g_ai.cpp

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/*
Copyright (C) 2002-2022 UFO: Alien Invasion.

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.

*/

#include "g_ai.h"
#include "g_actor.h"
#include "g_client.h"
#include "g_combat.h"
#include "g_edicts.h"
#include "g_health.h"
#include "g_inventory.h"
#include "g_move.h"
#include "g_utils.h"
#include "g_vis.h"
#include "g_reaction.h"

class AiAction {
public:
    pos3_t to;          
    pos3_t stop;        
    shoot_types_t shootType;    
    byte shots;         
    Edict* target;      
    const fireDef_t* fd;
    int z_align;        
    inline void reset() {
        OBJZERO(*this);
    }
};

AiAreaSearch::AiAreaSearch(void) {
    plotArea(pos3_origin, 0);
}

AiAreaSearch::AiAreaSearch(const pos3_t origin, int radius, bool flat) {
    plotArea(origin, radius, flat);
}

AiAreaSearch::~AiAreaSearch(void) {
    _area.clear();
}

bool AiAreaSearch::getNext(pos3_t pos) {
    return _area.dequeue(pos);
}

AiAreaSearch::LQueue::~LQueue(void) {
    clear();
}

void AiAreaSearch::LQueue::enqueue(const pos3_t data) {
    qnode_s* node = static_cast<qnode_s*>(G_TagMalloc(sizeof(qnode_s), TAG_LEVEL));
    VectorCopy(data, node->data);
    node->next = nullptr;

    if (isEmpty())
        _head = _tail = node;
    else {
        _tail->next = node;
        _tail = node;
    }
    _count++;
}

bool AiAreaSearch::LQueue::dequeue(pos3_t data) {
    if (isEmpty())
        return false;

    VectorCopy(_head->data, data);
    qnode_s* node = _head;
    _head = _head->next;
    _count--;
    G_MemFree(node);

    return true;
}

void AiAreaSearch::LQueue::clear(void) {
    qnode_s* next = nullptr;
    for (qnode_s* node = _head; node; node = next) {
        next = node->next;
        G_MemFree(node);
    }
    _head = _tail = nullptr;
    _count = 0;
}

void AiAreaSearch::plotArea(const pos3_t origin, int radius, bool flat) {
        /* Starting with a sphere with radius 0 (just the center pos) out to the given radius */
        for (int i = 0; i <= radius; ++i) {
            /* Battlescape has max PATHFINDING_HEIGHT levels, so cap the z offset to the max levels
             * the unit can currently go up or down */
            const int zOfsMax = std::min(std::max(static_cast<int>(origin[2]), PATHFINDING_HEIGHT - origin[2] - 1), i);
            /* Starting a the center z level up to zOfsMax levels */
            if (flat)
                plotCircle(origin, i);
            else
                for (int zOfs = 0; zOfs <= zOfsMax; ++zOfs) {
                    pos3_t center = {origin[0], origin[1], static_cast<pos_t>(origin[2] + zOfs)};
                    plotCircle(center, i - zOfs);
                    /* We need to cover both up and down directions, so we Flip the sign (if there's actually a z offset) */
                    if (zOfs != 0) {
                        center[2] = origin[2] - zOfs;
                        plotCircle(center, i - zOfs);
                    }
                }
        }
}

void AiAreaSearch::plotCircle(const pos3_t origin, int radius) {
    /* There are always more levels in one direction than the other (since the number is even)
     * so check if out of bounds */
    if (origin[2] >= PATHFINDING_HEIGHT)
        return;
    /* This is the main loop of the midpoint circle algorithm this specific variation
     * circles of consecutive integer radius won't overlap in any point or leave gaps in between,
     * Coincidentally (at time of writing) a circle of radius n will be exactly the farthest a normal actor can walk
     * with n * 2 TU, in ideal conditions (standing, no obstacles, no penalties) */
    for (int dy = 1, xOfs = 0, yOfs = radius; xOfs <= yOfs; ++xOfs, dy += 1, yOfs = radius - (dy >> 1)) {
        /* Have the offsets, now to fill the octants */
        plotPos(origin, xOfs, yOfs);
        /* Need to Flip the signs, for each one */
        if (xOfs != 0) {
            plotPos(origin, -xOfs, yOfs);
        }
        if (yOfs != 0) {
            plotPos(origin, xOfs, -yOfs);
        }
        if (xOfs != 0 && yOfs != 0) {
            plotPos(origin, -xOfs, -yOfs);
        }
        /* And need to Flip the x and y offsets too */
        if (xOfs != yOfs) {
            plotPos(origin, yOfs, xOfs);
            if (yOfs != 0) {
                plotPos(origin, -yOfs, xOfs);
            }
            if (xOfs != 0) {
                plotPos(origin, yOfs, -xOfs);
            }
            if (yOfs != 0 && xOfs != 0) {
                plotPos(origin, -yOfs, -xOfs);
            }
        }
    }
}

void AiAreaSearch::plotPos(const pos3_t origin, int xOfs, int dy) {
    /* There's more distance to one (possible) edge of the map than the other
     *  check if out of bounds to be safe */
    if (origin[0] + xOfs < 0 || origin[0] + xOfs >= PATHFINDING_WIDTH || origin[1] + dy < 0
            || origin[1] + dy >= PATHFINDING_WIDTH)
        return;
    const pos3_t pos = {static_cast<pos_t>(origin[0] + xOfs), static_cast<pos_t>(origin[1] + dy), origin[2]};
    /* Most maps won't use the full space available so check against the actual map area */
    vec3_t vec;
    PosToVec(pos, vec);
    if (!gi.isOnMap(vec))
        return;
    _area.enqueue(pos);
}

#define SCORE_HIDE          60
#define SCORE_CLOSE_IN      20
#define SCORE_KILL          30
#define SCORE_RANDOM        10
#define SCORE_REACTION_ERADICATION 30
#define SCORE_REACTION_FEAR_FACTOR 20
#define SCORE_NONHIDING_PLACE_PENALTY 25
#define SCORE_RAGE          40
#define SCORE_DAMAGE        100.0f
#define SCORE_DAMAGE_FACTOR 1.25f
#define SCORE_CIV_FACTOR    0.25f
#define SCORE_DISABLED_FACTOR 0.25f
#define SCORE_DAMAGE_WORTH_FACTOR   0.1f

#define SCORE_CIV_RANDOM    10
#define SCORE_RUN_AWAY      50
#define SCORE_CIV_LAZINESS  5
#define RUN_AWAY_DIST       160
#define WAYPOINT_CIV_DIST   768
#define HERD_THRESHOLD      128.0f
#define SCORE_HERDING_PENALTY 100
#define SCORE_NOSAFE_POSITION_PENALTY 500

#define SCORE_MISSION_OPPONENT_TARGET   50
#define SCORE_MISSION_TARGET    60
#define SCORE_MISSION_HOLD      25
#define MISSION_HOLD_DIST       96

#define SCORE_PANIC_RUN_TO_FRIENDS 300.0f
#define SCORE_PANIC_FLEE_FROM_STRANGERS 500.0f
#define SCORE_PANIC_RANDOM 25.0f

#define AI_ACTION_NOTHING_FOUND -10000.0f

#define CLOSE_IN_DIST       1200.0f
#define SPREAD_FACTOR       8.0f
#define SPREAD_NORM(x)      ((x) > 0 ? SPREAD_FACTOR/((x)*torad) : 0)

#define HIDE_DIST           25
#define HERD_DIST           25
#define HOLD_DIST           3

