#!/usr/bin/env bash

unlimit() {
    sudo tc qdisc del dev lo root
}

limit() {

    if [ "$1" = "5Mbps" ]; then
        sudo tc qdisc del dev lo root
        sudo tc qdisc add dev lo handle 1: root htb default 11
        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 5000kbit
        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 38ms loss 0.09%
    elif [ "$1" = "10Mbps" ]; then
        sudo tc qdisc del dev lo root
        sudo tc qdisc add dev lo handle 1: root htb default 11
        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 10000kbit
        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 32ms loss 0.09%
    elif [ "$1" = "20Mbps" ]; then
        sudo tc qdisc del dev lo root
        sudo tc qdisc add dev lo handle 1: root htb default 11
        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 20000kbit
        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 25ms loss 0.09%
    else
        echo -e >&2 "\x1B[31;1merror:\x1B[0m preset $1 not found"
        exit 1
    fi
}

if [ $# -eq 0 ]; then
    echo -e >&2 "\x1B[31;1merror:\x1B[0m expecting command"
    exit 1
else
    "$@"
fi