofile = NULL;
	cls.state = ca_disconnected;
	cls.demoplayback = 0;

	if (cls.timedemo)
		CL_FinishTimeDemo ();
}

#define dem_cmd		0
#define dem_read	1
#define dem_set		2

/*
====================
CL_WriteDemoCmd

Writes the current user cmd
====================
*/
void CL_WriteDemoCmd (usercmd_t *pcmd)
{
	int		i;
	float	fl;
	byte	c;
	usercmd_t cmd;

//Con_Printf("write: %ld bytes, %4.4f\n", msg->cursize, realtime);

	fl = LittleFloat((float)realtime);
	gzwrite (cls.demofile, &fl, sizeof(fl));

	c = dem_cmd;
	gzwrite (cls.demofile, &c, sizeof(c));

	// correct for byte order, bytes don't matter
	cmd = *pcmd;

	for (i = 0; i < 3; i++)
		cmd.angles[i] = LittleFloat(cmd.angles[i]);
	cmd.forwardmove = LittleShort(cmd.forwardmove);
	cmd.sidemove    = LittleShort(cmd.sidemove);
	cmd.upmove      = LittleShort(cmd.upmove);

	gzwrite(cls.demofile, &cmd, sizeof(cmd));

	for (i=0 ; i<3 ; i++)
	{
		fl = LittleFloat (cl.viewangles[i]);
		gzwrite (cls.demofile, &fl, 4);
	}

	gzflush (cls.demofile, Z_SYNC_FLUSH);
}

/*
====================
CL_WriteDemoMessage

Dumps the current net message, prefixed by the length and view angles
====================
*/
void CL_WriteDemoMessage (sizebuf_t *msg)
{
	int		len;
	float	fl;
	byte	c;

//Con_Printf("write: %ld bytes, %4.4f\n", msg->cursize, realtime);

	if (!cls.demorecording)
		return;

	fl = LittleFloat((float)realtime);
	gzwrite (cls.demofile, &fl, sizeof(fl));

	c = dem_read;
	gzwrite (cls.demofile, &c, sizeof(c));

	len = LittleLong (msg->cursize);
	gzwrite (cls.demofile, &len, 4);
	gzwrite (cls.demofile, msg->data, msg->cursize);

	gzflush (cls.demofile, Z_SYNC_FLUSH);
}

/*
====================
CL_GetDemoMessage

  FIXME...
====================
*/
qboolean CL_GetDemoMessage (void)
{
	int		r, i, j;
	float	f;
	float	demotime;
	byte	c;
	usercmd_t *pcmd;

	// read the time from the packet
	gzread(cls.demofile, &demotime, sizeof(demotime));
	demotime = LittleFloat(demotime);

// decide if it is time to grab the next message		
	if (cls.timedemo) {
		if (cls.td_lastframe < 0)
			cls.td_lastframe = demotime;
		else if (demotime > cls.td_lastframe) {
			cls.td_lastframe = demotime;
			// rewind back to time
			gzseek(cls.demofile, gztell(cls.demofile) - sizeof(demotime),
					SEEK_SET);
			return 0;		// allready read this frame's message
		}
		if (!cls.td_starttime && cls.state == ca_active) {
			cls.td_starttime = Sys_DoubleTime();
			cls.td_startframe = host_framecount;
		}
		realtime = demotime; // warp
	} else if (!cl.paused && cls.state >= ca_onserver) {	// allways grab until fully connected
		if (realtime + 1.0 < demotime) {
			// too far back
			realtime = demotime - 1.0;
			// rewind back to time
			gzseek(cls.demofile, gztell(cls.demofile) - sizeof(demotime),
					SEEK_SET);
			return 0;
		} else if (realtime < demotime) {
			// rewind back to time
			gzseek(cls.demofile, gztell(cls.demofile) - sizeof(demotime),
					SEEK_SET);
			return 0;		// don't need another message yet
		}
	} else
		realtime = demotime; // we're warping

	if (cls.state < ca_demostart)
		Host_Error ("CL_GetDemoMessage: cls.state != ca_active");
	
