// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Water jug puzzle
// Not compiled or tested in-world
// Setup: Enter fill3, fill5, empty3, empty5, 3to5 or 5to3. Owner-touch starts a fresh game; type reset to restart. Input times out after 90 seconds.
// Stop / restore: Let the input timeout expire or remove the script. No world geometry, avatar or inventory is changed.
// Notes: Original compact educational game. Owner-only local input; no scores or avatar identities are sent to a service. Output is short ASCII text. Not a competition authority.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer channel;
integer handle;
integer a;
integer b;
close()
{
    if(handle)llListenRemove(handle);
    handle=0;
    llSetTimerEvent(0.0);
}
start()
{
    a=0;
    b=0;
}
string board()
{
    return "3L jug: "+(string)a+" | 5L jug: "+(string)b;
}
show()
{
    llOwnerSay(board());
    if(!handle)
    {
        channel=-1000-(integer)llFrand(1000000.0);
        handle=llListen(channel,"",llGetOwner(),"");
    }
    llTextBox(llGetOwner(),"Enter fill3, fill5, empty3, empty5, 3to5 or 5to3. 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 input)
    {
        if(!handle||incomingChannel!=channel||id!=llGetOwner())return;
        input=llToLower(llStringTrim(input,STRING_TRIM));
        if(input=="reset")start();
        else
        {
            if(input=="fill3")a=3;
            else if(input=="fill5")b=5;
            else if(input=="empty3")a=0;
            else if(input=="empty5")b=0;
            else if(input=="3to5")
            {
                integer amount=a;
                if(amount>5-b)amount=5-b;
                a-=amount;
                b+=amount;
            }
            else if(input=="5to3")
            {
                integer amount=b;
                if(amount>3-a)amount=3-a;
                b-=amount;
                a+=amount;
            }
            else llOwnerSay("Unknown move.");
            if(b==4)llOwnerSay("Exactly four liters!");
        }
        show();
    }
    timer()
    {
        close();
    }
}