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

namespace Wayne.Lib.StateEngine
{
    /// <summary>
    /// Add a keyword to the state. Group the keywords in categories.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1036:OverrideMethodsOnComparableTypes")]
    public sealed class KeywordDescriptionAttribute : Attribute, IComparable
    {
        #region Fields

        private object category;
        private object keyword;
        private string description;

        #endregion

        #region Construction

        /// <summary>
        /// Add a keyword to the state. Group the keywords in categories.
        /// </summary>        
        /// <param name="category">Category that the keyword belongs to.</param>
        /// <param name="keyword">Keyword that should be associated with the state.</param>
        /// <param name="description">Descriptive text.</param>
        public KeywordDescriptionAttribute(object category, object keyword, string description)
        {
            this.category = category;
            this.keyword = keyword;
            this.description = description;
        }

        /// <summary>
        /// Add a keyword to the state. Group the keywords in categories.
        /// </summary>        
        /// <param name="category">Category that the keyword belongs to.</param>
        /// <param name="keyword">Keyword that should be associated with the state.</param>
        public KeywordDescriptionAttribute(object category, object keyword)
            : this(category, keyword, "")
        {
        }

        #endregion

        #region Properties

        /// <summary>
        /// Category that the keyword belongs to.
        /// </summary>
        public object Category
        {
            get { return category; }
        }

        /// <summary>
        /// Keyword that should be associated with the state.
        /// </summary>
        public object Keyword
        {
            get { return keyword; }
        }

        /// <summary>
        /// Keyword as a string.
        /// </summary>
        public string KeywordText
        {
            get
            {
                Type keywordAsType = keyword as Type;
                if (keywordAsType != null)
                    return keywordAsType.FullName;
                return keyword.ToString(); 
            }
        }

        /// <summary>
        /// Descriptive text.
        /// </summary>
        public string Description
        {
            get { return description; }
        }

        #endregion

        #region IComparable Members

        /// <summary>
        /// Compares this attribute with another one.
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public int CompareTo(object obj)
        {
            int result = 0;
            KeywordDescriptionAttribute compareKeywordDescriptionAttribute = obj as KeywordDescriptionAttribute;
            if (compareKeywordDescriptionAttribute != null)
            {
                result = category.ToString().CompareTo(compareKeywordDescriptionAttribute.category.ToString());
                if (result == 0)
                    result = KeywordText.CompareTo(compareKeywordDescriptionAttribute.KeywordText);
            }
            return result;
        }

        #endregion
    }
}