X-Git-Url: http://git.scottworley.com/reliable-chat/blobdiff_plain/705e26cf257d96a76dca724d8cd1c21b9f32d3f9..ac4bf273ffd4ff666af66d27b26ffef62d45c12c:/webclient/rc.html?ds=inline

diff --git a/webclient/rc.html b/webclient/rc.html
index 7517d14..e497135 100644
--- a/webclient/rc.html
+++ b/webclient/rc.html
@@ -82,8 +82,9 @@
 	var session = Math.random();  // For outgoing message IDs
 	var since = {};    // server -> time: For fetch?since=
 	var seen = {};     // seen_key -> message
+	var history = [];  // List of messages sorted by Time
 	// Messages have these fields:
-	//   Time: The server timestamp of the first copy to arrive 
+	//   Time: The timestamp.  Median of ServerTimes
 	//   ID: Some unique string for deduping
 	//   Text: The text of the message
 	//   ServerTimes: server -> timestamp
@@ -133,11 +134,31 @@
 	}
 
 	function rcaddmessagetohistory(message) {
-		message.UI = document.createElement("div");
-		var text = (message.Time ? rcformattime(message.Time) : "") + " " + message.Text;
-		message.UI.appendChild(document.createTextNode(text));
+		var message_i;
+		if (message.Time) {
+			for (var i = history.length - 1; ; i--) {
+				if (i < 0 || (history[i].Time && message.Time >= history[i].Time)) {
+					message_i = i+1;
+					history.splice(message_i, 0, message);
+					break;
+				}
+			}
+		} else {
+			history.push(message);
+			message_i = history.length-1;
+		}
+
+		if (!message.UI) {
+			var text = (message.Time ? rcformattime(message.Time) : "") + " " + message.Text;
+			message.UI = document.createElement("div");
+			message.UI.appendChild(document.createTextNode(text));
+		}
 		var h = document.getElementById("history");
-		h.appendChild(message.UI);
+		if (message_i + 1 < history.length) {
+			h.insertBefore(message.UI, history[message_i + 1].UI);
+		} else {
+			h.appendChild(message.UI);
+		}
 		window.scrollTo(0, document.body.scrollHeight);
 	}
 
@@ -145,6 +166,30 @@
 		return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
 	}
 
+	function rcupdatemessagetime(message) {
+		// Set message.Time to be the median of message.ServerTimes
+		var times = [];
+		for (var i in message.ServerTimes) {
+			times.push(message.ServerTimes[i]);
+		}
+		times.sort();
+		if (times.length % 2) {
+			message.Time = times[(times.length-1)/2];
+		} else {
+			var middle = times.length/2;
+			var difference = times[middle].getTime() - times[middle-1].getTime();
+			message.Time = new Date(times[middle-1].getTime() + difference/2);
+		}
+
+		// This may have broken history's in-sorted-order invariant
+		var hi = history.indexOf(message);
+		if ((history[hi-1] && history[hi-1].Time > message.Time) ||
+		    (history[hi+1] && history[hi+1].Time < message.Time)) {
+			history.splice(hi,1);
+			rcaddmessagetohistory(message);
+		}
+	}
+
 	function rcreceivemessages(server, messages) {
 		for (var i in messages) {
 			var m = messages[i];
@@ -152,8 +197,10 @@
 			var seen_key = make_seen_key(m.ID, m.Text);
 			if (seen_key in seen) {
 				seen[seen_key].ServerTimes[server] = m.Time;
+				rcupdatemessagetime(seen[seen_key]);
 			} else {
-				m.ServerTimes = {server: m.Time};
+				m.ServerTimes = {};
+				m.ServerTimes[server] = m.Time;
 				seen[seen_key] = m;
 				rcaddmessagetohistory(m);
 				for (var i in servers) {
@@ -205,11 +252,11 @@
 	}
 
 	function rcsend(d, message) {
-		var id = new Date().getTime() + "-" + session + "-" + Math.random();
-		seen[make_seen_key(id, message)] = message;
+		message.ID = new Date().getTime() + "-" + session + "-" + Math.random();
+		seen[make_seen_key(message.ID, message.Text)] = message;
 		var path = "/speak" +
-			"?id=" + encodeURIComponent(id) +
-			"&text=" + encodeURIComponent(message);
+			"?id=" + encodeURIComponent(message.ID) +
+			"&text=" + encodeURIComponent(message.Text);
 		for (var i in servers) {
 			var uri = rcserverbase(servers[i]) + path;
 			var img = document.createElement("img");
@@ -231,7 +278,7 @@
 			message = "<" + rcnick() + "> " + input;
 		}
 
-		var m = {'Text': message};
+		var m = {'Text': message, 'ServerTimes': {}};
 		rcaddmessagetohistory(m);
 		rcsend(m.UI, m);
 	}