Even more changes

DeukBot4/MessageHandlers/Attributes/RequireParameterMatchAttribute.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace DeukBot4.MessageHandlers
+{
+    [AttributeUsage(AttributeTargets.Method)]
+    public class RequireParameterMatchAttribute : Attribute
+    {
+
+    }
+}

DeukBot4/MessageHandlers/CommandHandler/Command.cs

@@ -1,16 +1,17 @@
-using System.Diagnostics;
+using System.Reflection;
-using System.Reflection;
 using System.Threading.Tasks;
 using DeukBot4.MessageHandlers.CommandHandler.RequestStructure;
 using DeukBot4.MessageHandlers.Permissions;
-using Discord.WebSocket;
 
 namespace DeukBot4.MessageHandlers.CommandHandler
 {
     public class Command
     {
-        public Command(string name, PermissionLevel permission, string shortHelp, string longHelp, bool forbidInPm,
+        public Command(string                  name, PermissionLevel permission, string shortHelp,
-            ParameterMatcher.ParameterType[][] parameterTypes, MethodInfo function, CommandContainerBase commandContainer)
+            string                             longHelp,
+            ParameterMatcher.ParameterType[][] parameterTypes, bool forbidInPm, bool requireParameterMatch,
+            MethodInfo                         function,
+            CommandContainerBase               commandContainer)
         {
             Name                  = name;
             Permission            = permission;
@@ -21,9 +22,12 @@ namespace DeukBot4.MessageHandlers.CommandHandler
             ParameterTypes        = parameterTypes;
             HasHelp               = true;
             ForbidInPm            = forbidInPm;
+            RequireParameterMatch = requireParameterMatch;
         }
 
-        public Command(string name, PermissionLevel permission, ParameterMatcher.ParameterType[][] parameterTypes, bool forbidInPm,
+        public Command(string                  name, PermissionLevel permission,
+            ParameterMatcher.ParameterType[][] parameterTypes,
+            bool                               forbidInPm, bool                 requireParameterMatch,
             MethodInfo                         function,   CommandContainerBase commandContainer)
         {
             Name                  = name;
@@ -33,6 +37,7 @@ namespace DeukBot4.MessageHandlers.CommandHandler
             ParameterTypes        = parameterTypes;
             HasHelp               = false;
             ForbidInPm            = forbidInPm;
+            RequireParameterMatch = requireParameterMatch;
         }
 
         public string                             Name                  { get; }
@@ -44,6 +49,7 @@ namespace DeukBot4.MessageHandlers.CommandHandler
         public bool                               HasHelp               { get; }
         public ParameterMatcher.ParameterType[][] ParameterTypes        { get; }
         public bool                               ForbidInPm            { get; }
+        public bool                               RequireParameterMatch { get; }
 
         private string[] _parameterMatchers;
 

DeukBot4/MessageHandlers/CommandHandler/CommandContainerBase.cs

@@ -17,37 +17,44 @@ namespace DeukBot4.MessageHandlers.CommandHandler
 
             foreach (var methodInfo in funcs)
             {
+                // grab all command attributes, cast them properly
                 var commandAttributes = methodInfo.GetCustomAttributes(typeof(CommandAttribute), true)
                     .Select(x => x as CommandAttribute);
 
+                // get the help attribute if it exists
                 CommandHelpAttribute helpAttribute = null;
                 var helpAttributes = methodInfo.GetCustomAttributes(typeof(CommandHelpAttribute), true)
-                    .Select(x => x as CommandHelpAttribute);
+                    .Select(x => x as CommandHelpAttribute).ToArray();
-                var commandHelpAttributes = helpAttributes as CommandHelpAttribute[] ?? helpAttributes.ToArray();
+                if (helpAttributes.Any())
-                if (commandHelpAttributes.Any())
+                    helpAttribute = helpAttributes[0];
-                    helpAttribute = commandHelpAttributes[0];
 
-                var parametersAttributes = methodInfo.GetCustomAttributes(typeof(CommandParametersAttribute), true)
-                    .Select(x => x as CommandParametersAttribute);
-                var commandParametersAttributes = parametersAttributes as CommandParametersAttribute[] ??
-                                                  parametersAttributes.ToArray();
-                var parameters = commandParametersAttributes.Select(x => x.Types).ToArray();
 
+                // grab all of the potential parameter type arrays
+                var parameters = methodInfo.GetCustomAttributes(typeof(CommandParametersAttribute), true)
+                    .Select(x => (CommandParametersAttribute) x)
+                    .Select(x => x.Types.ToArray())
+                    .ToArray();
+
+                // check if the function has the attribute for blocking usage in PMs
                 var forbidPm = methodInfo.GetCustomAttributes(typeof(BlockUsageInPmAttribute), true).Any();
 
