cl_hud.cpp

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/*
Copyright (C) 2002-2025 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 "../client.h"
#include "cl_localentity.h"
#include "cl_actor.h"
#include "cl_hud.h"
#include "cl_hud_callbacks.h"
#include "cl_view.h"
#include "../cgame/cl_game.h"
#include "../ui/ui_main.h"
#include "../ui/ui_popup.h"
#include "../ui/ui_nodes.h"
#include "../ui/ui_draw.h"
#include "../ui/ui_render.h"
#include "../ui/ui_tooltip.h"
#include "../renderer/r_mesh_anim.h"
#include "../renderer/r_draw.h"
#include "../../common/grid.h"
 
static cvar_t* cl_hud_message_timeout;
static cvar_t* cl_show_cursor_tooltips;
static cvar_t* cl_hud;
cvar_t* cl_worldlevel;
 
enum {
    REMAINING_TU_RELOAD_RIGHT,
    REMAINING_TU_RELOAD_LEFT,
    REMAINING_TU_CROUCH,
 
    REMAINING_TU_MAX
};
static bool displayRemainingTus[REMAINING_TU_MAX];
 
typedef enum {
    BT_RIGHT_FIRE,
    BT_REACTION,
    BT_LEFT_FIRE,
    BT_RIGHT_RELOAD,
    BT_LEFT_RELOAD,
    BT_STAND,
    BT_CROUCH,
    BT_HEADGEAR,
 
    BT_NUM_TYPES
} buttonTypes_t;
 
typedef enum {
    FIRE_RIGHT,
    FIRE_LEFT,
    RELOAD_RIGHT,
    RELOAD_LEFT
} actionType_t;

static char const* const shootTypeStrings[] = {
    "primaryright",
    "reaction",
    "primaryleft",
    "reloadright",
    "reloadleft",
    "stand",
    "crouch",
    "headgear"
};
CASSERT(lengthof(shootTypeStrings) == BT_NUM_TYPES);

typedef enum {
    BT_STATE_UNINITIALZED,
    BT_STATE_DISABLE,       
    BT_STATE_DESELECT,      
    BT_STATE_SELECT         
} weaponButtonState_t;

static char const* const moveModeDescriptions[] = {
    N_("Crouch walk"),
    N_("Autostand"),
    N_("Walk"),
    N_("Crouch walk")
};
CASSERT(lengthof(moveModeDescriptions) == WALKTYPE_MAX);
 
typedef struct reserveShot_s {
    actorHands_t hand;
    int fireModeIndex;
    int weaponIndex;
    int TUs;
} reserveShot_t;
 
typedef enum {
    BUTTON_TURESERVE_UNINITIALIZED,
 
    BUTTON_TURESERVE_SHOT_RESERVED,
    BUTTON_TURESERVE_SHOT_DISABLED,
    BUTTON_TURESERVE_SHOT_CLEAR,
 
    BUTTON_TURESERVE_CROUCH_RESERVED,
    BUTTON_TURESERVE_CROUCH_DISABLED,
    BUTTON_TURESERVE_CROUCH_CLEAR
} reserveButtonState_t;
 
static weaponButtonState_t buttonStates[BT_NUM_TYPES];
static reserveButtonState_t shotReserveButtonState;
static reserveButtonState_t crouchReserveButtonState;

void HUD_DisplayMessage (const char* text)
{
    assert(text);
    UI_DisplayNotice(text, cl_hud_message_timeout->integer, cl_hud->string);
}
 
void HUD_UpdateActorStats (const le_t* le)
{
    if (LE_IsDead(le))
        return;
 
    const Item* item = le->getRightHandItem();
    if ((!item || !item->def() || !item->isHeldTwoHanded()) && le->getLeftHandItem())
        item = le->getLeftHandItem();
 
    const character_t* chr = CL_ActorGetChr(le);
    assert(chr);
    const char* tooltip = va(_("%s\nHP: %i/%i TU: %i\n%s"),
        chr->name, le->HP, le->maxHP, le->TU, (item && item->def()) ? _(item->def()->name) : "");
 
    const int idx = CL_ActorGetNumber(le);
    const int reservedTUs = CL_ActorReservedTUs(le, RES_ALL_ACTIVE);
    UI_ExecuteConfunc("updateactorvalues %i \"%s\" \"%i\" \"%i\" \"%i\" \"%i\" \"%i\" \"%i\" \"%i\" \"%i\" \"%i\" \"%s\"",
            idx, le->model2->name, le->headSkin, le->HP, le->maxHP, le->TU, le->maxTU, le->morale, le->maxMorale, le->STUN, reservedTUs, tooltip);
}

static void HUD_SetWeaponButton (buttonTypes_t button, weaponButtonState_t state)
{
    if (buttonStates[button] == state)
        return;
 
    const char* prefix;
 
    switch (state) {
    case BT_STATE_DESELECT:
        prefix = "deselect_";
        break;
    case BT_STATE_DISABLE:
        prefix = "disable_";
        break;
    default:
        prefix = "";
        break;
    }
 
    /* Connect confunc strings to the ones as defined in "menu hud_nohud". */
    UI_ExecuteConfunc("%s%s", prefix, shootTypeStrings[button]);
    buttonStates[button] = state;
}

static int HUD_UsableReactionTUs (const le_t* le)
{
    /* Get the amount of usable TUs depending on the state (i.e. is RF on or off?) */
    if (le->state & STATE_REACTION)
        /* CL_ActorUsableTUs DOES NOT return the stored value for "reaction" here. */
        return CL_ActorUsableTUs(le) + CL_ActorReservedTUs(le, RES_REACTION);
 
    /* CL_ActorUsableTUs DOES return the stored value for "reaction" here. */
    return CL_ActorUsableTUs(le);
}

static bool HUD_CheckFiremodeReservation (void)
{
    if (!selActor)
        return false;
 
    actorHands_t hand;
    foreachhand(hand) {
        /* Get weapon (and its ammo) from the hand. */
        const fireDef_t* fireDef = HUD_GetFireDefinitionForHand(selActor, hand);
        if (!fireDef)
            continue;
 
        const objDef_t* ammo = fireDef->obj;
        for (int i = 0; i < ammo->numFiredefs[fireDef->weapFdsIdx]; i++) {
            /* Check if at least one firemode is available for reservation. */
            if (CL_ActorUsableTUs(selActor) + CL_ActorReservedTUs(selActor, RES_SHOT) >= CL_ActorTimeForFireDef(selActor, &ammo->fd[fireDef->weapFdsIdx][i]))
                return true;
        }
    }
 
    /* No reservation possible */
    return false;
}
 

static void HUD_SetShootReservation (const le_t* le, const int tus, const actorHands_t hand, const int fireModeIndex, const objDef_t* weapon)
{
    character_t* chr = CL_ActorGetChr(le);
    assert(chr);
 
    CL_ActorReserveTUs(le, RES_SHOT, tus);
    chr->reservedTus.shotSettings.set(hand, fireModeIndex, weapon);
}
 
static linkedList_t* popupListData;
static uiNode_t* popupListNode;

static void HUD_PopupFiremodeReservation (const le_t* le, bool popupReload)
{
    /* reset the list */
    UI_ResetData(TEXT_LIST);
 
    LIST_Delete(&popupListData);
 
