using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using FireBirdUtil.SqlUtils;
using WeighBusiness.BO.CreateTables;

namespace WeighBusiness.Utils
{
  public class BackupUtil
  {
		/// <summary>
		/// 创建备份数据库
		/// </summary>
		/// <returns>失败则返回失败信息。</returns>
		public static string CreateDataBaseAndTable()
		{
			try
			{
				string errorMessage;
				var success = CreateDataBaseIfNotExist(out errorMessage);
				if (!success)
				{
					return "备份数据库创建失败" + Environment.NewLine + errorMessage;
				}
				success = CreateTableIfNotExist(out errorMessage);
				if (!success)
					return "备份数据表创建失败" + Environment.NewLine + errorMessage;
			}
			catch (Exception ex)
			{
				return "在创建备份数据库时碰到错误：" + ex.Message;
			}
			return string.Empty;
		}


	  static bool CreateDataBaseIfNotExist(out string errorMessage) 
		{
			errorMessage = string.Empty;
			try
			{
				var folder = new FileInfo(TableNames.数据库_backup).Directory.FullName;
				if (!Directory.Exists(folder))
				{
					Directory.CreateDirectory(folder);
				}
				SQLExecuteUtil.CreateDataBaseIfNotExist(TableNames.数据库_backup);
				return true;
			}
			catch (Exception ex)
			{
				errorMessage = ex.ToString();
				return false;
			}
		}


	  static bool CreateTableIfNotExist(out string errorMessage)
		{
			if (!new CreateProductCatalog(TableNames.数据库_backup,TableNames.客户端产品分类).Create(out errorMessage))
				return false;
			if (!new CreateSelectedProductCatalogGoods(TableNames.数据库_backup, TableNames.客户端产品分类配制存货).Create(out errorMessage))
				return false; 
			return true;
		}
	}
}