if hash chsh >/dev/null 2>&1 && [ -f ~/.shell.pre-oh-my-zsh ]; then
  old_shell=$(cat ~/.shell.pre-oh-my-zsh)
  echo "Switching your shell back to '$old_shell':"
  if chsh -s "$old_shell"; then
    rm -f ~/.shell.pre-oh-my-zsh
  else
    echo "Could not change default shell. Change it manually by running chsh"
    echo "or editing the /etc/passwd file."
    exit
  fi
fi

read -r -p "Are you sure you want to remove Oh My Zsh? [y/N] " confirmation
if [ "$confirmation" != y ] && [ "$confirmation" != Y ]; then
  echo "Uninstall cancelled"
  exit
fi

echo "Removing ~/.oh-my-zsh"
if [ -d ~/.oh-my-zsh ]; then
  rm -rf ~/.oh-my-zsh
fi

if [ -e ~/.zshrc ]; then
  ZSHRC_SAVE=~/.zshrc.omz-uninstalled-$(date +%Y-%m-%d_%H-%M-%S)
  echo "Found ~/.zshrc -- Saving your current config to ${ZSHRC_SAVE}"
  echo "  (this file contains your current zsh configuration)"
  mv ~/.zshrc "${ZSHRC_SAVE}"
fi

echo "Looking for original zsh config..."
ZSHRC_ORIG=~/.zshrc.pre-oh-my-zsh
if [ -e "$ZSHRC_ORIG" ]; then
  ZSHRC_ORIG_DATE=$(date -r "$ZSHRC_ORIG" "+%Y-%m-%d" 2>/dev/null || date -d "@$(stat -c %Y "$ZSHRC_ORIG" 2>/dev/null)" "+%Y-%m-%d" 2>/dev/null || echo "unknown date")
  echo "Found $ZSHRC_ORIG (last modified: ${ZSHRC_ORIG_DATE})"
  echo "This is the zsh config that existed before Oh My Zsh was installed."
  printf "Restore it as ~/.zshrc? [y/N] "
  read -r restore_confirmation
  if [ "$restore_confirmation" = y ] || [ "$restore_confirmation" = Y ]; then
    mv "$ZSHRC_ORIG" ~/.zshrc
    echo "Your original zsh config was restored to ~/.zshrc."
    if [ -n "$ZSHRC_SAVE" ]; then
      echo "Your Oh My Zsh config is saved at ${ZSHRC_SAVE} if you need it."
    fi
  else
    echo "Skipping restore."
    if [ -n "$ZSHRC_SAVE" ]; then
      echo ""
      echo "Your files are at:"
      echo "  Current config : ${ZSHRC_SAVE}"
      echo "  Pre-OMZ backup : ${ZSHRC_ORIG}"
      echo "You can review and merge them manually."
    fi
  fi
else
  echo "No original zsh config found."
  if [ -n "$ZSHRC_SAVE" ]; then
    echo "Your current config is saved at ${ZSHRC_SAVE}."
  fi
fi

echo "Thanks for trying out Oh My Zsh. It's been uninstalled."
echo "Don't forget to restart your terminal!"