/*
 * 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.
 *
 * =======================================================================
 *
 * This file implements all static entities at client site.
 *
 * =======================================================================
 */

#include "header/client.h"

extern	struct model_s	*cl_mod_powerscreen;
int	vidref_val;

struct model_s *S_RegisterSexedModel (entity_state_t *ent, char *base) {
	int				n;
	char			*p;
	struct model_s	*md2;
	char			model[MAX_QPATH];
	char			buffer[MAX_QPATH];

	/* determine what model the client is using */
	model[0] = 0;
	n = CS_PLAYERSKINS + ent->number - 1;

	if (cl.configstrings[n][0]) {
		p = strchr(cl.configstrings[n], '\\');

		if (p) {
			p += 1;
			strcpy(model, p);
			p = strchr(model, '/');

			if (p)
				*p = 0;
		}
	}

	/* if we can't figure it out, they're male */
	if (!model[0])
		strcpy(model, "male");

	Com_sprintf (buffer, sizeof(buffer), "players/%s/%s", model, base+1);
	md2 = re.RegisterModel(buffer);

	if (!md2) {
		/* not found, try default weapon model */
		Com_sprintf (buffer, sizeof(buffer), "players/%s/weapon.md2", model);
		md2 = re.RegisterModel(buffer);

		if (!md2) {
			/* no, revert to the male model */
			Com_sprintf (buffer, sizeof(buffer), "players/%s/%s", "male", base+1);
			md2 = re.RegisterModel(buffer);

			if (!md2) {
				/* last try, default male weapon.md2 */
				Com_sprintf (buffer, sizeof(buffer), "players/male/weapon.md2");
				md2 = re.RegisterModel(buffer);
			}
		}
	}

	return md2;
}

extern int Developer_searchpath (int who);

void CL_AddPacketEntities (frame_t *frame) {
	entity_t			ent = {0};
	entity_state_t		*s1;
	float				autorotate;
	int					i;
	int					pnum;
	centity_t			*cent;
	int					autoanim;
	clientinfo_t		*ci;
	unsigned int		effects, renderfx;

	/* bonus items rotate at a fixed rate */
	autorotate = anglemod(cl.time*0.1f);

	/* brush models can auto animate their frames */
	autoanim = 2*cl.time/1000;

	for (pnum = 0 ; pnum<frame->num_entities ; pnum++) {
		s1 = &cl_parse_entities[(frame->parse_entities+pnum)&(MAX_PARSE_ENTITIES-1)];

		cent = &cl_entities[s1->number];

		effects = s1->effects;
		renderfx = s1->renderfx;

		/* set frame */
		if (effects & EF_ANIM01)
			ent.frame = autoanim & 1;

		else if (effects & EF_ANIM23)
			ent.frame = 2 + (autoanim & 1);

		else if (effects & EF_ANIM_ALL)
			ent.frame = autoanim;

		else if (effects & EF_ANIM_ALLFAST)
			ent.frame = cl.time / 100;

		else
			ent.frame = s1->frame;

		/* quad and pent can do different things on client */
		if (effects & EF_PENT) {
			effects &= ~EF_PENT;
			effects |= EF_COLOR_SHELL;
			renderfx |= RF_SHELL_RED;
		}

		if (effects & EF_QUAD) {
			effects &= ~EF_QUAD;
			effects |= EF_COLOR_SHELL;
			renderfx |= RF_SHELL_BLUE;
		}

		if (effects & EF_DOUBLE) {
			effects &= ~EF_DOUBLE;
			effects |= EF_COLOR_SHELL;
			renderfx |= RF_SHELL_DOUBLE;
		}

		if (effects & EF_HALF_DAMAGE) {
			effects &= ~EF_HALF_DAMAGE;
			effects |= EF_COLOR_SHELL;
			renderfx |= RF_SHELL_HALF_DAM;
		}

		ent.oldframe = cent->prev.frame;
		ent.backlerp = 1.0f - cl.lerpfrac;

		if (renderfx & (RF_FRAMELERP|RF_BEAM)) {
			/* step origin discretely, because the frames
			 * do the animation properly */
			VectorCopy (cent->current.origin, ent.origin);
			VectorCopy (cent->current.old_origin, ent.oldorigin);

