#!/bin/bash

# Function to create a new user
create_user() {
    read -p "Enter username: " username
    sudo useradd -m $username
    echo "User $username created."
    sudo passwd $username
}

# Function to create multiple users from a file
bulk_create_users() {
    while read user; do sudo useradd -m "$user"; done < users.txt
}

# Function to update system and install essential packages
update_system() {
    echo "Updating system..."
    if [[ -f /usr/bin/apt ]]; then
        sudo apt update && sudo apt upgrade -y
        sudo apt install -y vim curl wget git
    elif [[ -f /usr/bin/yum ]]; then
        sudo yum update -y
    fi
}

# Function to perform automated backups
backup_system() {
    echo "Performing backup..."
    tar -czf /backup/home_$(date +%F).tar.gz /home/
}

# Function to clean up logs
cleanup_logs() {
    echo "Cleaning up logs..."
    find /var/log -name "*.log" -mtime +7 -exec rm {} \;
}

# Function to check system health
system_health_check() {
    echo "Checking system health..."
    df -h
    free -m
    uptime
}

# Function to troubleshoot network
network_check() {
    echo "Checking network status..."
    ping -c 4 google.com
    netstat -tulnp
    ip a | grep inet
}

# Function to monitor and restart a service
monitor_service() {
    service_name="apache2"
    if ! systemctl is-active --quiet $service_name; then
        echo "$service_name is down. Restarting..."
        sudo systemctl restart $service_name
    fi
}

# Function to automate SSH login & remote command execution
remote_command() {
    ssh user@remote-server "df -h"
}

# Run all functions
create_user
bulk_create_users
update_system
backup_system
cleanup_logs
system_health_check
network_check
monitor_service
remote_command

echo "All tasks completed successfully!"