#!/bin/bash
# IPMI Controller - lm-sensors HTTP Server Setup
# Run this on your Proxmox/Dell server to expose sensors over HTTP

set -e

echo "🌡️  IPMI Controller - lm-sensors HTTP Setup"
echo "============================================"

# Check if running as root
if [ "$EUID" -ne 0 ]; then 
    echo "❌ Please run as root (sudo)"
    exit 1
fi

# Install lm-sensors if not present
echo ""
echo "📦 Checking lm-sensors..."
if ! command -v sensors &> /dev/null; then
    echo "Installing lm-sensors..."
    apt-get update
    apt-get install -y lm-sensors
    
    echo ""
    echo "🔧 Running sensors-detect..."
    echo "Answer YES to all questions or use default values"
    sensors-detect --auto
else
    echo "✓ lm-sensors already installed"
fi

# Install netcat if not present
if ! command -v nc &> /dev/null; then
    echo "Installing netcat..."
    apt-get install -y netcat-openbsd
fi

# Create the HTTP sensors server script
SERVER_SCRIPT="/usr/local/bin/sensors-http-server.sh"

echo ""
echo "📝 Creating HTTP server script..."
cat > "$SERVER_SCRIPT" << 'EOF'
#!/bin/bash
# lm-sensors HTTP Server for IPMI Controller
# Serves sensor data on port 8888

PORT=${1:-8888}

echo "Starting lm-sensors HTTP server on port $PORT..."
echo "Access via: http://$(hostname -I | awk '{print $1}'):$PORT"

while true; do
    {
        echo -e "HTTP/1.1 200 OK\r"
        echo -e "Content-Type: text/plain\r"
        echo -e "Access-Control-Allow-Origin: *\r"
        echo -e "\r"
        sensors -u 2>/dev/null || echo "Error reading sensors"
    } | nc -l -p "$PORT" -q 1
done
EOF

chmod +x "$SERVER_SCRIPT"
echo "✓ Created $SERVER_SCRIPT"

# Create systemd service
SERVICE_FILE="/etc/systemd/system/sensors-http.service"

echo ""
echo "🔧 Creating systemd service..."
cat > "$SERVICE_FILE" << EOF
[Unit]
Description=lm-sensors HTTP Server for IPMI Controller
After=network.target

[Service]
Type=simple
ExecStart=$SERVER_SCRIPT 8888
Restart=always
RestartSec=5
User=root

[Install]
WantedBy=multi-user.target
EOF

echo "✓ Created $SERVICE_FILE"

# Reload systemd and enable service
echo ""
echo "🚀 Enabling and starting service..."
systemctl daemon-reload
systemctl enable sensors-http.service
systemctl start sensors-http.service

# Check status
sleep 2
if systemctl is-active --quiet sensors-http.service; then
    echo "✓ Service is running!"
    echo ""
    echo "🌐 HTTP Endpoint: http://$(hostname -I | awk '{print $1}'):8888"
    echo ""
    echo "Test with: curl http://$(hostname -I | awk '{print $1}'):8888"
else
    echo "⚠️  Service failed to start. Check logs:"
    echo "   journalctl -u sensors-http.service -f"
fi

echo ""
echo "📋 Management Commands:"
echo "  Start:   sudo systemctl start sensors-http"
echo "  Stop:    sudo systemctl stop sensors-http"
echo "  Status:  sudo systemctl status sensors-http"
echo "  Logs:    sudo journalctl -u sensors-http -f"
echo ""
echo "✅ Setup complete!"