How to rename wp-login.php to login.php and hide wp-admin

Hi everyone,
I know this question have been ask alot of time but there dont seem to have a good solid solution to this.

I am running a community website with buddypress, I wanted user to log in from the frontend. I use login widget.

I wanted to rename wp-login.php to login.php so when they visit wp-login.php redirect to 404 not found or login.php, and when user visit wp-admin, they are redirect to login.php.

I know there are plugins, that add a key behind wp-login.php or wp-admin, but user couldnt log in successfully with the login widget.

Any solutions?