#define CALC_DAMAGE_SAMPLES 10.0f
#define INVDEF_FOR_SHOOTTYPE(st) (IS_SHOT_RIGHT(st)?INVDEF(CID_RIGHT):IS_SHOT_LEFT(st)?INVDEF(CID_LEFT):IS_SHOT_HEADGEAR(st)?INVDEF(CID_HEADGEAR):nullptr)

static pathing_t* hidePathingTable;
static pathing_t* herdPathingTable;

void AI_Init (void)
{
    hidePathingTable = nullptr;
    herdPathingTable = nullptr;
}

bool AI_HasLineOfFire (const Actor* actor, const Edict* target)
{
    for (shoot_types_t shootType = ST_RIGHT; shootType < ST_NUM_SHOOT_TYPES; shootType++) {
        const Item* item = AI_GetItemForShootType(shootType, actor);
        if (item == nullptr)
            continue;

        const fireDef_t* fdArray = item->getFiredefs();
        if (fdArray == nullptr)
            continue;

        for (fireDefIndex_t fdIdx = 0; fdIdx < item->ammoDef()->numFiredefs[fdArray->weapFdsIdx]; fdIdx++) {
            const fireDef_t* fd = &fdArray[fdIdx];
            if (AI_CheckLineOfFire(actor, target, fd, 1))
                return true;
        }
    }
    return false;
}

static bool AI_IsExposed (int team, Actor* check)
{
    if (G_TestVis(team, check, VT_PERISHCHK | VT_NOFRUSTUM) & VS_YES)
        return true;

    Actor* from = nullptr;
    while ((from = G_EdictsGetNextLivingActor(from))) {
        const int fromTeam = from->getTeam();
        if ((team >= 0 && fromTeam != team) || (team < 0 && fromTeam == -team))
            continue;

        if (AI_HasLineOfFire(from, check))
            return true;
    }

    return false;
}
static bool AI_CheckFF (const Edict* ent, const vec3_t target, float spread, float radius)
{
    /* spread data */
    spread *= 2;
    if (spread < 1.0)
        spread = 1.0;
    spread *= torad;

    const float cosSpread = cos(spread);
    vec3_t dtarget;
    VectorSubtract(target, ent->origin, dtarget);
    VectorNormalizeFast(dtarget);
    vec3_t back;
    VectorScale(dtarget, PLAYER_WIDTH / spread, back);

    Actor* check = nullptr;
    while ((check = G_EdictsGetNextLivingActorOfTeam(check, ent->getTeam()))) {
        if (!ent->isSameAs(check)) {
            vec3_t dcheck;
            /* found ally */
            VectorSubtract(check->origin, ent->origin, dcheck);
            if (DotProduct(dtarget, dcheck) > 0.0) {
                /* ally in front of player */
                VectorAdd(dcheck, back, dcheck);
                VectorNormalizeFast(dcheck);
                if (DotProduct(dtarget, dcheck) > cosSpread)
                    return true;
            }
        }
        if (VectorDist(target, check->origin) < radius + UNIT_SIZE)
            return true;
    }

    /* no ally in danger */
    return false;
}

bool AI_FighterCheckShoot (const Actor* actor, const Edict* check, const fireDef_t* fd, float dist)
{
    /* check range */
    if (dist > fd->range)
        return false;

    /* if insane, we don't check more */
    if (actor->isInsane())
        return true;

    /* don't shoot - we are too close */
    if (dist < fd->splrad)
        return false;

    /* check FF */
    vec2_t effSpread;
    G_CalcEffectiveSpread(actor, fd, effSpread);
    if (AI_CheckFF(actor, check->origin, effSpread[0], fd->splrad))
        return false;

    return true;
}

bool AI_CheckUsingDoor (const Edict* ent, const Edict* door)
{
    /* don't try to use the door in every case */
    if (frand() < 0.3f)
        return false;

    /* not in the view frustum - don't use the door while not seeing it */
    if (!G_FrustumVis(door, ent->origin))
        return false;

    /* if the alien is trying to hide and the door is
    * still opened, close it */
    if (ent->hiding && door->doorState == STATE_OPENED)
        return true;

    /* aliens and civilians need different handling */
    switch (ent->getTeam()) {
    case TEAM_ALIEN: {
        /* only use the door when there is no civilian or phalanx to kill */
        Actor* check = nullptr;

        /* see if there are enemies */
        while ((check = G_EdictsGetNextLivingActor(check))) {
            /* don't check for aliens */
            if (check->isSameTeamAs(ent))
                continue;
            /* check whether the origin of the enemy is inside the
             * AI actors view frustum */
            if (!G_FrustumVis(check, ent->origin))
                continue;
            /* check whether the enemy is close enough to change the state */
            if (VectorDist(check->origin, ent->origin) > G_VisCheckDist(ent))
                continue;
            const float actorVis = G_ActorVis(check, ent, true);
            /* there is a visible enemy, don't use that door */
            if (actorVis > ACTOR_VIS_0)
                return false;
        }
    }
        break;
    case TEAM_CIVILIAN:
        /* don't use any door if no alien is inside the viewing angle  - but
         * try to hide behind the door when there is an alien */
        break;
    default:
        gi.DPrintf("Invalid team in AI_CheckUsingDoor: %i for ent type: %i\n", ent->getTeam(), ent->type);
        break;
    }
    return true;
}

static bool AI_CheckCrouch (const Actor* actor)
{
    if (G_IsCrouched(actor))
        return false;

    Actor* check = nullptr;

    /* see if we are very well visible by an enemy */
    while ((check = G_EdictsGetNextLivingActor(check))) {
        /* don't check for civilians or aliens */
        if (check->isSameTeamAs(actor) || G_IsCivilian(check))
            continue;
        /* check whether the origin of the enemy is inside the
         * AI actors view frustum */
        if (!G_FrustumVis(check, actor->origin))
            continue;
        /* check whether the enemy is close enough to change the state */
        if (VectorDist(check->origin, actor->origin) > G_VisCheckDist(actor))
            continue;
        const float actorVis = G_ActorVis(check, actor, true);
        if (actorVis >= ACTOR_VIS_50)
            return true;
    }
    return false;
}

bool AI_HideNeeded (const Actor* actor)
{
    /* aliens will consider hiding if they are not brave, or there is a dangerous enemy in sight */
    const bool brave = actor->morale > mor_brave->integer;

    Actor* from = nullptr;
    /* test if actor is visible */
    while ((from = G_EdictsGetNextLivingActor(from))) {
        if (!AI_IsHostile(actor, from))
            continue;

        const Item* item = from->getRightHandItem();
        if (!item)
            item = from->getLeftHandItem();
        if (!item)
            continue;

        const fireDef_t* fd = item->getFiredefs();
        /* search the (visible) inventory (by just checking the weapon in the hands of the enemy) */
        const bool inRange = fd != nullptr && fd->range * fd->range >= VectorDistSqr(actor->origin, from->origin);
        const int damageRand = !inRange ? 0 : fd->damage[0] + fd->spldmg[0] + ((fd->damage[1] + fd->spldmg[1]) * crand());
        const int damage = std::max(0, damageRand);
        if (!brave || damage >= actor->HP / 3) {
            const int hidingTeam = AI_GetHidingTeam(actor);
            /* now check whether this enemy is visible for this alien */
            if (G_Vis(hidingTeam, actor, from, VT_NOFRUSTUM) || AI_HasLineOfFire(from, actor))
                return true;
        }
    }
    return false;
}

static inline const Item* AI_GetItemFromInventory (const Item* ic)
{
    if (ic == nullptr)
        return nullptr;

    const Item* item = ic;
    if (item->ammoDef() && item->isWeapon() && !item->mustReload())
        return item;

    return nullptr;
}

const Item* AI_GetItemForShootType (shoot_types_t shootType, const Edict* ent)
{
    /* optimization: reaction fire is automatic */
    if (IS_SHOT_REACTION(shootType))
        return nullptr;

