/*
 * Copyright (C) 1999-2000 Id Software, Inc.
 */

#include "g_trigger.h"
#include "g_local.h"
#include "g_spawn.h"
#include "g_client.h"
#include "g_lua.h"
#include "g_logger.h"
#include "g_syscalls.h"

enum g_triggerLimits_e {
	MAX_TRANSPORTER_POINTS = 16
};

void G_Trigger_Init(gentity_t* self) {
	G_LogFuncBegin();

	if (VectorCompare(self->s.angles, vec3_origin) == 0) {
		G_SetMovedir(self->s.angles, self->movedir);
	}

	if (!self->tmpEntity) {
		/* for spawnTent command */
		trap_SetBrushModel(self, self->model);
	}
	self->r.contents = CONTENTS_TRIGGER;		/* replaces the -1 from trap_SetBrushModel */
	self->r.svFlags = SVF_NOCLIENT;

	G_LogFuncEnd();
}

/**
 * @brief Reactivate a trigger_multiple after the wait time has passed.
 *
 * Reactivates the trigger_multiple after the wait time has passed.
 *
 * @param ent the trigger
 */
static void multi_wait(gentity_t* ent) {
	G_LogFuncBegin();

	ent->nextthink = 0;

	G_LogFuncEnd();
}

/**
 * @brief Function that gets called when a trigger_multiple has been ... umm well triggered ;)
 *
 * The trigger_multiple was just activated. ent->activator should be set to the activator
 * so it can be held through a delay. May wait for the delay time until firing.
 *
 * @param ent the trigger
 * @param activator the activator
 */
static void multi_trigger(gentity_t* ent, gentity_t* activator) {
	ent->activator = activator;

	G_LogFuncBegin();

	if (ent->nextthink != 0) {
		G_LocLogger(LL_DEBUG, "multi_trigger called before wait was over\n");
		G_LogFuncEnd();
		return;		/* can't retrigger until the wait is over */
	}

	if ((activator->client != NULL) && (((ent->spawnflags & 4) != 0) || ((ent->spawnflags & 2) != 0) || ((ent->spawnflags & 1) != 0)))
	{
		/* see if it's usable by this team */
		switch (activator->client->sess.sessionTeam)
		{
		case TEAM_RED:
			if ((ent->spawnflags & 1) == 0) {
				return; /* red is not allowed */
			}
			break;
		case TEAM_BLUE:
			if ((ent->spawnflags & 2) == 0) {
				return; /* blue is not allowed */
			}
			break;
		default:
			if ((ent->spawnflags & 4) != 0) {
				return; /* must be on a team */
			}
			break;
		}
	}

	G_UseTargets(ent, ent->activator);

#ifdef G_LUA
	if ((ent->luaTrigger != NULL) && (ent->nextthink != 0))
	{
		if (activator != NULL)
		{
			LuaHook_G_EntityTrigger(ent->luaTrigger, ent->s.number, activator->s.number);
		}
		else
		{
			LuaHook_G_EntityTrigger(ent->luaTrigger, ent->s.number, ENTITYNUM_WORLD);
		}
	}
#endif

	if (ent->wait > 0) {
		ent->think = multi_wait;
		ent->nextthink = level.time + (ent->wait + ent->random * crandom()) * 1000;
	}
	else {
		/*
		 *  we can't just remove (self) here, because this is a touch function
		 *  called while looping through area links...
		 */
		ent->touch = 0;
		ent->nextthink = level.time + FRAMETIME;
		ent->think = G_FreeEntity;
	}

	G_LogFuncEnd();
}

/**
 * @brief Use function for trigger_multiple.
 *
 * @param ent the trigger
 * @param other another entity
 * @param activator the activator
 */
static void Use_Multi(gentity_t* ent, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	multi_trigger(ent, activator);

	G_LogFuncEnd();
}

/**
 * @brief Touch function for trigger_multiple.
 *
 * @param self the trigger
 * @param other touching entity
 * @param trace a trace
 */
void Touch_Multi(gentity_t* self, gentity_t* other, trace_t* trace) {
	G_LogFuncBegin();

	if (other->client == NULL) {
		G_LocLogger(LL_DEBUG, "other->client is NULL\n");
		G_LogFuncEnd();
		return;
	}

	multi_trigger(self, other);

	G_LogFuncEnd();
}

/*QUAKED trigger_multiple (.5 .5 .5) ? RED_OK BLUE_OK TEAM_ONLY
-----DESCRIPTION-----
Variable sized repeatable trigger.  Must be targeted at one or more entities.

