fCraft.DrawCommands.BlockDBUndoConfirmCallback C# (CSharp) Method

        static void BlockDBUndoConfirmCallback([NotNull] Player player, [NotNull] object tag, bool fromConsole) {
            if (player == null) throw new ArgumentNullException("player");
            if (tag == null) throw new ArgumentNullException("tag");
            BlockDBUndoArgs args = (BlockDBUndoArgs)tag;
            string cmdName = (args.Area == null ? "UndoArea" : "UndoPlayer");
            if (args.Not) cmdName += "Not";

            // Produce 
            Vector3I[] coords;
            if (args.Area != null) {
                coords = new[] { args.Area.MinVertex, args.Area.MaxVertex };
            } else {
                coords = new Vector3I[0];
            }

            // Produce a brief param description for BlockDBDrawOperation
            string description;
            if (args.CountLimit > 0) {
                if (args.Targets.Length == 0) {
                    description = args.CountLimit.ToStringInvariant();
                } else if (args.Not) {
                    description = String.Format("{0} by everyone except {1}",
                                                args.CountLimit,
                                                args.Targets.JoinToString(p => p.Name));
                } else {
                    description = String.Format("{0} by {1}",
                                                args.CountLimit,
                                                args.Targets.JoinToString(p => p.Name));
                }
            } else {
                if (args.Targets.Length == 0) {
                    description = args.AgeLimit.ToMiniString();
                } else if (args.Not) {
                    description = String.Format("{0} by everyone except {1}",
                                                args.AgeLimit.ToMiniString(),
                                                args.Targets.JoinToString(p => p.Name));
                } else {
                    description = String.Format("{0} by {1}",
                                                args.AgeLimit.ToMiniString(),
                                                args.Targets.JoinToString(p => p.Name));
                }
            }

            // start undoing (using DrawOperation infrastructure)
            var op = new BlockDBDrawOperation(player, cmdName, description, coords.Length);
            op.Prepare(coords, args.Entries);

            // log operation
            string targetList;
            if (args.Targets.Length == 0) {
                targetList = "(everyone)";
            } else if (args.Not) {
                targetList = "(everyone) except " + args.Targets.JoinToClassyString();
            } else {
                targetList = args.Targets.JoinToClassyString();
            }
            Logger.Log(LogType.UserActivity,
                       "{0}: Player {1} will undo {2} changes (limit of {3}) by {4} on world {5}",
                       cmdName,
                       player.Name,
                       args.Entries.Length,
                       args.CountLimit == 0 ? args.AgeLimit.ToMiniString() : args.CountLimit.ToStringInvariant(),
                       targetList,
                       args.World.Name);

            op.Begin();
        }