// main.js - Main entry point
const tabs = require('tabs');
const widgets = require('widget');
const data = require('self').data;
const timers = require("timers");
const Request = require("request").Request;

function refreshUnreadCount(worker) {
    var widgetAttached = true;
    function onDetach() {
        widgetAttached = false;
    }
    worker.on("detach", onDetach);

    // Put in Google Reader API request
    Request({
        url: "https://www.google.com/reader/api/0/unread-count?output=json",
        onComplete: function(response) {
            worker.removeListener("detach", onDetach);

            // Only update the widget if it's still attached.
            if (!widgetAttached)
                return;

            // Ignore response if we encountered a 404 (e.g. user isn't logged in)
            // or a different HTTP error.
            // TODO: Can I make this work when third-party cookies are disabled?
            if (response.status == 200) {
                monitorWidget.postMessage(response.json);
            } else {
                monitorWidget.postMessage(null);
            }
        }
    }).get();
}

var monitorWidget = widgets.Widget({
    // Mandatory widget ID string
    id: "greader-monitor",

    // A required string description of the widget used for
    // accessibility, title bars, and error reporting.
    label: "Google Reader Monitor",
    contentURL: data.url("widget.html"),
    contentScriptFile: [data.url("jquery-1.7.2.min.js"), data.url("widget.js")],

    onClick: function() {
        // Open Google Reader when the widget is clicked.
        tabs.open("https://www.google.com/reader/view/");
    },

    onAttach: function(worker) {
        // If the widget's inner width changes, reflect that in the GUI
        worker.port.on("widthReported", function(newWidth) {
            worker.width = newWidth;
        });

        var refreshTimer = timers.setInterval(refreshUnreadCount, 60000);

        // If the monitor widget is destroyed, make sure the timer gets cancelled.
        worker.on("detach", function() {
            timers.clearInterval(refreshTimer, worker);
        });

        refreshUnreadCount(worker);
    }
});