auto product barcodes

Odoo Community version 10 is used
Required :
Developing Odoo module product variant default code
in Oca app store :

https://odoo-community.org/shop/product-variant-default-code-2001?search=product+variant+default+code#attr=473

which is auto generate product internal refrence ( default code )

enable it to auto generate product barcodes with Ean13 format

barcode creation by 13 digit with a specific syntax (pattern) :
-Part#1 consist of first 2 digit it should be for color value code
-Part#2 consist of second 2 digits should be for size value code
- part #3 consist of 8 digits from fourth one to twelveth it should be for refrence prefix completed by
left zerosif refrence prefix short than8 digits
- part #4 one digit for error detection for reading refrences
https://www.open.edu/openlearn/science-maths-technology/exploring-communications-technology/content-section-2.1

or


https://boxshot.com/barcode/tutorials/ean-13-calculator/
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