new

#include <a_samp>
#include <math>
#include <zcmd>

#if !defined IsValidVehicle
    native IsValidVehicle(vehicleid);
#endif

new
    attach_trailer[MAX_VEHICLES] = 0,
    attach_vehicle[MAX_VEHICLES] = 0,
    attach_timer[MAX_VEHICLES] = 0
;

stock DFT30_TrailerAttach(vehicleid, trailerid)
{
    if(!IsValidVehicle(vehicleid) || GetVehicleModel(vehicleid) != 578) return 0;
    if(!IsValidVehicle(trailerid) || GetVehicleModel(trailerid) == 578) return 0;
    if(attach_trailer[vehicleid] || attach_vehicle[trailerid]) return 0;

    attach_trailer[vehicleid] = trailerid;
    attach_vehicle[trailerid] = vehicleid;
    attach_timer[vehicleid] = SetTimerEx("DFT30_UpdateTrailer", 15, true, "d", vehicleid);

    return 1;
}

stock DFT30_DetachTrailer(vehicleid)
{
    if(!attach_timer[vehicleid]) return 0;
    new trailerid = attach_trailer[vehicleid];
    KillTimer(attach_timer[vehicleid]);
    attach_trailer[vehicleid] = 0;
    attach_vehicle[trailerid] = 0;
    return 1;
}

forward DFT30_UpdateTrailer(vehicleid);
public DFT30_UpdateTrailer(vehicleid)
{
    new Float:x, Float:y, Float:z, Float:angle;
    GetVehicleZAngle(vehicleid, angle);
    GetVehiclePos(vehicleid, x, y, z);
    GetXYFromAngle(x, y, angle, -1.8);

    new trailerid = attach_trailer[vehicleid];
    SetVehiclePos(trailerid, x, y, (z + 1.2));

    GetVehicleZAngle(vehicleid, angle);
    SetVehicleZAngle(trailerid, angle);
    // Melhor usar (Get/Set)VehicleRot
    // https://github.com/Leonardo541/matrix
    return 1;
}

CMD:guinchar(playerid, params[])
{
    new
        vehicleid = GetPlayerVehicleID(playerid),
        trailerid = strval(params)
    ;

    if(!DFT30_TrailerAttach(vehicleid, trailerid))
    {
        new Float:x, Float:y, Float:z, Float:rot;
        GetVehiclePos(vehicleid, x, y, z);
        GetVehicleZAngle(vehicleid, rot);
        GetXYFromAngle(x, y, rot, 10.0);

        DFT30_DetachTrailer(vehicleid);
        SetVehicleZAngle(vehicleid, rot);
        SetVehiclePos(vehicleid, x, y, z);
    }
    return 1;
}

main() { print("SA-MP ANDROID 2021"); }