#!/bin/bash

# Monitor Check-in Setup Script
# This script sets up automated URL check-ins with systemd

set -e  # Exit on error

# Check if running as root
if [[ $EUID -ne 0 ]]; then
    echo "Error: This script must be run as root"
    echo "Please run with: sudo $0"
    exit 1
fi

echo "=========================================="
echo "Monitor Check-in Setup Script"
echo "=========================================="
echo ""

# Prompt for endpoint URL
read -p "Enter the endpoint URL (e.g., https://example.com/your-endpoint): " endpoint_url

# Validate URL format
if [[ ! "$endpoint_url" =~ ^https?:// ]]; then
    echo "Error: URL must start with http:// or https://"
    exit 1
fi

# Create the monitor script
echo "Creating monitor script at /opt/monitor_checkin.sh..."
tee /opt/monitor_checkin.sh > /dev/null <<EOF
#!/bin/bash

url="$endpoint_url"
interval=55

# Wait for network connectivity
echo "Waiting for network connectivity..."
while ! curl -s --connect-timeout 5 "\$url" > /dev/null 2>&1; do
    echo "Network not ready, waiting..."
    sleep 5
done

echo "Network is ready. Script started. Calling URL every 55 seconds..."

while true; do
    curl -s "\$url" > /dev/null
    echo "Called \$url at \$(date '+%Y-%m-%d %H:%M:%S')" >> /var/log/call-url.log
    sleep \$interval
done
EOF

# Make the script executable
echo "Making script executable..."
chmod +x /opt/monitor_checkin.sh

# Create the systemd service
echo "Creating systemd service..."
tee /etc/systemd/system/monitor_checkin.service > /dev/null <<EOF
[Unit]
Description=Call URL Every 55 Seconds to check in with the monitoring server
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=nobody
ExecStart=/opt/monitor_checkin.sh
Restart=on-failure
RestartSec=10
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=multi-user.target
EOF

# Enable and start the service
echo "Reloading systemd daemon..."
systemctl daemon-reload

echo "Enabling monitor_checkin service..."
systemctl enable monitor_checkin.service

echo "Starting monitor_checkin service..."
systemctl start monitor_checkin.service

echo ""
echo "=========================================="
echo "Setup Complete!"
echo "=========================================="
echo ""
echo "Service Status:"
systemctl status monitor_checkin.service

echo ""
echo "View logs with: journalctl -u monitor_checkin.service -f"
echo "Check URL log with: tail -f /var/log/call-url.log"