/*
	cl_main.c

	entity parsing and management

	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

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

static __attribute__ ((used)) const char rcsid[] = 
	"$Id$";

#include "QF/cbuf.h"
#include "QF/cmd.h"
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/input.h"
#include "QF/keys.h"
#include "QF/msg.h"
#include "QF/plugin.h"
#include "QF/qfplist.h"
#include "QF/render.h"
#include "QF/screen.h"
#include "QF/skin.h"
#include "QF/sys.h"
#include "QF/va.h"

#include "chase.h"
#include "client.h"
#include "compat.h"
#include "host.h"
#include "host.h"
#include "r_cvar.h"
#include "r_dynamic.h"
#include "server.h"

byte       *vid_colormap;

// these two are not intended to be set directly
cvar_t     *cl_name;

cvar_t     *cl_writecfg;

cvar_t     *cl_shownet;
cvar_t     *cl_nolerp;

cvar_t     *cl_cshift_bonus; 
cvar_t     *cl_cshift_contents; 
cvar_t     *cl_cshift_damage; 
cvar_t     *cl_cshift_powerup; 

cvar_t     *lookspring;

cvar_t     *m_pitch;
cvar_t     *m_yaw;
cvar_t     *m_forward;
cvar_t     *m_side;

cvar_t     *hud_fps;
cvar_t     *hud_time;

int         fps_count;

client_static_t cls;
client_state_t cl;

// FIXME: put these on hunk?
entity_t    cl_entities[MAX_EDICTS];
cl_entity_state_t    cl_baselines[MAX_EDICTS];


void
CL_InitCvars (void)
{
	cl_cshift_bonus = Cvar_Get ("cl_cshift_bonus", "1", CVAR_ARCHIVE, NULL,
								"Show bonus flash on item pickup");
	cl_cshift_contents = Cvar_Get ("cl_cshift_content", "1", CVAR_ARCHIVE,
								   NULL, "Shift view colors for contents "
								   "(water, slime, etc)");
	cl_cshift_damage = Cvar_Get ("cl_cshift_damage", "1", CVAR_ARCHIVE, NULL, 
								 "Shift view colors on damage");
	cl_cshift_powerup = Cvar_Get ("cl_cshift_powerup", "1", CVAR_ARCHIVE, NULL,                             "Shift view colors for powerups");
	cl_name = Cvar_Get ("_cl_name", "player", CVAR_ARCHIVE, NULL,
						"Player name");
	cl_color = Cvar_Get ("_cl_color", "0", CVAR_ARCHIVE, NULL, "Player color");
	cl_anglespeedkey = Cvar_Get ("cl_anglespeedkey", "1.5", CVAR_NONE, NULL,
								 "turn `run' speed multiplier");
	cl_backspeed = Cvar_Get ("cl_backspeed", "200", CVAR_ARCHIVE, NULL,
							 "backward speed");
	cl_forwardspeed = Cvar_Get ("cl_forwardspeed", "200", CVAR_ARCHIVE, NULL,
								"forward speed");
	cl_movespeedkey = Cvar_Get ("cl_movespeedkey", "2.0", CVAR_NONE, NULL,
								"move `run' speed multiplier");
	cl_pitchspeed = Cvar_Get ("cl_pitchspeed", "150", CVAR_NONE, NULL,
							  "look up/down speed");
	cl_sidespeed = Cvar_Get ("cl_sidespeed", "350", CVAR_NONE, NULL,
							 "strafe speed");
	cl_upspeed = Cvar_Get ("cl_upspeed", "200", CVAR_NONE, NULL,
						   "swim/fly up/down speed");
	cl_yawspeed = Cvar_Get ("cl_yawspeed", "140", CVAR_NONE, NULL,
							"turning speed");
	cl_writecfg = Cvar_Get ("cl_writecfg", "1", CVAR_NONE, NULL,
							"write config files?");
	cl_shownet = Cvar_Get ("cl_shownet", "0", CVAR_NONE, NULL,
						   "show network packets. 0=off, 1=basic, 2=verbose");
	cl_nolerp = Cvar_Get ("cl_nolerp", "0", CVAR_NONE, NULL,
						  "linear motion interpolation");
	lookspring = Cvar_Get ("lookspring", "0", CVAR_ARCHIVE, NULL, "Snap view "
						   "to center when moving and no mlook/klook");
	m_pitch = Cvar_Get ("m_pitch", "0.022", CVAR_ARCHIVE, NULL,
						"mouse pitch (up/down) multipier");
	m_yaw =	Cvar_Get ("m_yaw", "0.022", CVAR_ARCHIVE, NULL,
					  "mouse yaw (left/right) multipiler");
	m_forward = Cvar_Get ("m_forward", "1", CVAR_ARCHIVE, NULL,
						  "mouse forward/back speed");
	m_side = Cvar_Get ("m_side", "0.8", CVAR_ARCHIVE, NULL,
					   "mouse strafe speed");
	hud_fps = Cvar_Get ("hud_fps", "0", CVAR_ARCHIVE, NULL,
						"display realtime frames per second");
	Cvar_MakeAlias ("show_fps", hud_fps);
	hud_time = Cvar_Get ("hud_time", "0", CVAR_ARCHIVE, NULL,
						 "display the current time");
}

