var api = {};

api.poll = function() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE) {
           if (xmlhttp.status == 200) {
               api.update(xmlhttp.responseText);
           }
        }
    };

    // Send the request
    xmlhttp.open("GET", window.location.href+"/graph", true);
    xmlhttp.send();
};


api.update = function(s) {
    json = JSON.parse(s);
    graph.update(json);
}

api.edit = function(edit) {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE) {
           if (xmlhttp.status == 200) {
               api.update(xmlhttp.responseText);
           }
        }
    };

    // Send the request
    xmlhttp.open("POST", window.location.href+"/edit", true);
    xmlhttp.setRequestHeader("Content-Type", "application/json");
    xmlhttp.send(JSON.stringify(edit));
}

// Launch the polling loop
setInterval(api.poll, 1000);