	// get the msg type
	gzread (cls.demofile, &c, sizeof(c));
	
	switch (c) {
	case dem_cmd :
		// user sent input
		i = cls.netchan.outgoing_sequence & UPDATE_MASK;
		pcmd = &cl.frames[i].cmd;
		r = gzread (cls.demofile, pcmd, sizeof(*pcmd));
		if (r != sizeof(*pcmd))
		{
			CL_StopPlayback ();
			return 0;
		}
		// byte order stuff
		for (j = 0; j < 3; j++)
			pcmd->angles[j] = LittleFloat(pcmd->angles[j]);
		pcmd->forwardmove = LittleShort(pcmd->forwardmove);
		pcmd->sidemove    = LittleShort(pcmd->sidemove);
		pcmd->upmove      = LittleShort(pcmd->upmove);
		cl.frames[i].senttime = demotime;
		cl.frames[i].receivedtime = -1;		// we haven't gotten a reply yet
		cls.netchan.outgoing_sequence++;
		for (i=0 ; i<3 ; i++)
		{
			r = gzread (cls.demofile, &f, 4);
			cl.viewangles[i] = LittleFloat (f);
		}
		break;

	case dem_read:
		// get the next message
		gzread (cls.demofile, &net_message.cursize, 4);
		net_message.cursize = LittleLong (net_message.cursize);
	//Con_Printf("read: %ld bytes\n", net_message.cursize);
		if (net_message.cursize > MAX_MSGLEN)
			Sys_Error ("Demo message > MAX_MSGLEN");
		r = gzread (cls.demofile, net_message.data, net_message.cursize);
		if (r != net_message.cursize)
		{
			CL_StopPlayback ();
			return 0;
		}
		break;

	case dem_set :
		gzread (cls.demofile, &i, 4);
		cls.netchan.outgoing_sequence = LittleLong(i);
		gzread (cls.demofile, &i, 4);
		cls.netchan.incoming_sequence = LittleLong(i);
		break;

	default :
		Con_Printf("Corrupted demo.\n");
		CL_StopPlayback ();
		return 0;
	}

	return 1;
}

/*
====================
CL_GetMessage

Handles recording and playback of demos, on top of NET_ code
====================
*/
qboolean CL_GetMessage (void)
{
	if	(cls.demoplayback)
		return CL_GetDemoMessage ();

	if (!NET_GetPacket ())
		return false;

	CL_WriteDemoMessage (&net_message);
	
	return true;
}


/*
====================
CL_Stop_f

stop recording a demo
====================
*/
void CL_Stop_f (void)
{
	if (!cls.demorecording)
	{
		Con_Printf ("Not recording a demo.\n");
		return;
	}

// write a disconnect message to the demo file
	SZ_Clear (&net_message);
	MSG_WriteLong (&net_message, -1);	// -1 sequence means out of band
	MSG_WriteByte (&net_message, svc_disconnect);
	MSG_WriteString (&net_message, "EndOfDemo");
	CL_WriteDemoMessage (&net_message);

// finish up
	gzclose (cls.demofile);
	cls.demofile = NULL;
	cls.demorecording = false;
	Con_Printf ("Completed demo\n");
}


/*
====================
CL_WriteDemoMessage

Dumps the current net message, prefixed by the length and view angles
====================
*/
void CL_WriteRecordDemoMessage (sizebuf_t *msg, int seq)
{
	int		len;
	int		i;
	float	fl;
	byte	c;

//Con_Printf("write: %ld bytes, %4.4f\n", msg->cursize, realtime);

	if (!cls.demorecording)
		return;

	fl = LittleFloat((float)realtime);
	gzwrite (cls.demofile, &fl, sizeof(fl));

	c = dem_read;
	gzwrite (cls.demofile, &c, sizeof(c));

	len = LittleLong (msg->cursize + 8);
	gzwrite (cls.demofile, &len, 4);

	i = LittleLong(seq);
	gzwrite (cls.demofile, &i, 4);
	gzwrite (cls.demofile, &i, 4);

	gzwrite (cls.demofile, msg->data, msg->cursize);

	gzflush (cls.demofile, Z_SYNC_FLUSH);
}


void CL_WriteSetDemoMessage (void)
{
	int		len;
	float	fl;
	byte	c;

