/* Create Namespace */
if (!window.Paperlit) { window.Paperlit = {}; }
// if issueId or pageNumber are specified on hash, use them (this let direct urls work, e.g.: for sharing)
Paperlit.windowHash = location.hash.substring(1, location.hash.length).split("/");
// Set reader general parameters
Paperlit.publicationId = 'ilfoglio';
Paperlit.mainPublicationId = Paperlit.publicationId;
Paperlit.issueId = '';
Paperlit.pageNumber = '1';
Paperlit.readerUrl = 'http://www.paperlit.com';
Paperlit.originHost = location.protocol + "//" + location.host;
// Add iframe css
Paperlit.head = document.getElementsByTagName("head")[0];
Paperlit.embedCss = document.createElement('link');
Paperlit.embedCss.type = "text/css";
Paperlit.embedCss.rel = "stylesheet";
Paperlit.embedCss.href = Paperlit.readerUrl + "/site/reader/css/embed.css";
Paperlit.head.appendChild(Paperlit.embedCss);
// Add jQuery if not loaded (necessary for width() and height function() )
if (typeof jQuery == "undefined")
	document.write('<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></scr' + 'ipt>');
// Hash is used to display publication, issue, pageNumber
// e.g.: #publicationId/issueId/pageNumber
//       #mainPublicationId/publicationId/issueId/pageNumber (in case of newsstand, multipublication)
Paperlit.updateHash = function() {
	location.hash = (Paperlit.mainPublicationId == Paperlit.publicationId) ? 
		Paperlit.publicationId + "/" + Paperlit.issueId + "/" + Paperlit.pageNumber : 
		Paperlit.mainPublicationId + "/" + Paperlit.publicationId + "/" + Paperlit.issueId + "/" + Paperlit.pageNumber;
}
// update hash to reflect page change event
Paperlit.changePageNumber = function(value) {
	var issueId = value.split(";")[0];
	var pageNumber = value.split(";")[1];
	Paperlit.issueId = issueId;
	Paperlit.pageNumber = pageNumber;
	Paperlit.updateHash();
}
// when reader is loaded, update document title with publication name
Paperlit.setDocumentTitle = function(title) {
	document.title = title;
}
// update publication id (if newsstand)
Paperlit.setPublicationId = function(publicationId) {
	Paperlit.publicationId = publicationId;
	Paperlit.updateHash();
}
Paperlit.authorizationError = function() {
	alert("Invalid Url");
	document.location.href = document.location.origin;
};
window.onmessage = function(evt) {
	if (evt.origin == Paperlit.readerUrl) {
		// evt data pattern: action:value
		var action = evt.data.split(":")[0];
		var value = evt.data.split(":")[1];
		switch (action) {
			case "changePageNumber":
				Paperlit.changePageNumber(value);
				// Every time return URL for share
				document.getElementById("ppIframe").contentWindow.postMessage("urlForShare:" + encodeURIComponent(document.location.href), Paperlit.readerUrl);
				break;
			case "setDocumentTitle":
				Paperlit.setDocumentTitle(value);
				break;
			case "setPublicationId":
				Paperlit.setPublicationId(value);
				break;
			default:
				break;
		}
	}
};
window.onload = function(evt) {
	// No hash set: use GET parameter to build reader
	Paperlit.publicationId = (Paperlit.windowHash[0] == "") ? // windowHash[0] is never undefined
		Paperlit.publicationId : 
		Paperlit.windowHash[0];
	Paperlit.mainPublicationId = Paperlit.publicationId;
	if (Paperlit.windowHash[1] !== undefined){
		if (Paperlit.windowHash[1].match(/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/)) {
  			Paperlit.issueId = Paperlit.windowHash[1];
		} else {
  			Paperlit.publicationId = Paperlit.windowHash[1];
		}
	}
	if (Paperlit.windowHash[2] !== undefined) {
		if (Paperlit.windowHash[2].match(/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/))
			Paperlit.issueId = Paperlit.windowHash[2];
		else
			Paperlit.pageNumber = Paperlit.windowHash[2].match(/(\d+)/) != null ? Paperlit.windowHash[2] : 1;
	}
	if (Paperlit.windowHash[3] !== undefined && Paperlit.windowHash[3].match(/(\d+)/) != null)
		Paperlit.pageNumber = Paperlit.windowHash[3];
	// Check if mainPublicationId is invalid (forced)
	if (Paperlit.mainPublicationId != "ilfoglio") {
		Paperlit.authorizationError();
	}
	var readerBaseUrl = Paperlit.readerUrl + "/php/site/reader?p=" + Paperlit.mainPublicationId + "&e=1#/";
	var readerHash = (Paperlit.publicationId != Paperlit.mainPublicationId) ? 
		Paperlit.mainPublicationId + "/" + Paperlit.publicationId + "/" + Paperlit.issueId + "?page=" + Paperlit.pageNumber + "&host=" + Paperlit.originHost : 
		Paperlit.publicationId + "/" + Paperlit.issueId + "?page=" + Paperlit.pageNumber + "&host=" + Paperlit.originHost;
	var iframeElement = document.createElement("iframe");
	iframeElement.id = "ppIframe";
	iframeElement.src = readerBaseUrl + readerHash;
	iframeElement.scrolling = "no"; // Very important: without it Safari does not change properly iframe dimensions
	document.getElementById("pp-reader-wrapper").appendChild(iframeElement);
}
/* There is a bug (Safary) that prevent iframe resize event propagation to its content resizing when orientation change 
 * Force resizing changing iframe wrapper dimension
 */
if (navigator.userAgent.match(/iPad/i) !== null) {
	window.onresize = function() {
		var wrapperWidth = $("#pp-reader-wrapper").width();
		var wrapperHeight = $("#pp-reader-wrapper").height();
		var windowWidth = $(window).width();
		var windowHeight = $(window).height();
		$("#ppIframe").width(wrapperWidth);
		$("#ppIframe").height(wrapperHeight);
	}
}