// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Face transparency loupe
// Not compiled or tested in-world
// Setup: Put in a spare prim. Menu lists up to nine face numbers; selecting another restores the previous face. Restore unhides the selected face.
// Stop / restore: Use the Restore or Home action described in setup before removing or resetting if you want the startup appearance. Menu listeners expire after 45 seconds.
// Notes: Local owner-only control. Saved snapshots live in script memory and are lost on reset. This is only a visual inspection tool and never changes collisions. It restores saved per-face alpha, not PBR alpha modes.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer channel;
integer handle;
close()
{
    if(handle)llListenRemove(handle);
    handle=0;
    llSetTimerEvent(0.0);
}
menu(string prompt,list buttons)
{
    if(!handle)
    {
        channel=-1000-(integer)llFrand(1000000.0);
        handle=llListen(channel,"",llGetOwner(),"");
    }
    llDialog(llGetOwner(),prompt,buttons,channel);
    llSetTimerEvent(45.0);
}
list alpha;
integer selected=-1;
init()
{
    integer i;
    for(i=0;i<llGetNumberOfSides();++i)alpha+=[llGetAlpha(i)];
}
show()
{
    list buttons=["Restore"];
    integer i;
    for(i=0;i<llGetListLength(alpha)&&i<9;++i)buttons+=[(string)i];
    menu("Hide one face for inspection",buttons);
}
choose(string s)
{
    if(s=="Restore")
    {
        if(selected>=0)llSetAlpha(llList2Float(alpha,selected),selected);
        selected=-1;
        show();
        return;
    }
    integer i=llListFindList(["0","1","2","3","4","5","6","7","8"],[s]);
    if(i<0||i>=llGetListLength(alpha))return;
    if(selected>=0)llSetAlpha(llList2Float(alpha,selected),selected);
    selected=i;
    llSetAlpha(0.0,selected);
    show();
}
default
{
    state_entry()
    {
        init();
    }
    touch_start(integer n)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        close();
        show();
    }
    listen(integer ch,string name,key id,string message)
    {
        if(!handle||ch!=channel||id!=llGetOwner())return;
        choose(message);
    }
    timer()
    {
        close();
    }
    changed(integer change)
    {
        if(change&CHANGED_OWNER)llResetScript();
    }
}