var upload_range = 1;
var get_status_speed;
var get_status_url;
var get_data_loop = false;
var seconds = 0;
var minutes = 0;
var hours = 0;
var info_width = 0;
var info_bytes = 0;
var info_time_width = 500;
var info_time_bytes = 15;
var cedric_progress_bar = 0;
var cedric_hold = true;
var total_upload_size = 0;
var check_file_name_format = 0;

// Make sure the user selected at least one file
function checkNullFileCount(){
	if(!check_null_file_count){ return false; }
  	
	var null_file_count = 0;
  	
	for(var i = 0; i < upload_range; i++){
		if(document.form_upload.elements['upfile_' + i].value == ""){ null_file_count++; }
	}
  	
	if(null_file_count == upload_range){
		alert("Prosim vyberte soubor ktery chcete ulozit.");
		return true;
	}
	else{ return false; }
}

// Make sure the user is not uploading duplicate files
function checkDuplicateFileCount(){
	if(!check_duplicate_file_count){ return false; }
  	
	var duplicate_flag = false;
	var file_count = 0;
	var duplicate_msg = "Nema smysl ukladat jeden soubor dvakrat.\n\n";
	var file_name_array = new Array();
        
	for(var i = 0; i < upload_range; i++){
		if(document.form_upload.elements['upfile_' + i].value != ""){
			var string = document.form_upload.elements['upfile_' + i].value;
			var num_of_last_slash = string.lastIndexOf("\\");

			if(num_of_last_slash < 1){ num_of_last_slash = string.lastIndexOf("/"); }

			var file_name = string.slice(num_of_last_slash + 1, string.length);
			            
			file_name_array[i] = file_name;
		}
	}
  	
	var num_files = file_name_array.length;
       
	for(var i = 0; i < num_files; i++){
		for(var j = 0; j < num_files; j++){
			if(file_name_array[i] == file_name_array[j] && file_name_array[i] != null){ file_count++; }
		}
		if(file_count > 1){
			duplicate_msg += 'Soubor "' + file_name_array[i] + '" je v radku ' + (i + 1) + ".\n";
			duplicate_flag = true;
		}
		file_count = 0;
	}
       
	if(duplicate_flag){ 
		alert(duplicate_msg);
		return true; 
	}
	else{ return false; }
}

// Handle user pressing 'Enter' in the upload slots
function handleKey(event){
        if(document.all){ if(window.event.keyCode == 13){ return false; } }
        else{ if(event && event.which == 13){ return false; } }
}

// Submit the upload form
function uploadFiles(){
	if(checkNullFileCount()){ return false; }
	if(checkDuplicateFileCount()){ return false; }
	
	var total_uploads = 0;
	
	for(var i = 0; i < upload_range; i++){
		if(document.form_upload.elements['upfile_' + i].value != ""){ total_uploads++; }
	}
	
	document.getElementById('total_uploads').innerHTML = total_uploads;
	document.form_upload.submit();
	document.getElementById('upload_button').disabled = true;
	
	iniProgressRequest();
	window.scroll(0,1500); 	
	for(var i = 0; i < upload_range; i++){ document.form_upload.elements['upfile_' + i].disabled = true; }	
}

// Reset the file upload page 
function resetForm(){ location.href = self.location; }

// Hide the progress bar
function hideProgressBar(){ document.getElementById('progress_bar').style.display = "none"; }

// Initialize the file upload page
function iniFilePage(){
	resetProgressBar();
	
	for(var i = 0; i < upload_range; i++){
		document.form_upload.elements['upfile_' + i].disabled = false;
		document.form_upload.elements['upfile_' + i].value = "";
	}
	
	document.getElementById('progress_info').innerHTML = "";
	document.getElementById('upload_button').disabled = false;
	document.getElementById('progress_bar').style.display = "none";
	document.form_upload.reset();
}