+                var matchParametersExactly =
+                    methodInfo.GetCustomAttributes(typeof(RequireParameterMatchAttribute), true).Any();
+
                 foreach (var commandAttribute in commandAttributes)
                 {
                     if (commandAttribute == null)
                         continue;
                     if (helpAttribute == null)
                     {
-                        commands.Add(new Command(commandAttribute.Command, commandAttribute.Permission, parameters, forbidPm,
+                        commands.Add(new Command(commandAttribute.Command, commandAttribute.Permission, parameters,
-                            methodInfo, this));
+                            forbidPm, matchParametersExactly, methodInfo, this));
                     }
                     else
                     {
                         commands.Add(new Command(commandAttribute.Command, commandAttribute.Permission,
-                            helpAttribute.ShortHelp, helpAttribute.LongHelp, forbidPm, parameters, methodInfo, this));
+                            helpAttribute.ShortHelp, helpAttribute.LongHelp, parameters, forbidPm,
+                            matchParametersExactly, methodInfo, this));
 
                     }
                 }

DeukBot4/MessageHandlers/CommandHandler/CommandHandler.cs

@@ -13,8 +13,8 @@ namespace DeukBot4.MessageHandlers.CommandHandler
 {
     public static class CommandHandler
     {
-        public static Dictionary<string, Command> Commands { get; private set; } = new Dictionary<string, Command>();
+        public static Dictionary<string, Command> Commands { get; } = new Dictionary<string, Command>();
-        public const char CommandTrigger = '!';
+        private const char CommandTrigger = '!';
 
         public static void Build()
         {
@@ -31,7 +31,8 @@ namespace DeukBot4.MessageHandlers.CommandHandler
                     Commands.Add(command.Name.ToLowerInvariant(), command);
                 }
 
-                Logger.Log($"Loaded following commands for container {obj.Name}: {commands.Select(x => x.Name).Join(", ")}");
+                Logger.Log(
+                    $"Loaded following commands for container {obj.Name}: {commands.Select(x => x.Name).Join(", ")}");
 
             }
 
@@ -42,34 +43,54 @@ namespace DeukBot4.MessageHandlers.CommandHandler
             if (string.IsNullOrWhiteSpace(message.Content))
                 return;
 
-            if (message.Content[0] != CommandTrigger) return;
+            if (message.Content[0] != CommandTrigger)
+                return;
+
             var req = await CommandRequest.Create(message);
             var resultCode = req.Item2;
-            if (resultCode == CommandRequest.RequestCode.Invalid)
+            switch (resultCode)
             {
+                case CommandRequest.RequestCode.Invalid:
                     await Logger.LogError("Invalid content: " + message.Content);
                     return;
-            }
+                case CommandRequest.RequestCode.Forbidden:
-            else if (resultCode == CommandRequest.RequestCode.Forbidden)
-            {
                     await Logger.Log(
                         $"Unauthorized user tried to run command: {message.Author.Username} -> {message.Content}");
-            }
+                    break;
-
+                case CommandRequest.RequestCode.OK:
-            else if (resultCode == CommandRequest.RequestCode.OK)
-            {
                     if (!(message.Channel is IGuildChannel) && req.Item1.Command.ForbidInPm)
                     {
                         await Logger.Log(
                             $"User is trying to use blocked command in PM: {message.Author.Username}");
                         return;
                     }
-
                     await req.Item1.Command.Invoke(req.Item1);
-
+                    break;
+                case CommandRequest.RequestCode.UnknownCommand:
+                    var similar = await GetSimilarCommand(req.Item3.ToString());
+                    await message.Channel.SendMessageAsync(
+                        $"Unknown command: ``{req.Item3.ToString()}``. Did you mean: ``{similar}``?");
+                    break;
+                default:
+                    throw new ArgumentOutOfRangeException();
             }
         }
 
+        private static async Task<string> GetSimilarCommand(string command)
+        {
+            var closestString = "";
+            var similarity = int.MaxValue;
+            foreach (var cmd in Commands)
+            {
+                var distance = Lehvenstein.LevenshteinDistance(command, cmd.Key);
+                if (distance >= similarity)
+                    continue;
+                similarity    = distance;
+                closestString = cmd.Key;
+            }
+            return closestString;
+        }
+
         public static Command GetCommand(string name)
         {
             return Commands.TryGetValue(name.ToLowerInvariant(), out var com) ? com : null;

DeukBot4/MessageHandlers/CommandHandler/Commands/GeneralCommands.cs

@@ -55,8 +55,9 @@ usage:
             }
             else
             {
-                await request.OriginalMessage.Channel.SendMessageAsync(
+                await request.OriginalMessage.Channel.SendMessageAsync("", embed:
-                    HelpCommandGenerator.GenerateSpecificHelp(request.Parameters[0].AsString(), request.RequestPermissions));
+                    HelpCommandGenerator.GenerateSpecificHelp(request.Parameters[0].AsString(),
+                        request.RequestPermissions));
             }
         }
     }