    /* Add list-entry for deactivation of the reservation. */
    linkedList_t* popupListText = nullptr;
    LIST_AddPointer(&popupListText, (void*)(_("[0 TU] No reservation")));
    reserveShot_t reserveShotData = {ACTOR_HAND_NOT_SET, NONE, NONE, NONE};
    LIST_Add(&popupListData, reserveShotData);
    int selectedEntry = 0;
 
    actorHands_t hand;
    foreachhand(hand) {
        const fireDef_t* fd = HUD_GetFireDefinitionForHand(le, hand);
        if (!fd)
            continue;
        character_t* chr = CL_ActorGetChr(le);
        assert(chr);
 
        const objDef_t* ammo = fd->obj;
        for (int i = 0; i < ammo->numFiredefs[fd->weapFdsIdx]; i++) {
            const fireDef_t* ammoFD = &ammo->fd[fd->weapFdsIdx][i];
            const int time = CL_ActorTimeForFireDef(le, ammoFD);
            if (CL_ActorUsableTUs(le) + CL_ActorReservedTUs(le, RES_SHOT) >= time) {
                static char text[MAX_VAR];
                /* Get firemode name and TUs. */
                Com_sprintf(text, lengthof(text), _("[%i TU] %s"), time, _(ammoFD->name));
 
                /* Store text for popup */
                LIST_AddString(&popupListText, text);
 
                /* Store Data for popup-callback. */
                reserveShotData.hand = hand;
                reserveShotData.fireModeIndex = i;
                reserveShotData.weaponIndex = ammo->weapons[fd->weapFdsIdx]->idx;
                reserveShotData.TUs = time;
                LIST_Add(&popupListData, reserveShotData);
 
                /* Remember the line that is currently selected (if any). */
                if (chr->reservedTus.shotSettings.getHand() == hand
                 && chr->reservedTus.shotSettings.getFmIdx() == i
                 && chr->reservedTus.shotSettings.getWeapon() == ammo->weapons[fd->weapFdsIdx])
                    selectedEntry = LIST_Count(popupListData) - 1;
            }
        }
    }
 
    if (LIST_Count(popupListData) > 1 || popupReload) {
        /* We have more entries than the "0 TUs" one
         * or we want to simply refresh/display the popup content (no matter how many TUs are left). */
        popupListNode = UI_PopupList(_("Shot Reservation"), _("Reserve TUs for firing/using."), popupListText, "hud_shotreserve <lineselected>");
        /* Set color for selected entry. */
        VectorSet(popupListNode->selectedColor, 0.0, 0.78, 0.0);
        popupListNode->selectedColor[3] = 1.0;
        UI_TextNodeSelectLine(popupListNode, selectedEntry);
    }
}

static void HUD_PopupFiremodeReservation_f (void)
{
    if (!selActor)
        return;
 
    /* A second parameter (the value itself will be ignored) was given.
     * This is used to reset the shot-reservation.*/
    if (Cmd_Argc() == 2) {
        HUD_SetShootReservation(selActor, 0, ACTOR_HAND_NOT_SET, -1, nullptr);
    } else {
        HUD_PopupFiremodeReservation(selActor, false);
    }
}

static void HUD_ShotReserve_f (void)
{
    if (Cmd_Argc() < 2) {
        Com_Printf("Usage: %s <popupindex>\n", Cmd_Argv(0));
        return;
    }
 
    if (!selActor)
        return;
 
    /* read and range check */
    const int selectedPopupIndex = atoi(Cmd_Argv(1));
    if (selectedPopupIndex < 0 || selectedPopupIndex >= LIST_Count(popupListData))
        return;
 
    const reserveShot_t* reserveShotData = (const reserveShot_t*)LIST_GetByIdx(popupListData, selectedPopupIndex);
    if (!reserveShotData)
        return;
 
    if (reserveShotData->weaponIndex == NONE) {
        HUD_SetShootReservation(selActor, 0, ACTOR_HAND_NOT_SET, -1, nullptr);
        return;
    }

    /* Check if we have enough TUs (again) */
    if (CL_ActorUsableTUs(selActor) + CL_ActorReservedTUs(selActor, RES_SHOT) >= reserveShotData->TUs) {
        const objDef_t* od = INVSH_GetItemByIDX(reserveShotData->weaponIndex);
        if (GAME_ItemIsUseable(od)) {
            HUD_SetShootReservation(selActor, std::max(0, reserveShotData->TUs), reserveShotData->hand, reserveShotData->fireModeIndex, od);
            if (popupListNode)
                UI_TextNodeSelectLine(popupListNode, selectedPopupIndex);
        }
    }
}

static void HUD_DisplayFiremodeEntry (const char* callback, const le_t* actor, const objDef_t* ammo, const weaponFireDefIndex_t weapFdsIdx, const actorHands_t hand, const int index)
{
    if (index >= ammo->numFiredefs[weapFdsIdx])
        return;
 
    assert(actor);
    assert(hand == ACTOR_HAND_RIGHT || hand == ACTOR_HAND_LEFT);
 
    /* We have a defined fd ... */
    const fireDef_t* fd = &ammo->fd[weapFdsIdx][index];
    const int time = CL_ActorTimeForFireDef(actor, fd);
    const int usableTusForRF = HUD_UsableReactionTUs(actor);
 
    char tuString[MAX_VAR];
    const char* tooltip;
    if (usableTusForRF > time) {
        Com_sprintf(tuString, sizeof(tuString), _("Remaining TUs: %i"), usableTusForRF - time);
        tooltip = tuString;
    } else
        tooltip = _("No remaining TUs left after shot.");
 
    /* unique identifier of the action */
    /* @todo use this id as action callback instead of hand and index (we can extend it with any other soldier action we need (open door, reload...)) */
    char id[32];
    Com_sprintf(id, sizeof(id), "fire_hand%c_i%i", ACTOR_GET_HAND_CHAR(hand), index);
 
    const bool status = time <= CL_ActorUsableTUs(actor);
    UI_ExecuteConfunc("%s firemode %s %c %i %i %i \"%s\" \"%i\" \"%i\" \"%s\"", callback, id, ACTOR_GET_HAND_CHAR(hand),
            fd->fdIdx, fd->reaction, status, _(fd->name), time, fd->ammo, tooltip);
 
    /* Display checkbox for reaction firemode */
    if (fd->reaction) {
        character_t* chr = CL_ActorGetChr(actor);
        const bool active = THIS_FIREMODE(&chr->RFmode, hand, fd->fdIdx);
        /* Change the state of the checkbox. */
        UI_ExecuteConfunc("%s reaction %s %c %i", callback, id, ACTOR_GET_HAND_CHAR(hand), active);
    }
}

static void HUD_DisplayActions (const char* callback, const le_t* actor, actionType_t type)
{
    if (!actor)
        return;
 
    if (!cls.isOurRound()) {    
        return;
    }
 
    const ScopedCommand c(callback, "begin", "end");
 
    switch (type) {
    case FIRE_RIGHT: {
        const actorHands_t hand = ACTOR_HAND_RIGHT;
        const fireDef_t* fd = HUD_GetFireDefinitionForHand(actor, hand);
        if (fd == nullptr) {
            UI_PopWindow();
            return;
        }
 
        const objDef_t* ammo = fd->obj;
        if (!ammo) {
            Com_DPrintf(DEBUG_CLIENT, "HUD_DisplayFiremodes: no weapon or ammo found.\n");
            return;
        }
 
        for (int i = 0; i < MAX_FIREDEFS_PER_WEAPON; i++) {
            /* Display the firemode information (image + text). */
            HUD_DisplayFiremodeEntry(callback, actor, ammo, fd->weapFdsIdx, hand, i);
        }
    }
    break;
 
    case RELOAD_RIGHT: {
        Item* weapon = actor->getRightHandItem();
 