    /* check that the current selected shoot type also has a valid item in its
     * corresponding hand slot of the inventory. */
    if (IS_SHOT_RIGHT(shootType)) {
        const Item* item = ent->getRightHandItem();
        return AI_GetItemFromInventory(item);
    } else if (IS_SHOT_LEFT(shootType)) {
        const Item* item = ent->getLeftHandItem();
        return AI_GetItemFromInventory(item);
    } else if (IS_SHOT_HEADGEAR(shootType)) {
        return nullptr;
    }

    return nullptr;
}

int AI_GetHidingTeam (const Edict* ent)
{
    if (G_IsCivilian(ent))
        return TEAM_ALIEN;
    return -ent->getTeam();
}

bool AI_CheckPosition (const Actor* const actor, const pos3_t pos)
{
    if (actor->isInsane())
        return true;

    /* Don't stand on hurt triggers or fire/stun gas */
    Edict* check = nullptr;
    while ((check = G_EdictsGetNextInUse(check))) {
        if (!check->isSamePosAs(pos) || check->dmg <= 0)
            continue;
        if (G_ApplyProtection(actor, check->dmgtype, check->dmg) > 0)
            return false;
    }
    return true;
}

bool AI_FindHidingLocation (int team, Actor* actor, const pos3_t from, int tuLeft)
{
    /* We need a local table to calculate the hiding steps */
    if (!hidePathingTable)
        hidePathingTable = (pathing_t*) G_TagMalloc(sizeof(*hidePathingTable), TAG_LEVEL);

    /* search hiding spot */
    const int maxTUs = std::min(tuLeft, HIDE_DIST * 2);
    const int distance = (maxTUs + 1) / TU_MOVE_STRAIGHT;
    G_MoveCalcLocal(hidePathingTable, 0, actor, from, maxTUs);

    int bestScore = AI_ACTION_NOTHING_FOUND;
    pos3_t bestPos = {0, 0, PATHFINDING_HEIGHT};
    AiAreaSearch searchArea(from, distance, true);
    while (searchArea.getNext(actor->pos)) {
        /* Don't have TUs  to walk there */
        const pos_t delta = G_ActorMoveLength(actor, hidePathingTable, actor->pos, false);
        if (delta > tuLeft || delta == ROUTING_NOT_REACHABLE)
            continue;

        /* Don't stand on dangerous terrain! */
        if (!AI_CheckPosition(actor, actor->pos))
            continue;

        /* If enemies see this position, it doesn't qualify as hiding spot */
        actor->calcOrigin();
        if (AI_IsExposed(team, actor))
            continue;

        const int score = tuLeft - delta;
        if (score > bestScore) {
            bestScore = score;
            VectorCopy(actor->pos, bestPos);
        }
    }

    if (bestPos[2] != PATHFINDING_HEIGHT) {
        VectorCopy(bestPos, actor->pos);
        return true;
    }
    return false;
}

bool AI_FindHerdLocation (Actor* actor, const pos3_t from, const vec3_t target, int tu, bool inverse)
{
    if (!herdPathingTable)
        herdPathingTable = (pathing_t*) G_TagMalloc(sizeof(*herdPathingTable), TAG_LEVEL);

    /* find the nearest enemy actor to the target*/
    vec_t bestLength = -1.0f;
    Actor* next = nullptr;
    Actor* enemy = nullptr;
    int team = AI_GetHidingTeam(actor);
    const bool invTeam = team < 0;
    team = std::abs(team);
    while ((next = G_EdictsGetNextLivingActor(next))) {
        if (next->getTeam() == team ? invTeam : !invTeam)
            continue;
        const vec_t length = VectorDistSqr(target, next->origin);
        if (length < bestLength || bestLength < 0.0f) {
            enemy = next;
            bestLength = length;
        }
    }
    if (!enemy)
        return false;

    /* calculate move table */
    const int maxTUs = std::min(tu, HERD_DIST * 2);
    const int distance = (maxTUs + 1) / TU_MOVE_STRAIGHT;
    G_MoveCalcLocal(herdPathingTable, 0, actor, from, maxTUs);

    /* search the location */
    pos3_t bestPos = {0, 0, PATHFINDING_HEIGHT};
    bestLength = VectorDistSqr(target, actor->origin);
    AiAreaSearch searchArea(from, distance, true);
    while (searchArea.getNext(actor->pos)) {
        /* time */
        const pos_t delta = G_ActorMoveLength(actor, herdPathingTable, actor->pos, false);
        if (delta > tu || delta == ROUTING_NOT_REACHABLE)
            continue;

        /* Don't stand on dangerous terrain! */
        if (!AI_CheckPosition(actor, actor->pos))
            continue;

        actor->calcOrigin();
        const vec_t length = VectorDistSqr(actor->origin, target);
        /* Don't pack them too close */
        if (length < HERD_THRESHOLD * HERD_THRESHOLD)
            continue;

        if (length < bestLength || bestPos[2] == PATHFINDING_HEIGHT) {
            vec3_t vfriend, venemy;
            /* check this position to locate behind target from enemy */
            VectorSubtract(target, actor->origin, vfriend);
            VectorNormalizeFast(vfriend);
            VectorSubtract(enemy->origin, actor->origin, venemy);
            VectorNormalizeFast(venemy);
            const float dotProd = DotProduct(vfriend, venemy);
            if ((inverse ? -dotProd : dotProd) > 0.5f) {
                bestLength = length;
                VectorCopy(actor->pos, bestPos);
            }
        }
    }

    if (bestPos[2] != PATHFINDING_HEIGHT) {
        VectorCopy(bestPos, actor->pos);
        return true;
    }

    return false;
}

static Edict* AI_SearchDestroyableObject (const Actor* actor, const fireDef_t* fd)
{
#if 0
    /* search best none human target */
    Edict* check = nullptr;
    float dist;

    while ((check = G_EdictsGetNextInUse(check))) {
        if (G_IsBreakable(check)) {
            if (!AI_FighterCheckShoot(actor, check, fd, &dist))
                continue;

            /* check whether target is visible enough */
            const float vis = G_ActorVis(actor->origin, check, true);
            if (vis < ACTOR_VIS_0)
                continue;

            /* take the first best breakable or door and try to shoot it */
            return check;
        }
    }
#endif
    return nullptr;
}

#define LOF_CHECK_PARTITIONS    4
bool AI_CheckLineOfFire (const Actor* shooter, const Edict* target, const fireDef_t* fd, int shots)
{
    vec3_t dir, origin;
    VectorSubtract(target->origin, shooter->origin, dir);
    fd->getShotOrigin(shooter->origin, dir, shooter->isCrouched(), origin);
    if (!fd->gravity) {
        /* gun-to-target line free? */
        const trace_t trace = G_Trace(Line(origin, target->origin), shooter, MASK_SHOT);
        const Edict* trEnt = G_EdictsGetByNum(trace.entNum);
        const bool hitBreakable = trEnt && G_IsBrushModel(trEnt) && G_IsBreakable(trEnt);
        const bool shotBreakable = hitBreakable && (fd->shots > 1 || shots > 1)
                && trEnt->HP < fd->damage[0] && !(fd->splrad > 0.0f) && !fd->bounce;
        if (trace.fraction < 1.0f && (!trEnt || (!VectorCompare(trEnt->pos, target->pos) && !shotBreakable)))
            return false;
    } else {
        /* gun-to-target *parabola* free? */
        vec3_t at, v;
        VectorCopy(target->origin, at);
        /* Grenades are targeted at the ground in G_ShootGrenade */
        at[2] -= GROUND_DELTA;
        const float dt = gi.GrenadeTarget(origin, at, fd->range, fd->launched, fd->rolled, v) / LOF_CHECK_PARTITIONS;
        if (!dt)
            return false;
        VectorSubtract(at, origin, dir);
        VectorScale(dir, 1.0f / LOF_CHECK_PARTITIONS, dir);
        dir[2] = 0;
        float vz = v[2];
        int i;
        for (i = 0; i < LOF_CHECK_PARTITIONS; i++) {
            VectorAdd(origin, dir, at);
            at[2] += dt * (vz - 0.5f * GRAVITY * dt);
            vz -= GRAVITY * dt;
            const trace_t trace = G_Trace(Line(origin, at), shooter, MASK_SHOT);
            const Edict* trEnt = G_EdictsGetByNum(trace.entNum);
            if (trace.fraction < 1.0f && (!trEnt || !VectorCompare(trEnt->pos, target->pos))) {
                break;
            }
            VectorCopy(at, origin);
        }
        if (i < LOF_CHECK_PARTITIONS)
            return false;
    }
    return true;
}