-----SPAWNFLAGS-----
1: RED_OK - People on the red team can fire this trigger
2: BLUE_OK - People on the blue team can fire this trigger
4: TEAM_ONLY - Only people on red or blue can fire this trigger (not TEAM_FREE like in straight holomatch or spectators)

-----KEYS-----
"wait" - Seconds between triggerings, 0.5 default, -1 = one time only.
"random" - wait variance, default is 0
so, the basic time between firing is a random time between
(wait - random) and (wait + random)
*/
void SP_trigger_multiple(gentity_t *ent) {
	G_LogFuncBegin();

	ent->type = EntityType::ENT_TRIGGER_MULTIPLE;

	G_SpawnFloat("wait", "0.5", &ent->wait);
	G_SpawnFloat("random", "0", &ent->random);

	G_SetOrigin(ent, ent->s.origin);

	if (ent->random >= ent->wait && ent->wait >= 0) {
		ent->random = ent->wait - FRAMETIME;
		G_LocLogger(LL_WARN, "trigger_multiple has random >= wait\n");
	}

	ent->touch = Touch_Multi;
	ent->use = Use_Multi;

	G_Trigger_Init(ent);

	VectorCopy(ent->r.maxs, ent->s.origin2);
	VectorCopy(ent->r.mins, ent->s.angles2);

	trap_LinkEntity(ent);

	level.numBrushEnts++;

	G_LogFuncEnd();
}



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

trigger_always

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

/**
 * @brief Think function of trigger_always.
 *
 * Think function of trigger_always.
 *
 * @param ent the trigger
 */
static void trigger_always_think(gentity_t* ent) {
	G_LogFuncBegin();

	G_UseTargets(ent, ent);

#ifdef G_LUA
	if (ent->luaTrigger != NULL)
	{
		LuaHook_G_EntityTrigger(ent->luaTrigger, ent->s.number, ent->s.number);
	}
#endif

	G_FreeEntity(ent);

	G_LogFuncEnd();
}

/*QUAKED trigger_always (.5 .5 .5) (-8 -8 -8) (8 8 8)
-----DESCRIPTION-----
This trigger will always fire.  It is activated by the world.
Actually this is going to fire once 0.3 secs after spawn, so it's more a trigger_init.

-----SPAWNFLAGS-----
none

-----KEYS-----
"target" - targets to fire
*/
void SP_trigger_always(gentity_t* ent) {
	G_LogFuncBegin();

	ent->type = EntityType::ENT_TRIGGER_ALWAYS;

	/* we must have some delay to make sure our use targets are present */
	ent->nextthink = level.time + 300;
	ent->think = trigger_always_think;

	G_LogFuncEnd();
}


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

trigger_push

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

/**
 * @brief Touch function of trigger_push.
 *
 * Touch function of trigger_push.
 *
 * @param self the trigger
 * @param other the touching entity
 * @param trace a trace
 */
static void trigger_push_touch(gentity_t* self, gentity_t* other, trace_t* trace) {
	G_LogFuncBegin();

	if (other->client == NULL) {
		G_LocLogger(LL_DEBUG, "other->client is NULL\n");
		G_LogFuncEnd();
		return;
	}

	if (other->client->ps.velocity[2] < 100) {
		/* don't play the event sound again if we are in a fat trigger */
		G_AddPredictableEvent(other, EV_JUMP_PAD, 0);
	}
	VectorCopy(self->s.origin2, other->client->ps.velocity);

	G_LogFuncEnd();
}


/**
 * @brief Calculate origin2 so the target apogee will be hit.
 *
 * Calculate origin2 so the target apogee will be hit.
 *
 * @param the trigger
 */
static void AimAtTarget(gentity_t* self) {
	gentity_t	*ent = NULL;
	vec3_t		origin = { 0, 0, 0 };
	double		height = 0;
	double		gravity = 0;
	double		time = 0;
	double		forward = 0;
	double		dist = 0;

	G_LogFuncBegin();

	VectorAdd(self->r.absmin, self->r.absmax, origin);
	VectorScale(origin, 0.5, origin);

	ent = G_PickTarget(self->target);
	if (ent == NULL) {
		G_LocLogger(LL_ERROR, "Could not spawn new entity!\n");
		G_FreeEntity(self);
		G_LogFuncEnd();
		return;
	}

	height = ent->s.origin[2] - origin[2];
	gravity = g_gravity.value;
	time = sqrt(height / (.5 * gravity));
	if (time <= 0) {
		G_LocLogger(LL_ERROR, "time <= 0\n");
		G_FreeEntity(self);
		G_LogFuncEnd();
		return;
	}

	/* set s.origin2 to the push velocity */
	VectorSubtract(ent->s.origin, origin, self->s.origin2);
	self->s.origin2[2] = 0;
	dist = VectorNormalize(self->s.origin2);

	forward = dist / time;
	VectorScale(self->s.origin2, forward, self->s.origin2);

	self->s.origin2[2] = time * gravity;

	G_LogFuncEnd();
}


/*QUAKED trigger_push (.5 .5 .5) ?
-----DESCRIPTION-----
Jumpfield/Booster Effect predicted on client side. This is activated by touch function.

