/*
	cl_tent.c

	client side temporary entities

	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__ ((unused)) const char rcsid[] = 
	"$Id$";

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include <math.h>
#include <stdlib.h>

#include "QF/console.h"
#include "QF/model.h"
#include "QF/msg.h"
#include "QF/sound.h"
#include "QF/sys.h"

#include "cl_ents.h"
#include "cl_main.h"
#include "cl_tent.h"
#include "client.h"
#include "compat.h"
#include "r_dynamic.h"

#define	MAX_BEAMS 8
#define MAX_BEAM_ENTS 20

typedef struct {
	int         entity;
	struct model_s *model;
	float       endtime;
	vec3_t      start, end;
	entity_t    ent_list[MAX_BEAM_ENTS];
	int         ent_count;
	int         seed;
} beam_t;

beam_t      cl_beams[MAX_BEAMS];

#define	MAX_EXPLOSIONS 8

typedef struct {
	float       start;
	entity_t    ent;
} explosion_t;

explosion_t cl_explosions[MAX_EXPLOSIONS];

sfx_t      *cl_sfx_wizhit;
sfx_t      *cl_sfx_knighthit;
sfx_t      *cl_sfx_tink1;
sfx_t      *cl_sfx_ric1;
sfx_t      *cl_sfx_ric2;
sfx_t      *cl_sfx_ric3;
sfx_t      *cl_sfx_r_exp3;

model_t	   *cl_mod_beam;
model_t    *cl_mod_bolt;
model_t    *cl_mod_bolt2;
model_t    *cl_mod_bolt3;
model_t    *cl_spr_explod;

static void
CL_TEnts_Precache (void)
{
	cl_sfx_wizhit = S_PrecacheSound ("wizard/hit.wav");
	cl_sfx_knighthit = S_PrecacheSound ("hknight/hit.wav");
	cl_sfx_tink1 = S_PrecacheSound ("weapons/tink1.wav");
	cl_sfx_ric1 = S_PrecacheSound ("weapons/ric1.wav");
	cl_sfx_ric2 = S_PrecacheSound ("weapons/ric2.wav");
	cl_sfx_ric3 = S_PrecacheSound ("weapons/ric3.wav");
	cl_sfx_r_exp3 = S_PrecacheSound ("weapons/r_exp3.wav");

	cl_mod_bolt = Mod_ForName ("progs/bolt.mdl", true);
	cl_mod_bolt2 = Mod_ForName ("progs/bolt2.mdl", true);
	cl_mod_bolt3 = Mod_ForName ("progs/bolt3.mdl", true);
	cl_spr_explod = Mod_ForName ("progs/s_explod.spr", true);
	cl_mod_beam = Mod_ForName ("progs/beam.mdl", false);
	if (!cl_mod_beam)
		cl_mod_beam = cl_mod_bolt;
}

void
CL_TEnts_Init (void)
{
	QFS_GamedirCallback (CL_TEnts_Precache);
	CL_TEnts_Precache ();
}

void
CL_Init_Entity (entity_t *ent)
{
	memset (ent, 0, sizeof (*ent));

	ent->colormap = vid.colormap8;
	ent->colormod[0] = ent->colormod[1] = ent->colormod[2] =
		ent->colormod[3] = 1.0;
	ent->scale = 1.0;
	ent->pose1 = ent->pose2 = -1;
}

void
CL_ClearTEnts (void)
{
	int		i;

	memset (&cl_beams, 0, sizeof (cl_beams));
	memset (&cl_explosions, 0, sizeof (cl_explosions));
	for (i = 0; i < MAX_BEAMS; i++) {
		int j;

		for (j = 0; j < MAX_BEAM_ENTS; j++) {
			CL_Init_Entity (&cl_beams[i].ent_list[j]);
		}
	}
	for (i = 0; i < MAX_EXPLOSIONS; i++) {
		CL_Init_Entity (&cl_explosions[i].ent);
	}
}

static explosion_t *
CL_AllocExplosion (void)
{
	float       time;
	int         index, i;

	for (i = 0; i < MAX_EXPLOSIONS; i++)
		if (!cl_explosions[i].ent.model)
			return &cl_explosions[i];
	// find the oldest explosion
	time = cl.time;
	index = 0;

	for (i = 0; i < MAX_EXPLOSIONS; i++)
		if (cl_explosions[i].start < time) {
			time = cl_explosions[i].start;
			index = i;
		}
	return &cl_explosions[index];
}

static beam_t *
beam_alloc (int ent)
{
	int         i;
	beam_t     *b;

	// override any beam with the same entity
	for (i = 0, b = cl_beams; i < MAX_BEAMS; i++, b++)
		if (b->entity == ent)
			return b;
	// find a free beam
	for (i = 0, b = cl_beams; i < MAX_BEAMS; i++, b++)
		if (!b->model || b->endtime < cl.time)
			return b;
	Con_Printf ("beam list overflow!\n");
	return 0;
}

static inline void
beam_clear (beam_t *b)
{
	if (b->ent_count) {
		entity_t   *e = b->ent_list + b->ent_count;

		while (e != b->ent_list)
			R_RemoveEfrags (e-- - 1);
		b->ent_count = 0;
	}
}

static inline void
beam_setup (beam_t *b)
{
	entity_t   *ent;
	float       forward, pitch, yaw, d;
	int         ent_count;
	vec3_t      dist, org;