float AI_CalcShotDamage (Actor* actor, const Actor* target, const fireDef_t* fd, shoot_types_t shotType)
{
    const int shots = ceil(CALC_DAMAGE_SAMPLES / fd->shots);
    const int zAlign = !fd->gravity && (fd->splrad > 0.0f || target->isStunned()) ? GROUND_DELTA : 0;
    shot_mock_t mock;
    for (int i = 0; i < shots; ++i)
        G_ClientShoot(actor->getPlayer(), actor, target->pos, shotType, fd->fdIdx, &mock, false, zAlign);

    if (mock.damage == 0)
        return 0.0f;

    const int totalCount = mock.enemyCount + mock.friendCount + mock.civilian;
    const int eCount = totalCount - ((actor->isInsane() ? 0 : mock.friendCount)
            + (G_IsAlien(actor) || actor->isInsane() ? 0 : mock.civilian));
    return mock.damage * (static_cast<float>(eCount) / totalCount) / shots;
}

static void AI_FindBestFiredef (AiAction* aia, Actor* actor, Actor* check, const Item* item, shoot_types_t shootType, int tu, float* maxDmg, int* bestTime, const fireDef_t* fdArray)
{
    bool hasLineOfFire = false;
    int shotChecked = NONE;

    const float dist = VectorDist(actor->origin, check->origin);
    for (fireDefIndex_t fdIdx = 0; fdIdx < item->ammoDef()->numFiredefs[fdArray->weapFdsIdx]; fdIdx++) {
        const fireDef_t* fd = &fdArray[fdIdx];
        const int time = G_ActorGetModifiedTimeForFiredef(actor, fd, false);
        /* how many shoots can this actor do */
        const int shots = tu / time;
        if (shots) {
            const bool stunWeapon = (item->def()->dmgtype == gi.csi->damStunElectro || item->def()->dmgtype == gi.csi->damStunGas);
            if (stunWeapon && !actor->isInsane() && (check->isStunned() || CHRSH_IsTeamDefRobot(check->chr.teamDef)))
                return;

            if (!AI_FighterCheckShoot(actor, check, fd, dist))
                continue;

            /*
             * check weapon can hit, we only want to do this once unless the LoF actually changes
             * between shots, only hand grenades seem to do this (rolled vs thrown)
             */
            const int shotFlags = fd->gravity | (fd->launched << 1) | (fd->rolled << 2);
            if (shotChecked != shotFlags) {
                shotChecked = shotFlags;
                hasLineOfFire = AI_CheckLineOfFire(actor, check, fd, shots);
            }
            if (!hasLineOfFire)
                continue;

            /* calculate expected damage */
            float dmg = AI_CalcShotDamage(actor, check, fd, shootType) * shots;

            /* It is said that there is no kill like overkill but... */
            dmg = std::min(dmg, check->HP * SCORE_DAMAGE_FACTOR) * SCORE_DAMAGE / check->HP;

            if (dmg > check->HP && check->isReaction())
                /* reaction shooters eradication bonus */
                dmg = check->HP + SCORE_KILL + SCORE_REACTION_ERADICATION;
            else if (dmg > check->HP)
                /* standard kill bonus */
                dmg = check->HP + SCORE_KILL;

            /* ammo is limited and shooting gives away your position */
            if (dmg < check->HP * SCORE_DAMAGE_WORTH_FACTOR)
                continue;

            /* Reaction fire malus */
            if (!actor->isInsane() && check->isReaction() && G_ActorVis(check, actor, true) > ACTOR_VIS_0)
                dmg -= SCORE_REACTION_FEAR_FACTOR;

            /* civilian malus */
            if (G_IsCivilian(check) && !actor->isRaged())
                dmg *= SCORE_CIV_FACTOR;

            /* Stunned malus */
            if (check->isStunned() && !actor->isRaged())
                dmg *= SCORE_DISABLED_FACTOR;

            /* add random effects */
            if (dmg > 0)
                dmg += SCORE_RANDOM * frand();

            /* check if most damage can be done here */
            if (dmg > *maxDmg) {
                *maxDmg = dmg;
                *bestTime = time * shots;
                aia->shootType = shootType;
                aia->shots = shots;
                aia->target = check;
                aia->fd = fd;
                if (!fd->gravity && (fd->splrad > 0.0f || check->isStunned()))
                    aia->z_align = GROUND_DELTA;
                else
                    aia->z_align = 0;
            }

            if (!aia->target) {
                aia->target = AI_SearchDestroyableObject(actor, fd);
                if (aia->target) {
                    /* don't take vis into account, don't multiply with amount of shots
                     * others (human victims) should be preferred, that's why we don't
                     * want a too high value here */
                    *maxDmg = (fd->damage[0] + fd->spldmg[0]);
                    *bestTime = time * shots;
                    aia->shootType = shootType;
                    aia->shots = shots;
                    aia->fd = fd;
                }
            }
        }
    }
}

bool AI_IsHostile (const Actor* actor, const Edict* target)
{
    if (actor == target)
        return false;

    if (actor->isInsane())
        return true;

    if (!target->isOpponent(actor))
        return false;

    /* don't shoot civs in multiplayer */
    if (G_IsMultiPlayer())
        return !G_IsCivilian(target);

    return true;
}

const invDef_t* AI_SearchGrenade (const Actor* actor, Item** ip)
{
    /* search for grenades and select the one that is available easily */
    const Container* cont = nullptr;
    const invDef_t* bestContainer = nullptr;
    Item* weapon = nullptr;
    int cost = 100;
    while ((cont = actor->chr.inv.getNextCont(cont, true))) {
        if (cont->def()->out >= cost)
            continue;
        Item* item = nullptr;
        while ((item = cont->getNextItem(item))) {
            assert(item->def());
            const objDef_t* obj = item->def();
            if (item->isWeapon() && !item->mustReload() && ((obj->thrown && obj->oneshot && obj->deplete)
                || Q_streq(obj->type, "grenade"))) {
                weapon = item;
                bestContainer = cont->def();
                cost = bestContainer->out;
                break;
            }
        }
    }

    *ip = weapon;
    return bestContainer;
}

static bool AI_IsHandForForShootTypeFree (shoot_types_t shootType, Actor* actor)
{
    if (!IS_SHOT_REACTION(shootType)) {
        if (IS_SHOT_RIGHT(shootType)) {
            const Item* item = actor->getRightHandItem();
            return item == nullptr;
        }
        if (IS_SHOT_LEFT(shootType)) {
            const Item* left = actor->getLeftHandItem();
            const Item* right = actor->getRightHandItem();
            return left == nullptr && (right == nullptr || !right->isHeldTwoHanded());
        }
    }

    return false;
}

static int AI_CheckForMissionTargets (Actor* actor, const pos3_t pos)
{
    int bestActionScore = AI_ACTION_NOTHING_FOUND;
    int actionScore = 0;
    pos3_t oldPos;