        /* Reloeadable item in hand. */
        if (weapon && weapon->def() && weapon->isReloadable()) {
            containerIndex_t container = CID_RIGHT;
            const char* actionId = "reload_handr";
            const int tus = HUD_CalcReloadTime(actor, weapon->def(), container);
            const bool noAmmo = tus == -1;
            const bool noTU = actor->TU < tus;
            UI_ExecuteConfunc("%s reload %s %c %i %i %i", callback, actionId, 'r', tus, !noAmmo, !noTU);
        }
    }
    break;
 
    case FIRE_LEFT: {
        const actorHands_t hand = ACTOR_HAND_LEFT;
        const fireDef_t* fd = HUD_GetFireDefinitionForHand(actor, hand);
        if (fd == nullptr) {
            UI_PopWindow();
            return;
        }
 
        const objDef_t* ammo = fd->obj;
        if (!ammo) {
            Com_DPrintf(DEBUG_CLIENT, "HUD_DisplayFiremodes: no weapon or ammo found.\n");
            return;
        }
 
        for (int i = 0; i < MAX_FIREDEFS_PER_WEAPON; i++) {
            /* Display the firemode information (image + text). */
            HUD_DisplayFiremodeEntry(callback, actor, ammo, fd->weapFdsIdx, hand, i);
        }
    }
    break;
 
    case RELOAD_LEFT: {
        Item* weapon = actor->getLeftHandItem();
 
        /* Reloadable item in hand. */
        if (weapon && weapon->def() && weapon->isReloadable()) {
            containerIndex_t container = CID_LEFT;
            const char* actionId = "reload_handl";
            const int tus = HUD_CalcReloadTime(actor, weapon->def(), container);
            const bool noAmmo = tus == -1;
            const bool noTU = actor->TU < tus;
            UI_ExecuteConfunc("%s reload %s %c %i %i %i", callback, actionId, 'l', tus, !noAmmo, !noTU);
        }
    }
    break;
    }
}

static void HUD_DisplayActions_f (void)
{
    if (Cmd_Argc() < 3) {
        Com_Printf("Usage: %s callback [l|r|L|R]\n", Cmd_Argv(0));
        return;
    }
 
    if (!selActor)
        return;
 
    actionType_t type;
    if (strchr(Cmd_Argv(2), 'r') != nullptr) {
        type = FIRE_RIGHT;
    } else if (strchr(Cmd_Argv(2), 'l') != nullptr) {
        type = FIRE_LEFT;
    } else if (strchr(Cmd_Argv(2), 'R') != nullptr) {
        type = RELOAD_RIGHT;
    } else if (strchr(Cmd_Argv(2), 'L') != nullptr) {
        type = RELOAD_LEFT;
    } else {
        return;
    }
 
    char callback[32];
    Q_strncpyz(callback, Cmd_Argv(1), sizeof(callback));
    HUD_DisplayActions(callback, selActor, type);
}

static void HUD_DisplayFiremodes_f (void)
{
    if (Cmd_Argc() < 3) {
        Com_Printf("Usage: %s callback [l|r]\n", Cmd_Argv(0));
        return;
    }
 
    if (!selActor)
        return;
 
    if (selActor->isMoving())
        return;
 
    const actorHands_t hand = ACTOR_GET_HAND_INDEX(Cmd_Argv(2)[0]);
    const actionType_t type = hand == ACTOR_HAND_RIGHT ? FIRE_RIGHT : FIRE_LEFT;
    char callback[32];
    Q_strncpyz(callback, Cmd_Argv(1), sizeof(callback));
    HUD_DisplayActions(callback, selActor, type);
}

static void HUD_UpdateReactionFiremodes (const le_t* actor, const actorHands_t hand, fireDefIndex_t firemodeActive)
{
    assert(actor);
 
    const fireDef_t* fd = HUD_GetFireDefinitionForHand(actor, hand);
    if (fd == nullptr)
        return;
 
    const objDef_t* ammo = fd->obj;
    const objDef_t* od = ammo->weapons[fd->weapFdsIdx];
 
    if (!GAME_ItemIsUseable(od))
        return;
 
    MSG_Write_PA(PA_REACT_SELECT, actor->entnum, hand, firemodeActive, od ? od->idx : NONE);
}

static void HUD_SelectReactionFiremode_f (void)
{
    if (Cmd_Argc() < 3) { /* no argument given */
        Com_Printf("Usage: %s [l|r] <num>   num=firemode number\n", Cmd_Argv(0));
        return;
    }
 
    if (!selActor)
        return;
 
    const fireDefIndex_t firemode = atoi(Cmd_Argv(2));
    if (firemode >= MAX_FIREDEFS_PER_WEAPON || firemode < 0) {
        Com_Printf("HUD_SelectReactionFiremode_f: Firemode out of bounds (%i).\n", firemode);
        return;
    }
 
    const actorHands_t hand = ACTOR_GET_HAND_INDEX(Cmd_Argv(1)[0]);
    HUD_UpdateReactionFiremodes(selActor, hand, firemode);
}

static void HUD_RemainingTUs_f (void)
{
    if (Cmd_Argc() < 3) {
        Com_Printf("Usage: %s <type> <popupindex>\n", Cmd_Argv(0));
        return;
    }
 
    const char* type = Cmd_Argv(1);
    const bool state = Com_ParseBoolean(Cmd_Argv(2));
 
    OBJZERO(displayRemainingTus);
 
    if (Q_streq(type, "reload_r")) {
        displayRemainingTus[REMAINING_TU_RELOAD_RIGHT] = state;
    } else if (Q_streq(type, "reload_l")) {
        displayRemainingTus[REMAINING_TU_RELOAD_LEFT] = state;
    } else if (Q_streq(type, "crouch")) {
        displayRemainingTus[REMAINING_TU_CROUCH] = state;
    }
}

static int HUD_GetMinimumTUsForUsage (const Item* item)
{
    assert(item->def());
 
    const fireDef_t* fd = item->getFastestFireDef();
 
    return fd ? fd->time : 900;
}

static int HUD_WeaponCanBeReloaded (const le_t* le, containerIndex_t containerID, const char** reason)
{
    const Item* invList = le->inv.getContainer2(containerID);
 
    /* No weapon in hand. */
    if (!invList) {
        *reason = _("No weapon.");
        return -1;
    }
 
    const objDef_t* weapon = invList->def();
    assert(weapon);
 
    /* This weapon cannot be reloaded. */
    if (!weapon->isReloadable()) {
        *reason = _("Weapon cannot be reloaded.");
        return -1;
    }
 
    /* Weapon is fully loaded. */
    if (invList->ammoDef() && weapon->ammo == invList->getAmmoLeft()) {
        *reason = _("No reload possible, already fully loaded.");
        return -1;
    }
 
    /* Weapon is empty or not fully loaded, find ammo of any type loadable to this weapon. */
    if (!invList->ammoDef() || weapon->ammo > invList->getAmmoLeft()) {
        const int tuCosts = HUD_CalcReloadTime(le, weapon, containerID);
        if (tuCosts >= 0) {
            const int tu = CL_ActorUsableTUs(le);
            if (tu >= tuCosts)
                return tuCosts;
            *reason = _("Not enough TUs for reloading weapon.");
        } else {
            /* Found no ammo which could be used for this weapon. */
            *reason = _("No reload possible, you don't have backup ammo.");
        }
    }
 
    return -1;
}

static bool HUD_DisplayImpossibleReaction (const le_t* actor)
{
    if (!actor)
        return false;
 
    /* Given actor does not equal the currently selected actor. */
    if (!LE_IsSelected(actor))
        return false;
 
    if (buttonStates[BT_REACTION] == BT_STATE_UNINITIALZED)
        return false;
 
