// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Color-channel mixing quiz
// Not compiled or tested in-world
// Setup: Owner-touch. Answer with RG, RB, or GB.
// Stop / restore: Stop responding and the listener closes after 90 seconds, or remove/disable the script. Owner-touch restarts the exercise.
// Notes: Owner-only local exercise; no prizes, visitor records, network service, or persistent scores. A simple idealized additive-light lesson, not pigment mixing or a color-management measurement.
// 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);
}
ask(string prompt)
{
    if(!handle)
    {
        channel=-1000-(integer)llFrand(1000000.0);
        handle=llListen(channel,"",llGetOwner(),"");
    }
    llTextBox(llGetOwner(),prompt,channel);
    llSetTimerEvent(90.0);
}
list names=["yellow","magenta","cyan"];
list pairs=["rg","rb","gb"];
integer choice;
start()
{
    choice=(integer)llFrand(3.0);
    ask("Which two additive RGB channels make "+llList2String(names,choice)+"? Enter RG, RB, or GB.");
}
answer(string s)
{
    s=llToLower(s);
    if(llListFindList(pairs,[s])<0)
    {
        ask("Use RG, RB, or GB.");
        return;
    }
    close();
    if(s==llList2String(pairs,choice))llOwnerSay("Correct.");
    else llOwnerSay("This pair is "+llToUpper(llList2String(pairs,choice))+".");
}
default
{
    touch_start(integer count)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        close();
        start();
    }
    listen(integer ch,string name,key id,string message)
    {
        if(!handle||ch!=channel||id!=llGetOwner())return;
        answer(llStringTrim(message,STRING_TRIM));
    }
    timer()
    {
        close();
        llOwnerSay("Exercise paused. Touch to restart.");
    }
    changed(integer change)
    {
        if(change&CHANGED_OWNER)llResetScript();
    }
}