		} else {
			/* interpolate origin */
			for (i=0 ; i<3 ; i++) {
				ent.origin[i] = ent.oldorigin[i] = cent->prev.origin[i] + cl.lerpfrac *
				                                   (cent->current.origin[i] - cent->prev.origin[i]);
			}
		}

		/* tweak the color of beams */
		if ( renderfx & RF_BEAM ) {
			/* the four beam colors are encoded in 32 bits of skinnum (hack) */
			ent.alpha = 0.30f;
			ent.skinnum = (s1->skinnum >> ((randk() % 4)*8)) & 0xff;
			ent.model = NULL;

		} else {
			/* set skin */
			if (s1->modelindex == 255) {
				/* use custom player skin */
				ent.skinnum = 0;
				ci = &cl.clientinfo[s1->skinnum & 0xff];
				ent.skin = ci->skin;
				ent.model = ci->model;

				if (!ent.skin || !ent.model) {
					ent.skin = cl.baseclientinfo.skin;
					ent.model = cl.baseclientinfo.model;
				}

				if (renderfx & RF_USE_DISGUISE) {
					if (ent.skin != NULL) {
						if(!strncmp((char *)ent.skin, "players/male", 12)) {
							ent.skin = re.RegisterSkin ("players/male/disguise.pcx");
							ent.model = re.RegisterModel ("players/male/tris.md2");

						} else if(!strncmp((char *)ent.skin, "players/female", 14)) {
							ent.skin = re.RegisterSkin ("players/female/disguise.pcx");
							ent.model = re.RegisterModel ("players/female/tris.md2");

						} else if(!strncmp((char *)ent.skin, "players/cyborg", 14)) {
							ent.skin = re.RegisterSkin ("players/cyborg/disguise.pcx");
							ent.model = re.RegisterModel ("players/cyborg/tris.md2");
						}
					}
				}

			} else {
				ent.skinnum = s1->skinnum;
				ent.skin = NULL;
				ent.model = cl.model_draw[s1->modelindex];
			}
		}

		/* only used for black hole model right now */
		if (renderfx & RF_TRANSLUCENT && !(renderfx & RF_BEAM))
			ent.alpha = 0.70f;

		/* render effects (fullbright, translucent, etc) */
		if ((effects & EF_COLOR_SHELL))
			ent.flags = 0;	/* renderfx go on color shell entity */

		else
			ent.flags = renderfx;

		/* calculate angles */
		if (effects & EF_ROTATE) {
			/* some bonus items auto-rotate */
			ent.angles[0] = 0;
			ent.angles[1] = autorotate;
			ent.angles[2] = 0;

		} else if (effects & EF_SPINNINGLIGHTS) {
			ent.angles[0] = 0;
			ent.angles[1] = anglemod(cl.time/2) + s1->angles[1];
			ent.angles[2] = 180;
			{
				vec3_t forward;
				vec3_t start;

				AngleVectors (ent.angles, forward, NULL, NULL);
				VectorMA (ent.origin, 64, forward, start);
				V_AddLight (start, 100, 1, 0, 0);
			}

