#!/bin/bash
# Auto-update Docker-Compose stacks nach Git-Pull
# Läuft als dockeradmin, prüft geänderte Compose-Dateien
# Stillgelegte Container werden ignoriert

REPO_DIR="/srv/docker"
LOGFILE="/var/log/docker-update.log"

INACTIVE_CONTAINERS=("adguard" "kea" "caddy" "wikijs")

log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') | $*" | tee -a "$LOGFILE"
}

log "===== Starting Auto-Update (changed Compose only) ====="

cd "$REPO_DIR" || { log "ERROR: Cannot enter $REPO_DIR"; exit 1; }

# 1️⃣ Pull neueste Änderungen
git fetch --all &>/dev/null
git reset --hard origin/main &>/dev/null
log "Pulled latest changes from Git."

# 2️⃣ Geänderte Compose-Dateien ermitteln
CHANGED=$(git diff --name-only HEAD~1 HEAD | grep -E '^compose/.+/docker-compose\.yml$' || true)

if [ -z "$CHANGED" ]; then
    log "No Compose files changed. Nothing to update."
    exit 0
fi

# 3️⃣ Nur geänderte Container updaten
for FILE in $CHANGED; do
    CONTAINER_NAME=$(echo "$FILE" | cut -d'/' -f2)

    # Inaktive Container überspringen
    if [[ " ${INACTIVE_CONTAINERS[@]} " =~ " ${CONTAINER_NAME} " ]]; then
        log "Skipping inactive container: $CONTAINER_NAME"
        continue
    fi

    COMPOSE_DIR="$REPO_DIR/compose/$CONTAINER_NAME"
    if [ ! -d "$COMPOSE_DIR" ]; then
        log "Warning: $COMPOSE_DIR does not exist, skipping..."
        continue
    fi

    log "Updating container: $CONTAINER_NAME"
    cd "$COMPOSE_DIR" || continue
    docker compose pull &>/dev/null
    docker compose up -d &>/dev/null

    if [ $? -eq 0 ]; then
        log "✅ $CONTAINER_NAME updated successfully"
    else
        log "❌ Failed to update $CONTAINER_NAME"
    fi
done

log "===== Auto-Update Completed ====="