    /* Display 'impossible" (red) reaction buttons */
    if (actor->state & STATE_REACTION) {
        Com_Printf("HUD_DisplayImpossibleReaction: Warning! Reaction fire enabled but no suitable weapon found!\n");
        UI_ExecuteConfunc("startreaction_impos");
        buttonStates[BT_REACTION] = BT_STATE_UNINITIALZED;
        return false;
    }
 
    return true;
}

static void HUD_DisplayPossibleReaction (const le_t* actor)
{
    if (!actor)
        return;
    /* Given actor does not equal the currently selected actor. This normally only happens on game-start. */
    if (!LE_IsSelected(actor))
        return;
 
    if (buttonStates[BT_REACTION] == BT_STATE_SELECT)
        return;
 
    /* Display 'usable" (blue) reaction buttons */
    if (actor->state & STATE_REACTION) {
        UI_ExecuteConfunc("startreaction");
        buttonStates[BT_REACTION] = BT_STATE_SELECT;
    }
}

int HUD_ReactionFireGetTUs (const le_t* actor)
{
    if (!actor)
        return -1;
 
    const FiremodeSettings& fmSetting = CL_ActorGetChr(actor)->RFmode;
    const Item* weapon = actor->getHandItem(fmSetting.getHand());
 
    if (!weapon)
        weapon = actor->getRightHandItem();
    if (!weapon)
        weapon = actor->getLeftHandItem();
 
    if (weapon && weapon->ammoDef() && weapon->isWeapon()) {
        const fireDef_t* fdArray = weapon->getFiredefs();
        if (fdArray == nullptr)
            return -1;
 
        const fireDefIndex_t fmIdx = fmSetting.getFmIdx();
        if (fmIdx >= 0 && fmIdx < MAX_FIREDEFS_PER_WEAPON) {
            return CL_ActorTimeForFireDef(actor, &fdArray[fmIdx], true);
        }
    }
 
    return -1;
}

static void HUD_UpdateButtons (const le_t* le)
{
    if (!le)
        return;
 
    const int time = CL_ActorUsableTUs(le);
    /* Crouch/stand button. */
    if (LE_IsCrouched(le)) {
        buttonStates[BT_STAND] =  BT_STATE_UNINITIALZED;
        if (time + CL_ActorReservedTUs(le, RES_CROUCH) < TU_CROUCH) {
            Cvar_Set("mn_crouchstand_tt", _("Not enough TUs for standing up."));
            HUD_SetWeaponButton(BT_CROUCH, BT_STATE_DISABLE);
        } else {
            Cvar_Set("mn_crouchstand_tt", _("Stand up (%i TU)"), TU_CROUCH);
            HUD_SetWeaponButton(BT_CROUCH, BT_STATE_DESELECT);
        }
    } else {
        buttonStates[BT_CROUCH] =  BT_STATE_UNINITIALZED;
        if (time + CL_ActorReservedTUs(le, RES_CROUCH) < TU_CROUCH) {
            Cvar_Set("mn_crouchstand_tt", _("Not enough TUs for crouching."));
            HUD_SetWeaponButton(BT_STAND, BT_STATE_DISABLE);
        } else {
            Cvar_Set("mn_crouchstand_tt", _("Crouch (%i TU)"), TU_CROUCH);
            HUD_SetWeaponButton(BT_STAND, BT_STATE_DESELECT);
        }
    }
 
    /* Crouch/stand reservation checkbox. */
    if (CL_ActorReservedTUs(le, RES_CROUCH) >= TU_CROUCH) {
        if (crouchReserveButtonState != BUTTON_TURESERVE_CROUCH_RESERVED) {
            UI_ExecuteConfunc("crouch_checkbox_check");
            Cvar_Set("mn_crouch_reservation_tt", _("%i TUs reserved for crouching/standing up.\nClick to clear."),
                    CL_ActorReservedTUs(le, RES_CROUCH));
            crouchReserveButtonState = BUTTON_TURESERVE_CROUCH_RESERVED;
        }
    } else if (time >= TU_CROUCH) {
        if (crouchReserveButtonState != BUTTON_TURESERVE_CROUCH_CLEAR) {
            UI_ExecuteConfunc("crouch_checkbox_clear");
            Cvar_Set("mn_crouch_reservation_tt", _("Reserve %i TUs for crouching/standing up."), TU_CROUCH);
            crouchReserveButtonState = BUTTON_TURESERVE_CROUCH_CLEAR;
        }
    } else {
        if (crouchReserveButtonState != BUTTON_TURESERVE_CROUCH_DISABLED) {
            UI_ExecuteConfunc("crouch_checkbox_disable");
            Cvar_Set("mn_crouch_reservation_tt", _("Not enough TUs left to reserve for crouching/standing up."));
            crouchReserveButtonState = BUTTON_TURESERVE_CROUCH_DISABLED;
        }
    }
 
    /* Shot reservation button. mn_shot_reservation_tt is the tooltip text */
    if (CL_ActorReservedTUs(le, RES_SHOT)) {
        if (shotReserveButtonState != BUTTON_TURESERVE_SHOT_RESERVED) {
            UI_ExecuteConfunc("reserve_shot_check");
            Cvar_Set("mn_shot_reservation_tt", _("%i TUs reserved for shooting.\nClick to change.\nRight-Click to clear."),
                    CL_ActorReservedTUs(le, RES_SHOT));
            shotReserveButtonState = BUTTON_TURESERVE_SHOT_RESERVED;
        }
    } else if (HUD_CheckFiremodeReservation()) {
        if (shotReserveButtonState != BUTTON_TURESERVE_SHOT_CLEAR) {
            UI_ExecuteConfunc("reserve_shot_clear");
            Cvar_Set("mn_shot_reservation_tt", _("Reserve TUs for shooting."));
            shotReserveButtonState = BUTTON_TURESERVE_SHOT_CLEAR;
        }
    } else {
        if (shotReserveButtonState != BUTTON_TURESERVE_SHOT_DISABLED) {
            UI_ExecuteConfunc("reserve_shot_disable");
            Cvar_Set("mn_shot_reservation_tt", _("Reserving TUs for shooting not possible."));
            shotReserveButtonState = BUTTON_TURESERVE_SHOT_DISABLED;
        }
    }
 
    /* reaction-fire button */
    if (!(le->state & STATE_REACTION)) {
        if (le->inv.holdsReactionFireWeapon() && time >= HUD_ReactionFireGetTUs(le))
            HUD_SetWeaponButton(BT_REACTION, BT_STATE_DESELECT);
        else
            HUD_SetWeaponButton(BT_REACTION, BT_STATE_DISABLE);
    } else {
        if (le->inv.holdsReactionFireWeapon()) {
            HUD_DisplayPossibleReaction(le);
        } else {
            HUD_DisplayImpossibleReaction(le);
        }
    }
 
    const char* reason;
 