		} else {
			/* interpolate angles */
			float	a1, a2;

			for (i=0 ; i<3 ; i++) {
				a1 = cent->current.angles[i];
				a2 = cent->prev.angles[i];
				ent.angles[i] = LerpAngle (a2, a1, cl.lerpfrac);
			}
		}

		if (s1->number == cl.playernum+1) {
			ent.flags |= RF_VIEWERMODEL;

			if (effects & EF_FLAG1)
				V_AddLight (ent.origin, 225, 1.0f, 0.1f, 0.1f);

			else if (effects & EF_FLAG2)
				V_AddLight (ent.origin, 225, 0.1f, 0.1f, 1.0f);

			else if (effects & EF_TAGTRAIL)
				V_AddLight (ent.origin, 225, 1.0f, 1.0f, 0.0f);

			else if (effects & EF_TRACKERTRAIL)
				V_AddLight (ent.origin, 225, -1.0f, -1.0f, -1.0f);

			continue;
		}

		/* if set to invisible, skip */
		if (!s1->modelindex)
			continue;

		if (effects & EF_BFG) {
			ent.flags |= RF_TRANSLUCENT;
			ent.alpha = 0.30f;
		}

		if (effects & EF_PLASMA) {
			ent.flags |= RF_TRANSLUCENT;
			ent.alpha = 0.6f;
		}

		if (effects & EF_SPHERETRANS) {
			ent.flags |= RF_TRANSLUCENT;

			if (effects & EF_TRACKERTRAIL)
				ent.alpha = 0.6f;

			else
				ent.alpha = 0.3f;
		}

		/* add to refresh list */
		V_AddEntity (&ent);


		/* color shells generate a seperate entity for the main model */
		if (effects & EF_COLOR_SHELL) {
			/* all of the solo colors are fine.  we need to catch any of
			 * the combinations that look bad (double & half) and turn
			 * them into the appropriate color, and make double/quad
			 * something special */
			if (renderfx & RF_SHELL_HALF_DAM) {
				if(Developer_searchpath(2) == 2) {
					/* ditch the half damage shell if any of red, blue, or double are on */
					if (renderfx & (RF_SHELL_RED|RF_SHELL_BLUE|RF_SHELL_DOUBLE))
						renderfx &= ~RF_SHELL_HALF_DAM;
				}
			}

			if (renderfx & RF_SHELL_DOUBLE) {
				if(Developer_searchpath(2) == 2) {
					/* lose the yellow shell if we have a red, blue, or green shell */
					if (renderfx & (RF_SHELL_RED|RF_SHELL_BLUE|RF_SHELL_GREEN))
						renderfx &= ~RF_SHELL_DOUBLE;

					/* if we have a red shell, turn it to purple by adding blue */
					if (renderfx & RF_SHELL_RED)
						renderfx |= RF_SHELL_BLUE;

					/* if we have a blue shell (and not a red shell), turn it to cyan by adding green */
					else if (renderfx & RF_SHELL_BLUE) {
						/* go to green if it's on already, otherwise do cyan (flash green) */
						if (renderfx & RF_SHELL_GREEN)
							renderfx &= ~RF_SHELL_BLUE;

						else
							renderfx |= RF_SHELL_GREEN;
					}
				}
			}

			ent.flags = renderfx | RF_TRANSLUCENT;
			ent.alpha = 0.30f;
			V_AddEntity (&ent);
		}

		ent.skin = NULL; /* never use a custom skin on others */
		ent.skinnum = 0;
		ent.flags = 0;
		ent.alpha = 0;

		/* duplicate for linked models */
		if (s1->modelindex2) {
			if (s1->modelindex2 == 255) {
				/* custom weapon */
				ci = &cl.clientinfo[s1->skinnum & 0xff];
				i = (s1->skinnum >> 8); /* 0 is default weapon model */

				if (!cl_vwep->value || i > MAX_CLIENTWEAPONMODELS - 1)
					i = 0;

				ent.model = ci->weaponmodel[i];

				if (!ent.model) {
					if (i != 0)
						ent.model = ci->weaponmodel[0];

					if (!ent.model)
						ent.model = cl.baseclientinfo.weaponmodel[0];
				}

			} else
				ent.model = cl.model_draw[s1->modelindex2];

