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

    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);

            tabs.innerHTML = '';
            if(resp.result && resp.result.responses) {
                for(var i = 0; i < resp.result.responses.length; ++i) {
                    (function(response) {
                        var tab = document.createElement('a'),
                            tabHeader = document.createElement('div'),
                            tabServer = document.createElement('div');

                        tab.href = 'javascript:;';
                        tab.className = 'whois-result-tab';
                        if(i === 0) tab.className += ' whois-result-tab-active';

                        tab.onclick = function() {
                            var active = document.querySelector('.whois-result-tab-active');
                            if(active) active.classList.remove('whois-result-tab-active');
                            tab.classList.add('whois-result-tab-active');
                            result.textContent = response.lines.join("\r\n").trim();
                        };

                        tabHeader.className = 'whois-result-tab-header';
                        tabHeader.textContent = i === 0 ? 'Result' : ('Hop #' + (resp.result.responses.length - i).toString());

                        tabServer.className = 'whois-result-tab-server';
                        tabServer.textContent = response.server;
                        console.log(response);

                        tab.appendChild(tabHeader);
                        tab.appendChild(tabServer);
                        tabs.appendChild(tab);
                    })(resp.result.responses[i]);
                }
            }

            if(tabs.firstChild)
                tabs.firstChild.click();

            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();
})();