#!/bin/bash

GIT_REPO_PATH=$(mktemp -d)

git config --global user.email "$GIT_USER_MAIL"
git config --global user.name "$GIT_USERNAME"

echo "[INFO] check variables..."
if [ -z "$GIT_REPO_DEPLOY_KEY" ] ; then
    echo "[ERROR] \$GIT_REPO_DEPLOY_KEY is not set."
    exit 3
fi
if [ -z "$GIT_REPO_URL" ] ; then
    echo "[ERROR] \$GIT_REPO_URL is not set."
    exit 3
fi
if [ -z "$INTERVAL" ] ; then
    echo "[ERROR] \$INTERVAL is not set."
    exit 3
fi
if [ -z "$GIT_REPO_BRANCH" ] ; then
    echo "[ERROR] \$GIT_REPO_BRANCH is not set."
    exit 3
fi
if [ -z "$GIT_USERNAME" ] ; then
    echo "[ERROR] \$GIT_USERNAME is not set."
    exit 3
fi
if [ -z "$GIT_USER_MAIL" ] ; then
    echo "[ERROR] \$GIT_USER_MAIL is not set."
    exit 3
fi
if [ -z "$GIT_REPO_REMOTE_NAME" ] ; then
    echo "[ERROR] \$GIT_REPO_REMOTE_NAME is not set."
    exit 3
fi
if [ -z "$DEVICES" ] ; then
    echo "[ERROR] \$DEVICES is not set."
    exit 3
fi

echo "[INFO] clone repository..."
if GIT_SSH_COMMAND="ssh -o StrictHostKeyChecking=no -i $GIT_REPO_DEPLOY_KEY" git clone "$GIT_REPO_URL" "$GIT_REPO_PATH" --quiet > /dev/null; then
  cd "$GIT_REPO_PATH" || exit
else
  echo "[ERROR] Failed to clone repository."
  exit 1
fi

while true ; do
  echo "[INFO] pull repository..."
  git pull --quiet &> /dev/null

  # Save the current value of IFS to restore later
  OLD_IFS=$IFS

  # Set the IFS to a comma to split the values
  IFS=','

  while read -r FQDN USERNAME SSH_KEY_PATH; do
    # bereinige FQDN
    FQDN=$(echo "$FQDN" | tr -d "[:space:]")
    # prüfe ob Key existiert
    if [ ! -e "$SSH_KEY_PATH" ] ; then
      echo "[ERROR] File $SSH_KEY_PATH does not exist"
      echo "[ERROR] can not export $FQDN config"
      exit 2
    fi
    # check if target is reachable
    if ssh -n -q -i "$SSH_KEY_PATH" -o StrictHostKeyChecking=no -o BatchMode=yes -o ConnectTimeout=5 "${USERNAME}@${FQDN}" ; then
      echo "[INFO] export $FQDN config..."
      ssh -n -o StrictHostKeyChecking=no -i "$SSH_KEY_PATH" "${USERNAME}@${FQDN}" "/export show-sensitive" > "config_${FQDN}.rsc" 2> /dev/null
      # entferne Datumszeile
      sed -i -r '/^# [0-9]{4}-[0-9]{2}-[0-9]{2}\s[0-9]{2}\:[0-9]{2}\:[0-9]{2}\sby\sRouterOS\s[0-9\s\.]+/d' "config_${FQDN}.rsc"
      git add "config_${FQDN}.rsc"
      echo "[INFO] commit config for ${FQDN} ..."
      git commit -m "update config_${FQDN}" --quiet > /dev/null
    else
      echo "[ERROR] ${FQDN} not reachable!"
    fi
  done <<< "$DEVICES"

  echo "[INFO] push config(s)..."
  GIT_SSH_COMMAND="ssh -o StrictHostKeyChecking=no -i $GIT_REPO_DEPLOY_KEY" git push > /dev/null

  # Restore the original IFS value
  IFS=$OLD_IFS

  # loop
  echo "[INFO] sleep..."
  sleep "$INTERVAL"

done