-----SPAWNFLAGS-----
None

-----KEYS-----
"target" - apex of the leap. Must be a target_position or info_notnull.
*/
void SP_trigger_push(gentity_t* self) {
	G_LogFuncBegin();

	self->type = EntityType::ENT_TRIGGER_PUSH;

	G_Trigger_Init(self);

	/* unlike other triggers, we need to send this one to the client */
	self->r.svFlags &= ~SVF_NOCLIENT;

	self->s.eType = ET_PUSH_TRIGGER;
	self->touch = trigger_push_touch;
	self->think = AimAtTarget;
	self->nextthink = level.time + FRAMETIME;
	trap_LinkEntity(self);

	VectorCopy(self->r.maxs, self->s.apos.trBase);
	VectorCopy(self->r.mins, self->s.pos.trBase);

	level.numBrushEnts++;

	G_LogFuncEnd();
}

/**
 * @brief Use function of target_push.
 *
 * @param self the entity
 * @param other another entity
 * @param activator the activator
 */
static void Use_target_push(gentity_t* self, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	if (activator->client == NULL) {
		G_LocLogger(LL_DEBUG, "activator->client is NULL\n");
		G_LogFuncEnd();
		return;
	}

	/* RPG-X: J2J noclip use */
	if ((activator->client->ps.pm_type != PM_NORMAL) || (activator->client->ps.pm_type != PM_NOCLIP)) {
		G_LocLogger(LL_DEBUG, "noclip in use\n");
		G_LogFuncEnd();
		return;
	}

	if (activator->client->ps.powerups[PW_FLIGHT]) {
		G_LocLogger(LL_DEBUG, "flight in use\n");
		G_LogFuncEnd();
		return;
	}

	VectorCopy(self->s.origin2, activator->client->ps.velocity);

	/* play fly sound every 1.5 seconds */
	if (activator->fly_sound_debounce_time < level.time) {
		activator->fly_sound_debounce_time = level.time + 1500;
		G_Sound(activator, self->noise_index);
	}

	G_LogFuncEnd();
}

/*QUAKED target_push (.5 .5 .5) (-8 -8 -8) (8 8 8) ENERGYNOISE
-----DESCRIPTION-----
Pushes the activator in the direction of angle, or towards a target apex.
This is predicted on the serverside and is triggered by use-function.

-----SPAWNFLAGS-----
1: ENERGYNOISE - play energy noise instead of windfly

-----KEYS-----
"speed" - defaults to 1000
"target" - apex of the leap. Must be a target_position or info_notnull.
*/
void SP_target_push(gentity_t* self) {
	G_LogFuncBegin();

	self->type = EntityType::ENT_TARGET_PUSH;

	if (self->speed <= 0) {
		self->speed = 1000;
	}

	G_SetMovedir(self->s.angles, self->s.origin2);
	VectorScale(self->s.origin2, self->speed, self->s.origin2);

	if (self->spawnflags & 1) {
		self->noise_index = G_SoundIndex("sound/ambience/forge/antigrav.wav");
	}
	else {
		self->noise_index = G_SoundIndex("sound/misc/windfly.wav");	/* fixme need sound! */
	}
	if (self->target) {
		VectorCopy(self->s.origin, self->r.absmin);
		VectorCopy(self->s.origin, self->r.absmax);
		self->think = AimAtTarget;
		self->nextthink = level.time + FRAMETIME;
	}
	self->use = Use_target_push;

	G_LogFuncEnd();
}

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

trigger_teleport

==============================================================================
*/
gentity_t* SelectRandomSpawnPoint(void)
{
	gentity_t*	spot = NULL;
	int			count = 0;
	int			selection = 0;
	gentity_t*	spots[MAX_TRANSPORTER_POINTS];
	char*		classname;

	G_LogFuncBegin();

	classname = "info_player_deathmatch";

	while ((spot = G_Find(spot, FOFS(classname), classname)) != NULL)
	{
		spots[count++] = spot;
		if (count == MAX_TRANSPORTER_POINTS)
		{
			break;
		}
	}

	if (count == 0)
	{	/* no spawn points !!??! */
		G_LocLogger(LL_ERROR, "no spawn points found!\n");
		G_LogFuncEnd();
		return NULL;
	}

	selection = rand() % count;
	G_LogFuncEnd();
	return spots[selection];
}

/**
 * @brief Touch function of trigger_teleport.
 *
 * @param self the trigger
 * @param other the touching entity
 * @param trace a trace
 */
static void trigger_teleporter_touch(gentity_t* self, gentity_t* other, trace_t* trace)
{
	gentity_t*	dest = NULL;
	vec3_t		destPoint = { 0, 0, 0 };
	trace_t		tr;
	vec3_t		tracePoint = { 0, 0, 0 };
	int			clientNum = 0;