    /* Reload buttons */
    const int rightCanBeReloaded = HUD_WeaponCanBeReloaded(le, CID_RIGHT, &reason);
    if (rightCanBeReloaded != -1) {
        HUD_SetWeaponButton(BT_RIGHT_RELOAD, BT_STATE_DESELECT);
        Cvar_Set("mn_reloadright_tt", _("Reload weapon (%i TU)."), rightCanBeReloaded);
    } else {
        Cvar_Set("mn_reloadright_tt", "%s", reason);
        HUD_SetWeaponButton(BT_RIGHT_RELOAD, BT_STATE_DISABLE);
    }
 
    const int leftCanBeReloaded = HUD_WeaponCanBeReloaded(le, CID_LEFT, &reason);
    if (leftCanBeReloaded != -1) {
        HUD_SetWeaponButton(BT_LEFT_RELOAD, BT_STATE_DESELECT);
        Cvar_Set("mn_reloadleft_tt", _("Reload weapon (%i TU)."), leftCanBeReloaded);
    } else {
        Cvar_Set("mn_reloadleft_tt", "%s", reason);
        HUD_SetWeaponButton(BT_LEFT_RELOAD, BT_STATE_DISABLE);
    }
 
    const float shootingPenalty = CL_ActorInjuryModifier(le, MODIFIER_SHOOTING);
    /* Headgear button */
    const Item* headgear = le->inv.getHeadgear();
    if (headgear) {
        const int minheadgeartime = HUD_GetMinimumTUsForUsage(headgear) * shootingPenalty;
        if (time < minheadgeartime)
            HUD_SetWeaponButton(BT_HEADGEAR, BT_STATE_DISABLE);
        else
            HUD_SetWeaponButton(BT_HEADGEAR, BT_STATE_DESELECT);
    } else {
        HUD_SetWeaponButton(BT_HEADGEAR, BT_STATE_DISABLE);
    }
 
    /* Weapon firing buttons. */
    const Item* weaponR = le->getRightHandItem();
    if (weaponR) {
        const int minweaponrtime = HUD_GetMinimumTUsForUsage(weaponR) * shootingPenalty;
        if (time < minweaponrtime)
            HUD_SetWeaponButton(BT_RIGHT_FIRE, BT_STATE_DISABLE);
        else
            HUD_SetWeaponButton(BT_RIGHT_FIRE, BT_STATE_DESELECT);
    } else {
        HUD_SetWeaponButton(BT_RIGHT_FIRE, BT_STATE_DISABLE);
    }
 
    const Item* weaponL = nullptr;
    /* check for two-handed weapon - if not, also define weaponL */
    if (!weaponR || !weaponR->isHeldTwoHanded())
        weaponL = le->getLeftHandItem();
    if (weaponL) {
        const int minweaponltime = HUD_GetMinimumTUsForUsage(weaponL) * shootingPenalty;
        if (time < minweaponltime)
            HUD_SetWeaponButton(BT_LEFT_FIRE, BT_STATE_DISABLE);
        else
            HUD_SetWeaponButton(BT_LEFT_FIRE, BT_STATE_DESELECT);
    } else {
        HUD_SetWeaponButton(BT_LEFT_FIRE, BT_STATE_DISABLE);
    }
 
    /* Check if the firemode reservation popup is shown and refresh its content. (i.e. close&open it) */
    {
        const char* menuName = UI_GetActiveWindowName();
        if (menuName[0] != '\0' && strstr(UI_GetActiveWindowName(), POPUPLIST_NODE_NAME)) {
            /* Update firemode reservation popup. */
            HUD_PopupFiremodeReservation(le, true);
        }
    }
}

static void HUD_DrawMouseCursorText (int xOffset, int yOffset, int textId)
{
    const char* string = UI_GetText(textId);
    if (string && cl_show_cursor_tooltips->integer)
        UI_DrawTooltip(string, mousePosX + xOffset, mousePosY - yOffset, viddef.virtualWidth - mousePosX);
}

void HUD_UpdateCursor (void)
{
    /* Offset of the first icon on the x-axis. */
    const int iconOffsetX = 16;
    le_t* le = selActor;
    if (le) {
        /* Offset of the first icon on the y-axis. */
        int iconOffsetY = 16;
        /* the space between different icons. */
        const int iconSpacing = 2;
        image_t* image;
        /* icon width */
        const int iconW = 16;
        /* icon height. */
        const int iconH = 16;
        int width = 0;
        int bgX = mousePosX + iconOffsetX / 2 - 2;
 
        /* checks if icons should be drawn */
        if (!(LE_IsCrouched(le) || (le->state & STATE_REACTION)))
            /* make place holder for icons */
            bgX += iconW + 4;
 
        /* if exists gets width of player name */
        if (UI_GetText(TEXT_MOUSECURSOR_PLAYERNAMES))
            R_FontTextSize("f_verysmall", UI_GetText(TEXT_MOUSECURSOR_PLAYERNAMES), viddef.virtualWidth - bgX, LONGLINES_WRAP, &width, nullptr, nullptr, nullptr);
 
        /* gets width of background */
        if (width == 0 && UI_GetText(TEXT_MOUSECURSOR_RIGHT)) {
            R_FontTextSize("f_verysmall", UI_GetText(TEXT_MOUSECURSOR_RIGHT), viddef.virtualWidth - bgX, LONGLINES_WRAP, &width, nullptr, nullptr, nullptr);
        }
 
        /* Display 'crouch' icon if actor is crouched. */
        if (LE_IsCrouched(le)) {
            image = R_FindImage("pics/cursors/ducked", it_pic);
            if (image)
                R_DrawImage(mousePosX - image->width / 2 + iconOffsetX, mousePosY - image->height / 2 + iconOffsetY, image);
        }
 
        /* Height of 'crouched' icon. */
        iconOffsetY += iconH;
        iconOffsetY += iconSpacing;
 
        /* Display 'Reaction shot' icon if actor has it activated. */
        if (le->state & STATE_REACTION)
            image = R_FindImage("pics/cursors/reactionfire", it_pic);
        else
            image = nullptr;
 
        if (image)
            R_DrawImage(mousePosX - image->width / 2 + iconOffsetX, mousePosY - image->height / 2 + iconOffsetY, image);
 
        /* Height of 'reaction fire' icon. ... in case we add further icons below.
        iconOffsetY += iconH;
        iconOffsetY += iconSpacing;
        */
 
        /* Display weaponmode (text) heR_ */
        HUD_DrawMouseCursorText(iconOffsetX + iconW, -10, TEXT_MOUSECURSOR_RIGHT);
    }
 
    /* playernames */
    HUD_DrawMouseCursorText(iconOffsetX + 16, -26, TEXT_MOUSECURSOR_PLAYERNAMES);
    UI_ResetData(TEXT_MOUSECURSOR_PLAYERNAMES);
 
    if (cl_map_debug->integer & MAPDEBUG_TEXT) {
        /* Display ceiling text */
        HUD_DrawMouseCursorText(0, -64, TEXT_MOUSECURSOR_TOP);
        /* Display floor text */
        HUD_DrawMouseCursorText(0, 64, TEXT_MOUSECURSOR_BOTTOM);
        /* Display left text */
        HUD_DrawMouseCursorText(-64, 0, TEXT_MOUSECURSOR_LEFT);
    }
}

static void HUD_MapDebugCursor (const le_t* le)
{
    if (!(cl_map_debug->integer & MAPDEBUG_TEXT))
        return;
 
    /* Display the floor and ceiling values for the current cell. */
    static char topText[UI_MAX_SMALLTEXTLEN];
    Com_sprintf(topText, lengthof(topText), "%u-(%i,%i,%i)\n",
            Grid_Ceiling(cl.mapData->routing, ACTOR_GET_FIELDSIZE(le), truePos), truePos[0], truePos[1], truePos[2]);
    /* Save the text for later display next to the cursor. */
    UI_RegisterText(TEXT_MOUSECURSOR_TOP, topText);
 
    /* Display the floor and ceiling values for the current cell. */
    static char bottomText[UI_MAX_SMALLTEXTLEN];
    Com_sprintf(bottomText, lengthof(bottomText), "%i-(%i,%i,%i)\n",
            Grid_Floor(cl.mapData->routing, ACTOR_GET_FIELDSIZE(le), truePos), mousePos[0], mousePos[1], mousePos[2]);
    /* Save the text for later display next to the cursor. */
    UI_RegisterText(TEXT_MOUSECURSOR_BOTTOM, bottomText);
 
