#!/bin/sh

CREDENTIALS="admin:password"
IP="192.168.1.1"
SESSION_ID=""

mode="$1"

get_session_id()
{
    local _attempts=5
    local _iter=1

    local _response="" local _session_id="" local _test_multiuser="" local _kickout_session_id=""

    while [ $_iter -le $_attempts ]; do
        _response=$(curl -s -u $CREDENTIALS http://{$IP}/LED_settings.htm)
        _session_id=$(echo "$_response" | grep -oP "(?<=led_settings.cgi\?id=)[0-9]+")
        if [ -n "$_session_id" ]; then
            echo "$_session_id"
            return 0
        else
            _test_multiuser=$(echo "$_response" | grep -o 'top.location.href = "MNU_access_multiLogin2.htm"')
            if [ -n "$_test_multiuser" ]; then
                _kickout_session_id=$(curl -s -u $CREDENTIALS "http://${IP}/MNU_access_multiLogin2.htm" | grep -Po "(?<=multi_login.cgi\?id=)[0-9]+")
                curl -X POST --data "act=yes" -s -u $CREDENTIALS "http://${IP}/multi_login.cgi?id=$_kickout_session_id" >/dev/null
            fi
        fi
        sleep 1
        _iter=$(( $_iter + 1 ))
    done

    echo "Failed to get session ID!" 1>&2
    exit 1
}

set_mode()
{
    local _mode_value="$1"
    local _response="$(curl -s -X POST -u $CREDENTIALS --data "led_settings=${_mode_value}" "http://${IP}/led_settings.cgi?id=${SESSION_ID}")"
    local _success=$(echo "$_response" | egrep -o "INPUT name=led_now type=hidden value=\"${_mode_value}\" ")
    if [ -z "$_success" ]; then
        echo "LED status change unsuccessful" 1>&2
        exit 1
    fi
}

case $mode in
    "off")
        SESSION_ID=$(get_session_id)
        set_mode "turn_off"
        ;;
    "blink")
        SESSION_ID=$(get_session_id)
        set_mode "en_blink"
        ;;
    "noblink")
        SESSION_ID=$(get_session_id)
        set_mode "dis_blink"
        ;;
    *)
        echo "USAGE: $0 <blink|noblink|off>"
        exit 1
        ;;
esac

exit 0