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

namespace ChadSoft
{
    /// <summary>
    /// Parses an array of command line arguments into a more usable object.
    /// </summary>
    public class CommandLineParameters //: IDictionary<string, string>
    {
        #region Constants
        private const string PARAMETER_REGEX = @"[-/]-?([\w\.]*)(?:[=:]([\w\.]*)?)?";
        #endregion

        #region Properties
        private Dictionary<string, string> _Parameters = new Dictionary<string, string>();
        private Dictionary<string, string> Parameters
        {
            get { return _Parameters; }
        }
        #endregion

        #region Constructors
        public CommandLineParameters(string[] args)
        {
            ParseArguments(args);
        }
        #endregion

        #region Internal Helper Methods
        protected internal void ParseArguments(string[] args)
        {
            // Populate the Parameters
            foreach (Match parameter in Regex.Matches(String.Join(" ", args), PARAMETER_REGEX))
                this[parameter.Groups[1].Value] = parameter.Groups[2].Value;
        }
        #endregion

        #region Indexer
        protected string this[string key]
        {
            get
            {
                string val = null;
                Parameters.TryGetValue(key.ToUpper(), out val);
                return val;
            }
            set
            {
                if (Parameters.ContainsKey(key.ToUpper()))
                    Parameters[key.ToUpper()] = value;
                else
                    Parameters.Add(key.ToUpper(), value);
            }
        }
        #endregion


        #region IDictionary<string,string> Members

        //public void Add(string key, string value) { Parameters.Add(key, value); }
        //public bool ContainsKey(string key) { Parameters.ContainsKey(key); }
        //public ICollection<string> Keys { get { return Parameters.Keys; } }
        //public bool Remove(string key) { return Parameters.Remove(key); }
        //public bool TryGetValue(string key, out string value) { return Parameters.TryGetValue(key, out value); }
        //public ICollection<string> Values { get { return Parameters.Values; } }

        #endregion

    }
}