// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Rule30 cellular strip
// Not compiled or tested in-world
// Setup: Enter step or1-16 to toggle a cell. Ends wrap. Owner-touch initializes; enter reset to restart. Text input closes after90seconds.
// Stop / restore: Close or ignore the text box, or remove the script. It changes no world objects, avatar state or inventory.
// Notes: Original bounded, manually stepped educational toy. Not a calibrated simulator, real-world control system, or live scientific measurement. Only the current generation is retained. This is a1D cellular rule, not random-number security.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer channel;
integer handle;
list cells;
integer generation;
close()
{
    if(handle)llListenRemove(handle);
    handle=0;
    llSetTimerEvent(0.0);
}
start()
{
    cells=[0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0];
    generation=0;
}
string view()
{
    return "Generation "+(string)generation+": "+llDumpList2String(cells,"");
}
show()
{
    llOwnerSay(view());
    if(!handle)
    {
        channel=-1000-(integer)llFrand(1000000.0);
        handle=llListen(channel,"",llGetOwner(),"");
    }
    llTextBox(llGetOwner(),"Enter step or1-16 to toggle a cell. Ends wrap. Type reset to restart.",channel);
    llSetTimerEvent(90.0);
}
default
{
    touch_start(integer n)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        close();
        start();
        show();
    }
    listen(integer incomingChannel,string name,key id,string s)
    {
        if(!handle||incomingChannel!=channel||id!=llGetOwner())return;
        s=llToLower(llStringTrim(s,STRING_TRIM));
        if(s=="reset")start();
        else
        {
            if(s=="step")
            {
                list next=[];
                integer i;
                for(i=0;i<16;++i)
                {
                    integer bits=llList2Integer(cells,(i+15)%16)*4+llList2Integer(cells,i)*2+llList2Integer(cells,(i+1)%16);
                    next+=[(30>>bits)&1];
                }
                cells=next;
                ++generation;
            }
            else
            {
                integer cell=(integer)s-1;
                if(cell>=0&&cell<16&&(string)(cell+1)==s)cells=llListReplaceList(cells,[!llList2Integer(cells,cell)],cell,cell);
            }
        }
        show();
    }
    timer()
    {
        close();
    }
}