			/* check for the defender sphere shell and make it translucent */
			if (!Q_strcasecmp (cl.configstrings[CS_MODELS+(s1->modelindex2)], "models/items/shell/tris.md2")) {
				ent.alpha = 0.32f;
				ent.flags = RF_TRANSLUCENT;
			}

			V_AddEntity (&ent);

			ent.flags = 0;
			ent.alpha = 0;
		}

		if (s1->modelindex3) {
			ent.model = cl.model_draw[s1->modelindex3];
			V_AddEntity (&ent);
		}

		if (s1->modelindex4) {
			ent.model = cl.model_draw[s1->modelindex4];
			V_AddEntity (&ent);
		}

		if ( effects & EF_POWERSCREEN ) {
			ent.model = cl_mod_powerscreen;
			ent.oldframe = 0;
			ent.frame = 0;
			ent.flags |= (RF_TRANSLUCENT | RF_SHELL_GREEN);
			ent.alpha = 0.30f;
			V_AddEntity (&ent);
		}

		/* add automatic particle trails */
		if ( (effects&~EF_ROTATE) ) {
			if (effects & EF_ROCKET) {
				CL_RocketTrail (cent->lerp_origin, ent.origin, cent);
				V_AddLight (ent.origin, 200, 1, 0.25f, 0);
			}

			/* Do not reorder EF_BLASTER and EF_HYPERBLASTER.
			 * EF_BLASTER | EF_TRACKER is a special case for
			 * EF_BLASTER2 */
			else if (effects & EF_BLASTER) {
				if (effects & EF_TRACKER) {
					CL_BlasterTrail2 (cent->lerp_origin, ent.origin);
					V_AddLight (ent.origin, 200, 0, 1, 0);

				} else {
					CL_BlasterTrail (cent->lerp_origin, ent.origin);
					V_AddLight (ent.origin, 200, 1, 1, 0);
				}

			} else if (effects & EF_HYPERBLASTER) {
				if (effects & EF_TRACKER)
					V_AddLight (ent.origin, 200, 0, 1, 0);

				else
					V_AddLight (ent.origin, 200, 1, 1, 0);

			} else if (effects & EF_GIB) {
				CL_DiminishingTrail (cent->lerp_origin, ent.origin, cent, effects);

			} else if (effects & EF_GRENADE) {
				CL_DiminishingTrail (cent->lerp_origin, ent.origin, cent, effects);

			} else if (effects & EF_FLIES) {
				CL_FlyEffect (cent, ent.origin);

			} else if (effects & EF_BFG) {
				static int bfg_lightramp[6] = {300, 400, 600, 300, 150, 75};

				if (effects & EF_ANIM_ALLFAST) {
					CL_BfgParticles (&ent);
					i = 200;

				} else {
					i = bfg_lightramp[s1->frame];
				}

				V_AddLight (ent.origin, i, 0, 1, 0);

			} else if (effects & EF_TRAP) {
				ent.origin[2] += 32;
				CL_TrapParticles (&ent);
				i = (randk()%100) + 100;
				V_AddLight (ent.origin, i, 1, 0.8f, 0.1f);

			} else if (effects & EF_FLAG1) {
				CL_FlagTrail (cent->lerp_origin, ent.origin, 242);
				V_AddLight (ent.origin, 225, 1, 0.1f, 0.1f);

			} else if (effects & EF_FLAG2) {
				CL_FlagTrail (cent->lerp_origin, ent.origin, 115);
				V_AddLight (ent.origin, 225, 0.1f, 0.1f, 1);

			} else if (effects & EF_TAGTRAIL) {
				CL_TagTrail (cent->lerp_origin, ent.origin, 220);
				V_AddLight (ent.origin, 225, 1.0, 1.0, 0.0);

			} else if (effects & EF_TRACKERTRAIL) {
				if (effects & EF_TRACKER) {
					float intensity;

					intensity = 50 + (500 * ((float)sin(cl.time/500.0f) + 1.0f));

					if(vidref_val == VIDREF_GL)
						V_AddLight (ent.origin, intensity, -1.0, -1.0, -1.0);

					else
						V_AddLight (ent.origin, -1.0f * intensity, 1.0f, 1.0f, 1.0f);