    VectorCopy(pos, oldPos);
    actor->setOrigin(pos);
    if (G_IsCivilian(actor)) {
        Edict* checkPoint = nullptr;
        int i = 0;
        /* find waypoints in a closer distance - if civilians are not close enough, let them walk
         * around until they came close */
        for (checkPoint = level.ai_waypointList; checkPoint != nullptr; checkPoint = checkPoint->groupChain) {
            if (!checkPoint->inuse)
                continue;

            /* the lower the count value - the nearer the final target */
            if (checkPoint->count < actor->count) {
                if (VectorDist(actor->origin, checkPoint->origin) <= WAYPOINT_CIV_DIST) {
                    const int actorTUs = actor->getUsableTUs();
                    const int length = actorTUs - G_ActorMoveLength(actor, level.pathingMap, actor->pos, true);
                    i++;

                    /* test for time and distance */
                    actionScore = SCORE_MISSION_TARGET + length;

                    /* Don't walk to enemy ambush */
                    Actor* check = nullptr;
                    while ((check = G_EdictsGetNextLivingActorOfTeam(check, TEAM_ALIEN))) {
                        const float dist = VectorDist(actor->origin, check->origin);
                        /* @todo add visibility check here? */
                        if (dist < RUN_AWAY_DIST)
                            actionScore -= SCORE_RUN_AWAY;
                    }
                    if (actionScore > bestActionScore) {
                        bestActionScore = actionScore;
                        actor->count = checkPoint->count;
                    }
                }
            }
        }
        /* reset the count value for this civilian to restart the search */
        if (!i)
            actor->count = 100;
    } else if (G_IsAlien(actor)) {
        /* search for a mission edict */
        Edict* mission = nullptr;
        while ((mission = G_EdictsGetNextInUse(mission))) {
            if (mission->type != ET_MISSION)
                continue;
            if (mission->pos[2] != actor->pos[2])
                continue;
            const int radius = mission->radius / (UNIT_SIZE + 1);
            const int distX = std::abs(actor->pos[0] - mission->pos[0]);
            const int distY = std::abs(actor->pos[1] - mission->pos[1]);
            const int dists = std::max(distX, distY);
            if (actor->getTeam() == mission->getTeam()) {
                actionScore = SCORE_MISSION_TARGET / (dists > radius ? dists - radius : 1);
            } else {
                /* try to prevent the phalanx from reaching their mission target */
                actionScore = SCORE_MISSION_OPPONENT_TARGET / (dists > radius ? dists - radius : 1);
            }

            if (actionScore > bestActionScore) {
                bestActionScore = actionScore;
            }
        }
    }

    actor->setOrigin(oldPos);
    return bestActionScore > AI_ACTION_NOTHING_FOUND ? bestActionScore : 0;
}

static float AI_FighterCalcActionScore (Actor* actor, const pos3_t to, AiAction* aia)
{
    const pos_t move = G_ActorMoveLength(actor, level.pathingMap, to, true);
    if (move == ROUTING_NOT_REACHABLE)
        return AI_ACTION_NOTHING_FOUND;

    int tu = actor->getUsableTUs() - move;
    /* test for time */
    if (tu < 0)
        return AI_ACTION_NOTHING_FOUND;

    /* set basic parameters */
    aia->reset();
    VectorCopy(to, aia->to);
    VectorCopy(to, aia->stop);
    actor->setOrigin(aia->to);

    /* pre-find a grenade */
    Item* grenade = nullptr;
    const invDef_t* fromCont = AI_SearchGrenade(actor, &grenade);

    /* search best target */
    float maxDmg = 0.0f;
    float bestActionScore = 0.0f;
    int bestTime = -1;
    Actor* check = nullptr;

    while ((check = G_EdictsGetNextLivingActor(check))) {
        if (check->isSamePosAs(aia->to) || !AI_IsHostile(actor, check))
            continue;

        if (!G_IsVisibleForTeam(check, actor->getTeam()) && G_ActorVis(actor, check, true) < ACTOR_VIS_10)
            continue;

        /* shooting */
        for (shoot_types_t shootType = ST_RIGHT; shootType < ST_NUM_SHOOT_TYPES; shootType++) {
            const bool freeHand = AI_IsHandForForShootTypeFree(shootType, actor);
            const Item* item = freeHand ? grenade : AI_GetItemForShootType(shootType, actor);
            if (!item)
                continue;

            const fireDef_t* fdArray = item->getFiredefs();
            if (fdArray == nullptr)
                continue;

            const invDef_t* toCont = INVDEF_FOR_SHOOTTYPE(shootType);
            const int invMoveCost = freeHand && grenade ? fromCont->out + toCont->in : 0;
            AI_FindBestFiredef(aia, actor, check, item, shootType, tu - invMoveCost, &maxDmg, &bestTime, fdArray);
            if (aia->shootType == shootType)
                bestTime += invMoveCost;
        }
    }
    /* add damage to bestActionScore */
    if (aia->target) {
        bestActionScore += maxDmg;
        assert(bestTime > 0);
        tu -= bestTime;
    }

    /* Try not to stand in dangerous terrain (eg. fireField) */
    if (!AI_CheckPosition(actor, aia->to))
        bestActionScore -= SCORE_NOSAFE_POSITION_PENALTY;

    if (!actor->isRaged()) {
        const int hidingTeam = AI_GetHidingTeam(actor);
        /* hide */
        if (!AI_HideNeeded(actor)) {
            /* is a hiding spot */
            bestActionScore += SCORE_HIDE + (aia->target ? SCORE_CLOSE_IN + SCORE_REACTION_FEAR_FACTOR : 0);
        } else if (aia->target && tu >= TU_MOVE_STRAIGHT) {
            /* reward short walking to shooting spot, when seen by enemies; */
            bestActionScore += std::max(SCORE_CLOSE_IN - move, 0);

            if (!AI_FindHidingLocation(hidingTeam, actor, aia->to, tu)) {
                /* nothing found */
                actor->setOrigin(aia->to);
            } else {
                /* found a hiding spot */
                VectorCopy(actor->pos, aia->stop);
                actor->calcOrigin();
                bestActionScore += SCORE_HIDE;
            }
        }
    } else {
        if (aia->target)
            bestActionScore += aia->shots * SCORE_RAGE - move;
        else
            bestActionScore += move;
    }

    if (aia->target) {
        const float dist = VectorDist(actor->origin, aia->target->origin);
        bestActionScore += SCORE_CLOSE_IN * (1.0f - dist / CLOSE_IN_DIST);
    } else if (actor->isRaged()) {
        /* reward closing in */
        float minDist = CLOSE_IN_DIST;
        check = nullptr;
        while ((check = G_EdictsGetNextLivingActor(check))) {
            if (!check->isSameTeamAs(actor)) {
                const float dist = VectorDist(actor->origin, check->origin);
                minDist = std::min(dist, minDist);
            }
        }
        bestActionScore += SCORE_CLOSE_IN * (1.0f - minDist / CLOSE_IN_DIST);
    } else {
        /* if no target available let them wander around until they find one */
        bestActionScore += SCORE_RANDOM * frand();
    }

    /* Reward getting to mission objectives */
    if (!actor->isRaged())
        bestActionScore += AI_CheckForMissionTargets(actor, to);

    /* penalize herding */
    if (!actor->isRaged()) {
        check = nullptr;
        while ((check = G_EdictsGetNextLivingActorOfTeam(check, actor->getTeam()))) {
            const float dist = VectorDist(actor->origin, check->origin);
            if (dist < HERD_THRESHOLD)
                bestActionScore -= SCORE_HERDING_PENALTY;
        }
    }

    return bestActionScore;
}

static float AI_CivilianCalcActionScore (Actor* actor, const pos3_t to, AiAction* aia)
{
    const pos_t move = G_ActorMoveLength(actor, level.pathingMap, to, true);
    const int tu = actor->getUsableTUs() - move;