	G_LogFuncBegin();

	if ((self->flags & FL_LOCKED) != 0) {
		G_LocLogger(LL_DEBUG, "locked");
		G_LogFuncEnd();
		return;
	}

	if (other->client == NULL) {
		G_LocLogger(LL_DEBUG, "other->client is NULL\n");
		G_LogFuncEnd();
		return;
	}
	if (other->client->ps.pm_type == PM_DEAD) {
		G_LocLogger(LL_DEBUG, "other->client is dead\n");
		G_LogFuncEnd();
		return;
	}
	/* Spectators only? */
	if (((self->spawnflags & 1) != 0) &&
		other->client->sess.sessionTeam != TEAM_SPECTATOR)
	{
		G_LocLogger(LL_DEBUG, "other->client is spectator\n");
		G_LogFuncEnd();
		return;
	}

	clientNum = other->client->ps.clientNum;

	/* BOOKMARK J2J */
	if ((self->spawnflags & 2) != 0) {
		/* find a random spawn point */
		dest = SelectRandomSpawnPoint();
	}
	else {
		dest = G_PickTarget(self->target);
	}

	if (dest == NULL)
	{
		G_LocLogger(LL_ERROR, "Couldn't find teleporter destination\n");
		G_LogFuncEnd();
		return;
	}

	/* suspended */
	if ((self->spawnflags & 8) != 0)
	{
		/* put the bottom of the player's bbox at the bottom of the target's bbox */
		VectorCopy(dest->s.origin, destPoint);
		destPoint[2] += dest->r.mins[2];
		destPoint[2] -= other->r.mins[2];
		/* fudge it upwards just a bit */
		destPoint[2] += 1;
	}
	else
	{
		VectorCopy(dest->s.origin, tracePoint);
		tracePoint[2] -= 4096.0f;

		trap_Trace(&tr, dest->s.origin, dest->r.mins, dest->r.maxs, tracePoint, dest->s.number, MASK_PLAYERSOLID);
		VectorCopy(tr.endpos, destPoint);

		/* offset the player's bounding box. */
		destPoint[2] += dest->r.mins[2];
		destPoint[2] -= other->r.mins[2];

		/* add 1 to ensure non-direct collision */
		destPoint[2] += 1;
	}

	if (self->health != 0)
	{
		/*
		 * TiM - Transporter VFX
		 * Only if no spitting though. Having spitting transporter with these VFX would look freaky weird
		 */
		if (self->health == -1 && (self->spawnflags & 4)) {
			if (TransDat[clientNum].beamTime == 0) {
				G_InitTransport(clientNum, destPoint, dest->s.angles);
			}
		}
		else {
			TransportPlayer(other, destPoint, dest->s.angles, (self->health == -1) ? 0 : self->health);
		}
	}
	else
	{
		/* Transporter VFX */
		if (self->spawnflags & 4) {
			if (TransDat[clientNum].beamTime == 0) {
				G_InitTransport(clientNum, destPoint, dest->s.angles);
			}
		}
		else {
			TeleportPlayer(other, destPoint, dest->s.angles, TP_NORMAL);
		}
	}

	if (self->sound1to2 && self->wait && !(self->flags & FL_CLAMPED)) {
		G_AddEvent(self, EV_GENERAL_SOUND, self->sound1to2);
		self->flags ^= FL_CLAMPED;
	}

	G_LogFuncEnd();
}

/**
 * @brief Think function of trigger_teleport.
 *
 * @param ent the trigger
 */
static void trigger_teleport_think(gentity_t* ent) {
	G_LogFuncBegin();

	ent->nextthink = -1;
	if ((ent->flags & FL_LOCKED) == 0) {
		ent->flags ^= FL_LOCKED;
	}

	if (ent->wait > 0 && ((ent->flags & FL_CLAMPED) != 0)) {
		ent->flags ^= FL_CLAMPED;
	}

	G_LogFuncEnd();
}

/**
 * @brief Use function of trigger_teleport.
 *
 * @param ent the trigger
 * @param other another entity
 * @param activator the activator
 */
static void trigger_teleport_use(gentity_t* ent, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	if (Q_stricmp(ent->swapname, activator->target) == 0) {

		if (ent->flags & FL_LOCKED) {
			ent->nextthink = level.time + (ent->wait * 1000);
		}

		ent->flags ^= FL_LOCKED;
	}

	G_LogFuncEnd();
}


/*QUAKED trigger_teleport (.5 .5 .5) ? SPECTATOR RANDOM VISUAL_FX SUSPENDED DEACTIVATED
-----DESCRIPTION-----
Allows client side prediction of teleportation events.
Must point at a target_position or info_notnull, which will be the teleport destination.

