#ifndef TURRET_H
#define TURRET_H

// functions:
entity get_turretinfo(int id);

// fields:
.entity tur_head;

// target selection flags
.int target_select_flags;
.int target_validate_flags;
const int TFL_TARGETSELECT_NO = 2; // don't automatically find targets
const int TFL_TARGETSELECT_LOS = 4; // require line of sight to find targets
const int TFL_TARGETSELECT_PLAYERS = 8; // target players
const int TFL_TARGETSELECT_MISSILES = 16; // target projectiles
const int TFL_TARGETSELECT_TRIGGERTARGET = 32; // respond to turret_trigger_target events
const int TFL_TARGETSELECT_ANGLELIMITS = 64; // apply extra angular limits to target selection
const int TFL_TARGETSELECT_RANGELIMITS = 128; // limit target selection range
const int TFL_TARGETSELECT_TEAMCHECK = 256; // don't attack teammates
const int TFL_TARGETSELECT_NOBUILTIN = 512; // only attack targets when triggered
const int TFL_TARGETSELECT_OWNTEAM = 1024; // only attack teammates
const int TFL_TARGETSELECT_NOTURRETS = 2048; // don't attack other turrets
const int TFL_TARGETSELECT_FOV = 4096; // extra limits to attack range
const int TFL_TARGETSELECT_MISSILESONLY = 8192; // only attack missiles

// aim flags
.int aim_flags;
const int TFL_AIM_NO = 1; // no aiming
const int TFL_AIM_SPLASH = 2; // aim for ground around the target's feet
const int TFL_AIM_LEAD = 4; // try to predict target movement
const int TFL_AIM_SHOTTIMECOMPENSATE = 8; // compensate for shot traveltime when leading
const int TFL_AIM_ZPREDICT = 16; // predict target's z position at impact
const int TFL_AIM_SIMPLE = 32; // aim at player's current location

// tracking flags
.int track_flags;
const int TFL_TRACK_NO = 2; // don't move head
const int TFL_TRACK_PITCH = 4; // pitch head
const int TFL_TRACK_ROTATE = 8; // rotate head

// prefire checks
.int firecheck_flags;
const int TFL_FIRECHECK_DEAD = 4; // don't attack dead targets (zombies?)
const int TFL_FIRECHECK_DISTANCES = 8; // another range check
const int TFL_FIRECHECK_LOS = 16; // line of sight
const int TFL_FIRECHECK_AIMDIST = 32; // consider distance impactpoint<->aimspot
const int TFL_FIRECHECK_REALDIST = 64; // consider enemy origin<->impactpoint
const int TFL_FIRECHECK_ANGLEDIST = 128; // consider angular diff head<->aimspot
const int TFL_FIRECHECK_TEAMCHECK = 256; // don't attack teammates
const int TFL_FIRECHECK_AFF = 512; // try to avoid any friendly fire
const int TFL_FIRECHECK_AMMO_OWN = 1024; // own ammo needs to be larger than damage dealt
const int TFL_FIRECHECK_AMMO_OTHER = 2048; // target's ammo needs to be less than max
const int TFL_FIRECHECK_REFIRE = 4096; // check single attack finished delays
const int TFL_FIRECHECK_NO = 16384; // no prefire checks

// attack flags
.int shoot_flags;
const int TFL_SHOOT_NO = 64; // no attacking
const int TFL_SHOOT_VOLLY = 2; // fire in vollies
const int TFL_SHOOT_VOLLYALWAYS = 4; // always do a full volly, even if target is lost
const int TFL_SHOOT_HITALLVALID = 8; // loop through all valid targets
const int TFL_SHOOT_CLEARTARGET = 16; // lose target after attack (after volly is done if in volly mode)
const int TFL_SHOOT_CUSTOM = 32; // custom attacking

// turret capabilities
.int turret_flags;
const int TUR_FLAG_NONE = 0; // no abilities
const int TUR_FLAG_SNIPER = 2; // sniping turret
const int TUR_FLAG_SPLASH = 4; // can deal splash damage
const int TUR_FLAG_HITSCAN = 8; // hit scan
const int TUR_FLAG_MULTIGUN = 16; // multiple guns
const int TUR_FLAG_GUIDED = 32; // laser guided projectiles
const int TUR_FLAG_SLOWPROJ = 64; // turret fires slow projectiles
const int TUR_FLAG_MEDPROJ = 128; // turret fires medium projectiles
const int TUR_FLAG_FASTPROJ = 256; // turret fires fast projectiles
const int TUR_FLAG_PLAYER = 512; // can damage players
const int TUR_FLAG_MISSILE = 1024; // can damage missiles
const int TUR_FLAG_SUPPORT = 2048; // supports other units
const int TUR_FLAG_AMMOSOURCE = 4096; // can provide ammunition
const int TUR_FLAG_RECIEVETARGETS = 8192; // can recieve targets from external sources
const int TUR_FLAG_MOVE = 16384; // can move
const int TUR_FLAG_ROAM = 32768; // roams around if not attacking
const int TUR_FLAG_ISTURRET = 65536; // identifies this unit as a turret

