<?xml version = "1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"DTD/xhtml1-strict.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
<meta charset="UTF-8">

<head>
	<title>NDN Get File via WebSocket</title>
	
	<script type="text/javascript" src="../tools/build/ndn-js.js"></script>

	<script type="text/javascript">
		//hostip = "131.179.196.232";
		hostip = "localhost";
		var ndncon = new NDN({port:9696,host:hostip});
        ndncon.transport.connectWebSocket(ndncon);
        
///////////////////////////////////////////////////////////////////////////////////////////////////////////
        /*
		 * Closure for calling expressInterest to fetch big file.
		 */                                                
		var ContentClosure = function ContentClosure(ndn, T0) {
		    // Inherit from Closure.
		    Closure.call(this);
		    
		    this.T0 = T0;
		    this.ndn = ndn;
			this.totalBlocks = 0;
		    
		    this.firstReceivedSegmentNumber = null;
		    this.firstReceivedContentObject = null;
		}
		
		ContentClosure.prototype.upcall = function(kind, upcallInfo) {
		    if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {
		    	var T1 = new Date();
		    	document.getElementById('content').innerHTML += "<p>Interest time out.</p>";
		        document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms including 4s timeout</p>";
		        document.getElementById('content').innerHTML += "<p>Total number of blocks: " + this.totalBlocks + "</p>";
		        return Closure.RESULT_OK;
		    }
		    
		    if (kind == Closure.UPCALL_CONTENT_BAD) {
		    	console.log("NdnProtocol.ContentClosure: signature verification failed");
		    	return Closure.RESULT_OK;
		    }
		    
		    if (!(kind == Closure.UPCALL_CONTENT ||
		          kind == Closure.UPCALL_CONTENT_UNVERIFIED))
		        // The upcall is not for us.
		        return Closure.RESULT_ERR;
		    
		    var contentObject = upcallInfo.contentObject;
		    if (contentObject.content == null) {
		        console.log("NdnProtocol.ContentClosure: contentObject.content is null");
		        return Closure.RESULT_ERR;
		    }
		
		    // Use the segmentNumber to load multiple segments.
		    //var segmentNumber = ArrayToNum(contentObject.name.components[contentObject.name.components.length - 1]);
		    var segmentNumber = DataUtils.bigEndianToUnsignedInt
		    						(contentObject.name.components[contentObject.name.components.length - 1]);
		    //console.log(segmentNumber);
		    
	        if (this.firstReceivedSegmentNumber == null) {
	            // This is the first call.
	            this.firstReceivedSegmentNumber = segmentNumber;
	            if (segmentNumber != 0) {
	                // Special case: Save this content object for later and request segment zero.
	                this.firstReceivedContentObject = contentObject;
	                var componentsForZero = contentObject.name.components.slice
	                    (0, contentObject.name.components.length - 1);
	                componentsForZero.push([0]);
	                this.ndn.expressInterest(new Name(componentsForZero), this);
	                return Closure.RESULT_OK;
	            }
	        }
		    
		    // Process received data here...
		    // Count content length
		    //nameStr = escape(contentObject.name.getName());
			//document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
			//document.getElementById('content').innerHTML += "<p>Content buffer length: " + contentObject.content.length + "</p>";
			this.totalBlocks++;
		    
		    // Check for the special case if the saved content is for the next segment that we need.
		    if (this.firstReceivedContentObject != null && 
		        this.firstReceivedSegmentNumber == segmentNumber + 1) {
		        // Substitute the saved contentObject send its content and keep going.
		        contentObject = this.firstReceivedContentObject;
		        segmentNumber = segmentNumber + 1;
		        // Clear firstReceivedContentObject to save memory.
		        this.firstReceivedContentObject = null;
		        