-----SPAWNFLAGS-----
1: SPECTATOR: If set, only spectators can use this teleport.
Spectator teleporters are not normally placed in the editor, but are created
automatically near doors to allow spectators to move through them.
2: RANDOM: send player to random info_player_deathmatch spawn point
4: VISUAL_FX: plays the Star Trek transporter FX and beams the player out slowly
8: SUSPENDED: player appears with the bounding box aligned to the bottom of the target
If this isn't set, the player materializes at the first solid surface under it
16: DEACTIVATED: Spawns deactivated

-----KEYS-----
"swapname" - ACTIVATE/DEACTIVATE (Using entity needs SELF/NOACTIVATOR)
"wait" - time before trigger deactivates itself automatically
"soundstart" - sound to play if triggered
"health" - default is original behavior (speed of 400), any other value will be the
speed at which the player is spewed forth from the tranpsorter destination. -1
if you want no speed. The transporter VISUAL_FX flag will only work if the health
is set to 0 or -1 as it cannot support 'spewing'.
*/
void SP_trigger_teleport(gentity_t* self)
{
	char* temp = NULL;

	G_LogFuncBegin();

	self->type = EntityType::ENT_TRIGGER_TELEPORT;

	G_Trigger_Init(self);

	/*
	 *  unlike other triggers, we need to send this one to the client
	 *  unless is a spectator trigger
	 */
	if ((self->spawnflags & 1) != 0)
	{
		self->r.svFlags |= SVF_NOCLIENT;
	}
	else
	{
		self->r.svFlags &= ~SVF_NOCLIENT;
	}

	self->s.eType = ET_TELEPORT_TRIGGER;
	self->touch = trigger_teleporter_touch;

	if ((self->spawnflags & 16) != 0)
		self->flags ^= FL_LOCKED;

	self->use = trigger_teleport_use;

	if (self->wait > 0) {
		self->nextthink = -1;
		self->think = trigger_teleport_think;
	}

	if (G_SpawnString("soundstart", "", &temp)) {
		self->sound1to2 = G_SoundIndex(temp);
	}

	VectorCopy(self->r.maxs, self->s.origin2);
	VectorCopy(self->r.mins, self->s.angles2);

	trap_LinkEntity(self);

	level.numBrushEnts++;

	G_LogFuncEnd();
}


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

trigger_hurt

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

/*QUAKED trigger_hurt (.5 .5 .5) ? START_OFF TOGGLE SILENT NO_PROTECTION SLOW EVO_PROTECT NO_ADMIN
-----DESCRIPTION-----
Any entity that touches this will be hurt.
It does dmg points of damage each server frame
Targeting the trigger will toggle its on / off state.

-----SPAWNFLAGS-----
1: START_OFF - trigger will not be doing damage until toggled on
2: TOGGLE - can be toggled
4: SILENT - supresses playing the sound
8: NO_PROTECTION - *nothing* stops the damage
16: SLOW - changes the damage rate to once per second
32: EVO_PROTECT - Evosuit protects the client, even if NO_PROTECTION is set
64: NO_ADMIN - admins don't get hurt, even if NO_PROTECTION is set

-----KEYS-----
"dmg" - default 5 (whole numbers only)
*/
/**
 * @brief Use function of trigger_hurt.
 * @param self the trigger
 * @param other another entity
 * @param activator the activator
 */
static void hurt_use(gentity_t* self, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	if (self->count != 0) {
		self->count = 0;
	}
	else {
		self->count = 1;
	}

	G_LogFuncEnd();
}

/**
 * @brief Touch function of trigger_hurt.
 * @param self the trigger
 * @param other the touching entity
 * @param trace a trace
 */
static void hurt_touch(gentity_t* self, gentity_t* other, trace_t* trace) {
	int	dflags;

	G_LogFuncBegin();

	if (self->count == 0) {
		G_LocLogger(LL_DEBUG, "self->count == 0\n");
		G_LogFuncEnd();
		return;
	}

	/*
	 * RPG-X | Phenix | 8/8/204
	 * (If the guy is wearning an evosuit)
	 */
	if (((self->spawnflags & 32) != 0) && ((other->flags & FL_EVOSUIT) != 0)) {
		G_LocLogger(LL_DEBUG, "evosuit protection\n");
		G_LogFuncEnd();
		return;
	}

	if ((self->spawnflags & 64) != 0) {
		if (G_Client_IsAdmin(other)) {
			G_LocLogger(LL_DEBUG, "admins are protected\n");
			G_LogFuncEnd();
			return;
		}
	}

	if (!other->takedamage) {
		G_LocLogger(LL_DEBUG, "other->takedamage is false\n");
		G_LogFuncEnd();
		return;
	}

	if (self->timestamp > level.time) {
		G_LocLogger(LL_DEBUG, "self->timestamp > level.time\n");
		G_LogFuncEnd();
		return;
	}