void
CL_ClearState (void)
{
	int         i;

	if (!sv.active)
		Host_ClearMemory ();

	if (cl.edicts)
		PL_Free (cl.edicts);

	// wipe the entire cl structure
	memset (&cl, 0, sizeof (cl));
	r_force_fullscreen = 0;

	CL_Init_Entity (&cl.viewent);
	r_view_model = &cl.viewent;

	SZ_Clear (&cls.message);

	// clear other arrays   
	memset (cl_entities, 0, sizeof (cl_entities));
	memset (cl_baselines, 0, sizeof (cl_baselines));
	memset (r_lightstyle, 0, sizeof (r_lightstyle));

	Skin_ClearTempSkins ();

	CL_ClearTEnts ();

	R_ClearEfrags ();
	R_ClearDlights ();
	R_ClearParticles ();

	for (i = 0; i < MAX_EDICTS; i++) {
		cl_baselines[i].ent = &cl_entities[i];
		CL_Init_Entity (cl_entities + i);
	}
}

/*
	CL_StopCshifts

	Cleans the Cshifts, so your screen doesn't stay red after a timedemo :)
*/
static void
CL_StopCshifts (void)
{
	int i;

	for (i = 0; i < NUM_CSHIFTS; i++)
		cl.cshifts[i].percent = 0;
	for (i = 0; i < MAX_CL_STATS; i++)
		cl.stats[i] = 0;
}

/*
	CL_Disconnect

	Sends a disconnect message to the server
	This is also called on Host_Error, so it shouldn't cause any errors
*/
void
CL_Disconnect (void)
{
	// stop sounds (especially looping!)
	S_StopAllSounds ();

	// Clean the Cshifts
	CL_StopCshifts ();

	// bring the console down and fade the colors back to normal
//	SCR_BringDownConsole ();

	// if running a local server, shut it down
	if (cls.demoplayback)
		CL_StopPlayback ();
	else if (cls.state == ca_connected) {
		if (cls.demorecording)
			CL_StopRecording ();

		Sys_MaskPrintf (SYS_DEV, "Sending clc_disconnect\n");
		SZ_Clear (&cls.message);
		MSG_WriteByte (&cls.message, clc_disconnect);
		NET_SendUnreliableMessage (cls.netcon, &cls.message);
		SZ_Clear (&cls.message);
		NET_Close (cls.netcon);

		CL_SetState (ca_disconnected);
		if (sv.active)
			Host_ShutdownServer (false);
	}

	cls.signon = 0;
	cl.worldmodel = NULL;
}

void
CL_Disconnect_f (void)
{
	CL_Disconnect ();
	if (sv.active)
		Host_ShutdownServer (false);
}

