#include <a_samp>

stock GetClosestVehicle(playerid, Float: fRadius) // by RyDeR`
{
    new
        iClosestID = INVALID_VEHICLE_ID,
        Float: fFinalDistance,
        Float: fDistance,
        Float: fX,
        Float: fY,
        Float: fZ;
    GetPlayerPos(playerid, fX, fY, fZ);
    fFinalDistance = fRadius;

    for(new i; i != MAX_VEHICLES; i++)
    {
        if((fDistance = GetVehicleDistanceFromPoint(i, fX, fY, fZ)) < fFinalDistance)
        {
            fFinalDistance = fDistance;
            iClosestID = i;
        }
    }
    return iClosestID;
}


public OnPlayerKeyStateChange(playerid,newkeys,oldkeys)
{
    if(newkeys & KEY_FIRE)
    {
        if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 525)
        {
            new closestVehicle = GetClosestVehicle(playerid, 10);
            if(closestVehicle == INVALID_VEHICLE_ID)
                return SendClientMessage(playerid, 0x80FF00FF, "You are not close enough to any vehicle!"), true;
            AttachTrailerToVehicle(closestVehicle, GetPlayerVehicleID(playerid));
        }
        else
            return SendClientMessage(playerid, 0x80FF00FF, "You must be in a towtruck!"), true;
    }
    return 1;
}