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function generateKey() {
    var keytype = 0;

    for (var i = 1; i <= 4; i++) {
        var typeradio = document.getElementById('fbxcfgwww_wifi_radio_' + i);
        if (!typeradio)
            continue;
        if (typeradio.checked) {
            if (typeradio.value == 1) {
                keytype = 1;
            }

            if (typeradio.value >= 2 &&
                typeradio.value <= 4) {
                keytype = 2;
            }
        }
    }

    if (keytype == 0)
        return false;

    var chars;
    var len;
    if (keytype == 1) {
        chars = "0123456789ABCDEF";
        len = 10;
    } else {
        chars = ' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890_\-;.?,:!%*^&~{}()|@=+<>';
        len = 63;
    }

    var key = '';
    for (var i = 0; i < len; i++) {
        var rnd = Math.floor(Math.random() * chars.length);
        key += chars.charAt(rnd);
    }

    var keytext = document.getElementById('fbxcfgwww_wifi_text_1');
    if (!keytext)
        return false;
    keytext.value = key;
}

function changeLanPfx() {

    var routerdiv = document.getElementById('fbxcfgwww_div');
    var lan_pfx = document.getElementById('fbxcfgwww_router_lan_pfx');

    if (!routerdiv || !lan_pfx)
        return false;

    var elements = routerdiv.getElementsByTagName('input');
    for (var i = 0, n = elements.length; i < n; ++i) {
        if (elements[i].name == 'lan_pfx_copy')
            elements[i].value = lan_pfx.value;
    }
}

function copyValue(oldrow, newrow) {

    function update(type) {
        var oelements = oldrow.getElementsByTagName(type);
        var nelements = newrow.getElementsByTagName(type);

        if (oelements.length != nelements.length)
            return false;

        for (var i = 0; i < oelements.length; i++)
            nelements[i].value = oelements[i].value;
    }
    update('input');
    update('select');
}

function changeNames(row, index) {
    var re = /(.*_)(\d+|new)$/;
    var rt = '$1' + index;

    function update(type) {
        var elements = row.getElementsByTagName(type);
        for (var i = 0, n = elements.length; i < n; i++) {
            var newname = elements[i].name.replace(re, rt);
            elements[i].setAttribute('name', newname);
        }
    }
    update('input');
    update('select');
}

function resetRow(row) {

    var elements = row.getElementsByTagName('input');
    for (var i = 0, n = elements.length; i < n; ++i) {
        elements[i].value = '';
    }
}

function arrayInsert(button) {
    var fcell, clone, frow, brows, fsection, bsection, tbl;

    if ((fcell = button.parentNode) &&
        (frow = fcell.parentNode) &&
        (fsection = frow.parentNode) &&
        (tbl = fsection.parentNode) &&
        (bsection = tbl.tBodies[0]) &&
        (brows = bsection.rows) &&
        frow.cloneNode &&
        bsection.appendChild) {

        var oldval = button.value;
        var oldid = button.id;

        button.value = 'X';
        button.id = 'array_del';

        if ((clone = frow.cloneNode(true)) &&
            clone.getElementsByTagName) {
            copyValue(frow, clone);
            bsection.appendChild(clone);
            changeNames(clone, bsection.rows.length - 1);
        }

        resetRow(frow);
        button.value = oldval;
        button.id = oldid;
        changeLanPfx();

        return false;
    }
    return true;
}

function arrayRemove(button) {
    var cell, row, section;

    if ((cell = button.parentNode) &&
        (row = cell.parentNode) &&
        (section = row.parentNode) &&
        section.deleteRow &&
        section.rows) {

        for (i = row.sectionRowIndex + 1; i < section.rows.length;
             i++) {
            changeNames(section.rows[i], i - 1);
        }

        section.deleteRow(row.sectionRowIndex);
        return false;
    }
    return true;
}

function arrayAction(button) {
    if (button.id.match('.*array_insert$')) {
        arrayInsert(button);
    } else {
        arrayRemove(button);
    }
}

function setWifiEnabled() {
    var wifi_check = document.getElementById('wifi_enable_check');
    wifi_check.checked = true;
}

function setRouterEnabled() {
    var router_check = document.getElementById('router_enable_check');
    router_check.checked = true;
}