/*
	CL_EstablishConnection

	Host should be either "local" or a net address to be passed on
*/
void
CL_EstablishConnection (const char *host)
{
	if (cls.state == ca_dedicated)
		return;

	if (cls.demoplayback)
		return;

	CL_Disconnect ();

	cls.netcon = NET_Connect (host);
	if (!cls.netcon)
		Host_Error ("CL_Connect: connect failed\n");
	Sys_MaskPrintf (SYS_DEV, "CL_EstablishConnection: connected to %s\n",
					host);

	cls.demonum = -1;					// not in the demo loop now
	CL_SetState (ca_connected);
	cls.signon = 0;						// need all the signon messages
										// before playing
	key_dest = key_game;
	game_target = IMT_0;
}

/*
	CL_SignonReply

	An svc_signonnum has been received, perform a client side setup
*/
void
CL_SignonReply (void)
{
	char        str[8192];

	Sys_MaskPrintf (SYS_DEV, "CL_SignonReply: %i\n", cls.signon);

	switch (cls.signon) {
	case 1:
		MSG_WriteByte (&cls.message, clc_stringcmd);
		MSG_WriteString (&cls.message, "prespawn");
		break;

	case 2:
		MSG_WriteByte (&cls.message, clc_stringcmd);
		MSG_WriteString (&cls.message, va ("name \"%s\"\n", cl_name->string));
		MSG_WriteByte (&cls.message, clc_stringcmd);
		MSG_WriteString (&cls.message,
						 va ("color %i %i\n", (cl_color->int_val) >> 4,
							 (cl_color->int_val) & 15));
		MSG_WriteByte (&cls.message, clc_stringcmd);
		snprintf (str, sizeof (str), "spawn %s", cls.spawnparms);
		MSG_WriteString (&cls.message, str);
		break;

	case 3:
		MSG_WriteByte (&cls.message, clc_stringcmd);
		MSG_WriteString (&cls.message, "begin");
		Cache_Report ();				// print remaining memory
		break;

	case 4:
//		SCR_EndLoadingPlaque ();		// allow normal screen updates
		break;
	}
}

/*
	CL_NextDemo

	Called to play the next demo in the demo loop
*/
void
CL_NextDemo (void)
{
	if (cls.demonum == -1)
		return;							// don't play demos

	if (!cls.demos[cls.demonum][0] || cls.demonum == MAX_DEMOS) {
		cls.demonum = 0;
		if (!cls.demos[cls.demonum][0]) {
			Sys_Printf ("No demos listed with startdemos\n");
			cls.demonum = -1;
			return;
		}
	}

	Cbuf_InsertText (host_cbuf, va ("playdemo %s\n", cls.demos[cls.demonum]));
	cls.demonum++;
}

static void
CL_PrintEntities_f (void)
{
	entity_t   *ent;
	int         i;

	for (i = 0, ent = cl_entities; i < cl.num_entities; i++, ent++) {
		Sys_Printf ("%3i:", i);
		if (!ent->model) {
			Sys_Printf ("EMPTY\n");
			continue;
		}
		Sys_Printf ("%s:%2i  (%5.1f,%5.1f,%5.1f) [%5.1f %5.1f %5.1f]\n",
					ent->model->name, ent->frame, ent->origin[0],
					ent->origin[1], ent->origin[2], ent->angles[0],
					ent->angles[1], ent->angles[2]);
	}
}

