using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Utils.Attributes
{
	[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
	public sealed class DataReferenceAttribute : Attribute
	{
		public DataReferenceAttribute(string thisTableJoinProperty, Type otherTableType, string needPropert)
		{
			_ThisTableJoinProperty = thisTableJoinProperty;
			_OtherTableType = otherTableType;
			_OtherTableJoinProperty = "ID";
			_NeedPropert = needPropert;
		}

		public DataReferenceAttribute(string thisTableJoinProperty, Type otherTableType, string otherTableJoinProperty, string needPropert)
			: this(thisTableJoinProperty, otherTableType, needPropert)
		{
			_OtherTableJoinProperty = otherTableJoinProperty;
		}

		private string _ThisTableJoinProperty;
		public string ThisTableJoinProperty { get { return _ThisTableJoinProperty; } private set { _ThisTableJoinProperty = value; } }
		private Type _OtherTableType;
		private string _OtherTableJoinProperty;
		private string _NeedPropert;

		public object GetValue(string thisTablePropertyValue, string connectionStr)
		{
			if (thisTablePropertyValue.IsNullOrEmpty() || thisTablePropertyValue == "0")
				return string.Empty;
			var tableName = _OtherTableType.Name;
			string sql = "select {0} from {1} where {2} = '{3}'";

			sql = string.Format(sql, _NeedPropert, tableName, _OtherTableJoinProperty, thisTablePropertyValue);
			SqlDataAdapter da = new SqlDataAdapter(sql, connectionStr);
			DataSet ds = new DataSet();
			da.Fill(ds);

			var table = ds.Tables[0];
			if (table.Rows.Count == 0)
				return "";
			return table.Rows[0][0];//table.Rows[0][_NeedPropert]
		}
	}
}