using System.Diagnostics;
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,
            ParameterMatcher.ParameterType[][] parameterTypes, MethodInfo function, CommandContainerBase commandContainer)
        {
            Name = name;
            Permission = permission;
            ShortHelp = shortHelp;
            LongHelp = longHelp;
            Function = function;
            CommandContainer = commandContainer;
            ParameterTypes = parameterTypes;
            HasHelp = true;
        }

        public Command(string name, PermissionLevel permission, ParameterMatcher.ParameterType[][] parameterTypes,
            MethodInfo function, CommandContainerBase commandContainer)
        {
            Name       = name;
            Permission = permission;
            Function   = function;
            CommandContainer = commandContainer;
            ParameterTypes = parameterTypes;
            HasHelp    = false;
        }

        public string Name { get; }
        public PermissionLevel Permission { get; }
        public string ShortHelp { get; }
        public string LongHelp { get; }
        public MethodInfo Function { get; }
        public CommandContainerBase CommandContainer { get; }
        public bool HasHelp { get; }
        public ParameterMatcher.ParameterType[][] ParameterTypes { get; }

        private string[] _parameterMatchers;

        public string[] ParametersMatchers =>
            _parameterMatchers ?? (_parameterMatchers = ParameterMatcher.GenerateRegex(this));

        public async Task Invoke(CommandRequest request)
        {
            await (Task) Function.Invoke(CommandContainer, new object[] {request});
        }
    }
}