Google apps script Script Script overwriting a document into a separate document

Good afternoon.
I'd like to solve the next problem.
The Google spreadsheet document, the script should perform the following functions.
1. Creates a folder in Google Drive with the name of the spreadsheet file
2. Creates a document in .csv format to divide ";", the first sheet of the processed document in the folder [1]
3. Restores data from the spreadshhet document to the .csv document each time the script is executed due to the time trigger.
4. Important: The csv document ID must be retained, i.e. I have to re-record.

I found a similar code on the Internet, but it processes all the sheets and when executed, creates a new document with a new folder.
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(Google Drive text document with sample code, author: Text hidden)