2018-03-28 23:34:48 +00:00
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Threading.Tasks;
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using DeukBot4.MessageHandlers.CommandHandler.RequestStructure;
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using DeukBot4.MessageHandlers.Permissions;
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using DeukBot4.Utilities;
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2018-03-29 19:57:16 +00:00
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using Discord;
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2018-03-28 23:34:48 +00:00
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using Discord.WebSocket;
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namespace DeukBot4.MessageHandlers.CommandHandler
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{
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public static class CommandHandler
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{
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2018-03-30 12:51:38 +00:00
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public static Dictionary<string, Command> Commands { get; } = new Dictionary<string, Command>();
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2018-03-30 13:41:42 +00:00
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public const char CommandTrigger = '!';
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2018-03-28 23:34:48 +00:00
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public static void Build()
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{
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var commandContainers = typeof(CommandHandler).Assembly.GetTypes()
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.Where(x => typeof(CommandContainerBase).IsAssignableFrom(x) && !x.IsAbstract);
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foreach (var commandContainer in commandContainers)
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{
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if (!(Activator.CreateInstance(commandContainer) is CommandContainerBase obj))
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continue;
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var commands = obj.GetCommands();
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foreach (var command in commands)
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{
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Commands.Add(command.Name.ToLowerInvariant(), command);
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2018-05-06 17:15:42 +00:00
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foreach (var commandAlternative in command.Alternatives)
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{
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Commands.Add(commandAlternative.ToLowerInvariant(), command);
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}
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2018-03-28 23:34:48 +00:00
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}
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2018-08-13 16:41:59 +00:00
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Logger.Main.Log(
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2018-03-30 12:51:38 +00:00
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$"Loaded following commands for container {obj.Name}: {commands.Select(x => x.Name).Join(", ")}");
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2018-03-28 23:34:48 +00:00
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}
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}
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public static async Task HandleMessage(SocketMessage message)
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{
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2018-03-29 17:38:23 +00:00
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if (string.IsNullOrWhiteSpace(message.Content))
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return;
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2018-03-30 13:41:42 +00:00
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if (message.Content[0] != CommandTrigger && message.MentionedUsers.All(x => x.Id != Program.BotId))
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2018-03-30 12:51:38 +00:00
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return;
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2018-07-30 19:46:57 +00:00
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if (message.Content[1] == '!')
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return;
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2018-03-30 12:51:38 +00:00
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2018-03-29 13:35:00 +00:00
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var req = await CommandRequest.Create(message);
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2018-03-28 23:34:48 +00:00
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var resultCode = req.Item2;
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2018-03-30 12:51:38 +00:00
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switch (resultCode)
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2018-03-28 23:34:48 +00:00
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{
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2018-03-30 12:51:38 +00:00
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case CommandRequest.RequestCode.Invalid:
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2018-08-13 16:41:59 +00:00
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await Logger.Main.LogError("Invalid content: " + message.Content);
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2018-03-30 12:51:38 +00:00
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return;
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2018-03-30 13:41:42 +00:00
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case CommandRequest.RequestCode.InvalidParameters:
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2018-08-13 16:41:59 +00:00
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await Logger.Main.LogError("Invalid parameters: " + message.Content);
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2018-03-30 13:41:42 +00:00
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break;
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2018-03-30 12:51:38 +00:00
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case CommandRequest.RequestCode.Forbidden:
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2018-08-13 16:41:59 +00:00
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await Logger.Main.Log(
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2018-03-30 12:51:38 +00:00
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$"Unauthorized user tried to run command: {message.Author.Username} -> {message.Content}");
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break;
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case CommandRequest.RequestCode.OK:
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if (!(message.Channel is IGuildChannel) && req.Item1.Command.ForbidInPm)
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{
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2018-08-13 16:41:59 +00:00
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await Logger.Main.Log(
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2018-03-30 12:51:38 +00:00
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$"User is trying to use blocked command in PM: {message.Author.Username}");
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return;
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}
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2018-08-12 11:11:20 +00:00
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try
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{
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await req.Item1.Command.Invoke(req.Item1);
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}
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catch (Exception e)
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{
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2018-08-13 16:41:59 +00:00
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await Logger.Main.Log("An error occured: \n" + e);
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2018-08-12 11:11:20 +00:00
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}
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2018-03-30 12:51:38 +00:00
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break;
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case CommandRequest.RequestCode.UnknownCommand:
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2018-03-30 13:41:42 +00:00
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var permission = await PermissionValidator.GetUserPermissionLevel(message);
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var similar = await GetSimilarCommand(req.Item3.ToString(), permission);
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2018-03-30 12:51:38 +00:00
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await message.Channel.SendMessageAsync(
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2018-03-30 13:41:42 +00:00
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$"Unknown command: ``{req.Item3.ToString()}``. Did you mean: ``{similar}``? " +
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$"Alternatively, use ``{CommandTrigger}help`` for a list of all commands");
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2018-03-30 12:51:38 +00:00
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break;
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default:
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throw new ArgumentOutOfRangeException();
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2018-03-28 23:34:48 +00:00
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}
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2018-03-30 12:51:38 +00:00
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}
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2018-03-29 19:57:16 +00:00
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2018-03-30 13:41:42 +00:00
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private static async Task<string> GetSimilarCommand(string command, PermissionLevel permission)
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2018-03-30 12:51:38 +00:00
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{
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var closestString = "";
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var similarity = int.MaxValue;
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foreach (var cmd in Commands)
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2018-03-28 23:34:48 +00:00
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{
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2018-03-30 13:41:42 +00:00
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if (cmd.Value.Permission > permission)
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continue;
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2018-03-30 12:51:38 +00:00
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var distance = Lehvenstein.LevenshteinDistance(command, cmd.Key);
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if (distance >= similarity)
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continue;
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similarity = distance;
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closestString = cmd.Key;
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2018-03-28 23:34:48 +00:00
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}
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2018-03-30 12:51:38 +00:00
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return closestString;
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2018-03-28 23:34:48 +00:00
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}
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public static Command GetCommand(string name)
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{
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return Commands.TryGetValue(name.ToLowerInvariant(), out var com) ? com : null;
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}
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}
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}
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