info = {
    'icon' : 'DECORATE_LIBRARY_OVERRIDE',
    'description' : 'Check available library update',
    'update' : False,
    'fullreport': False,
}

import bpy
import os
from os import listdir, scandir
from os.path import abspath, relpath, join, dirname, basename, exists, isfile, isdir, splitext
import re, fnmatch, glob
from mathutils import Vector, Matrix
from math import radians, degrees
C = bpy.context
D = bpy.data
scene = C.scene

auto_update = info['update']#False
fullreport = info['fullreport']

## 1: all execpt num, 2: num, 3:ext
rseq = re.compile('^(.*?)(\d+)(\D*)$')


print('\n--library check--')
for ob in bpy.context.scene.objects:
    if not ob.type == 'EMPTY': continue    
    if not ob.instance_collection: continue
    if not ob.instance_collection.library: continue
    lib = ob.instance_collection.library
    if not lib: continue
    fp = lib.filepath
    if not fp: continue
    rel_dir = dirname(fp)
    abs_lib = abspath(bpy.path.abspath(fp))
    if not exists(abs_lib):
        print(f'Lib not found: obj: {ob.name} > instance: {ob.instance_collection.name}\n-> {abs_lib}')
        continue
    lib_dir = dirname(abs_lib)
    lib_name = basename(abs_lib)
    
    #same length ? #last modified ? #last by name without #must be 90% identical ? # parts without rightmost number must be identical (good enough)
    regname = rseq.search(lib_name)
    if not regname:
        print(f'X - {lib_name} : could not identify version using regex: {rseq.pattern}')
        continue
    name_base = regname.group(1)
    
    # filelist = [f for f in scandir(lib_dir) if f.is_file() and len(f.name) == len(lib_name)]
    
    # more strict with filename
    filelist = [f for f in scandir(lib_dir) if f.is_file() and len(f.name) == len(lib_name) and rseq.search(f.name) and rseq.search(f.name).group(1) == name_base]        
    filelist.sort(key=lambda x : x.name)#sort in place alphabetically

    last = filelist[-1]
    if last.name != lib.name:
        print(f'/!\ Lib update found : obj: {ob.name} > instance: {ob.instance_collection.name}\n   {lib_name} >> {last.name}\n')
        
        if auto_update:
            ### use relocate or do it automagically...
            nfp = join(dirname(fp), last.name)
            lib.filepath = nfp
        continue
    
    if fullreport: print(f'Lib OK : obj: {ob.name} > instance: {ob.instance_collection.name} > file: {lib_name}')
    ## make breakdown popup for addon version