using System;
using System.IO;
using System.Text;
using Microsoft.VisualBasic;

namespace Rainsoft.Text
{
  /// <summary>
  /// 字符串编码转换类
  /// </summary>
  public class StringEncoding
  {
    private StringEncoding()
    {
    }

    /// <summary>
    /// 将字符串转换为简体中文
    /// </summary>
    public static string ToSimplifiedChinese(string s)
    {
      return Microsoft.VisualBasic.Strings.StrConv(s, VbStrConv.SimplifiedChinese, 0);
    }

    /// <summary>
    /// 将文件转换为简体中文
    /// </summary>
    /// <param name="filename">源文件名</param>
    /// <param name="encoding">源文件字符编码</param>
    /// <param name="outFilename">目标文件名</param>
    /// <param name="outEncoding">目标文件字符编码</param>
    /// <example>
    /// <code>
    /// ToSimplifiedChinese("big5.txt", Encoding.GetEncoding("big5"), "gb.txt", Encoding.GetEncoding("gb2312"));
    /// ToSimplifiedChinese("big5.txt", Encoding.GetEncoding("big5"), "gb.txt", Encoding.UTF8);
    /// </code>
    /// </example>
    public static void ToSimplifiedChinese(string filename, Encoding encoding, string outFilename, Encoding outEncoding)
    {
      StreamReader r = new StreamReader(filename, encoding);
      StreamWriter w = new StreamWriter(outFilename, false, outEncoding);
      try
      {
        w.Write(Strings.StrConv(r.ReadToEnd(), VbStrConv.SimplifiedChinese, 0));
        w.Flush();
      }
      finally
      {
        w.Close();
        r.Close();
      }
    }

    /// <summary>
    /// 将字符串转换为繁体中文
    /// </summary>
    public static string ToTraditionalChinese(string s)
    {
      return Microsoft.VisualBasic.Strings.StrConv(s, VbStrConv.TraditionalChinese, 0);
    }

    /// <summary>
    /// 将文件转换为繁体中文
    /// </summary>
    /// <param name="filename">源文件名</param>
    /// <param name="encoding">源文件字符编码</param>
    /// <param name="outFilename">目标文件名</param>
    /// <param name="outEncoding">目标文件字符编码</param>
    /// <example>
    /// <code>
    /// ToTraditionalChinese("gb.txt", Encoding.GetEncoding("gb2312"), "gb.txt", Encoding.GetEncoding("big5"));
    /// ToTraditionalChinese("gb.txt", Encoding.GetEncoding("gb2312"), "gb.txt", Encoding.UTF8);
    /// </code>
    /// </example>
    public static void ToTraditionalChinese(string filename, Encoding encoding, string outFilename, Encoding outEncoding)
    {
      StreamReader r = new StreamReader(filename, encoding);
      StreamWriter w = new StreamWriter(outFilename, false, outEncoding);
      try
      {
        w.Write(Strings.StrConv(r.ReadToEnd(), VbStrConv.TraditionalChinese, 0));
        w.Flush();
      }
      finally
      {
        w.Close();
        r.Close();
      }
    }
  }
}