(function() {
    var locked = false,
        input = document.getElementById('lookup-input'),
        submit = document.getElementById('lookup-submit'),
        result = document.getElementById('lookup-result');

    var lock = function() {
        if(locked)
            return false;

        document.body.classList.add('whois-locked');
        input.disabled = true;
        locked = true;
        return true;
    }

    var unlock = function() {
        if(!locked)
            return false;

        document.body.classList.remove('whois-locked');
        input.disabled = false;
        locked = false;
        return true;
    }

    var lookup = function(target) {
        if(!lock())
            return;

        var xhr = new XMLHttpRequest;
        xhr.addEventListener('load', function() {
            var resp = JSON.parse(xhr.responseText);

            if(resp.error) {
                alert(resp.text);
            } else {
                var lastWhois = resp.result.responses[resp.result.responses.length - 1],
                    isIpAddr = false;

                for(var i = 0; i < lastWhois.lines.length; ++i) {
                    var line = lastWhois.lines[i];
                    if(line.substring(0, 4) === 'inet') {
                        isIpAddr = true;
                        break;
                    }
                }

                var text = '';

                if(isIpAddr) {
                    text += 'RESULTS FOUND: ' + resp.result.responses.length.toString() + "\r\n";
                    for(var i = 0; i < resp.result.responses.length; ++i) {
                        var response = resp.result.responses[i];
                        text += "\r\n-------------\r\n";
                        text += 'Lookup results for ' + resp.result.target + ' from ' + response.server + ":\r\n\r\n";
                        text += response.lines.join("\r\n").trim() + "\r\n";
                    }
                } else {
                    for(var i = 0; i < resp.result.responses.length; ++i) {
                        var response = resp.result.responses[i];
                        text += resp.result.target + ' domain lookup result from ' + response.server + "\r\n\r\n";
                        text += response.lines.join("\r\n").trim() + "\r\n\r\n";
                    }
                }

                result.textContent = text;
            }

            unlock();
        });
        xhr.open('GET', '/whois/lookup?target=' + encodeURIComponent(target));
        xhr.send();
    }

    var readHash = function() {
        if(location.hash.length < 2) {
            result.textContent = 'Enter a domain or IP address!';
            return;
        }

        var target = decodeURIComponent(location.hash.substring(1));
        if(input.value !== target)
            input.value = target;
        lookup(target);
    };

    window.addEventListener('hashchange', function(ev) {
        readHash();
    }, false);

    submit.addEventListener('click', function(ev) {
        ev.preventDefault();
        location.hash = encodeURIComponent(input.value);
    });

    readHash();
})();