cl_hud_callbacks.cpp

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/*
Copyright (C) 2002-2020 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_hud_callbacks.h"
#include "cl_hud.h"
#include "cl_actor.h"

Item* HUD_GetLeftHandWeapon (const le_t* actor, containerIndex_t* container)
{
    Item* item = actor->getLeftHandItem();

    if (!item) {
        item = actor->getRightHandItem();
        if (item == nullptr || !item->isHeldTwoHanded())
            item = nullptr;
        else if (container != nullptr)
            *container = CID_RIGHT;
    }

    return item;
}

const fireDef_t* HUD_GetFireDefinitionForHand (const le_t* actor, const actorHands_t hand)
{
    if (!actor)
        return nullptr;

    const Item* weapon = actor->getHandItem(hand);
    if (!weapon || !weapon->def())
        return nullptr;

    return weapon->getFiredefs();
}

static bool HUD_CheckShooting (const le_t* le, Item* weapon)
{
    if (!le)
        return false;

    /* No item in hand. */
    if (!weapon || !weapon->def()) {
        HUD_DisplayMessage(_("Can't perform action - no item in hand!"));
        return false;
    }
    /* Cannot shoot because of lack of ammo. */
    if (weapon->mustReload()) {
        HUD_DisplayMessage(_("Can't perform action - no ammo!"));
        return false;
    }
    /* Cannot shoot because weapon is fireTwoHanded, yet both hands handle items. */
    if (weapon->def()->fireTwoHanded && le->getLeftHandItem()) {
        HUD_DisplayMessage(_("Can't perform action - weapon cannot be fired one handed!"));
        return false;
    }

    return true;
}

static void HUD_FireWeapon_f (void)
{
    if (Cmd_Argc() < 3) { /* no argument given */
        Com_Printf("Usage: %s <l|r> <firemode number>\n", Cmd_Argv(0));
        return;
    }

    le_t* actor = selActor;
    if (actor == nullptr)
        return;

    const actorHands_t hand = ACTOR_GET_HAND_INDEX(Cmd_Argv(1)[0]);
    const fireDefIndex_t firemode = atoi(Cmd_Argv(2));
    if (firemode >= MAX_FIREDEFS_PER_WEAPON || firemode < 0)
        return;

    const fireDef_t* fd = HUD_GetFireDefinitionForHand(actor, hand);
    if (fd == nullptr)
        return;

    const objDef_t* ammo = fd->obj;

    /* Let's check if shooting is possible. */
    if (!HUD_CheckShooting(actor, actor->getHandItem(hand)))
        return;

    if (CL_ActorTimeForFireDef(actor, &ammo->fd[fd->weapFdsIdx][firemode]) <= CL_ActorUsableTUs(actor)) {
        /* Actually start aiming. This is done by changing the current mode of display. */
        if (hand == ACTOR_HAND_RIGHT)
            CL_ActorSetMode(actor, M_FIRE_R);
        else
            CL_ActorSetMode(actor, M_FIRE_L);
        /* Store firemode. */
        actor->currentSelectedFiremode = firemode;
    } else {
        /* Can not shoot because of not enough TUs - every other
         * case should be checked previously in this function. */
        HUD_DisplayMessage(_("Can't perform action - not enough TUs!"));
    }
}

static void HUD_SetMoveMode_f (void)
{
    le_t* actor = selActor;

    if (actor == nullptr)
        return;

    CL_ActorSetMode(actor, M_MOVE);
}

static void HUD_ToggleCrouchReservation_f (void)
{
    const le_t* actor = selActor;

    if (!CL_ActorCheckAction(actor))
        return;

    if (CL_ActorReservedTUs(actor, RES_CROUCH) >= TU_CROUCH) {
        /* Reset reserved TUs to 0 */
        CL_ActorReserveTUs(actor, RES_CROUCH, 0);
        HUD_DisplayMessage(_("Disabled crouching/standing up TUs reservation."));
    } else {
        /* Reserve the exact amount for crouching/standing up (if we have enough to do so). */
        CL_ActorReserveTUs(actor, RES_CROUCH, TU_CROUCH);
        HUD_DisplayMessage(va(_("Reserved %i TUs for crouching/standing up."), TU_CROUCH));
    }
}

static void HUD_ToggleReaction_f (void)
{
    int state = 0;
    const le_t* actor = selActor;

    if (!CL_ActorCheckAction(actor))
        return;

    if (!(actor->state & STATE_REACTION)) {
        if (actor->inv.holdsReactionFireWeapon() && CL_ActorUsableTUs(actor) >= HUD_ReactionFireGetTUs(actor)) {
            state = STATE_REACTION;
            HUD_DisplayMessage(_("Reaction fire enabled."));
        } else {
            return;
        }
    } else {
        state = ~STATE_REACTION;
        HUD_DisplayMessage(_("Reaction fire disabled."));
    }