    /* test for time */
    if (tu < 0 || move == ROUTING_NOT_REACHABLE)
        return AI_ACTION_NOTHING_FOUND;

    /* set basic parameters */
    aia->reset();
    VectorCopy(to, aia->to);
    VectorCopy(to, aia->stop);
    actor->setOrigin(to);

    /* check whether this civilian can use weapons */
    if (actor->chr.teamDef) {
        const teamDef_t* teamDef = actor->chr.teamDef;
        if (!actor->isPanicked() && teamDef->weapons)
            return AI_FighterCalcActionScore(actor, to, aia);
    } else
        gi.DPrintf("AI_CivilianCalcActionScore: Error - civilian team with no teamdef\n");

    /* run away */
    float minDist, minDistCivilian, minDistFighter;
    minDist = minDistCivilian = minDistFighter = RUN_AWAY_DIST * UNIT_SIZE;

    Actor* check = nullptr;
    while ((check = G_EdictsGetNextLivingActor(check))) {
        float dist;
        if (actor == check)
            continue;
        dist = VectorDist(actor->origin, check->origin);
        /* if we are trying to walk to a position that is occupied by another actor already we just return */
        if (!dist)
            return AI_ACTION_NOTHING_FOUND;
        switch (check->getTeam()) {
        case TEAM_ALIEN:
            if (dist < minDist)
                minDist = dist;
            break;
        case TEAM_CIVILIAN:
            if (dist < minDistCivilian)
                minDistCivilian = dist;
            break;
        case TEAM_PHALANX:
            if (dist < minDistFighter)
                minDistFighter = dist;
            break;
        }
    }

    minDist /= UNIT_SIZE;
    minDistCivilian /= UNIT_SIZE;
    minDistFighter /= UNIT_SIZE;

    float delta;
    if (minDist < 8.0) {
        /* very near an alien: run away fast */
        delta = 4.0 * minDist;
    } else if (minDist < 16.0) {
        /* near an alien: run away */
        delta = 24.0 + minDist;
    } else if (minDist < 24.0) {
        /* near an alien: run away slower */
        delta = 40.0 + (minDist - 16) / 4;
    } else {
        delta = 42.0;
    }
    /* near a civilian: join him (1/3) */
    if (minDistCivilian < 10.0)
        delta += (10.0 - minDistCivilian) / 3.0;
    /* near a fighter: join him (1/5) */
    if (minDistFighter < 15.0)
        delta += (15.0 - minDistFighter) / 5.0;
    /* don't go close to a fighter to let him move */
    if (minDistFighter < 2.0)
        delta /= 10.0;

    /* try to hide */
    float reactionTrap = 0.0;
    if (!actor->isInsane()) {
        check = nullptr;
        while ((check = G_EdictsGetNextLivingActor(check))) {
            if (actor == check)
                continue;
            if (!(G_IsAlien(check)))
                continue;

            if (G_ActorVis(check, actor, true) > ACTOR_VIS_10)
                reactionTrap += SCORE_NONHIDING_PLACE_PENALTY;
        }
    }
    delta -= reactionTrap;
    float bestActionScore = delta;

    /* Try not to stand in dangerous terrain */
    if (!AI_CheckPosition(actor, actor->pos))
        bestActionScore -= SCORE_NOSAFE_POSITION_PENALTY;

    /* Approach waypoints */
    bestActionScore += AI_CheckForMissionTargets(actor, actor->pos);

    /* add laziness */
    if (actor->getTus())
        bestActionScore += SCORE_CIV_LAZINESS * tu / actor->getTus();
    /* add random effects */
    bestActionScore += SCORE_CIV_RANDOM * frand();

    return bestActionScore;
}

static float AI_PanicCalcActionScore (Actor* actor, const pos3_t to, AiAction* aia)
{
    const pos_t move = G_ActorMoveLength(actor, level.pathingMap, to, true);
    const int tu = actor->getUsableTUs() - move;

    /* test for time */
    if (tu < 0 || move == ROUTING_NOT_REACHABLE)
        return AI_ACTION_NOTHING_FOUND;

    /* set basic parameters */
    aia->reset();
    VectorCopy(to, aia->to);
    VectorCopy(to, aia->stop);
    actor->setOrigin(to);

    /* run away */
    float minDistFriendly, minDistOthers;
    minDistFriendly = minDistOthers = RUN_AWAY_DIST * UNIT_SIZE;

    Actor* check = nullptr;
    while ((check = G_EdictsGetNextLivingActor(check))) {
        float dist;
        if (actor == check)
            continue;
        dist = VectorDist(actor->origin, check->origin);
        /* if we are trying to walk to a position that is occupied by another actor already we just return */
        if (!dist)
            return AI_ACTION_NOTHING_FOUND;
        if (check->isSameTeamAs(actor)) {
            if (dist < minDistFriendly)
                minDistFriendly = dist;
        } else {
            if (dist < minDistOthers)
                minDistOthers = dist;
        }
    }

    minDistFriendly /= UNIT_SIZE;
    minDistOthers /= UNIT_SIZE;

    float bestActionScore = SCORE_PANIC_RUN_TO_FRIENDS / minDistFriendly;
    bestActionScore -= SCORE_PANIC_FLEE_FROM_STRANGERS / minDistOthers;

    /* try to hide */
    check = nullptr;
    if (!actor->isInsane())
        while ((check = G_EdictsGetNextLivingActor(check))) {
            if (actor == check)
                continue;

            if (G_ActorVis(check, actor, true) > ACTOR_VIS_10)
                bestActionScore -= SCORE_NONHIDING_PLACE_PENALTY;
        }

    /* Try not to stand in dangerous terrain */
    if (!AI_CheckPosition(actor, actor->pos))
        bestActionScore -= SCORE_NOSAFE_POSITION_PENALTY;

    /* add random effects */
    bestActionScore += SCORE_PANIC_RANDOM * frand();

    return bestActionScore;
}

bool AI_FindMissionLocation (Actor* actor, const pos3_t to, int tus, int radius)
{
    int bestDist = ROUTING_NOT_REACHABLE;
    pos3_t bestPos = {to[0], to[1], to[2]};

    AiAreaSearch searchArea(to, radius, true);
    while (searchArea.getNext(actor->pos)) {
        const pos_t length = G_ActorMoveLength(actor, level.pathingMap, actor->pos, true);
        /* Can't walk there */
        if (length == ROUTING_NOT_REACHABLE || length > tus)
            continue;
        /* Don't stand on dangerous terrain! */
        if (!AI_CheckPosition(actor, actor->pos))
            continue;

        const int distX = std::abs(actor->pos[0] - to[0]);
        const int distY = std::abs(actor->pos[1] - to[1]);
        const int dist = std::max(distX, distY);
        if (dist < bestDist) {
            bestDist = dist;
            VectorCopy(actor->pos, bestPos);
        }
    }
    if (!VectorCompare(to, bestPos))
        VectorCopy(bestPos, actor->pos);

    return bestDist < ROUTING_NOT_REACHABLE;
}

static AiAction AI_PrepBestAction (const Player& player, Actor* actor)
{
    /* calculate move table */
    const int maxTU = actor->getUsableTUs();
    G_MoveCalc(0, actor, actor->pos, maxTU);
    Com_DPrintf(DEBUG_ENGINE, "AI_PrepBestAction: Called MoveMark.\n");
    gi.MoveStore(level.pathingMap);

    /* set borders */
    const int dist = (maxTU + 1) / TU_MOVE_STRAIGHT;

    /* search best action */
    pos3_t oldPos;
    vec3_t oldOrigin;
    VectorCopy(actor->pos, oldPos);
    VectorCopy(actor->origin, oldOrigin);