				} else {
					CL_Tracker_Shell (cent->lerp_origin);
					V_AddLight (ent.origin, 155, -1.0, -1.0, -1.0);
				}

			} else if (effects & EF_TRACKER) {
				CL_TrackerTrail (cent->lerp_origin, ent.origin, 0);

				if(vidref_val == VIDREF_GL)
					V_AddLight (ent.origin, 200, -1, -1, -1);

				else
					V_AddLight (ent.origin, -200, 1, 1, 1);

			} else if (effects & EF_IONRIPPER) {
				CL_IonripperTrail (cent->lerp_origin, ent.origin);
				V_AddLight (ent.origin, 100, 1, 0.5, 0.5);

			} else if (effects & EF_BLUEHYPERBLASTER) {
				V_AddLight (ent.origin, 200, 0, 0, 1);

			} else if (effects & EF_PLASMA) {
				if (effects & EF_ANIM_ALLFAST) {
					CL_BlasterTrail (cent->lerp_origin, ent.origin);
				}

				V_AddLight (ent.origin, 130, 1, 0.5, 0.5);
			}
		}

		VectorCopy (ent.origin, cent->lerp_origin);
	}
}

void CL_AddViewWeapon (player_state_t *ps, player_state_t *ops) {
	entity_t	gun = {0}; /* view model */
	int			i;

	/* allow the gun to be completely removed */
	if (!cl_gun->value)
		return;

	/* don't draw gun if in wide angle view and drawing not forced */
	if (ps->fov > 90)
		if (cl_gun->value < 2)
			return;

	if (gun_model)
		gun.model = gun_model;

	else
		gun.model = cl.model_draw[ps->gunindex];

	if (!gun.model)
		return;

	/* set up gun position */
	for (i=0 ; i<3 ; i++) {
		gun.origin[i] = cl.refdef.vieworg[i] + ops->gunoffset[i]
		                + cl.lerpfrac * (ps->gunoffset[i] - ops->gunoffset[i]);
		gun.angles[i] = cl.refdef.viewangles[i] + LerpAngle (ops->gunangles[i],
		                ps->gunangles[i], cl.lerpfrac);
	}

	if (gun_frame) {
		gun.frame = gun_frame;
		gun.oldframe = gun_frame;

	} else {
		gun.frame = ps->gunframe;

		if (gun.frame == 0)
			gun.oldframe = 0; /* just changed weapons, don't lerp from old */

		else
			gun.oldframe = ops->gunframe;
	}

	gun.flags = RF_MINLIGHT | RF_DEPTHHACK | RF_WEAPONMODEL;
	gun.backlerp = 1.0f - cl.lerpfrac;
	VectorCopy (gun.origin, gun.oldorigin);	/* don't lerp at all */
	V_AddEntity (&gun);
}

/*
 * Sets cl.refdef view values
 */
void CL_CalcViewValues (void) {
	int			i;
	float		lerp, backlerp;
	frame_t		*oldframe;
	player_state_t	*ps, *ops;

	/* find the previous frame to interpolate from */
	ps = &cl.frame.playerstate;
	i = (cl.frame.serverframe - 1) & UPDATE_MASK;
	oldframe = &cl.frames[i];

	if (oldframe->serverframe != cl.frame.serverframe-1 || !oldframe->valid)
		oldframe = &cl.frame; /* previous frame was dropped or invalid */

	ops = &oldframe->playerstate;

	/* see if the player entity was teleported this frame */
	if ( fabs(ops->pmove.origin[0] - ps->pmove.origin[0]) > 256*8
	        || abs(ops->pmove.origin[1] - ps->pmove.origin[1]) > 256*8
	        || abs(ops->pmove.origin[2] - ps->pmove.origin[2]) > 256*8)
		ops = ps;  /* don't interpolate */

	lerp = cl.lerpfrac;