	/* RPG-X | Phenix | 9/8/2004 */
	if (other->health <= 1) {
		G_LocLogger(LL_DEBUG, "other->health <= 1\n");
		G_LogFuncEnd();
		return;
	}

	if ((self->spawnflags & 16) != 0) {
		self->timestamp = level.time + 1000;
	}
	else {
		self->timestamp = level.time + FRAMETIME;
	}

	/* play sound */
	if ((self->spawnflags & 4) == 0) {
		G_Sound(other, self->noise_index);
	}

	if ((self->spawnflags & 8) != 0) {
		dflags = DAMAGE_NO_PROTECTION;
	}
	else {
		dflags = 0;
	}

	G_Combat_Damage(other, self, self, NULL, NULL, self->damage, dflags, MOD_TRIGGER_HURT);

	G_LogFuncEnd();
}

void SP_trigger_hurt(gentity_t* self) {
	G_LogFuncBegin();

	self->type = EntityType::ENT_TRIGGER_HURT;

	G_Trigger_Init(self);

	/* TiM - gets very annoying after a while */
	self->noise_index = G_SoundIndex("sound/world/electro.wav");
	self->touch = hurt_touch;

	if (self->damage == 0) {
		self->damage = 5;
	}

	self->r.contents = CONTENTS_TRIGGER;

	if ((self->spawnflags & 2) != 0) {
		self->use = hurt_use;
	}

	if ((self->spawnflags & 1) == 0) {
		self->count = 1;
	}
	else {
		self->count = 0;
	}

	VectorCopy(self->r.maxs, self->s.origin2);
	VectorCopy(self->r.mins, self->s.angles2);

	trap_LinkEntity(self);

	level.numBrushEnts++;

	G_LogFuncEnd();
}


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

timer
This should be renamed trigger_timer...

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


/*QUAKED func_timer (0.3 0.1 0.6) (-8 -8 -8) (8 8 8) START_ON
-----DESCRIPTION-----
Fires its targets every "wait" seconds.
Can be turned on or off by using.

-----SPAWNFLAGS-----
1: START_ON - will be on at spawn and setting up for it's first intervall

-----KEYS-----
"wait" - base time between triggering all targets, default is 1
"random" - wait variance, default is 0
so, the basic time between firing is a random time between
(wait - random) and (wait + random)
*/
/**
 * @brief Think function of func_timer.
 * @param self the entity
 */
static void func_timer_think(gentity_t* self) {
	G_LogFuncBegin();

	G_UseTargets(self, self->activator);
	/* set time before next firing */
	self->nextthink = level.time + 1000 * (self->wait + crandom() * self->random);

	G_LogFuncEnd();
}

/**
 * @brief Use function of func_timer.
 * @param self the entity
 * @param other another entity
 * @param activator the activator
 */
static void func_timer_use(gentity_t* self, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	self->activator = activator;

	/* if on, turn it off */
	if (self->nextthink != 0) {
		self->nextthink = 0;
		G_LogFuncEnd();
		return;
	}

	/* turn it on */
	func_timer_think(self);

	G_LogFuncEnd();
}

void SP_func_timer(gentity_t* self) {
	G_LogFuncBegin();

	self->type = EntityType::ENT_FUNC_TIMER;

	G_SpawnFloat("random", "1", &self->random);
	G_SpawnFloat("wait", "1", &self->wait);

	self->use = func_timer_use;
	self->think = func_timer_think;

	if (self->random >= self->wait) {
		self->random = self->wait - FRAMETIME;
		DEVELOPER(G_Printf(S_COLOR_YELLOW "[Entity-Warning] func_timer at %s has random >= wait\n", vtos(self->s.origin)););
	}

	if ((self->spawnflags & 1) != 0) {
		self->nextthink = level.time + FRAMETIME;
		self->activator = self;
	}

	self->r.svFlags = SVF_NOCLIENT;

	G_LogFuncEnd();
}

/*QUAKED trigger_transporter (0.5 0.5 0.5) ?
-----DESCRIPTION-----
This is used in combination with ui_transporter.
Have this be targeted by ui_transporter.

