using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;

namespace Ant.ORM
{
    public static class StringExtension
    {
        /// <summary>
        /// 在SQL语句后面追加注释
        /// </summary>
        /// <param name="sql">需追加注释的SQL语句</param>
        /// <param name="author">作者</param>
        /// <param name="forUse">SQL的功能描述</param>
        /// <param name="fileName">SQL所在的文件名</param>
        /// <param name="funName">SQL所在的方法名</param>
        /// <returns>添加注释后的SQL</returns>
        private static string SqlAppendComment(this string sql,
             string author, string forUse, string fileName, string funName, string projectname)
        {

            if (author == null)
            {
                throw new ArgumentNullException("author参数为null或空字符串");
            }
            if (string.IsNullOrEmpty(forUse))
            {
                throw new ArgumentNullException("forUse参数为null或空字符串");
            }
            if (string.IsNullOrEmpty(fileName))
            {
                throw new ArgumentNullException("fileName参数为null或空字符串");
            }
            if (string.IsNullOrEmpty(funName))
            {
                throw new ArgumentNullException("funName参数为null或空字符串");
            }

            return
                string.Format(
                    @"{0}
                --Flat:{5}/Author:{1}/For:{2}/File:{3}/Fun:{4}",
                    sql,
                    author,
                    forUse,
                    fileName,
                    funName,
                   projectname);
        }

        /// <summary>
        /// 在SQL语句后面追加注释
        /// </summary>
        /// <param name="sql">
        /// 需追加注释的SQL语句
        /// </param>
        /// <param name="comment">
        /// 评论注释
        /// </param>
        /// <returns>
        /// 添加注释后的SQL
        /// </returns>
        public static string AppendComment(this string sql,
             SqlComment comment)
        {
            if (!SqlComment.IsTest)
            {
                return sql.SqlAppendComment(comment.Author, comment.ForUse, comment.FileName, comment.FunName,comment.ProjectName);
            }
            return sql;
        }



        /// <summary>
        /// 插入Sql评论
        /// </summary>
        public class SqlComment
        {
            /// <summary>
            /// 作者
            /// </summary>
            public string Author { get; set; }

            /// <summary>
            /// 用途
            /// </summary>
            public string ForUse { get; set; }

            /// <summary>
            /// 文件名
            /// </summary>
            public string FileName { get; set; }

            /// <summary>
            /// 函数名
            /// </summary>
            public string FunName { get; set; }

            /// <summary>
            /// 是否是测试
            /// </summary>
            public static bool IsTest { get; set; }
            /// <summary>
            /// 项目名称
            /// </summary>
            public string ProjectName { get; set; }
        }
    }
}