var actLang = "cs";

var doc = document.querySelector("html");
if (doc && doc.hasAttribute("lang")) {
    actLang = doc.getAttribute("lang");
}

var baseurl = this.location.href;
var basedir = baseurl.substring(0, baseurl.lastIndexOf("/"));

var actSource = {
     url: "/script/data-web.qwarp",
     items: [],
     imageDir: "/pics/MA/"
 };

var items = [];

function init(evt) {
     
     loadSource(0, "readData");
}

function loadHTML(url, akce) {
    var http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/html');
            
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }
    if (!http_request) {
        console.log(strProblemXMLHTTP);
        return false;
    }


    http_request.onreadystatechange = function () {
        parseHTML(akce, http_request);
    };
      
    http_request.open('GET', url, true);
    http_request.send(); 
    
}

function parseHTML(akce, http_request) {
    if (akce == "readList") {
        var list = document.getElementById("itemList");
        list.innerHTML = "";
        
    }
    
    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
            var vystup = ""

        var response = http_request.responseText;
                   
   
        if (akce == "readData") {
                console.log("Data z osnovy nactena."); 
           
                parseIO(response);
                return;
            }
        
        } else {if (http_request.getAllResponseHeaders()) {console.log(strProblemRequest);}}
    }
    
}

function loadSource(index, action) {
   
    actSource.items = [];
    var path = "https://is.muni.cz/auth/elearning/warp?qurl=" + encodeURIComponent(basedir + actSource.url) + ";rozbalit_vse=1;prejit=;pro_tisk=1";
    console.log(path)
    
    loadHTML(path, action, actSource);
}

function parseIO (vstup) {
    
    chapters = [];
    vstup = vstup.substring(vstup.indexOf("<div id=\"osnova\">"), vstup.indexOf("<script type=\"text/javascript\" language=\"javascript\">ioInit();")-1)
   
    
    vstup = vstup.replace(/\n/g,"");
    
    actSource.items = [];   
        
    var lines = vstup.split("<div id=\"divid_");
        
    var itemIndex = -1;
    var lastId = "";
    
    for (var i = 1, len = lines.length; i < len; i++) {
        var line = lines[i];
       
        lastId = line.substring(0,line.indexOf("\"")); 
        var chunk = line.substring(line.indexOf(">")+1, line.indexOf("<"));
        chunk  = chunk.replace(/\n/g, "");
        chunk = chunk.replace(/\s+/g, " ");
        chunk = chunk.replace(/\&lt;/g, "<");
        chunk = chunk.replace(/\&gt;/g, ">");
            
        var item = null;

        
        actSource.items.push(lastId);
        
        
        
        try {   
            item = JSON.parse(chunk);
            item.id = lastId;

            console.log("Uspesne nactene " + item.id);
            
        }
        catch (se) {
            console.log("Spatne nacteny prvek");
            console.log(se.message)
            console.log(chunk)
            continue;
        }
       items.push(item);   
    }
    
    document.getElementById("intro").innerHTML = items[0][actLang];
}

window.addEventListener("load", init)