// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Intersection phase rehearsal
// Not compiled or tested in-world
// Setup: Enter step to advance phase or emergency for all red. Resume starts from first all-red phase. 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. Text-only safety illustration. Not suitable for controlling traffic or any real safety-critical system.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer channel;
integer handle;
integer phase;
integer emergency;
close()
{
    if(handle)llListenRemove(handle);
    handle=0;
    llSetTimerEvent(0.0);
}
start()
{
    phase=0;
    emergency=FALSE;
}
string view()
{
    if(emergency)return "ALL RED - rehearsal hold";
    return llList2String(["ALL RED","NS green / EW red","NS yellow / EW red","ALL RED","NS red / EW green","NS red / EW yellow"],phase);
}
show()
{
    llOwnerSay(view());
    if(!handle)
    {
        channel=-1000-(integer)llFrand(1000000.0);
        handle=llListen(channel,"",llGetOwner(),"");
    }
    llTextBox(llGetOwner(),"Enter step to advance phase or emergency for all red. Resume starts from first all-red phase. 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=="emergency")emergency=TRUE;
            else if(s=="resume")
            {
                emergency=FALSE;
                phase=0;
            }
            else if(s=="step"&&!emergency)phase=(phase+1)%6;
        }
        show();
    }
    timer()
    {
        close();
    }
}