// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Paired animation layer preview
// Not compiled or tested in-world
// Setup: Add licensed animations upper_layer and lower_layer that were designed to affect different joints. Owner-touch grants permission.
// Stop / restore: Touch while playing or wait five seconds. Stop Animating Me is the fallback after interruption.
// Notes: Stop before renaming or removing animation assets. An animation asset may also be used by another controller: do not run competing controllers for the same asset. LSL does not change animation priority or joint masks; those must be authored in the assets. This is a compatibility preview, not a universal animation blender.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer pending;
integer playing;
integer permitted()
{
    return (llGetPermissions()&PERMISSION_TRIGGER_ANIMATION)&&llGetPermissionsKey()==llGetOwner();
}
stop()
{
    if(playing&&permitted())
    {
        llStopAnimation("upper_layer");
        llStopAnimation("lower_layer");
    }
    playing=FALSE;
    llSetTimerEvent(0.0);
}
default
{
    touch_start(integer n)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(playing)
        {
            stop();
            return;
        }
        if(pending)return;
        if(llGetInventoryType("upper_layer")!=INVENTORY_ANIMATION||llGetInventoryType("lower_layer")!=INVENTORY_ANIMATION)
        {
            llOwnerSay("Add upper_layer and lower_layer animations.");
            return;
        }
        pending=TRUE;
        llRequestPermissions(llGetOwner(),PERMISSION_TRIGGER_ANIMATION);
    }
    run_time_permissions(integer p)
    {
        if(!pending)return;
        pending=FALSE;
        if(!permitted())return;
        if(llGetInventoryType("upper_layer")!=INVENTORY_ANIMATION||llGetInventoryType("lower_layer")!=INVENTORY_ANIMATION)return;
        playing=TRUE;
        llStartAnimation("upper_layer");
        llStartAnimation("lower_layer");
        llSetTimerEvent(5.0);
    }
    timer()
    {
        stop();
    }
    changed(integer change)
    {
        if(change&CHANGED_OWNER)llResetScript();
    }
}