	// calculate pitch and yaw
	VectorSubtract (b->end, b->start, dist);

	if (dist[1] == 0 && dist[0] == 0) {
		yaw = 0;
		if (dist[2] > 0)
			pitch = 90;
		else
			pitch = 270;
	} else {
		yaw = (int) (atan2 (dist[1], dist[0]) * 180 / M_PI);
		if (yaw < 0)
			yaw += 360;

		forward = sqrt (dist[0] * dist[0] + dist[1] * dist[1]);
		pitch = (int) (atan2 (dist[2], forward) * 180 / M_PI);
		if (pitch < 0)
			pitch += 360;
	}

	// add new entities for the lightning
	VectorCopy (b->start, org);
	d = VectorNormalize (dist);
	VectorScale (dist, 30, dist);
	ent_count = ceil (d / 30);
	ent_count = min (ent_count, MAX_BEAM_ENTS);
	b->ent_count = ent_count;
	d = 0;
	while (ent_count--) {
		ent = &b->ent_list[ent_count];
		VectorMultAdd (org, d, dist, ent->origin);
		d += 1.0;
		ent->model = b->model;
		ent->angles[0] = pitch;
		ent->angles[1] = yaw;
		if (!ent->efrag)
			R_AddEfrags (ent);
	}
}

static void
CL_ParseBeam (model_t *m)
{
	beam_t     *b;
	int         ent;
	vec3_t      start, end;

	ent = MSG_ReadShort (net_message);

	MSG_ReadCoordV (net_message, start);
	MSG_ReadCoordV (net_message, end);

	if ((b = beam_alloc (ent))) {
		beam_clear (b);
		b->entity = ent;
		b->model = m;
		b->endtime = cl.time + 0.2;
		b->seed = rand ();
		VectorCopy (end, b->end);
		if (b->entity != cl.viewentity) {
			// this will be done in CL_UpdateBeams
			VectorCopy (start, b->start);
			beam_setup (b);
		}
	}
}

void
CL_ParseTEnt (void)
{
	byte         type;
	dlight_t    *dl;
	explosion_t *ex;
	int          colorStart, colorLength;
	int          cnt = -1;
	vec3_t       pos;
	sfx_t *	 	 spike_sound[] = {
		cl_sfx_ric3, cl_sfx_ric3, cl_sfx_ric2, cl_sfx_ric1,
	};

	type = MSG_ReadByte (net_message);
	switch (type) {
		case TE_WIZSPIKE:				// spike hitting wall
			MSG_ReadCoordV (net_message, pos);
			R_WizSpikeEffect (pos);
			S_StartSound (-1, 0, cl_sfx_wizhit, pos, 1, 1);
			break;

		case TE_KNIGHTSPIKE:			// spike hitting wall
			MSG_ReadCoordV (net_message, pos);
			R_KnightSpikeEffect (pos);
			S_StartSound (-1, 0, cl_sfx_knighthit, pos, 1, 1);
			break;

		case TE_SPIKE:					// spike hitting wall
			MSG_ReadCoordV (net_message, pos);
			R_SpikeEffect (pos);
			{
				int		i;
				sfx_t  *sound;

				i = (rand () % 20) - 16;
				if (i >= 0)
					sound = spike_sound[i];
				else
					sound = cl_sfx_tink1;
				S_StartSound (-1, 0, sound, pos, 1, 1);
			}
			break;

		case TE_SUPERSPIKE:				// super spike hitting wall
			MSG_ReadCoordV (net_message, pos);
			R_SuperSpikeEffect (pos);
			{
				int		i;
				sfx_t  *sound;

				i = (rand () % 20) - 16;
				if (i >= 0)
					sound = spike_sound[i];
				else
					sound = cl_sfx_tink1;
				S_StartSound (-1, 0, sound, pos, 1, 1);
			}
			break;

		case TE_EXPLOSION:				// rocket explosion
			// particles
			MSG_ReadCoordV (net_message, pos);
			R_ParticleExplosion (pos);

			// light
			dl = R_AllocDlight (0);
			if (dl) {
				VectorCopy (pos, dl->origin);
				dl->radius = 350;
				dl->die = cl.time + 0.5;
				dl->decay = 300;
				dl->color[0] = 0.86;
				dl->color[1] = 0.31;
				dl->color[2] = 0.24;
				dl->color[3] = 0.7;
			}

			// sound
			S_StartSound (-1, 0, cl_sfx_r_exp3, pos, 1, 1);