    /* evaluate moving to every possible location in the search area,
     * including combat considerations */
    float bestActionScore, best = AI_ACTION_NOTHING_FOUND;
    AiAction aia, bestAia;
    pos3_t to;
    AiAreaSearch searchArea(oldPos, dist);
    while (searchArea.getNext(to)) {
        const pos_t move = G_ActorMoveLength(actor, level.pathingMap, to, true);
        if (move >= ROUTING_NOT_REACHABLE)
            continue;
        if (move > maxTU)
            continue;

        if (G_IsCivilian(actor))
            bestActionScore = AI_CivilianCalcActionScore(actor, to, &aia);
        else if (actor->isPanicked())
            bestActionScore = AI_PanicCalcActionScore(actor, to, &aia);
        else
            bestActionScore = AI_FighterCalcActionScore(actor, to, &aia);

        if (bestActionScore > best) {
            bestAia = aia;
            best = bestActionScore;
        }
    }

    VectorCopy(oldPos, actor->pos);
    VectorCopy(oldOrigin, actor->origin);

    /* nothing found to do */
    if (best == AI_ACTION_NOTHING_FOUND) {
        bestAia.target = nullptr;
        return bestAia;
    }

    /* do the move */
    for (;;) {
        if (actor->isDead())
            break;
        G_ClientMove(player, 0, actor, bestAia.to);
        if (actor->isSamePosAs(bestAia.to))
            break;
        const pos_t length = G_ActorMoveLength(actor, level.pathingMap, bestAia.to, false);
        if (length > actor->getUsableTUs() || length >= ROUTING_NOT_REACHABLE)
            break;
    }
    /* test for possible death during move. reset bestAia due to dead status */
    if (actor->isDead())
        bestAia.reset();

    /* if we are throwing a grenade from the inventory grab it now */
    if (bestAia.target && AI_IsHandForForShootTypeFree(bestAia.shootType, actor)) {
        Item* grenade = nullptr;
        const invDef_t* fromCont = AI_SearchGrenade(actor, &grenade);
        const invDef_t* toCont = INVDEF_FOR_SHOOTTYPE(bestAia.shootType);
        if (!grenade || !fromCont || !toCont || !G_ActorInvMove(actor, fromCont, grenade, toCont, NONE, NONE, true))
            bestAia.target = nullptr;
    }

    return bestAia;
}

void G_AddToWayPointList (Edict* ent)
{
    if (!level.ai_waypointList) {
        level.ai_waypointList = ent;
        return;
    }

    Edict* e = level.ai_waypointList;
    while (e->groupChain) {
        e = e->groupChain;
    }
    e->groupChain = ent;
}

void AI_TurnIntoDirection (Actor* actor, const pos3_t pos)
{
    const byte crouchingState = actor->isCrouched() ? 1 : 0;
    G_MoveCalc(actor->getTeam(), actor, pos, actor->getUsableTUs());

    const int dvec = gi.MoveNext(level.pathingMap, pos, crouchingState);
    if (dvec != ROUTING_UNREACHABLE) {
        const byte dir = getDVdir(dvec);
        /* Only attempt to turn if the direction is not a vertical only action */
        if (dir < CORE_DIRECTIONS || dir >= FLYING_DIRECTIONS)
            G_ActorDoTurn(actor, dir & (CORE_DIRECTIONS - 1));
    }
}

bool AI_TryToReloadWeapon (Actor* actor, containerIndex_t containerID)
{
    if (G_ClientCanReload(actor, containerID)) {
        return G_ActorReload(actor, INVDEF(containerID));
    } else {
        G_ActorInvMove(actor, INVDEF(containerID), actor->getContainer(containerID), INVDEF(CID_FLOOR), NONE, NONE, true);
        G_ReactionFireSettingsUpdate(actor, actor->chr.RFmode.getFmIdx(), actor->chr.RFmode.getHand(), actor->chr.RFmode.getWeapon());
    }
    return false;
}

static void AI_ActorThink (Player& player, Actor* actor)
{
    /* if a weapon can be reloaded we attempt to do so if TUs permit, otherwise drop it */
    Item* rightH = actor->getRightHandItem();
    Item* leftH = actor->getLeftHandItem();
    if (!actor->isPanicked()) {
        if (rightH && rightH->mustReload())
            AI_TryToReloadWeapon(actor, CID_RIGHT);
        if (leftH && leftH->mustReload())
            AI_TryToReloadWeapon(actor, CID_LEFT);
    }

    /* if both hands are empty, attempt to get a weapon out of backpack or the
     * floor (if TUs permit) */
    if (!actor->getLeftHandItem() && !actor->getRightHandItem())
        G_ClientGetWeaponFromInventory(actor);

    AiAction bestAia = AI_PrepBestAction(player, actor);

    /* shoot and hide */
    if (bestAia.target) {
        const fireDefIndex_t fdIdx = bestAia.fd ? bestAia.fd->fdIdx : 0;
        /* shoot until no shots are left or target died */
        while (bestAia.shots) {
            G_ClientShoot(player, actor, bestAia.target->pos, bestAia.shootType, fdIdx, nullptr, true, bestAia.z_align);
            bestAia.shots--;
            /* died by our own shot? */
            if (actor->isDead())
                return;
            /* check for target's death */
            if (G_IsDead(bestAia.target)) {
                /* search another target now */
                bestAia = AI_PrepBestAction(player, actor);
                /* no other target found - so no need to hide */
                if (!bestAia.target)
                    return;
            }
        }
        actor->hiding = true;

        /* now hide - for this we use the team of the alien actor because a phalanx soldier
         * might become visible during the hide movement */
        G_ClientMove(player, actor->getTeam(), actor, bestAia.stop);
        /* no shots left, but possible targets left - maybe they shoot back
         * or maybe they are still close after hiding */

        /* decide whether the actor wants to crouch */
        if (AI_CheckCrouch(actor))
            G_ClientStateChange(player, actor, STATE_CROUCHED, true);

        /* actor is still alive - try to turn into the appropriate direction to see the target
         * actor once he sees the ai, too */
        AI_TurnIntoDirection(actor, bestAia.target->pos);

        /* G_ClientStateChange(player, actor->number, STATE_REACTION_ONCE, true); */

        actor->hiding = false;
    }
}

void AI_ActorRun (Player& player, Actor* actor)
{
    if (g_ailua->integer)
        AIL_ActorThink(player, actor);
    else
        AI_ActorThink(player, actor);
}

#if 0
#include "g_ai2.cpp"
#else
static bool AI_TeamThink (Player& player)
{
    return false;
}
#endif

static void AI_PlayerRun (Player& player)
{
    if (level.activeTeam != player.getTeam() || player.roundDone)
        return;

    if (g_ailua->integer > 1) {
        if (AIL_TeamThink(player))
            /* did some thinking, come back next time */
            return;
        /* finished thinking, end round */
    }
     else if (player.getTeam() == TEAM_PHALANX && g_aihumans->integer == 2) {
        if (AI_TeamThink(player))
            return;     /* did some thinking, come back next frame */
        /* finished thinking, end round */
    }
    else {
        /* find next actor to handle */
        Actor* actor = player.pers.getLastActor();
        while ((actor = G_EdictsGetNextLivingActorOfTeam(actor, player.getTeam()))) {
            const int beforeTUs = actor->getTus();
            if (beforeTUs > 0) {
                AI_ActorRun(player, actor);
                player.pers.setLastActor(actor);

                if (beforeTUs > actor->getTus())
                    return;
            }
        }
    }

    /* nothing left to do, request endround */
    G_ClientEndRound(player);
    player.pers.setLastActor(nullptr);
}

void AI_Run (void)
{
    /* don't run this too often to prevent overflows */
    if (level.framenum % 10)
        return;

