#!/bin/bash
set -euo pipefail

## RunME:
## wget -c -O /root/debian12-to-13-upgrade.sh https://ftp.info-linux.de/arbeiten/Debian/debian12-to-13-upgrade.txt && chmod 755 /root/debian12-to-13-upgrade.sh && /root/debian12-to-13-upgrade.sh

### --- Konfiguration ---
NEW_CODENAME="trixie"
BACKUP_DIR="/root/upgrade-backup-$(date +%F-%H%M%S)"

echo "=== Debian 12 → $NEW_CODENAME Upgrade starten ==="
echo "Backup-Verzeichnis: $BACKUP_DIR"
sleep 2

### --- 1. Backup ---
echo "[1/8] Backup von /etc anlegen..."
mkdir -p "$BACKUP_DIR"
tar czf "$BACKUP_DIR/etc-backup.tar.gz" /etc

### --- 2. System auf aktuellen Stand bringen ---
echo "[2/8] System aktualisieren (bookworm)..."
export DEBIAN_FRONTEND=noninteractive
apt update
apt -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" -y full-upgrade
apt --fix-broken install -y
dpkg --audit || true

### --- 3. Alte Repos prüfen ---
echo "[3/8] Repositories prüfen..."
grep -rE "bookworm|bullseye|bionic|stretch" /etc/apt/sources.list /etc/apt/sources.list.d/ || true

### --- 4. sources.list & sources.d umstellen ---
echo "[4/8] APT-Quellen auf $NEW_CODENAME umstellen..."
cp /etc/apt/sources.list "$BACKUP_DIR/sources.list.bak"
cp -a /etc/apt/sources.list.d "$BACKUP_DIR/sources.list.d.bak"

sed -i "s/bookworm/${NEW_CODENAME}/g" /etc/apt/sources.list
find /etc/apt/sources.list.d/ -type f -name "*.list" -exec sed -i "s/bookworm/${NEW_CODENAME}/g" {} \;
sed -i "s/bookworm-backports/${NEW_CODENAME}-backports/g" /etc/apt/sources.list || true
find /etc/apt/sources.list.d/ -type f -name "*.list" -exec sed -i "s/bookworm-backports/${NEW_CODENAME}-backports/g" {} \;

### --- 5. Upgrade durchführen ---
echo "[5/8] Upgrade auf ${NEW_CODENAME} durchführen..."
apt update
apt -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" -y upgrade
apt -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" -y full-upgrade

### --- 6. Kernel aktualisieren ---
echo "[6/8] Kernel aktualisieren..."
apt install -y linux-image-arm64 linux-headers-arm64

### --- 7. Aufräumen ---
echo "[7/8] Aufräumen..."
apt autoremove --purge -y
apt clean

### --- 8. Abschluss ---
echo "[8/8] Upgrade abgeschlossen."
echo "Backup befindet sich unter: $BACKUP_DIR"
echo

read -p "System jetzt neu starten? [j/N]: " confirm
case "$confirm" in
    [jJ]|[jJ][aA])
        echo "→ Neustart wird durchgeführt..."
        sleep 3
        reboot
        ;;
    *)
        echo "→ Neustart abgebrochen. Bitte manuell durchführen, wenn bereit."
        ;;
esac