var urls = new Array();

// this handles sequential loading, since first we need to process a document (to get the abstract), then
// get the Refer metadata, then process the next document, etc.
function getNext() {
	if(urls.length) {
		var url = urls.shift();
		Zotero.Utilities.processDocuments([url], function(doc) { scrape(doc); });
	} else {
		Zotero.done();
	}
}

function scrape(doc) {
	var onClick = doc.evaluate('//a[substring(text(), 5, 7) = "EndNote"]', doc, null, XPathResult.ANY_TYPE,
		null).iterateNext().getAttribute("onClick");
	var m = onClick.match(/'([^']+)'/);
	
	var abstract = doc.evaluate('//div[@class="abstract"]/p[@class="abstract"]', doc, null,
		XPathResult.ANY_TYPE, null).iterateNext();
	if(abstract) abstract = Zotero.Utilities.cleanString(abstract.textContent);
	
	var snapshot = doc.location.href;
	
	var attachments = new Array();
	var url;
	var typeLinks = doc.evaluate('//td[@class="smaller-text"]/a[img]', doc, null,
		XPathResult.ANY_TYPE, null);
	var typeLink;
	while(typeLink = typeLinks.iterateNext()) {
		var linkText = typeLink.textContent.toLowerCase();
		if(linkText == "pdf") {
			attachments.push({title:"ACM Full Text PDF", mimeType:"application/pdf", url:typeLink.href});
			url = typeLink.href;
		} else if(linkText == "html") {
			url = snapshot = typeLink.href;
		}
	}
	
	attachments.push({title:"ACM Snapshot", mimeType:"text/html", url:snapshot});

 	var doi;
 	var doiIter;
 	var doiList = doc.evaluate('//td[@class="small-text"]/a', doc, null, XPathResult.ANY_TYPE, null);
 	while (doiIter = doiList.iterateNext()) {
        var linkText = doiIter.textContent;
     	if (linkText.match(/doi\.acm\.org/)) {
	        doi = linkText.match(/doi\.acm\.org\/(.*)/)[1];
		}
 	}

	var keywords = new Array();
	var keywordLinks = doc.evaluate('//p[@class="keywords"]/a', doc, null,
		XPathResult.ANY_TYPE, null);
	var keywordLink;
	while(keywordLink = keywordLinks.iterateNext()) {
		keywords.push(Zotero.Utilities.trim(keywordLink.textContent.toLowerCase()));
	}
	
	Zotero.Utilities.HTTP.doGet("http://portal.acm.org/"+m[1], function(text) {
		// split() may no longer be necessary
		var m = text.split(/<\/?pre[^>]*>/ig);
		if (m[1]) {
			var text = m[1];
		}
   		
		// load Refer translator
		var translator = Zotero.loadTranslator("import");
		translator.setTranslator("881f60f2-0802-411a-9228-ce5f47b64c7d");
		translator.setString(text);
		translator.setHandler("itemDone", function(obj, item) {
			if(abstract) item.abstractNote = abstract;
			item.attachments = attachments;
			item.tags = keywords;
			item.type = undefined;
			item.DOI = doi;
			item.complete();
		});
		translator.translate();
		
		getNext();
	});
}

function doWeb(doc, url) {
	if(url.indexOf("/results.cfm") != -1) {
		var items = Zotero.Utilities.getItemArray(doc, doc, '^https?://[^/]+/citation.cfm\\?[^#]+$');
		
		items = Zotero.selectItems(items);
		if(!items) return true;
		
		for(var url in items) {
			urls.push(url);
		}
		
		getNext();
	} else {
		scrape(doc);
	}
	
	Zotero.wait();
}