#!/bin/bash
set -euo pipefail

NOTIF_CFG="/etc/pve/notifications.cfg"
PRIV_NOTIF_CFG="/etc/pve/priv/notifications.cfg"

# -----------------------------
# Backup-Funktion
# -----------------------------
backup_file() {
  local file=$1
  if [ -f "$file" ]; then
    local bak="${file}.bak.$(date +%Y%m%d%H%M%S)"
    cp "$file" "$bak"
    echo "Backup erstellt: $bak"
  fi
}

# -----------------------------
# Pflichtfeld-Reader
# $1 = Prompt
# $2 = Variablenname
# $3 = Optionaler Default
# -----------------------------
read_required() {
  local prompt="$1"
  local varname="$2"
  local default="${3:-}"
  local input

  while true; do
    if [[ -n "$default" ]]; then
      read -rp "$prompt [$default]: " input
      input=${input:-$default}
    else
      read -rp "$prompt: " input
    fi

    if [[ -n "$input" ]]; then
      printf -v "$varname" '%s' "$input"
      break
    fi

    echo "❌ Eingabe darf nicht leer sein!"
  done
}

# -----------------------------
# Backups
# -----------------------------
backup_file "$NOTIF_CFG"
backup_file "$PRIV_NOTIF_CFG"

echo
echo "Bitte die SMTP Notification Konfiguration eingeben:"
echo "(Alle Felder sind Pflicht – Enter übernimmt ggf. den Default)"
echo

# -----------------------------
# Eingaben
# -----------------------------
read_required "Author" AUTHOR
read_required "From-Address" FROMADDR

read_required "Empfänger-Mailadresse (mailto)" MAILTO "admin@vmd55888.de"
read_required "SMTP Server" SERVER "mail.vmd55888.de"
read_required "SMTP Port" PORT "587"
read_required "Modus (starttls/ssl/none)" MODE "starttls"
read_required "SMTP Benutzername" USERNAME "MH-PVE02@vmd55888.de"

# Passwort (Pflichtfeld, versteckt)
while true; do
  read -rsp "SMTP Passwort: " SMTP_PASS
  echo
  [[ -n "$SMTP_PASS" ]] && break
  echo "❌ Passwort darf nicht leer sein!"
done

# -----------------------------
# notifications.cfg schreiben
# -----------------------------
cat > "$NOTIF_CFG" << EOF
sendmail: mail-to-root
    comment Send mails to root@pam's email address
    disable true
    mailto-user root@pam

matcher: default-matcher
    comment Route all notifications to mail-to-root
    mode all
    target mailout

smtp: mailout
    author $AUTHOR
    from-address $FROMADDR
    mailto $MAILTO
    mailto-user root@pam
    mode $MODE
    port $PORT
    server $SERVER
    username $USERNAME
EOF

# -----------------------------
# priv/notifications.cfg schreiben
# -----------------------------
cat > "$PRIV_NOTIF_CFG" << EOF
smtp: mailout
    password $SMTP_PASS
EOF

echo
echo "✅ Konfiguration neu geschrieben. Bitte WebUI prüfen."