		        // Process received data here...
		    	// Count content length
		    	//nameStr = escape(contentObject.name.getName());
				//document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
				//document.getElementById('content').innerHTML += "<p>Content buffer length: " + contentObject.content.length + "</p>";
				this.totalBlocks++;
		    }
		
		    var finalSegmentNumber = null;
		    if (contentObject.signedInfo != null && contentObject.signedInfo.finalBlockID != null)
		        //finalSegmentNumber = ArrayToNum(contentObject.signedInfo.finalBlockID);
		        finalSegmentNumber = DataUtils.bigEndianToUnsignedInt(contentObject.signedInfo.finalBlockID);
		    
		    if (finalSegmentNumber == null || segmentNumber != finalSegmentNumber) {
		        // Make a name for the next segment and get it.
		        //var segmentNumberPlus1 = NumToArray(segmentNumber + 1);
		        // Make a name for the next segment and get it.
		        var segmentNumberPlus1 = DataUtils.nonNegativeIntToBigEndian(segmentNumber + 1);
		        // Put a 0 byte in front.
		        var nextSegmentNumber = new Uint8Array(segmentNumberPlus1.length + 1);
		        nextSegmentNumber.set(segmentNumberPlus1, 1);
        		
		        var components = contentObject.name.components.slice
		            (0, contentObject.name.components.length - 1);
		        components.push(nextSegmentNumber);
		        //components.push(segmentNumberPlus1);
		        this.ndn.expressInterest(new Name(components), this);
		    }
		    else {
		        // Final block received.
		        // Record stop time
		        var T1 = new Date();
		        document.getElementById('content').innerHTML += "<p>Final block received.</p>";
		        document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms</p>";
		        document.getElementById('content').innerHTML += "<p>Total number of blocks: " + this.totalBlocks + "</p>";
		    }
		        
		    return Closure.RESULT_OK;
		};
		
		/*
		 * Convert the big endian Uint8Array to an unsigned int.
		 * Don't check for overflow.
		 */
		function ArrayToNum(bytes) {
		    var result = 0;
		    for (var i = 0; i < bytes.length; ++i) {
		        result = result * 10;
		        result += (bytes[i] - 48);
		    }
		    return result;
		};
		
		/*
		 * Convert the int value to a new big endian Uint8Array and return.
		 * If value is 0 or negative, return Uint8Array(0). 
		 */
		function NumToArray(value) {
		    value = Math.round(value);
		    if (value <= 0)
		        return new Uint8Array(0);
		    
		    numString = value.toString();
		    var size = numString.length;
		    var result = new Uint8Array(size);
		    for (i = 0; i < size; i++) {
		    	result[i] = numString.charCodeAt(i);
		    }
		    return result;
		};
///////////////////////////////////////////////////////////////////////////////////////////////////////////
        
        /*
        var AsyncGetClosure = function AsyncGetClosure(T0) {
        	this.T0 = T0;  // Start time
        	// Inherit from Closure.
			Closure.call(this);
		};
		
		AsyncGetClosure.prototype.upcall = function(kind, upcallInfo) {
			//console.log("Closure.upcall() executed.");
			if (kind == Closure.UPCALL_FINAL) {
				// Do nothing.
			} else if (kind == Closure.UPCALL_CONTENT) {
				var T1 = new Date();
				
				var content = upcallInfo.contentObject;
				nameStr = escape(content.name.getName());
				document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms</p>"; 
				document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
				document.getElementById('content').innerHTML += "<p>Content buffer length: " + content.content.length + "</p>";
				//console.log("In callback, nameStr: " + nameStr);
				//console.log("In callback, content: ");
				//console.log(content.content.length);
				//document.getElementById('content').innerHTML += contentObjectToHtml(content);
			} else if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {
				console.log("Closure.upcall called with interest time out.");
			}
			return Closure.RESULT_OK;
		};
		*/
		
		function run() {
			document.getElementById('content').innerHTML += "<p>Started...</p>";
			//ndn.expressInterest(new Name(document.getElementById('interest').value), new AsyncGetClosure( new Date() ));
			var name = new Name(document.getElementById('interest').value);
            ndncon.expressInterest( name, 
                    new ContentClosure( ndncon, new Date() ));
		}
		
	</script>
	
</head>
<body >

	<form>
		Please Enter an Interest:<br />
		<input id="interest" type="text" name="INTEREST" size="50" value="/wentao.shang/choir_jail.png" /> 
	</form>

	<button onclick="run()">Fetch Content</button>
	
	<p id="content">Result: <br/></p>

</body>
</html>