/*
	SetPal

	Debugging tool, just flashes the screen
*/
static void
SetPal (int i)
{
#if 0
	byte        pal[768];
	int         c;
	static int  old;

	if (i == old)
		return;
	old = i;

	if (i == 0)
		VID_SetPalette (vid.palette);
	else if (i == 1) {
		for (c = 0; c < 768; c += 3) {
			pal[c] = 0;
			pal[c + 1] = 255;
			pal[c + 2] = 0;
		}
		VID_SetPalette (pal);
	} else {
		for (c = 0; c < 768; c += 3) {
			pal[c] = 0;
			pal[c + 1] = 0;
			pal[c + 2] = 255;
		}
		VID_SetPalette (pal);
	}
#endif
}

static void
CL_NewDlight (int key, vec3_t org, int effects)
{
	float       radius;
	float       time = 0.1;
	dlight_t   *dl;
	static quat_t normal = {0.4, 0.2, 0.05, 0.7};
	static quat_t red = {0.5, 0.05, 0.05, 0.7};
	static quat_t blue = {0.05, 0.05, 0.5, 0.7};
	static quat_t purple = {0.5, 0.05, 0.5, 0.7};

	if (!(effects & (EF_BLUE | EF_RED | EF_BRIGHTLIGHT | EF_DIMLIGHT)))
		return;

	dl = R_AllocDlight (key);
	if (!dl)
		return;
	VectorCopy (org, dl->origin);
	radius = 200 + (rand () & 31);
	if (effects & EF_BRIGHTLIGHT) {
		radius += 200;
		dl->origin[2] += 16;
	}
	if (effects & EF_DIMLIGHT)
		if (effects & ~EF_DIMLIGHT)
			radius -= 100;
	dl->radius = radius;
	dl->die = cl.time + time;

	switch (effects & (EF_BLUE | EF_RED)) {
		case EF_RED | EF_BLUE:
			QuatCopy (purple, dl->color);
			break;
		case EF_RED:
			QuatCopy (red, dl->color);
			break;
		case EF_BLUE:
			QuatCopy (blue, dl->color);
			break;
		default:
			QuatCopy (normal, dl->color);
			break;
	}
}

/*
	CL_LerpPoint

	Determines the fraction between the last two messages that the objects
	should be put at.
*/
static float
CL_LerpPoint (void)
{
	float       f, frac;

	f = cl.mtime[0] - cl.mtime[1];

	if (!f || cl_nolerp->int_val || cls.timedemo || sv.active) {
		cl.time = cl.mtime[0];
		return 1;
	}

	if (f > 0.1) {						// dropped packet, or start of demo
		cl.mtime[1] = cl.mtime[0] - 0.1;
		f = 0.1;
	}
	frac = (cl.time - cl.mtime[1]) / f;

	if (frac < 0) {
		if (frac < -0.01) {
			SetPal (1);
			cl.time = cl.mtime[1];
		}
		frac = 0;
	} else if (frac > 1) {
		if (frac > 1.01) {
			SetPal (2);
			cl.time = cl.mtime[0];
		}
		frac = 1;
	} else
		SetPal (0);

	return frac;
}

static void
CL_RelinkEntities (void)
{
	entity_t   *ent;
	cl_entity_state_t *state;
	dlight_t   *dl;
	float       bobjrotate, frac, f, d;
	int         i, j;
	vec3_t      delta;
	
	r_player_entity = &cl_entities[cl.viewentity];

	// determine partial update time    
	frac = CL_LerpPoint ();

	// interpolate player info
	for (i = 0; i < 3; i++)
		cl.velocity[i] = cl.mvelocity[1][i] +
			frac * (cl.mvelocity[0][i] - cl.mvelocity[1][i]);

	if (cls.demoplayback) {
		// interpolate the angles   
		for (j = 0; j < 3; j++) {
			d = cl.mviewangles[0][j] - cl.mviewangles[1][j];
			if (d > 180)
				d -= 360;
			else if (d < -180)
				d += 360;
			cl.viewangles[j] = cl.mviewangles[1][j] + frac * d;
		}
	}

	bobjrotate = anglemod (100 * cl.time);