    /* Display the floor and ceiling values for the current cell. */
    const int dvec = Grid_MoveNext(&cl.pathMap, mousePos, 0);
    static char leftText[UI_MAX_SMALLTEXTLEN];
    Com_sprintf(leftText, lengthof(leftText), "%i-%i\n", getDVdir(dvec), getDVz(dvec));
    /* Save the text for later display next to the cursor. */
    UI_RegisterText(TEXT_MOUSECURSOR_LEFT, leftText);
}

static int HUD_UpdateActorFireMode (le_t* actor)
{
    const Item* selWeapon;
 
    /* get weapon */
    if (IS_MODE_FIRE_HEADGEAR(actor->actorMode)) {
        selWeapon = actor->inv.getHeadgear();
    } else if (IS_MODE_FIRE_LEFT(actor->actorMode)) {
        selWeapon = HUD_GetLeftHandWeapon(actor, nullptr);
    } else {
        selWeapon = actor->getRightHandItem();
    }
 
    UI_ResetData(TEXT_MOUSECURSOR_RIGHT);
 
    if (!selWeapon) {
        CL_ActorSetMode(actor, M_MOVE);
        return 0;
    }
 
    static char infoText[UI_MAX_SMALLTEXTLEN];
    int time = 0;
    const objDef_t* def = selWeapon->def();
    if (!def) {
        /* No valid weapon in the hand. */
        CL_ActorSetFireDef(actor, nullptr);
    } else {
        /* Check whether this item uses/has ammo. */
        if (!selWeapon->ammoDef()) {
            const fireDef_t* old = nullptr;
            /* This item does not use ammo, check for existing firedefs in this item. */
            /* This is supposed to be a weapon or other usable item. */
            if (def->numWeapons > 0) {
                if (selWeapon->isWeapon() || def->weapons[0] == def) {
                    const fireDef_t* fdArray = selWeapon->getFiredefs();
                    if (fdArray != nullptr) {
                        /* Get firedef from the weapon (or other usable item) entry instead. */
                        old = FIRESH_GetFiredef(def, fdArray->weapFdsIdx, actor->currentSelectedFiremode);
                    }
                }
            }
            CL_ActorSetFireDef(actor, old);
        } else {
            const fireDef_t* fdArray = selWeapon->getFiredefs();
            if (fdArray != nullptr) {
                const fireDef_t* old = FIRESH_GetFiredef(selWeapon->ammoDef(), fdArray->weapFdsIdx, actor->currentSelectedFiremode);
                /* reset the align if we switched the firemode */
                CL_ActorSetFireDef(actor, old);
            }
        }
    }
 
    if (!GAME_ItemIsUseable(def)) {
        HUD_DisplayMessage(_("You cannot use this unknown item.\nYou need to research it first."));
        CL_ActorSetMode(actor, M_MOVE);
    } else if (actor->fd) {
        const int hitProbability = CL_GetHitProbability(actor);
        static char mouseText[UI_MAX_SMALLTEXTLEN];
 
        Com_sprintf(infoText, lengthof(infoText),
                    "%s\n%s (%i) [%i%%] %i\n", _(def->name), _(actor->fd->name),
                    actor->fd->ammo, hitProbability, CL_ActorTimeForFireDef(actor, actor->fd));
 
        /* Save the text for later display next to the cursor. */
        Q_strncpyz(mouseText, infoText, lengthof(mouseText));
        UI_RegisterText(TEXT_MOUSECURSOR_RIGHT, mouseText);
 
        time = CL_ActorTimeForFireDef(actor, actor->fd);
        /* if no TUs left for this firing action
         * or if the weapon is reloadable and out of ammo,
         * then change to move mode */
        if (selWeapon->mustReload() || CL_ActorUsableTUs(actor) < time)
            CL_ActorSetMode(actor, M_MOVE);
    } else if (selWeapon) {
        Com_sprintf(infoText, lengthof(infoText), _("%s\n(empty)\n"), _(def->name));
    }
 
    UI_RegisterText(TEXT_STANDARD, infoText);
    return time;
}

static int HUD_UpdateActorMove (const le_t* actor)
{
    const int reservedTUs = CL_ActorReservedTUs(actor, RES_ALL_ACTIVE);
    static char infoText[UI_MAX_SMALLTEXTLEN];
    if (actor->actorMoveLength == ROUTING_NOT_REACHABLE) {
        UI_ResetData(TEXT_MOUSECURSOR_RIGHT);
        if (reservedTUs > 0)
            Com_sprintf(infoText, lengthof(infoText), _("Morale  %i | Reserved TUs: %i\n"), actor->morale, reservedTUs);
        else
            Com_sprintf(infoText, lengthof(infoText), _("Morale  %i"), actor->morale);
    } else {
        static char mouseText[UI_MAX_SMALLTEXTLEN];
        const int moveMode = CL_ActorMoveMode(actor);
        if (reservedTUs > 0)
            Com_sprintf(infoText, lengthof(infoText), _("Morale  %i | Reserved TUs: %i\n%s %i (%i|%i TUs left)\n"),
                actor->morale, reservedTUs, _(moveModeDescriptions[moveMode]), actor->actorMoveLength,
                actor->TU - actor->actorMoveLength, actor->TU - reservedTUs - actor->actorMoveLength);
        else
            Com_sprintf(infoText, lengthof(infoText), _("Morale  %i\n%s %i (%i TUs left)\n"), actor->morale,
                _(moveModeDescriptions[moveMode]), actor->actorMoveLength, actor->TU - actor->actorMoveLength);
 
        if (actor->actorMoveLength <= CL_ActorUsableTUs(actor))
            Com_sprintf(mouseText, lengthof(mouseText), "%i (%i)\n", actor->actorMoveLength, CL_ActorUsableTUs(actor));
        else
            Com_sprintf(mouseText, lengthof(mouseText), "- (-)\n");
 
        UI_RegisterText(TEXT_MOUSECURSOR_RIGHT, mouseText);
    }
 
    UI_RegisterText(TEXT_STANDARD, infoText);
 
    return actor->actorMoveLength;
}
 
static void HUD_UpdateActorCvar (const le_t* actor)
{
    Cvar_SetValue("mn_hp", actor->HP);
    Cvar_SetValue("mn_hpmax", actor->maxHP);
    Cvar_SetValue("mn_tu", actor->TU);
    Cvar_SetValue("mn_tumax", actor->maxTU);
    Cvar_SetValue("mn_tureserved", CL_ActorReservedTUs(actor, RES_ALL_ACTIVE));
    Cvar_SetValue("mn_morale", actor->morale);
    Cvar_SetValue("mn_moralemax", actor->maxMorale);
    Cvar_SetValue("mn_stun", actor->STUN);
 
    Cvar_Set("mn_tu_tooltips", _("Time Units\n- Available: %i (of %i)\n- Reserved:  %i\n- Remaining: %i\n"),
            actor->TU, actor->maxTU, CL_ActorReservedTUs(actor, RES_ALL_ACTIVE), CL_ActorUsableTUs(actor));
 