DeukBot4/MessageHandlers/CommandHandler/Commands/ModeratorCommands.cs

@@ -12,29 +12,25 @@ namespace DeukBot4.MessageHandlers.CommandHandler
 
         [Command("kick", PermissionLevel.Moderator)]
         [CommandParameters(ParameterMatcher.ParameterType.User, ParameterMatcher.ParameterType.Remainder)]
-        [BlockUsageInPm]
+        [CommandHelp("Kicks a user from the server",
+            "Kicks a user from the server. Will not work on people with a helper role, or higher.\n" +
+            "Usage: \n" +
+            "``!kick {User Mention} {optional: Reason}``\n" +
+            "``!kick {User ID} {optional: Reason}``")]
+        [BlockUsageInPm, RequireParameterMatch]
         public async Task KickUser(CommandRequest request)
         {
             // get the server channel object out of message. Return if it's somehow not a server channel
             if (!(request.OriginalMessage.Channel is IGuildChannel channel))
                 return;
 
-            // if no parameters are found, stop
+            // get the id of the user, this parses the string to an id
-            if (request.Parameters.Length == 0)
+            var user = await request.Parameters[0].AsDiscordUser(channel.Guild);
-                return;
-            // if the first parameter is empty, stop, this means it's not a valid user id
-            if (string.IsNullOrWhiteSpace(request.Parameters[0].AsString()))
-                return;
-
-            // get the id, this parses the string to an id
-            var id = request.Parameters[0].AsUlong();
-            // get the user using this id and the channel object.
-            var user = await channel.Guild.GetUserAsync(id);
 
             // get the permissions of the user we want to kick
             var userPermissions =
                 await PermissionValidator.GetUserPermissionLevel(request.OriginalMessage.Channel, (SocketUser) user);
-            // if the user has sufficient permissions, or is this bot, warn the user that he's not allowed to do that, and stop
+            // if the user has sufficient permissions, or is deukbot, warn the user that he's not allowed to do that, and stop
             if (userPermissions >= PermissionLevel.Helper || user.Id == Program.Client.CurrentUser.Id)
             {
                 await request.OriginalMessage.Channel.SendMessageAsync("You are not allowed to kick that user");

DeukBot4/MessageHandlers/CommandHandler/HelpCommandGenerator.cs

@@ -1,6 +1,8 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Text;
 using DeukBot4.MessageHandlers.Permissions;
+using Discord;
 
 namespace DeukBot4.MessageHandlers.CommandHandler
 {
@@ -35,16 +37,24 @@ namespace DeukBot4.MessageHandlers.CommandHandler
             return sb.ToString();
         }
 
-        public static string GenerateSpecificHelp(string command, PermissionLevel level)
+        public static Embed GenerateSpecificHelp(string command, PermissionLevel level)
         {
-            if (!CommandHandler.Commands.TryGetValue(command, out var cmd))
+            if (!CommandHandler.Commands.TryGetValue(command.ToLowerInvariant(), out var cmd))
                 return null;
             if (cmd.Permission > level)
                 return null;
             if (!cmd.HasHelp)
                 return null;
 
-            return $"**{cmd.Name}** - *{cmd.LongHelp}*";
+            var eb = new EmbedBuilder
+            {
+                Title       = cmd.Name,
+                Description = cmd.LongHelp,
+                Color       = Color.Gold,
+            };
+
+
+            return eb.Build();
         }
     }
 }

DeukBot4/MessageHandlers/CommandHandler/RequestStructure/CommandRequest.cs

@@ -28,22 +28,22 @@ namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
 
         public enum RequestCode
         {
-            OK, Invalid, Forbidden
+            OK, UnknownCommand, Invalid, Forbidden
         }
 
-        public static async Task<(CommandRequest, RequestCode)> Create(SocketMessage message)
+        public static async Task<(CommandRequest, RequestCode, object)> Create(SocketMessage message)
         {
             var originalMessage = message;
             var content = message.Content;
             var res     = CommandNameMatcher.Match(content);
             if (res.Groups.Count <= 2)
-                return (null, RequestCode.Invalid);
+                return (null, RequestCode.Invalid, null);
 
             var commandName = res.Groups[1].Value;
             var command     = CommandHandler.GetCommand(commandName);
             if (command == null)
             {
-                return (null, RequestCode.Invalid);
+                return (null, RequestCode.UnknownCommand, commandName);
             }
 