	// start on the entity after the world
	for (i = 1, state = cl_baselines + 1; i < cl.num_entities; i++, state++) {
		ent = state->ent;
		if (!ent->model) {				// empty slot
			if (ent->efrag)
				R_RemoveEfrags (ent);	// just became empty
			continue;
		}
		// if the object wasn't included in the last packet, remove it
		if (state->msgtime != cl.mtime[0]) {
			ent->model = NULL;
			//johnfitz -- next time this entity slot is reused, the lerp will
			//need to be reset
			ent->lerpflags |= LERP_RESETMOVE|LERP_RESETANIM;
			if (ent->efrag)
				R_RemoveEfrags (ent);	// just became empty
			continue;
		}

		ent->colormod[3] = ENTALPHA_DECODE (state->alpha);

		VectorCopy (ent->origin, ent->old_origin);

		if (state->forcelink) {
			// The entity was not updated in the last message so move to the
			// final spot
			VectorCopy (state->msg_origins[0], ent->origin);
			VectorCopy (state->msg_angles[0], ent->angles);
			if (i != cl.viewentity || chase_active->int_val) {
				if (ent->efrag)
					R_RemoveEfrags (ent);
				R_AddEfrags (ent);
			}
		} else {
			// If the delta is large, assume a teleport and don't lerp
			f = frac;
			VectorSubtract (state->msg_origins[0],
							state->msg_origins[1], delta);
			if (fabs (delta[0]) > 100 || fabs (delta[1] > 100)
				|| fabs (delta[2]) > 100) {
				// assume a teleportation, not a motion
				VectorCopy (state->msg_origins[0], ent->origin);
				VectorCopy (state->msg_angles[0], ent->angles);
				ent->lerpflags |= LERP_RESETMOVE;
			} else {
				// interpolate the origin and angles
				// FIXME r_lerpmove.value &&
				if (ent->lerpflags & LERP_MOVESTEP)
					f = 1;
				VectorMultAdd (state->msg_origins[1], f, delta, ent->origin);
				for (j = 0; j < 3; j++) {
					d = state->msg_angles[0][j] - state->msg_angles[1][j];
					if (d > 180)
						d -= 360;
					else if (d < -180)
						d += 360;
					ent->angles[j] = state->msg_angles[1][j] + f * d;
				}
			}
			if (i != cl.viewentity || chase_active->int_val) {
				if (ent->efrag) {
					if (!VectorCompare (ent->origin, ent->old_origin)) {
						R_RemoveEfrags (ent);
						R_AddEfrags (ent);
					}
				} else {
					R_AddEfrags (ent);
				}
			}
		}

		// rotate binary objects locally
		if (ent->model->flags & EF_ROTATE)
			ent->angles[1] = bobjrotate;

		if (state->effects & EF_BRIGHTFIELD)
			R_EntityParticles (ent);
		if (state->effects & EF_MUZZLEFLASH) {
			vec3_t      fv, rv, uv;

			dl = R_AllocDlight (i);
			if (dl) {
				AngleVectors (ent->angles, fv, rv, uv);

				VectorMultAdd (ent->origin, 18, fv, dl->origin);
				dl->origin[2] += 16;
				dl->radius = 200 + (rand () & 31);
				dl->die = cl.time + 0.1;
				dl->minlight = 32;
				dl->color[0] = 0.2;
				dl->color[1] = 0.1;
				dl->color[2] = 0.05;
				dl->color[3] = 0.7;
			}
#if 0		//FIXME how much do we want this?
			//johnfitz -- assume muzzle flash accompanied by muzzle flare,
			//which looks bad when lerped
			if (ent == &cl_entities[cl.viewentity])
				cl.viewent.lerpflags |= LERP_RESETANIM | LERP_RESETANIM2;
			else
				ent->lerpflags |= LERP_RESETANIM | LERP_RESETANIM2;
#endif
		}
		CL_NewDlight (i, ent->origin, state->effects);
		if (VectorDistance_fast (state->msg_origins[1], ent->origin)
			> (256 * 256))
			VectorCopy (ent->origin, state->msg_origins[1]);
		if (ent->model->flags & EF_ROCKET) {
			dl = R_AllocDlight (i);
			if (dl) {
				VectorCopy (ent->origin, dl->origin);
				dl->radius = 200;
				dl->die = cl.time + 0.1;
				VectorCopy (r_firecolor->vec, dl->color);
				dl->color[3] = 0.7;
			}
			R_RocketTrail (ent);
		} else if (ent->model->flags & EF_GRENADE)
			R_GrenadeTrail (ent);
		else if (ent->model->flags & EF_GIB)
			R_BloodTrail (ent);
		else if (ent->model->flags & EF_ZOMGIB)
			R_SlightBloodTrail (ent);
		else if (ent->model->flags & EF_TRACER)
			R_WizTrail (ent);
		else if (ent->model->flags & EF_TRACER2)
			R_FlameTrail (ent);
		else if (ent->model->flags & EF_TRACER3)
			R_VoorTrail (ent);
		else if (ent->model->flags & EF_GLOWTRAIL)
			R_GlowTrail (ent, state->glow_color);

