using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
using System.Text;
using System.IO;

/// <summary>
/// Summary description for ReportParameter
/// </summary>
public class ReportParameter
{
  private SortedList<string, string> _paramList = new SortedList<string, string>();
 
  public ReportParameter()
  {
  }

  public void Add(string name, string value)
  {
    if (!_paramList.ContainsKey(name))
      _paramList.Add(name, value);
    else
      _paramList[name] = value;
  }

  public void Clear()
  {
    _paramList.Clear();
  }

  public string Save(string fileName, bool random)
  {
    string realFileName = GetRealFileName(fileName, random);
    if (File.Exists(realFileName))
      File.Delete(realFileName);
    using (StreamWriter sw = File.CreateText(realFileName))
    {
      for (int i = 0; i < _paramList.Count; i++)
      {
        sw.WriteLine(String.Format("{0}={1}", _paramList.Keys[i], _paramList.Values[i]));
      }
      sw.Close();
    }
    return realFileName;
  }

  /// <summary>
  /// 為檔案名稱加上隨機字尾
  /// </summary>
  private string GetRealFileName(string fileName, bool random)
  {
    if (!random)
      return fileName;

    string ext = Path.GetExtension(fileName);
    string s = Path.ChangeExtension(fileName, null);
    do
    {
      Random r = new Random();
      int suffix = r.Next(int.MaxValue);
      fileName = String.Format("{0}_{1:x8}{2}", s, suffix, ext);
    }
    while (File.Exists(fileName));

    return fileName;
  }

}