             PermissionLevel permission;
@@ -54,15 +54,19 @@ namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
             catch (Exception e)
             {
                 await Logger.LogError(e.Message);
-                return (null, RequestCode.Forbidden);
+                return (null, RequestCode.Forbidden, null);
             }
             if (permission < command.Permission)
             {
-                return (null, RequestCode.Forbidden);
+                return (null, RequestCode.Forbidden, permission);
             }
             var parameterString = res.Groups[2].Value;
             var parameters = ParameterMatcher.GetParameterValues(command, parameterString);
-            return (new CommandRequest(originalMessage, command, permission, parameters), RequestCode.OK);
+            if (parameters == null)
+            {
+                return (null, RequestCode.Invalid, parameterString);
+            }
+            return (new CommandRequest(originalMessage, command, permission, parameters), RequestCode.OK, null);
         }
 
     }

DeukBot4/MessageHandlers/CommandHandler/RequestStructure/ParameterMatcher.cs

@@ -40,7 +40,7 @@ namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
                 case ParameterType.Remainder:
                     return " *(.*)";
                 case ParameterType.User:
-                    return " *(?:<@(?<id>\\d*)>)|(?<id>\\d*)";
+                    return " *<@(?<id>\\d+)>|(?<id>\\d+)";
                 default:
                     throw new ArgumentOutOfRangeException(nameof(type), type, null);
             }
@@ -56,7 +56,8 @@ namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
                     return matches.Groups.Skip(1).Select(x => new RequestParameter(x.Value)).ToArray();
                 }
             }
-            return new RequestParameter[0];
+
+            return command.RequireParameterMatch ? null : new RequestParameter[0];
         }
     }
 }

DeukBot4/MessageHandlers/CommandHandler/RequestStructure/RequestParameter.cs

@@ -1,4 +1,7 @@
 using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord;
 
 namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
 {
@@ -33,5 +36,14 @@ namespace DeukBot4.MessageHandlers.CommandHandler.RequestStructure
             }
             throw new ArgumentException();
         }
+
+        public async Task<IGuildUser> AsDiscordUser(IGuild guild)
+        {
+            if (ulong.TryParse(_value, out var i))
+            {
+                return await guild.GetUserAsync(i);
+            }
+            return null;
+        }
     }
 }

DeukBot4/MessageHandlers/MainHandler.cs

@@ -14,12 +14,23 @@ namespace DeukBot4.MessageHandlers
             }
             try
             {
-                await CommandHandler.CommandHandler.HandleMessage(message);
+#pragma warning disable 4014
+                CommandHandler.CommandHandler.HandleMessage(message);
+                HandlePrivateMessage(message);
+#pragma warning restore 4014
             }
             catch (Exception e)
             {
                 await Logger.LogError(e.ToString());
             }
         }
+
+        private static async Task HandlePrivateMessage(SocketMessage message)
+        {
+            if (message.Channel is ISocketPrivateChannel)
+            {
+                await Logger.Log(($"Private Message: {message.Author.Username}- {message.Content}"));
+            }
+        }
     }
 }

DeukBot4/Utilities/Lehvenstein.cs

@@ -0,0 +1,59 @@
+using System;
+
+namespace DeukBot4.Utilities
+{
+    public class Lehvenstein
+    {
+        /// <summary>
+        /// Calculates the Levenshtein distance between two strings--the number of changes that need to be made for the first string to become the second.
+        /// </summary>
+        /// <param name="first">The first string, used as a source.</param>
+        /// <param name="second">The second string, used as a target.</param>
+        /// <returns>The number of changes that need to be made to convert the first string to the second.</returns>
+        /// <remarks>
+        /// From http://www.merriampark.com/ldcsharp.htm
+        /// </remarks>
+        public static int LevenshteinDistance(string first, string second)
+        {
+            if (first == null)
+            {
+                throw new ArgumentNullException(nameof(first));
+            }
+            if (second == null)
+            {
+                throw new ArgumentNullException(nameof(second));
+            }
+
+            int n = first.Length;
+            int m = second.Length;
+            var d = new int[n + 1, m + 1]; // matrix
+
+            if (n == 0) return m;
+            if (m == 0) return n;
+
+            for (int i = 0; i <= n; d[i, 0] = i++)
+            {
+            }
+
+            for (int j = 0; j <= m; d[0, j] = j++)
+            {
+            }
+
+            for (int i = 1; i <= n; i++)
+            {
+
+                for (int j = 1; j <= m; j++)
+                {
+                    int cost = (second.Substring(j - 1, 1) == first.Substring(i - 1, 1) ? 0 : 1); // cost
+                    d[i, j] = Math.Min(
+                        Math.Min(
+                            d[i    - 1, j] + 1,
+                            d[i, j - 1]    + 1),
+                        d[i - 1, j - 1] + cost);
+                }
+            }
+
+            return d[n, m];
+        }
+    }
+}