		state->forcelink = false;
	}
}

/*
	CL_ReadFromServer

	Read all incoming data from the server
*/
int
CL_ReadFromServer (void)
{
	int         ret;

	cl.oldtime = cl.time;
	cl.time += host_frametime;

	do {
		ret = CL_GetMessage ();
		if (ret == -1)
			Host_Error ("CL_ReadFromServer: lost server connection");
		if (!ret)
			break;

		cl.last_received_message = realtime;
		CL_ParseServerMessage ();
	} while (ret && cls.state == ca_connected);

	if (cl_shownet->int_val)
		Sys_Printf ("\n");

	CL_RelinkEntities ();
	CL_UpdateTEnts ();

	// bring the links up to date
	return 0;
}

void
CL_SendCmd (void)
{
	usercmd_t   cmd;

	if (cls.state != ca_connected)
		return;

	if (cls.signon == SIGNONS) {
		CL_BaseMove (&cmd);

		// send the unreliable message
		CL_SendMove (&cmd);

	}

	if (cls.demoplayback) {
		SZ_Clear (&cls.message);
		return;
	}
	// send the reliable message
	if (!cls.message.cursize)
		return;							// no message at all

	if (!NET_CanSendMessage (cls.netcon)) {
		Sys_MaskPrintf (SYS_DEV, "CL_WriteToServer: can't send\n");
		return;
	}

	if (NET_SendMessage (cls.netcon, &cls.message) == -1)
		Host_Error ("CL_WriteToServer: lost server connection");

	SZ_Clear (&cls.message);
}

void
CL_SetState (cactive_t state)
{
	cactive_t   old_state = cls.state;
	cls.state = state;
	if (old_state != state) {
		if (state == ca_active) {
			// entering active state
			r_active = true;
			game_target = IMT_0;
			key_dest = key_game;
			IN_ClearStates ();
			VID_SetCaption ("");
		} else if (old_state == ca_active) {
			// leaving active state
			r_active = false;
			game_target = IMT_CONSOLE;
			key_dest = key_console;
			VID_SetCaption ("Disconnected");
		}
		if (state == ca_connected)
			S_AmbientOn ();
		else
			S_AmbientOff ();
	}
	if (con_module)
		con_module->data->console->force_commandline = (state != ca_active);
}

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

void
CL_Init (void)
{
	SZ_Alloc (&cls.message, 1024);

	CL_InitInput ();
	CL_TEnts_Init ();
	CL_ClearState ();

	Cmd_AddCommand ("entities", CL_PrintEntities_f, "No Description");
	Cmd_AddCommand ("disconnect", CL_Disconnect_f, "No Description");
	Cmd_AddCommand ("maplist", Con_Maplist_f, "List available maps");
	Cmd_AddCommand ("skyboxlist", Con_Skyboxlist_f, "List skyboxes available");
	Cmd_AddCommand ("demolist", Con_Demolist_DEM_f, "List available demos");
	Cmd_AddCommand ("force_centerview", Force_CenterView_f, "force the view "
					"to be level");
}