-----SPAWNFLAGS-----
none

-----KEYS-----
"wait"			time to wait before trigger gets deactivated again(in seconds, default 5)
"soundstart"	transport sound;
*/
/**
 * @brief Think function of trigger_transporter.
 * @param ent the trigger
 */
void trigger_transporter_think(gentity_t *ent) {
	G_LogFuncBegin();

	if (Q_stricmp(ent->classname, "tent") != 0) {
		ent->nextthink = -1;
		ent->flags ^= FL_LOCKED;
		ent->flags ^= FL_CLAMPED;
	}
	else {
		ent->target_ent->flags ^= FL_LOCKED;
		ent->target_ent->flags ^= FL_CLAMPED;
		G_FreeEntity(ent);
	}

	G_LogFuncEnd();
}

/**
 * @brief Think function of trigger_transporter for server change.
 * @param ent the trigger
 */
static void trigger_transporter_serverchange(gentity_t* ent) {
	G_LogFuncBegin();

	trap_SendServerCommand(ent->touched - g_entities, va("cg_connect \"%s\"\n", ent->targetname2));
	G_FreeEntity(ent);

	G_LogFuncEnd();
}

/**
 * @brief Touch function of trigger_transporter.
 * @param ent the trigger
 * @param other the touching entity
 * @param trace a trace
 */
static void trigger_transporter_touch(gentity_t* ent, gentity_t* other, trace_t* trace) {
	char*		srv = NULL;
	vec3_t 		offset = { 0, 0, 12 };
	vec3_t 		target = { 0, 0, 0 };
	gentity_t*	targetEnt = NULL;
	gentity_t*	tent = NULL;
	gentity_t*  tent2 = NULL;
	int			clientNum = 0;

	G_LogFuncBegin();

	if ((ent->flags & FL_LOCKED) != 0) {
		G_LocLogger(LL_DEBUG, "locked\n");
		G_LogFuncEnd();
		return;
	}

	if (other == NULL) {
		G_LocLogger(LL_DEBUG, "other entity is NULL\n");
		G_LogFuncEnd();
		return;
	}

	if ((other->flags & FL_CLAMPED) != 0) {
		G_LocLogger(LL_DEBUG, "other entity is clamped\n");
		G_LogFuncEnd();
		return;
	}

	if (other->client == NULL) {
		G_LocLogger(LL_DEBUG, "other entity is not a client\n");
		G_LogFuncEnd();
		return;
	}

	clientNum = other->client->ps.clientNum;

	if ((ent->sound1to2 != 0) && ((ent->flags & FL_CLAMPED) == 0)) {
		G_AddEvent(other, EV_GENERAL_SOUND, ent->sound1to2);
		ent->flags ^= FL_CLAMPED;
	}

	other->flags ^= FL_CLAMPED;

	if (ent->count == 0)
	if (ent->target != NULL && ent->target_ent->target != NULL) {
		targetEnt = G_PickTarget(ent->target_ent->target);
		VectorAdd(targetEnt->s.origin, offset, target);
		G_InitTransport(clientNum, target, targetEnt->s.angles);
	}
	else {
		G_InitTransport(clientNum, ent->target_ent->s.origin, ent->target_ent->s.angles);
	}
	else {
		srv = level.srvChangeData[ent->health].m_ip.data();

		tent = G_Spawn();

		if (tent == NULL) {
			G_LocLogger(LL_ERROR, "Could not spawn new entity!\n");
			G_LogFuncEnd();
			return;
		}

		tent->think = trigger_transporter_serverchange;
		tent->nextthink = level.time + 3000;
		TransDat[clientNum].beamTime = level.time + 8000;
		other->client->ps.powerups[PW_BEAM_OUT] = level.time + 8000;
		tent->touched = other;
		tent->targetname2 = G_NewString(srv);

		tent2 = G_Spawn();

		if (tent2 == NULL) {
			G_FreeEntity(tent);
			G_LocLogger(LL_ERROR, "Could not spawn new entity!\n");
			G_LogFuncEnd();
			return;
		}

		tent2->classname = G_NewString("tent");
		tent2->target_ent = ent;
		tent2->think = trigger_transporter_think;
		tent2->nextthink = level.time + ent->wait;
	}

	G_LogFuncEnd();
}

/**
 * @brief Delay think function of trigger_transporter.
 * @param ent the trigger
 */
void trigger_transporter_delay(gentity_t* ent) {
	G_LogFuncBegin();

	ent->think = trigger_teleport_think;
	ent->nextthink = level.time + ent->wait;
	ent->flags ^= FL_LOCKED;

	G_LogFuncEnd();
}

void SP_trigger_transporter(gentity_t* ent) {
	char* temp = NULL;

	G_LogFuncBegin();

	ent->type = EntityType::ENT_TRIGGER_TRANSPORTER;

	G_Trigger_Init(ent);

	if (G_SpawnString("soundstart", "", &temp))
		ent->sound1to2 = G_SoundIndex(temp);

	if (ent->wait <= 0) {
		ent->wait = 5;
	}
	ent->wait *= 1000;

	ent->touch = trigger_transporter_touch;

	ent->flags ^= FL_LOCKED;

	VectorCopy(ent->r.maxs, ent->s.apos.trBase);
	VectorCopy(ent->r.mins, ent->s.pos.trBase);

	trap_LinkEntity(ent);

	level.numBrushEnts++;