    /* animation and weapons */
    const char* animName = R_AnimGetName(&actor->as, actor->model1);
    if (animName)
        Cvar_Set("mn_anim", "%s", animName);
    if (actor->getRightHandItem()) {
        const Item* item = actor->getRightHandItem();
        Cvar_Set("mn_rweapon", "%s", item->def()->model);
        Cvar_Set("mn_rweapon_item", "%s", item->def()->id);
    } else {
        Cvar_Set("mn_rweapon", "%s", "");
        Cvar_Set("mn_rweapon_item", "%s", "");
    }
    if (actor->getLeftHandItem()) {
        const Item* item = actor->getLeftHandItem();
        Cvar_Set("mn_lweapon", "%s", item->def()->model);
        Cvar_Set("mn_lweapon_item", "%s", item->def()->id);
    } else {
        Cvar_Set("mn_lweapon", "%s", "");
        Cvar_Set("mn_lweapon_item", "%s", "");
    }
 
    /* print ammo */
    const Item* itemRight = actor->getRightHandItem();
    if (itemRight)
        Cvar_SetValue("mn_ammoright", itemRight->getAmmoLeft());
    else
        Cvar_Set("mn_ammoright", "%s", "");
 
    const Item* itemLeft = HUD_GetLeftHandWeapon(actor, nullptr);
    if (itemLeft)
        Cvar_SetValue("mn_ammoleft", itemLeft->getAmmoLeft());
    else
        Cvar_Set("mn_ammoleft", "%s", "");
}
 
static const char* HUD_GetPenaltyString (const int type)
{
    switch (type) {
    case MODIFIER_ACCURACY:
        return _("- Reduced accuracy");
    case MODIFIER_SHOOTING:
        return _("- Reduced shooting speed");
    case MODIFIER_MOVEMENT:
        return _("- Reduced movement speed");
    case MODIFIER_SIGHT:
        return _("- Reduced sight range");
    case MODIFIER_REACTION:
        return _("- Reduced reaction speed");
    case MODIFIER_TU:
        return _("- Reduced TUs");
    default:
        return "";
    }
}
 
static void HUD_ActorWoundData_f (void)
{
    if (!CL_BattlescapeRunning())
        return;
 
    /* check if actor exists */
    if (!selActor)
        return;
 
    woundInfo_t* wounds = &selActor->wounds;
    const BodyData* bodyData = selActor->teamDef->bodyTemplate;
 
    for (int bodyPart = 0; bodyPart < bodyData->numBodyParts(); ++bodyPart) {
        const int woundThreshold = selActor->maxHP * bodyData->woundThreshold(bodyPart);
 
        if (wounds->woundLevel[bodyPart] + wounds->treatmentLevel[bodyPart] * 0.5 > woundThreshold) {
            const int bleeding = wounds->woundLevel[bodyPart] * (wounds->woundLevel[bodyPart] > woundThreshold
                                 ? bodyData->bleedingFactor(bodyPart) : 0);
            char text[256];
            const char* label;
 
            const bool isRobot = CHRSH_IsTeamDefRobot(selActor->teamDef);
            if (bleeding)
                label = va(isRobot ? _("%s: deteriorating (%i)\n") : _("%s: bleeding (%i)\n"), _(bodyData->name(bodyPart)), bleeding);
            else
                label = va(bleeding ? _("%s: damaged\n") : _("%s: wounded\n"), _(bodyData->name(bodyPart)));
 
            Q_strncpyz(text, label, sizeof(text));
            if (bleeding)
                Q_strcat(text, lengthof(text), _("- HP loss per turn: %i\n"), bleeding);
            for (int penalty = MODIFIER_ACCURACY; penalty < MODIFIER_MAX; penalty++)
                if (bodyData->penalty(bodyPart, static_cast<modifier_types_t>(penalty)) != 0)
                    Q_strcat(text, lengthof(text), "%s\n", HUD_GetPenaltyString(penalty));
 
            UI_ExecuteConfunc("actor_wounds %s %i \"%s\" \"%s\"", bodyData->id(bodyPart), bleeding, label, text);
        }
    }
}

static void HUD_UpdateActorLoad_f (void)
{
    if (!CL_BattlescapeRunning())
        return;
 
    /* check if actor exists */
    if (!selActor)
        return;
 
    const character_t* chr = CL_ActorGetChr(selActor);
    const int invWeight = selActor->inv.getWeight();
    const int maxWeight = GAME_GetChrMaxLoad(chr);
    const float penalty = GET_ENCUMBRANCE_PENALTY(invWeight, maxWeight);
    const int normalTU = GET_TU(chr->score.skills[ABILITY_SPEED], 1.0f - WEIGHT_NORMAL_PENALTY);
    const int tus = GET_TU(chr->score.skills[ABILITY_SPEED], penalty);
    const int tuPenalty = tus - normalTU;
    int count = 0;
 
    const Container* cont = nullptr;
    while ((cont = chr->inv.getNextCont(cont))) {
        Item* item = nullptr;
        while ((item = cont->getNextItem(item))) {
            const fireDef_t* fireDef = item->getFiredefs();
            if (fireDef == nullptr)
                continue;
            for (int i = 0; i < MAX_FIREDEFS_PER_WEAPON; i++) {
                const fireDef_t& fd = fireDef[i];
                if (fd.time > 0 && fd.time > tus) {
                    if (count <= 0)
                        Com_sprintf(popupText, sizeof(popupText), _("This soldier no longer has enough TUs to use the following items:\n\n"));
                    Q_strcat(popupText, sizeof(popupText), "%s: %s (%i)\n", _(item->def()->name), _(fd.name), fd.time);
                    ++count;
                }
            }
        }
    }
 
    if (count > 0)
        UI_Popup(_("Warning"), popupText);
 
    char label[MAX_VAR];
    char tooltip[MAX_VAR];
    Com_sprintf(label, sizeof(label), "%g/%i %s", invWeight / WEIGHT_FACTOR, maxWeight, _("Kg"));
    Com_sprintf(tooltip, sizeof(tooltip), "%s %i (%+i)", _("TU:"), tus, tuPenalty);
    UI_ExecuteConfunc("inv_actorload \"%s\" \"%s\" %f %i", label, tooltip, WEIGHT_NORMAL_PENALTY - (1.0f - penalty), count);
}

static void HUD_UpdateActor (le_t* actor)
{
    HUD_UpdateActorCvar(actor);
    /* write info */
    int time = 0;
 
    /* handle actor in a panic */
    if (LE_IsPanicked(actor)) {
        UI_RegisterText(TEXT_STANDARD, _("Currently panics!\n"));
    } else if (displayRemainingTus[REMAINING_TU_CROUCH]) {
        if (CL_ActorUsableTUs(actor) >= TU_CROUCH)
            time = TU_CROUCH;
    } else if (displayRemainingTus[REMAINING_TU_RELOAD_RIGHT]
     || displayRemainingTus[REMAINING_TU_RELOAD_LEFT]) {
        const Item* item;
        containerIndex_t container;
 
        if (displayRemainingTus[REMAINING_TU_RELOAD_RIGHT] && actor->getRightHandItem()) {
            container = CID_RIGHT;
            item = actor->getRightHandItem();
        } else if (displayRemainingTus[REMAINING_TU_RELOAD_LEFT] && actor->getLeftHandItem()) {
            container = NONE;
            item = HUD_GetLeftHandWeapon(actor, &container);
        } else {
            container = NONE;
            item = nullptr;
        }
 
        if (item && item->def() && item->ammoDef() && item->isReloadable()) {
            const int reloadtime = HUD_CalcReloadTime(actor, item->def(), container);
            if (reloadtime != -1 && reloadtime <= CL_ActorUsableTUs(actor))
                time = reloadtime;
        }
    } else if (CL_ActorFireModeActivated(actor->actorMode)) {
        time = HUD_UpdateActorFireMode(actor);
    } else {
        /* If the mouse is outside the world, and we haven't placed the cursor in pend
         * mode already */
        if (IN_GetMouseSpace() != MS_WORLD && actor->actorMode < M_PEND_MOVE)
            actor->actorMoveLength = ROUTING_NOT_REACHABLE;
        time = HUD_UpdateActorMove(actor);
    }
 