//Con_Printf("write: %ld bytes, %4.4f\n", msg->cursize, realtime);

	if (!cls.demorecording)
		return;

	fl = LittleFloat((float)realtime);
	gzwrite (cls.demofile, &fl, sizeof(fl));

	c = dem_set;
	gzwrite (cls.demofile, &c, sizeof(c));

	len = LittleLong(cls.netchan.outgoing_sequence);
	gzwrite (cls.demofile, &len, 4);
	len = LittleLong(cls.netchan.incoming_sequence);
	gzwrite (cls.demofile, &len, 4);

	gzflush (cls.demofile, Z_SYNC_FLUSH);
}




/*
====================
CL_Record_f

record <demoname> <server>
====================
*/
void CL_Record_f (void)
{
	int		c;
	char	name[MAX_OSPATH];
	sizebuf_t	buf;
	char	buf_data[MAX_MSGLEN];
	int n, i, j;
	char *s;
	entity_t *ent;
	entity_state_t *es, blankes;
	player_info_t *player;
	extern	char gamedirfile[];
	int seq = 1;

	c = Cmd_Argc();
	if (c != 2)
	{
		Con_Printf ("record <demoname>\n");
		return;
	}

	if (cls.state != ca_active) {
		Con_Printf ("You must be connected to record.\n");
		return;
	}

	if (cls.demorecording)
		CL_Stop_f();
  
	snprintf(name, sizeof(name), "%s/%s", com_gamedir, Cmd_Argv(1));

//
// open the demo file
//
	COM_DefaultExtension (name, ".qwd");

	cls.demofile = gzopen (name, "wb");
	if (!cls.demofile)
	{
		Con_Printf ("ERROR: couldn't open.\n");
		return;
	}

	Con_Printf ("recording to %s.\n", name);
	cls.demorecording = true;

/*-------------------------------------------------*/

// serverdata
	// send the info about the new client to all connected clients
	memset(&buf, 0, sizeof(buf));
	buf.data = buf_data;
	buf.maxsize = sizeof(buf_data);

// send the serverdata
	MSG_WriteByte (&buf, svc_serverdata);
	MSG_WriteLong (&buf, PROTOCOL_VERSION);
	MSG_WriteLong (&buf, cl.servercount);
	MSG_WriteString (&buf, gamedirfile);

	if (cl.spectator)
		MSG_WriteByte (&buf, cl.playernum | 128);
	else
		MSG_WriteByte (&buf, cl.playernum);

	// send full levelname
	MSG_WriteString (&buf, cl.levelname);

	// send the movevars
	MSG_WriteFloat(&buf, movevars.gravity);
	MSG_WriteFloat(&buf, movevars.stopspeed);
	MSG_WriteFloat(&buf, movevars.maxspeed);
	MSG_WriteFloat(&buf, movevars.spectatormaxspeed);
	MSG_WriteFloat(&buf, movevars.accelerate);
	MSG_WriteFloat(&buf, movevars.airaccelerate);
	MSG_WriteFloat(&buf, movevars.wateraccelerate);
	MSG_WriteFloat(&buf, movevars.friction);
	MSG_WriteFloat(&buf, movevars.waterfriction);
	MSG_WriteFloat(&buf, movevars.entgravity);

	// send music
	MSG_WriteByte (&buf, svc_cdtrack);
	MSG_WriteByte (&buf, 0); // none in demos

	// send server info string
	MSG_WriteByte (&buf, svc_stufftext);
	MSG_WriteString (&buf, va("fullserverinfo \"%s\"\n", cl.serverinfo) );

	// flush packet
	CL_WriteRecordDemoMessage (&buf, seq++);
	SZ_Clear (&buf); 

// soundlist
	MSG_WriteByte (&buf, svc_soundlist);
	MSG_WriteByte (&buf, 0);

	n = 0;
	s = cl.sound_name[n+1];
	while (*s) {
		MSG_WriteString (&buf, s);
		if (buf.cursize > MAX_MSGLEN/2) {
			MSG_WriteByte (&buf, 0);
			MSG_WriteByte (&buf, n);
			CL_WriteRecordDemoMessage (&buf, seq++);
			SZ_Clear (&buf); 
			MSG_WriteByte (&buf, svc_soundlist);
			MSG_WriteByte (&buf, n + 1);
		}
		n++;
		s = cl.sound_name[n+1];
	}
	if (buf.cursize) {
		MSG_WriteByte (&buf, 0);
		MSG_WriteByte (&buf, 0);
		CL_WriteRecordDemoMessage (&buf, seq++);
		SZ_Clear (&buf); 
	}

