VARP(nosway, 0, 0, 1);
VARP(swayspeeddiv, 1, 105, 1000);
VARP(swaymovediv, 1, 200, 1000); 
VARP(swayupspeeddiv, 1, 105, 1000);
VARP(swayupmovediv, 1, 200, 1000); 

struct weaponmove
{
    static vec swaydir;
    static int swaymillis, lastsway;

    float k_rot, kick;
    vec pos;
    int anim;
    
	weaponmove() : k_rot(0), kick(0), anim(0) { pos.x = pos.y = pos.z = 0.0f; }

    void calcmove(vec base, int basetime)
    {
        kick = k_rot = 0.0f;
        pos = player1->o;
        anim = ANIM_GUN_IDLE;
        
        if(!nosway)
        {
            float k = pow(0.7f, (lastmillis-lastsway)/10.0f);
            swaydir.mul(k);
            vec dv(player1->vel);
            dv.mul((1-k)/max(player1->vel.magnitude(), player1->maxspeed));
            dv.x *= 1.5f;
            dv.y *= 1.5f;
            dv.z *= 0.4f;
            swaydir.add(dv);
            pos.add(swaydir);
        }

        if(player1->onfloor || player1->onladder || player1->inwater) swaymillis += lastmillis-lastsway;
        lastsway = lastmillis;

        if(player1->weaponchanging)
        {
            anim = ANIM_GUN_RELOAD;
            float progress = max(0.0f, min(1.0f, (lastmillis - player1->weaponchanging)/(float) weapon::weaponchangetime));
            k_rot = -(sinf((float)(progress*2*90.0f)*PI/180.0f)*90);
        }
        else if(player1->weaponsel->reloading)
        {
            anim = ANIM_GUN_RELOAD;
            float progress = max(0.0f, min(1.0f, (lastmillis - player1->weaponsel->reloading)/(float)player1->weaponsel->info.reloadtime));
            k_rot = -(sinf((float)(progress*2*90.0f)*PI/180.0f)*90);
        }
        else
        {
            int timediff = lastmillis-basetime, 
                animtime = min(player1->weaponsel->gunwait, (int)player1->weaponsel->info.attackdelay);
            vec sway = base;
            float progress = 0.0f;
            float k_back = 0.0f;
            
            if(player1->weaponsel==player1->lastattackweapon)
            {
                progress = max(0.0f, min(1.0f, timediff/(float)animtime));
                // f(x) = -sin(x-1.5)^3
                kick = -sinf(pow((1.5f*progress)-1.5f,3));
                if(player1->crouching) kick *= 0.75f;
                if(player1->lastaction) anim = player1->weaponsel->modelanim();
            }
            
            if(player1->weaponsel->info.mdl_kick_rot || player1->weaponsel->info.mdl_kick_back)
            {
                k_rot = player1->weaponsel->info.mdl_kick_rot*kick;
                k_back = player1->weaponsel->info.mdl_kick_back*kick/10;
            }
            
            if(nosway) sway.x = sway.y = sway.z = 0;
            else
            {
                float swayspeed = sinf((float)swaymillis/swayspeeddiv)/(swaymovediv/10.0f);
                float swayupspeed = cosf((float)swaymillis/swayupspeeddiv)/(swayupmovediv/10.0f);

                float plspeed = min(1.0f, sqrtf(player1->vel.x*player1->vel.x + player1->vel.y*player1->vel.y));
                
                swayspeed *= plspeed/2;
                swayupspeed *= plspeed/2;

                swap(sway.x, sway.y);
                sway.y = -sway.y;
                
                swayupspeed = fabs(swayupspeed); // sway a semicirle only
                sway.z = 1.0f;
                
                sway.x *= swayspeed;
                sway.y *= swayspeed;
                sway.z *= swayupspeed;

                if(player1->crouching) sway.mul(0.75f);
            }
            
            pos.x -= base.x*k_back+sway.x;
            pos.y -= base.y*k_back+sway.y;
            pos.z -= base.z*k_back+sway.z;
        }
    }
};

vec weaponmove::swaydir(0, 0, 0);
int weaponmove::lastsway = 0, weaponmove::swaymillis = 0;

void preload_hudguns()
{
    loopi(NUMGUNS)
    {
        s_sprintfd(path)("weapons/%s", guns[i].modelname);
        loadmodel(path);
    }
}