			// sprite
			ex = CL_AllocExplosion ();
			if (ex->ent.efrag)
				R_RemoveEfrags (&ex->ent);
			VectorCopy (pos, ex->ent.origin);
			ex->start = cl.time;
			//FIXME need better model management
			if (!cl_spr_explod->cache.data)
				cl_spr_explod = Mod_ForName ("progs/s_explod.spr", true);
			ex->ent.model = cl_spr_explod;
			break;

		case TE_TAREXPLOSION:			// tarbaby explosion
			MSG_ReadCoordV (net_message, pos);
			R_BlobExplosion (pos);

			S_StartSound (-1, 0, cl_sfx_r_exp3, pos, 1, 1);
			break;

		case TE_LIGHTNING1:				// lightning bolts
			CL_ParseBeam (cl_mod_bolt);
			break;

		case TE_LIGHTNING2:				// lightning bolts
			CL_ParseBeam (cl_mod_bolt2);
			break;

		case TE_LIGHTNING3:				// lightning bolts
			CL_ParseBeam (cl_mod_bolt3);
			break;

		// PGM 01/21/97
		case TE_BEAM:					// grappling hook beam
			CL_ParseBeam (cl_mod_beam);
			break;
		// PGM 01/21/97

		case TE_LAVASPLASH:
			MSG_ReadCoordV (net_message, pos);
			R_LavaSplash (pos);
			break;

		case TE_TELEPORT:
			MSG_ReadCoordV (net_message, pos);
			R_TeleportSplash (pos);
			break;

		case TE_EXPLOSION2:				// color mapped explosion
			MSG_ReadCoordV (net_message, pos);
			colorStart = MSG_ReadByte (net_message);
			colorLength = MSG_ReadByte (net_message);
			S_StartSound (-1, 0, cl_sfx_r_exp3, pos, 1, 1);
			R_ParticleExplosion2 (pos, colorStart, colorLength);
			dl = R_AllocDlight (0);
			if (!dl)
				break;
			VectorCopy (pos, dl->origin);
			dl->radius = 350;
			dl->die = cl.time + 0.5;
			dl->decay = 300;
			colorStart = (colorStart + (rand () % colorLength)) * 3;
			dl->color[0] = vid.palette[colorStart] * (1.0 / 255.0);
			dl->color[1] = vid.palette[colorStart + 1] * (1.0 / 255.0);
			dl->color[2] = vid.palette[colorStart + 2] * (1.0 / 255.0);
			dl->color[3] = 0.7;
			break;

		case TE_GUNSHOT:				// bullet hitting wall
			cnt = MSG_ReadByte (net_message) * 20;
			MSG_ReadCoordV (net_message, pos);
			R_GunshotEffect (pos, cnt);
			break;

		case TE_BLOOD:					// bullet hitting body
			cnt = MSG_ReadByte (net_message) * 20;
			MSG_ReadCoordV (net_message, pos);
			R_BloodPuffEffect (pos, cnt);
			break;

		case TE_LIGHTNINGBLOOD:			// lightning hitting body
			MSG_ReadCoordV (net_message, pos);

			// light
			dl = R_AllocDlight (0);
			if (dl) {
				VectorCopy (pos, dl->origin);
				dl->radius = 150;
				dl->die = cl.time + 0.1;
				dl->decay = 200;
				dl->color[0] = 0.25;
				dl->color[1] = 0.40;
				dl->color[2] = 0.65;
				dl->color[3] = 1;
			}

			R_LightningBloodEffect (pos);
			break;

		default:
			Sys_Error ("CL_ParseTEnt: bad type %d", type);
	}
}

#define BEAM_SEED_INTERVAL 72
#define BEAM_SEED_PRIME 3191

static void
CL_UpdateBeams (void)
{
	beam_t     *b;
	int         i, ent_count;
	unsigned    seed;

	// update lightning
	for (i = 0, b = cl_beams; i < MAX_BEAMS; i++, b++) {
		if (!b->endtime)
			continue;
		if (!b->model || b->endtime < cl.time) {
			b->endtime = 0;
			beam_clear (b);
			continue;
		}

		// if coming from the player, update the start position
		if (b->entity == cl.viewentity) {
			beam_clear (b);
			VectorCopy (cl.simorg, b->start);
			beam_setup (b);
		}

		seed = b->seed + ((int) (cl.time * BEAM_SEED_INTERVAL) %
						  BEAM_SEED_INTERVAL);

		// add new entities for the lightning
		ent_count = b->ent_count;
		while (ent_count--) {
			seed = seed * BEAM_SEED_PRIME;
			b->ent_list[ent_count].angles[2] = seed % 360;
		}
	}
}

static void
CL_UpdateExplosions (void)
{
	int          f, i;
	explosion_t *ex;

	for (i = 0, ex = cl_explosions; i < MAX_EXPLOSIONS; i++, ex++) {
		if (!ex->ent.model)
			continue;
		f = 10 * (cl.time - ex->start);
		if (f >= ex->ent.model->numframes) {
			R_RemoveEfrags (&ex->ent);
			ex->ent.model = NULL;
			continue;
		}

		ex->ent.frame = f;
		if (!ex->ent.efrag)
			R_AddEfrags (&ex->ent);
	}
}

void
CL_UpdateTEnts (void)
{
	CL_UpdateBeams ();
	CL_UpdateExplosions ();
}