#include "quakedef.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;

    fclose(cls.demofile);
    cls.demofile = NULL;
    cls.state = ca_disconnected;

    if (cls.timedemo)
	CL_FinishTimeDemo();
}

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

Dumps the current net message, prefixed by the length and view angles
====================
*/
void CL_WriteDemoMessage(void)
{
    int len;
    int i;
    float f;

    len = LittleLong(net_message.cursize);
    fwrite(&len, 4, 1, cls.demofile);
    for (i = 0; i < 3; i++) {
	f = LittleFloat(cl.viewangles[i]);
	fwrite(&f, 4, 1, cls.demofile);
    }
    fwrite(net_message.data, net_message.cursize, 1, cls.demofile);
    fflush(cls.demofile);
}

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

Handles recording and playback of demos, on top of NET_ code
====================
*/
int CL_GetMessage(void)
{
    int r, i;
    float f;

    if (cls.demoplayback) {

	// decide if it is time to grab the next message                
	if (cls.signon == SIGNONS)	// allways grab until fully connected
	{
	    if (cls.timedemo) {
		if (host_framecount == cls.td_lastframe)
		    return 0;	// allready read this frame's message
		cls.td_lastframe = host_framecount;
		// if this is the second frame, grab the real td_starttime
		// so the bogus time on the first frame doesn't count
		if (host_framecount == cls.td_startframe + 1)
		    cls.td_starttime = realtime;
	    } else if ( /* cl.time > 0 && */ cl.time <= cl.mtime[0])
		return 0;	// don't need another message yet
	}
	// get the next message
	fread(&net_message.cursize, 4, 1, cls.demofile);
	VectorCopy(cl.mviewangles[0], cl.mviewangles[1]);
	for (i = 0; i < 3; i++) {
	    r = fread(&f, 4, 1, cls.demofile);
	    cl.mviewangles[0][i] = LittleFloat(f);
	}

	net_message.cursize = LittleLong(net_message.cursize);
	if (net_message.cursize > MAX_MSGLEN)
	    Sys_Error("Demo message > MAX_MSGLEN");
	r = fread(net_message.data, net_message.cursize, 1, cls.demofile);
	if (r != 1) {
	    CL_StopPlayback();
	    return 0;
	}

	return 1;
    }

    while (1) {
	r = NET_GetMessage(cls.netcon);

	if (r != 1 && r != 2)
	    return r;

	// discard nop keepalive message
	if (net_message.cursize == 1 && net_message.data[0] == svc_nop)
	    Con_Printf("<-- server to client keepalive\n");
	else
	    break;
    }

    if (cls.demorecording)
	CL_WriteDemoMessage();

    return r;
}


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

stop recording a demo
====================
*/
void CL_Stop_f(void)
{
    if (cmd_source != src_command)
	return;

    if (!cls.demorecording) {
	Con_Printf("Not recording a demo.\n");
	return;
    }
// write a disconnect message to the demo file
    SZ_Clear(&net_message);
    MSG_WriteByte(&net_message, svc_disconnect);
    CL_WriteDemoMessage();

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

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

record <demoname> <map> [cd track]
====================
*/
void CL_Record_f(void)
{
    int c;
    char name[MAX_OSPATH];
    int track;

    if (cmd_source != src_command)
	return;

    c = Cmd_Argc();
    if (c != 3 && c != 4) {
	Con_Printf("record <demoname> <map> [cd track]\n");
	return;
    }
// write the forced cd track number, or -1
    if (c == 4) {
	track = atoi(Cmd_Argv(3));
	Con_Printf("Forcing CD track to %i\n", cls.forcetrack);
    } else
	track = -1;

    sprintf(name, "%s/%s", com_gamedir, Cmd_Argv(1));

//
// start the map up
//
    Cmd_ExecuteString(va("map %s", Cmd_Argv(2)), src_command);

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

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

    cls.forcetrack = track;
    fprintf(cls.demofile, "%i\n", cls.forcetrack);

    cls.demorecording = true;
}


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

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

    if (cmd_source != src_command)
	return;

    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, ".dem");

    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_connected;
    fscanf(cls.demofile, "%i\n", &cls.forcetrack);
}

/*
====================
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 = realtime - 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_source != src_command)
	return;

    if (Cmd_Argc() != 2) {
	Con_Printf("timedemo <demoname> : gets demo speeds\n");
	return;
    }

    CL_PlayDemo_f();

    if (cls.signon != SIGNONS)
	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_startframe = host_framecount;
    cls.td_lastframe = -1;	// get a new message this frame
}