    /* set players to ai players and cycle over all of them */
    Player* player = nullptr;
    while ((player = G_PlayerGetNextActiveAI(player))) {
        AI_PlayerRun(*player);
    }

    if (g_aihumans->integer) {
        player = nullptr;
        while ((player = G_PlayerGetNextActiveHuman(player))) {
            AI_PlayerRun(*player);
        }
    }
}

static void AI_SetStats (Actor* actor, int team)
{
    const char* templateId = "";
    if (team != TEAM_CIVILIAN && gi.csi->numAlienTeams) {
        for (int i = 0; i < gi.csi->numAlienTeams; ++i) {
            if (gi.csi->alienTeams[i] == actor->chr.teamDef && gi.csi->alienChrTemplates[i]) {
                templateId = gi.csi->alienChrTemplates[i]->id;
                break;
            }
        }
    }

    CHRSH_CharGenAbilitySkills(&actor->chr, G_IsMultiPlayer(), templateId);

    actor->HP = actor->chr.HP;
    actor->setMorale(actor->chr.morale);
    actor->setStun(0);

    /* hurt aliens in ufo crash missions (5%: almost dead, 10%: wounded, 15%: stunned)  */
    if (level.hurtAliens && CHRSH_IsTeamDefAlien(actor->chr.teamDef)) {
        const float random = frand();
        int damage = 0, stun = 0;
        if (random <= 0.05f) {
            damage = actor->HP * 0.95f;
        } else if (random <= 0.15f) {
            stun = actor->HP * 0.3f;
            damage = actor->HP * 0.5f;
        } else if (random <= 0.3f) {
            stun = actor->HP * 0.75f;
        }
        actor->HP -= damage;
        if (!CHRSH_IsTeamDefRobot(actor->chr.teamDef))
            actor->setStun(stun);

        for (int i = 0; i < actor->chr.teamDef->bodyTemplate->numBodyParts(); ++i)
            actor->chr.wounds.treatmentLevel[actor->chr.teamDef->bodyTemplate->getRandomBodyPart()] += damage / BODYPART_MAXTYPE;
    }

    G_ActorGiveTimeUnits(actor);
}

static void AI_SetCharacterValues (Edict* ent, int team)
{
    /* Set model. */
    const char* teamDefinition;
    if (team != TEAM_CIVILIAN) {
        if (gi.csi->numAlienTeams) {
            const int alienTeam = rand() % gi.csi->numAlienTeams;
            const teamDef_t* td = gi.csi->alienTeams[alienTeam];
            assert(td);
            teamDefinition = td->id;
        } else {
            teamDefinition = gi.Cvar_String("ai_alienteam");
        }
    } else {
        teamDefinition = gi.Cvar_String("ai_civilianteam");
    }
    gi.GetCharacterValues(teamDefinition, &ent->chr);
    if (!ent->chr.teamDef)
        gi.Error("Could not set teamDef for character: '%s'", teamDefinition);
}


static void AI_SetEquipment (Edict* ent, const equipDef_t* ed)
{
    /* Pack equipment. */
    game.invi.EquipActor(&ent->chr, ed, ent->chr.teamDef->onlyWeapon, ent->chr.score.skills[ABILITY_POWER]);
}

static void AI_InitPlayer (const Player& player, Actor* actor, const equipDef_t* ed)
{
    const int team = player.getTeam();

    /* Set the model and chose alien race. */
    AI_SetCharacterValues(actor, team);

    /* Calculate stats. */
    AI_SetStats(actor, team);

    /* Give equipment. */
    if (ed != nullptr)
        AI_SetEquipment(actor, ed);

    /* after equipping the actor we can also get the model indices */
    actor->setBody(gi.ModelIndex(CHRSH_CharGetBody(&actor->chr)));
    actor->setHead(gi.ModelIndex(CHRSH_CharGetHead(&actor->chr)));

    /* no need to call G_SendStats for the AI - reaction fire is serverside only for the AI */
    if (frand() < 0.75f) {
        G_ClientStateChange(player, actor, STATE_REACTION, false);
    }

    /* initialize the LUA AI now */
    AIL_InitActor(actor);
}

static const equipDef_t* G_GetEquipmentForAISpawn (int team)
{
    /* prepare equipment */
    if (team == TEAM_CIVILIAN)
        return nullptr;

    const char* equipID = gi.Cvar_String("ai_equipment");
    const equipDef_t* ed = G_GetEquipDefByID(equipID);
    if (ed == nullptr)
        ed = &gi.csi->eds[0];
    return ed;
}

static Actor* G_SpawnAIPlayer (const Player& player, const equipDef_t* ed)
{
    Actor* actor = G_ClientGetFreeSpawnPointForActorSize(player, ACTOR_SIZE_NORMAL);
    if (!actor) {
        gi.DPrintf("Not enough spawn points for team %i\n", player.getTeam());
        return nullptr;
    }

    /* initialize the new actor */
    AI_InitPlayer(player, actor, ed);

    G_TouchTriggers(actor);

    gi.DPrintf("Spawned ai player for team %i with entnum %i (%s)\n", actor->getTeam(), actor->getIdNum(), actor->chr.name);
    G_CheckVis(actor, VT_PERISHCHK | VT_NEW);
    G_CheckVisTeamAll(actor->getTeam(), 0, actor);

    return actor;
}

static void G_SpawnAIPlayers (const Player& player, int numSpawn)
{
    const equipDef_t* ed = G_GetEquipmentForAISpawn(player.getTeam());

    for (int i = 0; i < numSpawn; i++) {
        if (G_SpawnAIPlayer(player, ed) == nullptr)
            break;
    }

    /* show visible actors */
    G_VisFlagsClear(player.getTeam());
    G_CheckVis(nullptr, 0);
}

void AI_CheckRespawn (int team)
{
    if (!g_endlessaliens->integer)
        return;

    if (team != TEAM_ALIEN)
        return;

    const int spawned = level.initialAlienActorsSpawned;
    const int alive = level.num_alive[team];
    int diff = spawned - alive;
    const equipDef_t* ed = G_GetEquipmentForAISpawn(team);

    while (diff > 0) {
        const Player* player = G_GetPlayerForTeam(team);
        Actor* actor = G_SpawnAIPlayer(*player, ed);
        if (actor == nullptr)
            break;

        /* Some events need the actor added to the client before they are even *parsed*
         * - namely all the ones that rely on step times */
        G_EventActorAdd(PM_ALL, *actor, true);
        const playermask_t playerMask = G_VisToPM(actor->visflags);
        G_AppearPerishEvent(playerMask, true, *actor, nullptr);

        diff--;
    }
}

Player* AI_CreatePlayer (int team)
{
    if (!sv_ai->integer) {
        gi.DPrintf("AI deactivated - set sv_ai cvar to 1 to activate it\n");
        return nullptr;
    }

    /* set players to ai players and cycle over all of them */
    Player* p = nullptr;
    while ((p = G_PlayerGetNextAI(p))) {
        if (p->isInUse())
            continue;
        p->reset();
        p->setInUse(true);
        p->setNum(p - game.players);
        p->pers.ai = true;
        G_SetTeamForPlayer(*p, team);
        if (p->getTeam() == TEAM_CIVILIAN) {
            G_SpawnAIPlayers(*p, ai_numcivilians->integer);
        } else {
            if (G_IsSinglePlayer())
                G_SpawnAIPlayers(*p, ai_singleplayeraliens->integer);
            else
                G_SpawnAIPlayers(*p, ai_multiplayeraliens->integer);

            level.initialAlienActorsSpawned = level.num_spawned[p->getTeam()];
        }

        gi.DPrintf("Created AI player (team %i)\n", p->getTeam());
        return p;
    }

    /* nothing free */
    return nullptr;
}