// Reset the progress bar
function resetProgressBar(){
	get_status_url = "";
	get_data_loop = false;
	seconds = 0;
	minutes = 0;
	hours = 0;
	info_width = 0;
	info_bytes = 0;
	cedric_hold = true;
	total_upload_size = 0;
	
	document.getElementById('upload_status').style.width = '0px';
	document.getElementById('percent').innerHTML = '0%';
	document.getElementById('uploaded_files').innerHTML = 0;
	document.getElementById('total_uploads').innerHTML = '';
	document.getElementById('current').innerHTML = 0;
	document.getElementById('total_kbytes').innerHTML = '';
	document.getElementById('time').innerHTML = 0;
	document.getElementById('remain').innerHTML = 0;
	document.getElementById('speed').innerHTML = 0;
}

// Stop the upload
function stopUpload(){
	try{ window.stop(); }
	catch(e){
		try{ document.execCommand('Stop'); }
		catch(e){} 
	}
}

// Add one upload slot
function addUploadSlot(num){
	if(upload_range < max_upload_slots){
		if(num == upload_range){
			var up = document.getElementById('upload_slots');
			var dv = document.createElement("div");
			
			dv.innerHTML = '<input type="file" name="upfile_' + upload_range + '" size="90" onChange="addUploadSlot('+(upload_range + 1)+')" onKeypress="return handleKey(event)">';
			up.appendChild(dv);
			upload_range++;
		}
	}
}

// Make the progress bar smooth
function smoothCedricStatus(){
	if(info_width < progress_bar_width && !cedric_hold){
		info_width++;
		document.getElementById('upload_status').style.width = info_width + 'px';
	}
	
	if(get_data_loop){ self.setTimeout("smoothCedricStatus()", info_time_width); }
}

// Make the bytes uploaded smooth
function smoothCedricBytes(){
	if(info_bytes < total_upload_size && !cedric_hold){
		info_bytes++;
		document.getElementById('current').innerHTML = info_bytes;
	}
	
	if(get_data_loop){ self.setTimeout("smoothCedricBytes()", info_time_bytes); }
}

// Get the progress of the upload
function getProgressStatus(){
	var jsel = document.createElement('SCRIPT');
	
	jsel.type = 'text/javascript';
	jsel.src = get_status_url + "&rnd_id=" + Math.random();
	
	document.body.appendChild(jsel);
	
	if(get_data_loop){ self.setTimeout("getProgressStatus()", get_status_speed); }
}

// Calculate and display upload stats
function setProgressStatus(bytes_read, lapsed_time, uploaded_files){
	var byte_speed = 0;
	var time_remaining = 0;
	
	if(lapsed_time > 0){ byte_speed = bytes_read / lapsed_time; }
	if(byte_speed > 0){ time_remaining = Math.round((total_upload_size - bytes_read) / byte_speed); }
	
	if(cedric_progress_bar == 1){
		if(byte_speed != 0){
			info_time_width = Math.round(total_upload_size * 1000 / (byte_speed * progress_bar_width));
			info_time_bytes = Math.round(1024000 / byte_speed);
		}
		else{
			info_time_width = 200;
			info_time_bytes = 15;
		}
	}
	
	// Calculate percent finished
	var percent_float = bytes_read / total_upload_size;
	var percent = Math.round(percent_float * 100);
	var progress_bar_status = Math.round(percent_float * progress_bar_width);
	
	// Calculate time remaining
	var remaining_sec = (time_remaining % 60); 
	var remaining_min = (((time_remaining - remaining_sec) % 3600) / 60);
	var remaining_hours = ((((time_remaining - remaining_sec) - (remaining_min * 60)) % 86400) / 3600);

	if(remaining_sec < 10){ remaining_sec = '0' + remaining_sec; }
	if(remaining_min < 10){ remaining_min = '0' + remaining_min; }
	if(remaining_hours < 10){ remaining_hours = '0' + remaining_hours; }

	var time_remaining_f = remaining_hours + ':' + remaining_min + ':' + remaining_sec; 
	
	byte_speed = Math.round(byte_speed / 1024);
	bytes_read = Math.round(bytes_read / 1024);
	
	if(cedric_progress_bar == 1){
		cedric_hold = false;
		info_width = progress_bar_status;
		info_bytes = bytes_read;
	}
	else{
		document.getElementById('upload_status').style.width = progress_bar_status + 'px';
		document.getElementById('current').innerHTML = bytes_read;
	}
	
	document.getElementById('percent').innerHTML = percent + '%';
	document.getElementById('uploaded_files').innerHTML = uploaded_files;
	document.getElementById('remain').innerHTML = time_remaining_f;
	document.getElementById('speed').innerHTML = byte_speed;
}


