#!/bin/bash
# AI Profile Router – Installation/Update auf dem Zielsystem.
# Wird als root auf dem Zielsystem ausgeführt (per SSH, vgl. deploy.sh).
# Erwartet ai_profile_router.py, image_worker.py und mike-ai-profile-router.service
# im selben Verzeichnis wie dieses Skript.
set -euo pipefail

DIR="$(cd "$(dirname "$0")" && pwd)"
INSTALL_DIR=/opt/mike-ai/ai-profile-router
SERVICE=mike-ai-profile-router.service
OLD_SERVICE=mike-ai-local-llm-router.service
OLD_DIR=/opt/mike-ai/local-llm-router
BACKUP_DIR=/opt/mike-ai/.backup-ai-profile-router-$(date +%Y%m%d-%H%M%S)
VENV="$INSTALL_DIR/venv"
MODEL_DIR=/opt/mike-ai/models/FLUX.2-klein-base-4B
IMAGE_DIR="$INSTALL_DIR/images"

echo "== AI Profile Router: Installation/Update =="

# --- 1. Bestehenden (alten) Router entfernen, mit Backup -------------------
if [ -f "/etc/systemd/system/${OLD_SERVICE}" ]; then
  echo "-- Entferne alten Router ${OLD_SERVICE} (Backup: ${BACKUP_DIR})"
  mkdir -p "$BACKUP_DIR"
  systemctl stop "$OLD_SERVICE" 2>/dev/null || true
  systemctl disable "$OLD_SERVICE" 2>/dev/null || true
  mv "/etc/systemd/system/${OLD_SERVICE}" "$BACKUP_DIR/"
  if [ -d "$OLD_DIR" ]; then
    mv "$OLD_DIR" "$BACKUP_DIR/local-llm-router"
  fi
else
  echo "-- Kein alter Router gefunden"
fi

# --- 2. Neue Dateien installieren -------------------------------------------
mkdir -p "$INSTALL_DIR" "$IMAGE_DIR"
install -m 0755 "$DIR/ai_profile_router.py" "$INSTALL_DIR/ai_profile_router.py"
install -m 0755 "$DIR/image_worker.py" "$INSTALL_DIR/image_worker.py"
install -m 0644 "$DIR/${SERVICE}" "/etc/systemd/system/${SERVICE}"

# --- 3. Python-Venv mit Bild-Abhängigkeiten ---------------------------------
if [ ! -x "$VENV/bin/python" ]; then
  echo "-- Erstelle Python-Venv in $VENV"
  python3 -m venv "$VENV"
fi
echo "-- Installiere/aktualisiere Bild-Abhängigkeiten (torch, diffusers, ...)"
"$VENV/bin/pip" install --quiet --upgrade pip
"$VENV/bin/pip" install --quiet \
  torch \
  diffusers \
  transformers \
  accelerate

# --- 4. FLUX-Modell (nur wenn noch nicht vorhanden) --------------------------
if [ -f "$MODEL_DIR/model_index.json" ]; then
  echo "-- FLUX-Modell vorhanden: $MODEL_DIR"
else
  echo "-- Lade FLUX.2-klein-base-4B nach $MODEL_DIR (kann dauern)"
  "$VENV/bin/python" - <<'PY'
import os
from huggingface_hub import snapshot_download
snapshot_download(
    repo_id="black-forest-labs/FLUX.2-klein-base-4B",
    local_dir="/opt/mike-ai/models/FLUX.2-klein-base-4B",
    local_dir_use_symlinks=False,
)
print("Modell-Download abgeschlossen")
PY
fi

# --- 5. Service aktivieren und starten ---------------------------------------
systemctl daemon-reload
systemctl enable "$SERVICE"
systemctl restart "$SERVICE"

# --- 6. Verifikation ----------------------------------------------------------
sleep 1
if ! systemctl is-active --quiet "$SERVICE"; then
  echo "-- FEHLER: Service läuft nicht" >&2
  journalctl -u "$SERVICE" -n 20 --no-pager >&2
  exit 1
fi
echo "-- Service läuft"
curl -sf "http://127.0.0.1:8081/status" | python3 -m json.tool
echo "== Fertig =="