From 699a58e0b37ca50c9e20c630ba20b1ef97fba445 Mon Sep 17 00:00:00 2001
From: wmwragg <wm.wragg@gmail.com>
Date: Wed, 10 Aug 2016 11:39:10 +0100
Subject: [PATCH] Fix for historic and new undefined order issues

---
 src/components/structures/RoomSubList.js | 93 ++++++++++++++----------
 1 file changed, 56 insertions(+), 37 deletions(-)

diff --git a/src/components/structures/RoomSubList.js b/src/components/structures/RoomSubList.js
index 94a46d75bd..74ddb879a4 100644
--- a/src/components/structures/RoomSubList.js
+++ b/src/components/structures/RoomSubList.js
@@ -154,28 +154,21 @@ var RoomSubList = React.createClass({
     },
 
     // Generates the manual comparator using the given list
-    manualComparator: function(list) {
-        var self = this;
-        var roomList = list;
+    manualComparator: function(roomA, roomB) {
+        if (!roomA.tags[this.props.tagName] || !roomB.tags[this.props.tagName]) return 0;
 
-        return function(roomA, roomB) {
-            if (!roomA.tags[self.props.tagName] || !roomB.tags[self.props.tagName]) return 0;
+        // Make sure the room tag has an order element, if not set it to be the bottom
+        var a = roomA.tags[this.props.tagName].order;
+        var b = roomB.tags[this.props.tagName].order;
 
-            // Make sure the room tag has an order element, if not set it to be the bottom
-            var a = roomA.tags[self.props.tagName].order;
-            var b = roomB.tags[self.props.tagName].order;
-
-            if (a === undefined) {
-                a = (self._getHighestOrder(roomList) + 1.0) / 2.0;
-                roomA.tags[self.props.tagName].order = a;
-            };
-            if (b === undefined) {
-                b = (self._getHighestOrder(roomList) + 1.0) / 2.0;
-                roomB.tags[self.props.tagName].order = b;
-            };
-
-            return a == b ? self.lexicographicalComparator(roomA, roomB) : ( a > b  ? 1 : -1);
+        // Order undefined room tag orders to the bottom
+        if (a === undefined && b !== undefined) {
+            return 1;
+        } else if (a !== undefined && b === undefined) {
+            return -1;
         }
+
+        return a == b ? this.lexicographicalComparator(roomA, roomB) : ( a > b  ? 1 : -1);
     },
 
     sortList: function(list, order) {
@@ -183,30 +176,16 @@ var RoomSubList = React.createClass({
         if (order === undefined) order = this.props.order;
         var comparator;
         list = list || [];
-        if (order === "manual") comparator = this.manualComparator(list);
+        if (order === "manual") comparator = this.manualComparator;
         if (order === "recent") comparator = this.recentsComparator;
 
+        // Fix undefined orders here, and make sure the backend gets updated as well
+        this._fixUndefinedOrder(list);
+
         //if (debug) console.log("sorting list for sublist " + this.props.label + " with length " + list.length + ", this.props.list = " + this.props.list);
         this.setState({ sortedList: list.sort(comparator) });
     },
 
-    // Finds the highest (lowest position) order of a room in a manual ordered list
-    //     room.tag[tagname].order
-    _getHighestOrder: function(list) {
-        var order = 0.0;
-        if (this.props.order === "manual") {
-            var self = this;
-            list.forEach(function(room) {
-                if (room.tags.hasOwnProperty(self.props.tagName)) {
-                    if (order < room.tags[self.props.tagName].order) {
-                        order = room.tags[self.props.tagName].order;
-                    }
-                }
-            })
-        }
-        return order;
-    },
-
     moveRoomTile: function(room, atIndex) {
         if (debug) console.log("moveRoomTile: id " + room.roomId + ", atIndex " + atIndex);
         //console.log("moveRoomTile before: " + JSON.stringify(this.state.rooms));
@@ -351,6 +330,46 @@ var RoomSubList = React.createClass({
         this.props.onShowMoreRooms();
     },
 
+    // Fix any undefined order elements of a room in a manual ordered list
+    //     room.tag[tagname].order
+    _fixUndefinedOrder: function(list) {
+        if (this.props.order === "manual") {
+            var order = 0.0;
+            var self = this;
+
+            // Find the highest (lowest position) order of a room in a manual ordered list
+            list.forEach(function(room) {
+                if (room.tags.hasOwnProperty(self.props.tagName)) {
+                    if (order < room.tags[self.props.tagName].order) {
+                        order = room.tags[self.props.tagName].order;
+                    }
+                }
+            });
+
+            // Fix any undefined order elements of a room in a manual ordered list
+            // Do this one at a time, as each time a rooms tag data is updated the RoomList
+            // gets triggered and another list is passed in. Doing it one at a time means that
+            // we always correctly calculate the highest order for the list - stops multiple
+            // rooms getting the same order. This is only really relevant for the first time this
+            // is run with historical room tag data, after that there should only be undefined
+            // in the list at a time anyway.
+            for (let i = 0; i < list.length; i++) {
+                if (list[i].tags[self.props.tagName].order === undefined) {
+                    MatrixClientPeg.get().setRoomTag(list[i].roomId, self.props.tagName, {order: (order + 1.0) / 2.0}).finally(function() {
+                        // Do any final stuff here
+                    }).fail(function(err) {
+                        var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
+                        Modal.createDialog(ErrorDialog, {
+                            title: "Failed to add tag " + self.props.tagName + " to room",
+                            description: err.toString()
+                        });
+                    });
+                    break;
+                };
+            };
+        }
+    },
+
     render: function() {
         var connectDropTarget = this.props.connectDropTarget;
         var RoomDropTarget = sdk.getComponent('rooms.RoomDropTarget');