	/* calculate the origin */
	if ((cl_predict->value) && !(cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION)) {
		/* use predicted values */
		unsigned	delta;

		backlerp = 1.0f - lerp;

		for (i=0 ; i<3 ; i++) {
			cl.refdef.vieworg[i] = cl.predicted_origin[i] + ops->viewoffset[i]
			                       + cl.lerpfrac * (ps->viewoffset[i] - ops->viewoffset[i])
			                       - backlerp * cl.prediction_error[i];
		}

		/* smooth out stair climbing */
		delta = cls.realtime - cl.predicted_step_time;

		if (delta < 100)
			cl.refdef.vieworg[2] -= cl.predicted_step * (100 - delta) * 0.01;

	} else {
		/* just use interpolated values */
		for (i=0 ; i<3 ; i++)
			cl.refdef.vieworg[i] = ops->pmove.origin[i]*0.125 + ops->viewoffset[i]
			                       + lerp * (ps->pmove.origin[i]*0.125 + ps->viewoffset[i]
			                                 - (ops->pmove.origin[i]*0.125 + ops->viewoffset[i]) );
	}

	/* if not running a demo or on a locked frame, add the local angle movement */
	if ( cl.frame.playerstate.pmove.pm_type < PM_DEAD ) {
		/* use predicted values */
		for (i=0 ; i<3 ; i++)
			cl.refdef.viewangles[i] = cl.predicted_angles[i];

	} else {
		/* just use interpolated values */
		for (i=0 ; i<3 ; i++)
			cl.refdef.viewangles[i] = LerpAngle (ops->viewangles[i], ps->viewangles[i], lerp);
	}

	for (i=0 ; i<3 ; i++)
		cl.refdef.viewangles[i] += LerpAngle (ops->kick_angles[i], ps->kick_angles[i], lerp);

	AngleVectors (cl.refdef.viewangles, cl.v_forward, cl.v_right, cl.v_up);

	/* interpolate field of view */
	cl.refdef.fov_x = ops->fov + lerp * (ps->fov - ops->fov);

	/* don't interpolate blend color */
	for (i=0 ; i<4 ; i++)
		cl.refdef.blend[i] = ps->blend[i];

	/* add the weapon */
	CL_AddViewWeapon (ps, ops);
}

/*
 * Emits all entities, particles, and lights to the refresh
 */
void CL_AddEntities (void) {
	if (cls.state != ca_active)
		return;

	if (cl.time > cl.frame.servertime) {
		if (cl_showclamp->value)
			Com_Printf ("high clamp %i\n", cl.time - cl.frame.servertime);

		cl.time = cl.frame.servertime;
		cl.lerpfrac = 1.0;

	} else if (cl.time < cl.frame.servertime - 100) {
		if (cl_showclamp->value)
			Com_Printf ("low clamp %i\n", cl.frame.servertime-100 - cl.time);

		cl.time = cl.frame.servertime - 100;
		cl.lerpfrac = 0;

	} else
		cl.lerpfrac = 1.0 - (cl.frame.servertime - cl.time) * 0.01f;

	if (cl_timedemo->value)
		cl.lerpfrac = 1.0;

	CL_CalcViewValues ();
	CL_AddPacketEntities (&cl.frame);
	CL_AddTEnts ();
	CL_AddParticles ();
	CL_AddDLights ();
	CL_AddLightStyles ();
}

/*
 * Called to get the sound spatialization origin
 */
void CL_GetEntitySoundOrigin (int ent, vec3_t org) {
	centity_t	*old;

	if (ent < 0 || ent >= MAX_EDICTS)
		Com_Error (ERR_DROP, "CL_GetEntitySoundOrigin: bad ent");

	old = &cl_entities[ent];
	VectorCopy (old->lerp_origin, org);
}