using Discord.Commands;
using System;

namespace Discord
{
    public partial class DiscordBotClient : DiscordClient
	{
		public class PermissionException : Exception { public PermissionException() : base("User does not have permission to run this command.") { } }

		public class CommandEventArgs
		{
			public Message Message { get; }
			public Command Command { get; }
			public string CommandText { get; }
			public int? Permissions { get; }
			public string[] Args { get; }

			public User User => Message.User;
			public string UserId => Message.UserId;
			public Channel Channel => Message.Channel;
			public string ChannelId => Message.ChannelId;
			public Server Server => Message.Channel.Server;
			public string ServerId => Message.Channel.ServerId;

			public CommandEventArgs(Message message, Command command, string commandText, int? permissions, string[] args)
			{
				Message = message;
				Command = command;
				CommandText = commandText;
				Permissions = permissions;
				Args = args;
			}
		}
		public class CommandErrorEventArgs : CommandEventArgs
		{
			public Exception Exception { get; }

			public CommandErrorEventArgs(CommandEventArgs baseArgs, Exception ex)
				: base(baseArgs.Message, baseArgs.Command, baseArgs.CommandText, baseArgs.Permissions, baseArgs.Args)
			{
				Exception = ex;
            }
		}

		public event EventHandler<CommandEventArgs> RanCommand;
		private void RaiseRanCommand(CommandEventArgs args)
		{
			if (RanCommand != null)
				RanCommand(this, args);
		}
		public event EventHandler<CommandEventArgs> UnknownCommand;
		private void RaiseUnknownCommand(CommandEventArgs args)
		{
			if (UnknownCommand != null)
				UnknownCommand(this, args);
		}
		public event EventHandler<CommandErrorEventArgs> CommandError;
		private void RaiseCommandError(CommandEventArgs args, Exception ex)
		{
			if (CommandError != null)
				CommandError(this, new CommandErrorEventArgs(args, ex));
		}
	}
}