	G_LogFuncEnd();
}

/*QUAKED trigger_radiation (0.5 0.5 0.5) ? START_OFF MAP_WIDE
-----DESCRIPTION-----
This can be used in three ways:
- as radiation volume trigger
- as mapwide radiation

-----SPAWNFLAGS-----
1: START_OFF - ent is off at spawn
2: MAP_WIDE - mapwide radiation

-----KEYS-----
The damage the radiation does is calculated from these two values:
"damage"			damage(default 1)
"wait"			wait(seconds, default 10)

Forumla is: dps = dmg / wait
*/
/**
 * @brief Touch function of trigger_radiation.
 * @param ent the trigger
 * @param other the touching entity
 * @param trace a trace
 */
static void trigger_radiation_touch(gentity_t* ent, gentity_t* other, trace_t* trace) {
	G_LogFuncBegin();

	if (other == NULL) {
		G_LocLogger(LL_DEBUG, "other entity is NULL\n");
		G_LogFuncEnd();
		return;
	}

	if (other->client == NULL) {
		G_LocLogger(LL_DEBUG, "other entity is not a client\n");
		G_LogFuncEnd();
		return;
	}

	if (ent->count == 0) {
		G_LocLogger(LL_DEBUG, "ent->count is 0\n");
		G_LogFuncEnd();
		return;
	}

	if ((ent->flags & FL_LOCKED) == 0) {
		if (other->health - ent->damage < 0) {
			other->health = 0;
		}
		else {
			other->health -= ent->damage;
		}
		other->client->ps.stats[STAT_HEALTH] = other->health;

		ent->flags ^= FL_LOCKED;
	}

	/* TODO: display radiation symbol? */

	G_LogFuncEnd();
}

/**
 * @brief Think function of trigger_radiation.
 * @param ent the trigger
 */
static void trigger_radiation_think(gentity_t* ent) {
	G_LogFuncBegin();

	if ((ent->flags & FL_LOCKED) != 0) {
		ent->flags ^= FL_LOCKED;
	}

	G_LogFuncEnd();
}

/**
 * @brief Use function of trigger_radiation.
 * @param ent the trigger
 * @param other another entity
 * @param activator the activator
 */
static void trigger_radiation_use(gentity_t* ent, gentity_t* other, gentity_t* activator) {
	G_LogFuncBegin();

	if (ent->count == 0) {
		ent->count = 1;
	}
	else {
		ent->count = 0;
	}

	G_LogFuncEnd();
}

void SP_trigger_radiation(gentity_t* ent) {
	G_LogFuncBegin();

	ent->type = EntityType::ENT_TRIGGGER_RADIATION;

	if (ent->damage == 0) {
		ent->damage = 1;
	}

	if (ent->wait <= 0) {
		ent->wait = 10000;
	}
	else {
		ent->wait *= 1000;
	}

	G_Trigger_Init(ent);

	if ((ent->spawnflags & 1) == 0) {
		ent->count = 1;
	}
	else {
		ent->count = 0;
	}

	if ((ent->spawnflags & 2) == 0) {
		ent->touch = trigger_radiation_touch;
	}

	ent->think = trigger_radiation_think;
	ent->nextthink = level.time + ent->wait;
	ent->flags ^= FL_LOCKED;
	ent->use = trigger_radiation_use;

	VectorCopy(ent->r.maxs, ent->s.apos.trBase);
	VectorCopy(ent->r.mins, ent->s.pos.trBase);

	trap_LinkEntity(ent);

	if (!ent->tmpEntity) {
		level.numBrushEnts++;
	}

	G_LogFuncEnd();
}

/*QUAKED trigger_airlock (0.5 0.5 0.5) ?
-----DESCRIPTION-----
This is an entity that manages airlocks.
It can be used for Maintenance-Locks (Space Walks) internal Airlocks (for example to a quarantene zone)
or... as a way to abandon ship the hard way ^^ In that last case even an EVA-Suit won't protect you.

It is controlled by User Interface.

The Entity automatically features door management in a cycle, a check for an EVA-Suit (trigger_hurt)
and a push to get overboard (trigger_push).

It is hardcoded to expect func_doors for entrance on either side and a func_forcefiled for ejecting
(the forcefield is best placed within the outer door).

For Setup please set both sets of doors to wait = -1 and have the inner (if you select spawnflag no. 1
the outer) door spawn in it's open state.

-----SPAWNFLAGS-----
1: START_OUTSIDE - assumes that the outside door is open and set's itself up approopriately to cycle in at first use
2: NO_VENT - Will not check for push-target and forcefield that are required to vent the airlock.
4: QUARTANTENE_LOCK - airlock will be considered as an internal airlock to a quarantene zone or similar.
this will not kill and will not check for ejection-stuff, so NO_VENT is included in this spawnflag.

-----KEYS-----
"wait"			time to wait before trigger gets deactivated again(in seconds, default 5)
"soundstart"	transport sound;
*/