// ammo types
#define ammo_flags currentammo
const int TFL_AMMO_NONE = 64; // doesn't use ammo
const int TFL_AMMO_ENERGY = 2; // uses power
const int TFL_AMMO_BULLETS = 4; // uses bullets
const int TFL_AMMO_ROCKETS = 8; // uses explosives
const int TFL_AMMO_RECHARGE = 16; // regenerates ammo
const int TFL_AMMO_RECIEVE = 32; // can recieve ammo from support units

// damage flags
.int damage_flags;
const int TFL_DMG_NO = 256; // doesn't take damage
const int TFL_DMG_YES = 2; // can be damaged
const int TFL_DMG_TEAM = 4; // can be damaged by teammates
const int TFL_DMG_RETALIATE = 8; // target attackers
const int TFL_DMG_RETALIATE_TEAM = 16; // target attackers, even if on same team
const int TFL_DMG_TARGETLOSS = 32; // loses target when damaged
const int TFL_DMG_AIMSHAKE = 64; // damage throws off aim
const int TFL_DMG_HEADSHAKE = 128; // damage shakes head
const int TFL_DMG_DEATH_NORESPAWN = 256; // no re-spawning

// spawn flags
const int TSF_SUSPENDED = 1;
const int TSF_TERRAINBASE = 2; // currently unused
const int TSF_NO_AMMO_REGEN = 4; // disable builtin ammo regeneration
const int TSF_NO_PATHBREAK = 8; // don't break path to chase enemies, will still fire at them if possible
const int TSL_NO_RESPAWN = 16; // don't re-spawn
const int TSL_ROAM = 32; // roam while idle

// send flags
const int TNSF_UPDATE       = 2;
const int TNSF_STATUS       = 4;
const int TNSF_SETUP        = 8;
const int TNSF_ANG          = 16;
const int TNSF_AVEL         = 32;
const int TNSF_MOVE         = 64;
.float anim_start_time;
const int TNSF_ANIM         = 128;

const int TNSF_FULL_UPDATE  = 16777215;


// other useful macros
#define _TUR_ACTION(tur, mrequest) tur.turret_func(tur, mrequest)
#define TUR_ACTION(tur, mrequest) _TUR_ACTION(get_turretinfo(tur), mrequest)
#define TUR_NAME(turrettype) (get_turretinfo(turrettype)).turret_name

bool t_new(entity this, int req);

CLASS(Turret, Object)
    ATTRIB(Turret, m_id, int, 0)

    /** short name */
    ATTRIB(Turret, netname, string, string_null)
    /** human readable name */
    ATTRIB(Turret, turret_name, string, string_null)
    /** t_... */
    ATTRIB(Turret, turret_func, float(Turret, int), t_new)
    /** currently a copy of the model */
    ATTRIB(Turret, mdl, string, string_null)
    /** full name of model */
    ATTRIB(Turret, model, string, string_null)
    /** full name of tur_head model */
    ATTRIB(Turret, head_model, string, string_null)

    ATTRIB(Turret, spawnflags, int, 0)
    /** turret hitbox size */
    ATTRIB(Turret, mins, vector, '-0 -0 -0')
    /** turret hitbox size */
    ATTRIB(Turret, maxs, vector, '0 0 0')

    METHOD(Turret, display, void(entity this, void(string name, string icon) returns)) {
        returns(this.turret_name, string_null);
    }

ENDCLASS(Turret)

// turret requests
const int TR_SETUP = 1; // (BOTH) setup turret data
.bool(Turret) tr_setup;
const int TR_THINK = 2; // (SERVER) logic to run every frame
.bool(Turret) tr_think;
const int TR_DEATH = 3; // (SERVER) called when turret dies
.bool(Turret) tr_death;
const int TR_PRECACHE = 4; // (BOTH) precaches models/sounds used by this turret
.bool(Turret) tr_precache;
/** (SERVER) called when turret attacks */
.void(Turret) tr_attack;
const int TR_CONFIG = 6; // (ALL)
.bool(Turret) tr_config;

bool t_new(Turret this, int req)
{
    if (req == TR_SETUP) return this.tr_setup ? this.tr_setup(this) : false;
    if (req == TR_THINK) return this.tr_think ? this.tr_think(this) : false;
    if (req == TR_DEATH) return this.tr_death ? this.tr_death(this) : false;
    if (req == TR_PRECACHE) return this.tr_precache ? this.tr_precache(this) : false;
    if (req == TR_CONFIG) return this.tr_config ? this.tr_config(this) : false;
    return false;
}

#endif