// Calculate the time spent uploading
function getElapsedTime(){
	seconds++;
    	
	if(seconds == 60){
		seconds = 0;
		minutes++;
	}
    	
	if(minutes == 60){
		minutes = 0;
		hours++;
	}
    	
	var hr = "" + ((hours < 10) ? "0" : "") + hours;
	var min = "" + ((minutes < 10) ? "0" : "") + minutes;
	var sec = "" + ((seconds < 10) ? "0" : "") + seconds;
    	
	document.getElementById('time').innerHTML = hr + ":" + min + ":" + sec;
    	
	if(get_data_loop){ self.setTimeout("getElapsedTime()", 1000); }
}

// Create the AJAX request
function createRequestObject(){
	var req = false;
  	
	if(window.XMLHttpRequest){
		req = new XMLHttpRequest();
		
		if(req.overrideMimeType){ req.overrideMimeType('text/xml'); }
	}
	else if(window.ActiveXObject){
		try{ req = new ActiveXObject("Msxml2.XMLHTTP"); }
		catch(e){
			try{ req = new ActiveXObject("Microsoft.XMLHTTP"); }
			catch(e){}
		}
	}
	
	if(!req){
		document.getElementById('progress_info').innerHTML = "Error: Your browser does not support AJAX";
		return false;
	}
	else{ return req; }
}

// Initialize the progress bar
function iniProgressRequest(){
	var req = false;
	req = createRequestObject();
	
	if(req){
		document.getElementById('progress_info').innerHTML = "Nacitam...";
		req.open("GET", path_to_ini_status_script + "&rnd_id=" + Math.random(), true);
		//req.open("GET",  + "http://img.uloz.to/&rnd_id=" + Math.random(), true);
		req.onreadystatechange = function(){ iniProgressResponse(req); };
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		req.send(null);
	}
}

// Initialize the progress bar
function iniProgressResponse(req){
	if(req.readyState == 4){
		if(req.status == 200){
			var xml = req.responseXML;
			
			if(xml.getElementsByTagName('error_status').item(0).firstChild.nodeValue == 1){
				document.getElementById('progress_info').innerHTML = xml.getElementsByTagName('error_msg').item(0).firstChild.nodeValue;
				
				if(xml.getElementsByTagName('stop_upload').item(0).firstChild.nodeValue == 1){ stopUpload(); }
			}
			else{
				get_status_speed = xml.getElementsByTagName('get_data_speed').item(0).firstChild.nodeValue;
				cedric_progress_bar = xml.getElementsByTagName('cedric_progress_bar').item(0).firstChild.nodeValue;
				total_upload_size = xml.getElementsByTagName('total_bytes').item(0).firstChild.nodeValue;
				get_status_url = "http://ul.uloz.to/upload_status.php?temp_dir_sid=" + xml.getElementsByTagName('temp_dir_sid').item(0).firstChild.nodeValue + "&start_time=" + xml.getElementsByTagName('start_time').item(0).firstChild.nodeValue + "&total_upload_size=" + xml.getElementsByTagName('total_bytes').item(0).firstChild.nodeValue;
				get_data_loop = true;
				
				if(document.form_upload.embedded_upload_results && document.form_upload.embedded_upload_results.value == 1){
					document.getElementById('upload_div').style.display = "none";
				}
				
				document.getElementById('progress_bar').style.display = "";
				document.getElementById('total_kbytes').innerHTML = Math.round(Number(xml.getElementsByTagName('total_bytes').item(0).firstChild.nodeValue / 1024)) + " ";
				document.getElementById('progress_info').innerHTML = "Uploading, wait please ...";
				
				getElapsedTime();
				getProgressStatus();
//			    window.scroll(0,50); 	
//			    window.scrollByLines(3);				
				if(xml.getElementsByTagName('cedric_progress_bar').item(0).firstChild.nodeValue == 1){
					smoothCedricBytes();
					smoothCedricStatus();
				}
			}
		}
		else{
			document.getElementById('progress_info').innerHTML = "Error: " + req.status + " " + req.statusText;
			//stopUpload();
		}
	}
}