// modellist
	MSG_WriteByte (&buf, svc_modellist);
	MSG_WriteByte (&buf, 0);

	n = 0;
	s = cl.model_name[n+1];
	while (*s) {
		MSG_WriteString (&buf, s);
		if (buf.cursize > MAX_MSGLEN/2) {
			MSG_WriteByte (&buf, 0);
			MSG_WriteByte (&buf, n);
			CL_WriteRecordDemoMessage (&buf, seq++);
			SZ_Clear (&buf); 
			MSG_WriteByte (&buf, svc_modellist);
			MSG_WriteByte (&buf, n + 1);
		}
		n++;
		s = cl.model_name[n+1];
	}
	if (buf.cursize) {
		MSG_WriteByte (&buf, 0);
		MSG_WriteByte (&buf, 0);
		CL_WriteRecordDemoMessage (&buf, seq++);
		SZ_Clear (&buf); 
	}

// spawnstatic

	for (i = 0; i < cl.num_statics; i++) {
		ent = cl_static_entities + i;

		MSG_WriteByte (&buf, svc_spawnstatic);

		for (j = 1; j < MAX_MODELS; j++)
			if (ent->model == cl.model_precache[j])
				break;
		if (j == MAX_MODELS)
			MSG_WriteByte (&buf, 0);
		else
			MSG_WriteByte (&buf, j);

		MSG_WriteByte (&buf, ent->frame);
		MSG_WriteByte (&buf, 0);
		MSG_WriteByte (&buf, ent->skinnum);
		for (j=0 ; j<3 ; j++)
		{
			MSG_WriteCoord (&buf, ent->origin[j]);
			MSG_WriteAngle (&buf, ent->angles[j]);
		}

		if (buf.cursize > MAX_MSGLEN/2) {
			CL_WriteRecordDemoMessage (&buf, seq++);
			SZ_Clear (&buf); 
		}
	}

// spawnstaticsound
	// static sounds are skipped in demos, life is hard

// baselines

	memset(&blankes, 0, sizeof(blankes));
	for (i = 0; i < MAX_EDICTS; i++) {
		es = cl_baselines + i;

		if (memcmp(es, &blankes, sizeof(blankes))) {
			MSG_WriteByte (&buf,svc_spawnbaseline);		
			MSG_WriteShort (&buf, i);

			MSG_WriteByte (&buf, es->modelindex);
			MSG_WriteByte (&buf, es->frame);
			MSG_WriteByte (&buf, es->colormap);
			MSG_WriteByte (&buf, es->skinnum);
			for (j=0 ; j<3 ; j++)
			{
				MSG_WriteCoord(&buf, es->origin[j]);
				MSG_WriteAngle(&buf, es->angles[j]);
			}

			if (buf.cursize > MAX_MSGLEN/2) {
				CL_WriteRecordDemoMessage (&buf, seq++);
				SZ_Clear (&buf); 
			}
		}
	}

	MSG_WriteByte (&buf, svc_stufftext);
	MSG_WriteString (&buf, va("cmd spawn %i 0\n", cl.servercount) );

	if (buf.cursize) {
		CL_WriteRecordDemoMessage (&buf, seq++);
		SZ_Clear (&buf); 
	}

// send current status of all other players

	for (i = 0; i < MAX_CLIENTS; i++) {
		player = cl.players + i;

		MSG_WriteByte (&buf, svc_updatefrags);
		MSG_WriteByte (&buf, i);
		MSG_WriteShort (&buf, player->frags);
		
		MSG_WriteByte (&buf, svc_updateping);
		MSG_WriteByte (&buf, i);
		MSG_WriteShort (&buf, player->ping);
		
		MSG_WriteByte (&buf, svc_updatepl);
		MSG_WriteByte (&buf, i);
		MSG_WriteByte (&buf, player->pl);
		
		MSG_WriteByte (&buf, svc_updateentertime);
		MSG_WriteByte (&buf, i);
		MSG_WriteFloat (&buf, player->entertime);

		MSG_WriteByte (&buf, svc_updateuserinfo);
		MSG_WriteByte (&buf, i);
		MSG_WriteLong (&buf, player->userid);
		MSG_WriteString (&buf, player->userinfo);

		if (buf.cursize > MAX_MSGLEN/2) {
			CL_WriteRecordDemoMessage (&buf, seq++);
			SZ_Clear (&buf); 
		}
	}
	
