/*
 * http://www.obalkyknih.cz
 *
 * API Functions
 *
 * (c)2009 Martin Sarfy <martin@sarfy.cz>
 */

var obalky = obalky || {};

obalky.protocol = 
	(document.location.protocol == 'https:') ? 'https://':'http://';
obalky.url = obalky.protocol+"www.obalkyknih.cz";

obalky.books = obalky.books || [];
obalky.version = "0.2.0";
obalky.id = 0;
obalky.msie = navigator.userAgent.indexOf("MSIE") != -1 ? 1 : 0;

obalky.callback = obalky.callback || function (books) {
	for(var i=0;i<books.length;i++) {
		for(var j=0;j<books[i]["callbacks"].length;j++) {
			callback = books[i]["callbacks"][j];
			var element = document.getElementById(callback["id"]);
			var function_pointer = eval(callback["name"]);
			if(function_pointer) function_pointer(element,books[i]);
		}
	}
};

obalky.download = obalky.download || function (books) {
	var obalky_json = "obalky_json_"+obalky.id++;
	var jsonScript = document.getElementById(obalky_json);
	if (jsonScript) jsonScript.parentNode.removeChild(jsonScript);
	var scriptElement = document.createElement("script");
	scriptElement.setAttribute("id", obalky_json);
	scriptElement.setAttribute("type", "text/javascript");
	scriptElement.setAttribute("src", obalky.url+"/api/books?books="+
		encodeURIComponent(JSON.stringify(books)));
	document.documentElement.firstChild.appendChild(scriptElement);
};

obalky.findFirstNodeByClass = function (startNode, className) {
	if(!(startNode.nodeType === 1)) return null; // skip non-elements
	if(startNode.className == className) return startNode;
	var childs = startNode.childNodes;
	for(var i=0;i<childs.length;i++) {
		var found = obalky.findFirstNodeByClass(childs[i], className);
		if(found) return found;
	}
	return null;
};

obalky.findNodesByClass = function (startNode, className) {
	var nodes = (startNode.className == className) ? [ startNode ] : [];
	var childs = startNode.childNodes;
	for(var i=0;i<childs.length;i++)
		nodes = nodes.concat(obalky.findNodesByClass(childs[i], className));
	return nodes;
};
obalky.getValue = function (startNode, className) {
	var el = obalky.findFirstNodeByClass(startNode, className);
	return el ? (el.textContent ? el.textContent : el.innerHTML ) : undefined;
};
obalky.onload = function() {
	var id = 0;
	var book_els = obalky.findNodesByClass(document.body,"obalky_book");
	var books = [];
	for(var i=0;i<book_els.length;i++) {
		var book = book_els[i];
		// nacti permalink
		var permalink = obalky.getValue(book,"obalky_permalink");
	    var el = obalky.findFirstNodeByClass(book, "obalky_permalink");
		if(!permalink) continue;	

		var info = obalky.findFirstNodeByClass(book,"obalky_bibinfo");
		if(!info) continue;

		// nacti ostatni...
		var bibinfo = {};
		bibinfo["isbn"] = obalky.getValue(info,"obalky_isbn");
		bibinfo["issn"] = obalky.getValue(info,"obalky_issn");
		bibinfo["cnb"]  = obalky.getValue(info,"obalky_cnb"); // 924658
		bibinfo["ean"]  = obalky.getValue(info,"obalky_ean"); // 1121121

		// zkontroluj povinna metadata?

		var callback_els = obalky.findNodesByClass(book,"obalky_callback");
		var calls = [];
		for(var j=0;j<callback_els.length;j++) {
			var callback = callback_els[j];
			callback.id = callback.id ? callback.id : "obalky_callback_"+(++id);
			calls.push(	{ "name": callback.getAttribute("name"), 
						  "id": callback.id });
		}
		books.push( { "permalink": permalink, "bibinfo": bibinfo, 
		              "callbacks": calls } );
		if(obalky.msie || books.length > 10) {
			obalky.download(books);
			books = []; 
		}
	}
	if(!obalky.msie) obalky.download(books);
};
obalky.process = function(callback_name, element_id, permalink, bibinfo) {
	var books = [ { "permalink" : permalink, "bibinfo": bibinfo, 
			"callbacks": [ { "name": callback_name, "id": element_id } ] } ];
	obalky.download(books);
}
/*obalky.previous_onload = window.onload; // IE way...
window.onload = function() {
	if(obalky.previous_onload) obalky.previous_onload();
	obalky.onload();
	if(obalky_custom_onload) obalky_custom_onload();
};*/
/*document.addEventListener("load", function(event) { obalky.onload(); }, false);*/


/*
   if (document.addEventListener) {
       document.addEventListener("DOMContentLoaded", obalky.onload, false);
   } else if (window.attachEvent) {
		 window.attachEvent("onload", obalky.onload); 
	}
*/


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if(!this.JSON){this.JSON={};}
(function(){function f(n){return n<10?'0'+n:n;}
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f(this.getUTCMonth()+1)+'-'+
f(this.getUTCDate())+'T'+
f(this.getUTCHours())+':'+
f(this.getUTCMinutes())+':'+
f(this.getUTCSeconds())+'Z':null;};String.prototype.toJSON=Number.prototype.toJSON=Boolean.prototype.toJSON=function(key){return this.valueOf();};}
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throw new SyntaxError('JSON.parse');};}}());
/* ------------------------------------------------------------------------- */
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