using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata.Ecma335;
using DeukBot4.MessageHandlers.CommandHandler.RequestStructure;

namespace DeukBot4.MessageHandlers.CommandHandler
{
    public abstract class CommandContainerBase
    {
        public abstract string Name { get; }

        public Command[] GetCommands()
        {
            var funcs = GetType().GetMethods()
                .Where(x => x.GetCustomAttributes(typeof(CommandAttribute), true).Length > 0);
            var commands = new List<Command>();

            foreach (var methodInfo in funcs)
            {
                var commandAttributes = methodInfo.GetCustomAttributes(typeof(CommandAttribute), true)
                    .Select(x => x as CommandAttribute);

                CommandHelpAttribute helpAttribute = null;
                var helpAttributes = methodInfo.GetCustomAttributes(typeof(CommandHelpAttribute), true)
                    .Select(x => x as CommandHelpAttribute);
                var commandHelpAttributes = helpAttributes as CommandHelpAttribute[] ?? helpAttributes.ToArray();
                if (commandHelpAttributes.Any())
                    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();

                foreach (var commandAttribute in commandAttributes)
                {
                    if (commandAttribute == null)
                        continue;
                    if (helpAttribute == null)
                    {
                        commands.Add(new Command(commandAttribute.Command, commandAttribute.Permission, parameters,
                            methodInfo, this));
                    }
                    else
                    {
                        commands.Add(new Command(commandAttribute.Command, commandAttribute.Permission,
                            helpAttribute.ShortHelp, helpAttribute.LongHelp, parameters, methodInfo, this));

                    }
                }
            }
            return commands.ToArray();
        }
    }
}