using System;
using System.Collections.Generic;
using System.Text;

namespace RecrownedAthenaeum.Tools.CommandProcessor
{
    public abstract class EngineCommand
    {
        bool CaseSensitiveName = false;

        /// <summary>
        /// the words a user can type that will invoke this command.
        /// </summary>
        public string[] invokeStrings;

        public EngineCommand(params string[] invokeStrings)
        {
            this.invokeStrings = invokeStrings ?? throw new ArgumentNullException();
        }

        /// <summary>
        /// Whether or not this command should be invoked given the string.
        /// </summary>
        /// <param name="command">The string that acts as the command.</param>
        /// <returns>whether or not this command is invoked.</returns>
        public bool IsInvoked(string command)
        {
            if (!CaseSensitiveName) command = command.ToLower();
            for (int i = 0; i < invokeStrings.Length; i++)
            {
                if (!CaseSensitiveName)
                {
                    if (invokeStrings[i].ToLower() == command) return true;
                } else
                {
                    if (invokeStrings[i] == command) return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Runs the command.
        /// </summary>
        /// <param name="arguments">arguments to be used. May be null.</param>
        public virtual void Run(string[] arguments = null)
        {

        }

        /// <summary>
        /// Returns the help for the given argument for this command. If no argument is defined, general help for the command should be given.
        /// If no argument is given (null), then returns overall help statement.
        /// Overall help should list possible arguments for user to use "help [command] [arg]" format.
        /// Arguments can then be separately returned from help as the help command will pass in the argument the user requests to see in detail in the parameter.
        /// </summary>
        /// <param name="argument">The argument the help string is for. Can be null for overall command help.</param>
        /// <returns>The text to help understand the argument or the overall command.</returns>
        public virtual string Help(string argument = null)
        {
            return "This command doesn't define a help string. Shame on it.";
        }
    }
}