    /* Calculate remaining TUs. */
    /* We use the full count of TUs since the "reserved" bar is overlaid over this one. */
    time = std::max(0, actor->TU - time);
    Cvar_Set("mn_turemain", "%i", time);
 
    HUD_MapDebugCursor(actor);
}

void HUD_Update (void)
{
    if (cls.state != ca_active)
        return;
 
    /* worldlevel */
    if (cl_worldlevel->modified) {
        for (int i = 0; i < PATHFINDING_HEIGHT; i++) {
            int status = 0;
            if (i == cl_worldlevel->integer)
                status = 2;
            else if (i < cl.mapMaxLevel)
                status = 1;
            UI_ExecuteConfunc("updateLevelStatus %i %i", i, status);
        }
        cl_worldlevel->modified = false;
    }
 
    /* force them empty first */
    Cvar_Set("mn_anim", "stand0");
    Cvar_Set("mn_rweapon", "%s", "");
    Cvar_Set("mn_lweapon", "%s", "");
 
    if (selActor) {
        HUD_UpdateActor(selActor);
    } else if (!cl.numTeamList) {
        /* This will stop the drawing of the bars over the whole screen when we test maps. */
        Cvar_SetValue("mn_hp", 0);
        Cvar_SetValue("mn_hpmax", 100);
        Cvar_SetValue("mn_tu", 0);
        Cvar_SetValue("mn_tumax", 100);
        Cvar_SetValue("mn_tureserved", 0);
        Cvar_SetValue("mn_morale", 0);
        Cvar_SetValue("mn_moralemax", 100);
        Cvar_SetValue("mn_stun", 0);
    }
}

static void HUD_ActorSelectionChangeListener (const char* cvarName, const char* oldValue, const char* newValue, void* data)
{
    if (!CL_OnBattlescape())
        return;
 
    if (newValue[0] != '\0') {
        const int actorIdx = atoi(newValue);
        const size_t size = lengthof(cl.teamList);
        if (actorIdx >= 0 && actorIdx < size)
            UI_ExecuteConfunc("hudselect %s", newValue);
    }
}

static void HUD_RightHandChangeListener (const char* cvarName, const char* oldValue, const char* newValue, void* data)
{
    if (!CL_OnBattlescape())
        return;
 
    if (Q_streq(oldValue, newValue))
        return;
 
    HUD_UpdateButtons(selActor);
}

static void HUD_LeftHandChangeListener (const char* cvarName, const char* oldValue, const char* newValue, void* data)
{
    if (!CL_OnBattlescape())
        return;
 
    if (Q_streq(oldValue, newValue))
        return;
 
    HUD_UpdateButtons(selActor);
}

static void HUD_TUChangeListener (const char* cvarName, const char* oldValue, const char* newValue, void* data)
{
    if (!CL_OnBattlescape())
        return;
 
    if (Q_streq(oldValue, newValue))
        return;
 
    HUD_UpdateButtons(selActor);
}
 
static bool CL_CvarWorldLevel (cvar_t* cvar)
{
    const int maxLevel = cl.mapMaxLevel ? cl.mapMaxLevel - 1 : PATHFINDING_HEIGHT - 1;
    return Cvar_AssertValue(cvar, 0, maxLevel, true);
}

static bool HUD_CheckCLHud (cvar_t* cvar)
{
    const uiNode_t* window = UI_GetWindow(cvar->string);
    if (window == nullptr) {
        return false;
    }
 
    if (window->super == nullptr) {
        return false;
    }

    return Q_streq(window->super->name, "hud");
}

void HUD_InitUI (const char* optionWindowName)
{
    OBJZERO(buttonStates);
    if (!HUD_CheckCLHud(cl_hud)) {
        Cvar_Set("cl_hud", "hud_default");
    }
    UI_InitStack(cl_hud->string, optionWindowName);
 
    UI_ExecuteConfunc("hudinit");
}

static bool HUD_CvarCheckMNHud (cvar_t* cvar)
{
    if (!HUD_CheckCLHud(cl_hud)) {
        Cvar_Reset(cvar);
        return true;
    }
    return false;
}
 
void HUD_InitStartup (void)
{
    HUD_InitCallbacks();
 
    Cmd_AddCommand("hud_remainingtus", HUD_RemainingTUs_f, "Define if remaining TUs should be displayed in the TU-bar for some hovered-over button.");
    Cmd_AddCommand("hud_shotreserve", HUD_ShotReserve_f, "Reserve TUs for the selected entry in the popup.");
    Cmd_AddCommand("hud_shotreservationpopup", HUD_PopupFiremodeReservation_f, "Pop up a list of possible firemodes for reservation in the current turn.");
    Cmd_AddCommand("hud_selectreactionfiremode", HUD_SelectReactionFiremode_f, "Change/Select firemode used for reaction fire.");
    Cmd_AddCommand("hud_listfiremodes", HUD_DisplayFiremodes_f, "Display a list of firemodes for a weapon+ammo.");
    Cmd_AddCommand("hud_listactions", HUD_DisplayActions_f, "Display a list of action from the selected soldier.");
    Cmd_AddCommand("hud_updateactorwounds", HUD_ActorWoundData_f, "Update info on actor wounds.");
    Cmd_AddCommand("hud_updateactorload", HUD_UpdateActorLoad_f, "Update the HUD with the selected actor inventory load.");

    cl_hud = Cvar_Get("cl_hud", "hud_default", CVAR_ARCHIVE | CVAR_LATCH, "Current selected HUD.");
    Cvar_SetCheckFunction("cl_hud", HUD_CvarCheckMNHud);
 
    cl_worldlevel = Cvar_Get("cl_worldlevel", "0", 0, "Current worldlevel in tactical mode.");
    Cvar_SetCheckFunction("cl_worldlevel", CL_CvarWorldLevel);
    cl_worldlevel->modified = false;
 
    Cvar_Get("mn_ammoleft", "", 0, "The remaining amount of ammunition in the left hand weapon.");
    Cvar_Get("mn_lweapon", "", 0, "The left hand weapon model of the current selected actor - empty if no weapon.");
    Cvar_RegisterChangeListener("mn_ammoleft", HUD_LeftHandChangeListener);
    Cvar_RegisterChangeListener("mn_lweapon", HUD_LeftHandChangeListener);
 
    Cvar_Get("mn_ammoright", "", 0, "The remaining amount of ammunition in the right hand weapon.");
    Cvar_Get("mn_rweapon", "", 0, "The right hand weapon model of the current selected actor - empty if no weapon.");
    Cvar_RegisterChangeListener("mn_ammoright", HUD_RightHandChangeListener);
    Cvar_RegisterChangeListener("mn_rweapon", HUD_RightHandChangeListener);
 
    Cvar_Get("mn_turemain", "", 0, "Remaining TUs for the current selected actor.");
    Cvar_RegisterChangeListener("mn_turemain", HUD_TUChangeListener);
 
    Cvar_RegisterChangeListener("cl_selected", HUD_ActorSelectionChangeListener);
 
    cl_hud_message_timeout = Cvar_Get("cl_hud_message_timeout", "2000", CVAR_ARCHIVE, "Timeout for HUD messages (milliseconds).");
    cl_show_cursor_tooltips = Cvar_Get("cl_show_cursor_tooltips", "1", CVAR_ARCHIVE, "Show cursor tooltips in tactical game mode.");
}