bash script for changing remote origin URL if -r option set as 1 or 2

origin_switcher.sh

#!/bin/sh

sgit=git@gitlab.com:user/repo.git
ggit=git@github.com:user/repo.git

while getopts r: flag
do
    case "${flag}" in
        r) remote_git=${OPTARG};;
    esac
done
case $remote_git in
    1)
        git remote set-url --push origin $sgit
        git remote set-url --add origin $sgit
        git remote set-url --delete origin $ggit
    ;;
    2)
        git remote set-url --push origin $ggit
        git remote set-url --add origin $ggit
        git remote set-url --delete origin $sgit
    ;;
esac