#!/usr/bin/env bash
set -euo pipefail

### CONFIG ###
OPENWEBUI_IMAGE="ghcr.io/open-webui/open-webui:main"
### /CONFIG ###

echo "=== Step 2: Install Docker, Ollama, and Open WebUI ==="

if [[ $EUID -ne 0 ]]; then
  echo "Please run this script as root, e.g.: sudo bash $0"
  exit 1
fi

# Figure out the "real" user so we put Open WebUI in their home
REALUSER="${SUDO_USER:-$USER}"
USER_HOME="$(eval echo ~${REALUSER})"
OPENWEBUI_DIR="${USER_HOME}/open-webui"

echo "Real user: ${REALUSER}"
echo "User home: ${USER_HOME}"
echo "Open WebUI directory: ${OPENWEBUI_DIR}"
echo

# --- Sanity check: GPU must be visible now ---
if ! command -v nvidia-smi >/dev/null 2>&1; then
  echo "WARNING: nvidia-smi not found."
  echo "Make sure you ran 00-gpu-driver.sh and rebooted successfully."
  echo "You can still continue, but GPU usage may not work."
else
  echo "nvidia-smi output:"
  nvidia-smi || true
fi

echo
echo "Step 1/3: Installing Docker Engine + Docker Compose..."

# Remove old Docker bits if present (ignore errors)
apt-get remove -y docker docker-engine docker.io containerd runc || true

# Add Docker’s official GPG key
install -m 0755 -d /etc/apt/keyrings
if [ ! -f /etc/apt/keyrings/docker.gpg ]; then
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
    gpg --dearmor -o /etc/apt/keyrings/docker.gpg
  chmod a+r /etc/apt/keyrings/docker.gpg
fi

# Add Docker apt repository
UBUNTU_CODENAME="$(. /etc/os-release && echo "$VERSION_CODENAME")"
if [ ! -f /etc/apt/sources.list.d/docker.list ]; then
  echo \
    "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
    ${UBUNTU_CODENAME} stable" > /etc/apt/sources.list.d/docker.list
fi

apt-get update -y
apt-get install -y \
  docker-ce \
  docker-ce-cli \
  containerd.io \
  docker-buildx-plugin \
  docker-compose-plugin

systemctl enable --now docker

echo "Docker version:"
docker --version || true
echo "Docker Compose plugin version:"
docker compose version || true

echo
echo "Step 2/3: Installing Ollama (GPU-enabled)..."

# Let Ollama's installer run even if its CUDA driver step fails
set +e
curl -fsSL https://ollama.com/install.sh | sh
OLLAMA_RC=$?
set -e

if [ $OLLAMA_RC -ne 0 ]; then
  echo "WARNING: Ollama installer returned non-zero (likely CUDA driver conflicts)."
  echo "As long as you have a working NVIDIA driver (nvidia-smi works), you can ignore this."
fi

# Make sure the service is enabled & running
systemctl enable --now ollama || true

echo "Waiting for Ollama API on http://127.0.0.1:11434 ..."
for i in {1..30}; do
  if curl -sSf http://127.0.0.1:11434/api/version >/dev/null 2>&1; then
    echo "Ollama is up!"
    break
  fi
  sleep 2
done

if ! curl -sSf http://127.0.0.1:11434/api/version >/dev/null 2>&1; then
  echo "WARNING: Ollama API not responding yet. Check 'systemctl status ollama'."
fi

echo
echo "Step 3/3: Setting up Open WebUI with Docker Compose..."

mkdir -p "${OPENWEBUI_DIR}"
cd "${OPENWEBUI_DIR}"

cat > docker-compose.yml <<'EOF'
version: "3.8"

services:
  open-webui:
    image: ghcr.io/open-webui/open-webui:main
    container_name: open-webui
    restart: unless-stopped
    network_mode: "host"
    environment:
      - OLLAMA_BASE_URL=http://127.0.0.1:11434
      # Uncomment to disable auth (optional, not recommended on exposed hosts)
      # - OPENWEBUI_AUTH=False
    volumes:
      - ./data:/app/backend/data
EOF

echo "docker-compose.yml created at ${OPENWEBUI_DIR}/docker-compose.yml"

docker compose up -d

echo
echo "==================== DONE ===================="
echo "Ollama service:   systemctl status ollama"
echo "Open WebUI stack: cd ${OPENWEBUI_DIR} && docker compose ps"
echo
echo "Access Open WebUI at:"
echo "  http://<your-server-ip>:8080"
echo "=============================================="