// JavaScript i18n
// 24ways.org

function _(s) {
    if (typeof(i18n)!='undefined' && i18n[s]) {
        return i18n[s];
    }
    return s;
}

function sprintf(s) {
    var bits = s.split('%');
    var out = bits[0];
    var re = /^([ds])(.*)$/;
    for (var i=1; i<bits.length; i++) {
        p = re.exec(bits[i]);
        if (!p || arguments[i]==null) continue;
        if (p[1] == 'd') {
            out += parseInt(arguments[i], 10);
        } else if (p[1] == 's') {
            out += arguments[i];
        }
        out += p[2];
    }
    return out;
}

function getValue(e) {
    var p = parseInt(document.getElementById(e).value, 10);
    if (!p || p<0) return 0;
    return p;
}

function pretty_num(n) {
    n += '';
    var o = '';
    for (i=n.length; i>3; i-=3) {
        o = i18n.thousands_sep + n.slice(i-3, i) + o;
    }
    o = n.slice(0, i) + o;
    return o;
}

function pluralise(s, p, n) {
    if (n != 1) return _(p);
    return _(s);
}

function update_text() {
    var hay = getValue('hay');
    var carrots = getValue('carrots');
    var bells = getValue('bells');
    var total = 50 * bells + 30 * hay + 10 * carrots;
    hay = sprintf(pluralise('%s bushel of hay', '%s bushels of hay', hay), pretty_num(hay));
    carrots = sprintf(pluralise('%s carrot', '%s carrots', carrots), pretty_num(carrots));
    bells = sprintf(pluralise('%s shiny bell', '%s shiny bells', bells), pretty_num(bells));
    var list = sprintf(_('%s, %s, and %s'), hay, carrots, bells);
    var out = sprintf(_('You are ordering %s, at a total cost of <strong>%s</strong> gold pieces.'),
        list, pretty_num(total));
    out += ' ';
    out += _('Thank you.');
    document.getElementById('preview').innerHTML = out;
}

window.onload = function() {
    var inputs = document.getElementsByTagName('input');
    for (i=0; i<inputs.length-2; i++) {
        inputs[i].onchange = update_text;
    }
    document.forms[0].onsubmit = function() { return false; };
};