    /* Send request to update actor's reaction state to the server. */
    MSG_Write_PA(PA_STATE, actor->entnum, state);
}

int HUD_CalcReloadTime (const le_t* le, const objDef_t* weapon, containerIndex_t toContainer)
{
    if (toContainer == NONE)
        return -1;

    assert(le);
    assert(weapon);

    Item* ic;
    const containerIndex_t container = CL_ActorGetContainerForReload(&ic, &le->inv, weapon);
    if (container == NONE)
        return -1;

    /* total TU cost is the sum of 3 numbers:
     * TU for weapon reload + TU to get ammo out + TU to put ammo in hands */
    return INVDEF(container)->out + INVDEF(toContainer)->in + weapon->getReloadTime();
}

static bool HUD_CheckReload (const le_t* le, const Item* weapon, containerIndex_t container)
{
    if (!le)
        return false;

    /* No item in hand. */
    if (!weapon || !weapon->def()) {
        HUD_DisplayMessage(_("Can't perform action - no item in hand!"));
        return false;
    }

    /* Cannot reload because this item is not reloadable. */
    if (!weapon->isReloadable()) {
        HUD_DisplayMessage(_("Can't perform action - this item is not reloadable!"));
        return false;
    }

    const int tus = HUD_CalcReloadTime(le, weapon->def(), container);
    /* Cannot reload because of no ammo in inventory. */
    if (tus == -1) {
        HUD_DisplayMessage(_("Can't perform action - no ammo!"));
        return false;
    }
    /* Cannot reload because of not enough TUs. */
    if (le->TU < tus) {
        HUD_DisplayMessage(_("Can't perform action - not enough TUs!"));
        return false;
    }

    return true;
}

static void HUD_ReloadLeft_f (void)
{
    le_t* actor = selActor;

    if (actor == nullptr)
        return;

    containerIndex_t container = CID_LEFT;
    if (!HUD_CheckReload(actor, HUD_GetLeftHandWeapon(actor, &container), container))
        return;
    CL_ActorReload(actor, container);
    HUD_DisplayMessage(_("Left hand weapon reloaded."));
}

static void HUD_ReloadRight_f (void)
{
    le_t* actor = selActor;

    if (!actor || !HUD_CheckReload(actor, actor->getRightHandItem(), CID_RIGHT))
        return;
    CL_ActorReload(actor, CID_RIGHT);
    HUD_DisplayMessage(_("Right hand weapon reloaded."));
}

static void HUD_ExecuteAction_f (void)
{
    if (!selActor)
        return;

    if (Cmd_Argc() < 2) {
        Com_Printf("Usage: %s <actionid>\n", Cmd_Argv(0));
        return;
    }

    if (Q_streq(Cmd_Argv(1), "reload_handl")) {
        HUD_ReloadLeft_f();
        return;
    }

    if (Q_streq(Cmd_Argv(1), "reload_handr")) {
        HUD_ReloadRight_f();
        return;
    }

    if (char const* const rest = Q_strstart(Cmd_Argv(1), "fire_hand")) {
        if (strlen(rest) >= 4) {
            char const hand  = rest[0];
            int  const index = atoi(rest + 3);
            Cmd_ExecuteString("hud_fireweapon %c %i", hand, index);
            return;
        }
    }

    Com_Printf("HUD_ExecuteAction_f: Action \"%s\" unknown.\n", Cmd_Argv(1));
}

void HUD_InitCallbacks (void)
{
    Cmd_AddCommand("hud_movemode", HUD_SetMoveMode_f, N_("Set selected actor to move mode (it cancels the fire mode)."));
    Cmd_AddCommand("hud_reloadleft", HUD_ReloadLeft_f, N_("Reload the weapon in the soldiers left hand."));
    Cmd_AddCommand("hud_reloadright", HUD_ReloadRight_f, N_("Reload the weapon in the soldiers right hand."));
    Cmd_AddCommand("hud_togglecrouchreserve", HUD_ToggleCrouchReservation_f, N_("Toggle reservation for crouching."));
    Cmd_AddCommand("hud_togglereaction", HUD_ToggleReaction_f, N_("Toggle reaction fire."));
    Cmd_AddCommand("hud_fireweapon", HUD_FireWeapon_f, N_("Start aiming the weapon."));
    Cmd_AddCommand("hud_executeaction", HUD_ExecuteAction_f, N_("Execute an action."));
}