// send all current light styles
	for (i=0 ; i<MAX_LIGHTSTYLES ; i++)
	{
		MSG_WriteByte (&buf, svc_lightstyle);
		MSG_WriteByte (&buf, (char)i);
		MSG_WriteString (&buf, cl_lightstyle[i].map);
	}

	for (i = 0; i < MAX_CL_STATS; i++) {
		MSG_WriteByte (&buf, svc_updatestatlong);
		MSG_WriteByte (&buf, i);
		MSG_WriteLong (&buf, cl.stats[i]);
		if (buf.cursize > MAX_MSGLEN/2) {
			CL_WriteRecordDemoMessage (&buf, seq++);
			SZ_Clear (&buf); 
		}
	}

#if 0
	MSG_WriteByte (&buf, svc_updatestatlong);
	MSG_WriteByte (&buf, STAT_TOTALMONSTERS);
	MSG_WriteLong (&buf, cl.stats[STAT_TOTALMONSTERS]);

	MSG_WriteByte (&buf, svc_updatestatlong);
	MSG_WriteByte (&buf, STAT_SECRETS);
	MSG_WriteLong (&buf, cl.stats[STAT_SECRETS]);

	MSG_WriteByte (&buf, svc_updatestatlong);
	MSG_WriteByte (&buf, STAT_MONSTERS);
	MSG_WriteLong (&buf, cl.stats[STAT_MONSTERS]);
#endif

	// get the client to check and download skins
	// when that is completed, a begin command will be issued
	MSG_WriteByte (&buf, svc_stufftext);
	MSG_WriteString (&buf, va("skins\n") );

	CL_WriteRecordDemoMessage (&buf, seq++);

	CL_WriteSetDemoMessage();

	// done
}

/*
====================
CL_ReRecord_f

record <demoname>
====================
*/
void CL_ReRecord_f (void)
{
	int		c;
	char	name[MAX_OSPATH];

	c = Cmd_Argc();
	if (c != 2)
	{
		Con_Printf ("rerecord <demoname>\n");
		return;
	}

	if (!*cls.servername) {
		Con_Printf("No server to reconnect to...\n");
		return;
	}

	if (cls.demorecording)
		CL_Stop_f();
  
	snprintf(name, sizeof(name), "%s/%s", com_gamedir, Cmd_Argv(1));

//
// open the demo file
//
	COM_DefaultExtension (name, ".qwd");

	cls.demofile = gzopen (name, "wb");
	if (!cls.demofile)
	{
		Con_Printf ("ERROR: couldn't open.\n");
		return;
	}

	Con_Printf ("recording to %s.\n", name);
	cls.demorecording = true;

	CL_Disconnect();
	CL_BeginServerConnect();
}


/*
====================
CL_PlayDemo_f

play [demoname]
====================
*/
void CL_PlayDemo_f (void)
{
	char	name[256];

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("play <demoname> : plays a demo\n");
		return;
	}

//
// disconnect from server
//
	CL_Disconnect ();
	
//
// open the demo file
//
	strcpy (name, Cmd_Argv(1));
	COM_DefaultExtension (name, ".qwd");

	Con_Printf ("Playing demo from %s.\n", name);
	COM_FOpenFile (name, &cls.demofile);
	if (!cls.demofile)
	{
		Con_Printf ("ERROR: couldn't open.\n");
		cls.demonum = -1;		// stop demo loop
		return;
	}

	cls.demoplayback = true;
	cls.state = ca_demostart;
	Netchan_Setup (&cls.netchan, net_from, 0);
	realtime = 0;
}

/*
====================
CL_FinishTimeDemo

====================
*/
void CL_FinishTimeDemo (void)
{
	int		frames;
	float	time;
	
	cls.timedemo = false;
	
// the first frame didn't count
	frames = (host_framecount - cls.td_startframe) - 1;
	time = Sys_DoubleTime() - cls.td_starttime;
	if (!time)
		time = 1;
	Con_Printf ("%i frames %5.1f seconds %5.1f fps\n", frames, time, frames/time);
}

/*
====================
CL_TimeDemo_f

timedemo [demoname]
====================
*/
void CL_TimeDemo_f (void)
{
	if (Cmd_Argc() != 2)
	{
		Con_Printf ("timedemo <demoname> : gets demo speeds\n");
		return;
	}

	CL_PlayDemo_f ();
	
	if (cls.state != ca_demostart)
		return;

// cls.td_starttime will be grabbed at the second frame of the demo, so
// all the loading time doesn't get counted
	
	cls.timedemo = true;
	cls.td_starttime = 0;
	cls.td_startframe = host_framecount;
	cls.td_lastframe = -1;		// get a new message this frame
}