New refactoring broadcom..

#!/usr/bin/env bash

# breaking the code with SOLID

function download_and_verify() {
    local url="$1"
    local filename="$2"

    wget -q "$url" -O "$filename"

    if [ -s "$filename" ]; then
        echo "Download de $filename bem-sucedido."
    else
        echo "Falha ao fazer o download de $filename."
        exit 1
    fi
}

function execute_with_sudo() {
    local command="$1"
    sudo $command
}

function update_system() {
    execute_with_sudo "apt update && apt upgrade"
}

function install_prerequisites() {
    execute_with_sudo "apt install linux-headers-$(uname -r) build-essential dkms"
}

function remove_old_drivers() {
    execute_with_sudo "apt purge bcmwl-kernel-source"
}

function install_broadcom_firmware() {
    local firmware_urls=("http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2"
                         "http://downloads.openwrt.org/sources/broadcom-wl-5.10.56.27.3_mipsel.tar.bz2")
    local firmware_files=("broadcom-wl-5.100.138.tar.bz2"
                          "broadcom-wl-5.10.56.27.3_mipsel.tar.bz2")

    for i in ${!firmware_urls[@]}; do
        download_and_verify "${firmware_urls[$i]}" "${firmware_files[$i]}"
        tar -xf "${firmware_files[$i]}"
    done

    if [ -e "${firmware_files[0]}" ] && [ -e "${firmware_files[1]}" ]; then
        execute_with_sudo "b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o"
    else
        echo "Falha ao encontrar os arquivos de firmware necessários."
        exit 1
    fi
}

function load_b43_driver() {
    execute_with_sudo "modprobe b43"
}

function check_driver_status() {
    dmesg | grep b43
}

function main() {
    clear
    update_system
    install_prerequisites
    remove_old_drivers
    install_broadcom_firmware
    load_b43_driver
    check_driver_status
}

main