#!/bin/bash

# Backstor UI Installer Script

set -e

# Colors
GREEN='\033[0;32m'
RED='\033[0;31m'
NC='\033[0m' # No Color

echo -e "${GREEN}Starting Backstor UI Installation...${NC}"

# Check for root/sudo
if [ "$EUID" -ne 0 ]; then 
  echo -e "${RED}Please run as root (use sudo)${NC}"
  exit 1
fi

PROJECT_DIR=$(pwd)
SERVER_DIR="$PROJECT_DIR/server"
SERVICE_NAME="backstor"

# 1. Install Node.js Dependencies
echo "Installing Node.js dependencies..."
if [ -d "$SERVER_DIR" ]; then
    cd "$SERVER_DIR"
    if [ ! -d "node_modules" ]; then
        npm install
    else
        echo "node_modules already exists. Skipping npm install."
    fi
else
    echo -e "${RED}Error: server directory not found at $SERVER_DIR${NC}"
    exit 1
fi

# 2. Setup Environment Variables
echo "Setting up environment configuration..."
if [ ! -f ".env" ]; then
    if [ -f ".env.example" ]; then
        cp .env.example .env
        echo -e "${GREEN}Created .env from .env.example.${NC}"
        echo "Please edit $SERVER_DIR/.env with your database configuration."
    else
        echo -e "${RED}Warning: .env.example not found.${NC}"
    fi
else
    echo ".env already exists."
fi

# 3. Create Systemd Service
echo "Creating systemd service..."

# Detect the user who owns the project directory to run the service as
REAL_USER=$(stat -c '%U' "$PROJECT_DIR")
NODE_PATH=$(which node)

cat > /etc/systemd/system/$SERVICE_NAME.service <<EOF
[Unit]
Description=Backstor UI Service
After=network.target postgresql.service

[Service]
Type=simple
User=$REAL_USER
WorkingDirectory=$SERVER_DIR
ExecStart=$NODE_PATH index.js
Restart=on-failure
Environment=PORT=3000

[Install]
WantedBy=multi-user.target
EOF

echo -e "${GREEN}Service file created at /etc/systemd/system/$SERVICE_NAME.service${NC}"

# 4. Enable and Start Service
echo "Enabling and starting service..."
systemctl daemon-reload
systemctl enable $SERVICE_NAME
systemctl restart $SERVICE_NAME

echo -e "${GREEN}Installation Complete!${NC}"
echo -e "You can check the status with: ${GREEN}systemctl status $SERVICE_NAME${NC}"
echo -e "Access the UI at: ${GREEN}http://$(hostname -I | awk '{print $1}'):3000${NC}"