// these vars will be set by the calling page
var hasConfig = false;
var wUrl = null;
var appRegId = null;
var pnCode = null;
var insertWidgetScriptUrl = null;
var channel = null;
var baseTrackerUrl = null;
var galleryCdnUrl = null;

// these vars are local
var head = document.getElementsByTagName('head').item(0);
var appId = null;
var owner = null;
var viewer = null;
var firstView = false;
var prefs = gadgets.views.getParams();
if(prefs["mode"]=="edit"){
    firstView = true;
}

var resizeOpenSocialGadget = function(height){
     if(gadgets.window){
        gadgets.window.adjustHeight(height);
    }
};

function init() {
	var dataRequest = opensocial.newDataRequest();
	dataRequest.add(dataRequest.newFetchPersonRequest(opensocial.DataRequest.PersonId.OWNER), 'owner');
	dataRequest.add(dataRequest.newFetchPersonRequest(opensocial.DataRequest.PersonId.VIEWER), 'viewer');
	dataRequest.add(dataRequest.newFetchPersonAppDataRequest(opensocial.DataRequest.PersonId.OWNER, 'appId'), 'appId');
	dataRequest.send(loadData);
}

function loadData(response) {
	var ownerData = response.get('owner');

	if (response.hadError() || ownerData.hadError()) {
		return;
	}

	owner = ownerData.getData();

	var viewerData = response.get('viewer');

	if (viewerData.hadError()) {
		return;
	}

	viewer = viewerData.getData();

	var appData = response.get('appId');

	if (response.hadError() || appData.hadError()) {
		return;
	}

	var allAppData = appData.getData();

	if (allAppData[owner.getId()]) {
		appId = allAppData[owner.getId()]['appId'];
	}

	if ((!appId || appId == 'false') && (viewer.getId() == owner.getId())) {
		doInstall();
	} else {
		loadMain();
	}
}

function doInstall() {
	var installScript = document.createElement('script');
    installScript.setAttribute('src', wUrl + '/OpenSocialInstall.js?regId=' + appRegId + '&pn=' + pnCode + '&ownerId=' + escape(owner.getId()) + '&callback=handleInstall');
	head.appendChild(installScript);
}

function handleInstall(response) {
	if (response.appId) {
		appId = response.appId;
		var req = opensocial.newDataRequest();
		req.add(req.newUpdatePersonAppDataRequest(opensocial.DataRequest.PersonId.VIEWER, 'appId', appId));
		req.send();
		firstView = true;
	}

	if (appId == null) {
		return;
	}

	loadMain();
}

function loadMain() {
	var insertWidgetScript = document.createElement('script');
	insertWidgetScript.setAttribute('src', insertWidgetScriptUrl);
	insertWidgetScript.setAttribute('id', 'widgetbox_insertwidget_script');
	insertWidgetScript.type = 'text/javascript';
	head.appendChild(insertWidgetScript);

	var iframe = document.getElementById('snapp-iframe');
    iframe.setAttribute('src', wUrl + '/integration/socialapp_subscription.jsp?osHelperChannel=' + channel + '&appInstId=' + appId + '&ownerId=' + escape(owner.getId()));

	if (!window.WIDGETBOX) {
		if (!window.WIDGETBOXINITLISTENERS) window.WIDGETBOXINITLISTENERS = new Array();
		window.WIDGETBOXINITLISTENERS.push(loadHandler);
	} else {
		loadHandler();
	}
}

function loadHandler() {
	WIDGETBOX.load('opensocial.snapp', libReadyCallback);
}

function libReadyCallback() {
	WIDGETBOX.subscriber.WbxSnapp.appInstId = appId;
	WIDGETBOX.subscriber.WbxSnapp.ownerId = owner.getId();
    WIDGETBOX.subscriber.WbxSnapp.isOwner = (viewer.getId() == owner.getId());
    WIDGETBOX.subscriber.WbxSnapp.hasConfig = hasConfig;
    WIDGETBOX.subscriber.WbxSnapp.openSocialView = "canvas";
    WIDGETBOX.subscriber.WbxSnapp.resizeOpenSocialGadget = resizeOpenSocialGadget;

    var supported_views = gadgets.views.getSupportedViews();
    WIDGETBOX.subscriber.WbxSnapp.supportsPreview = (supported_views["preview"])?true:false;

    if (firstView || prefs["edit"]=='true') {
        if(firstView) WIDGETBOX.subscriber.WbxSnapp.addCookieSwf(runtimeCdnUrl, appId);
        if(hasConfig){
            WIDGETBOX.subscriber.WbxSnapp.showSettings();
        } else {
            WIDGETBOX.subscriber.WbxSnapp.hideSettings();
        }
    } else {
		WIDGETBOX.subscriber.WbxSnapp.hideSettings();
    }
}

function navigateToAddPage(){
    if(WIDGETBOX.subscriber.WbxSnapp.supportsPreview){
        gadgets.views.requestNavigateTo(supported_views["preview"]);
    }
}