using System;
using System.IO;
using System.Text;

namespace PackingPress.Common
{
    public static class FileHelper
    {
        public static void WriteFile(string fileName, string contexts, string encodingStr = "UTF-8")
        {
            try
            {
                if (!string.IsNullOrEmpty(fileName))
                {
                    using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.ReadWrite))
                    {
                        Encoding textEncoding = Encoding.GetEncoding(encodingStr.ToUpper());
                        using (StreamWriter streamWriter = new StreamWriter(fs, textEncoding))
                        {
                            streamWriter.Write(contexts);
                        }
                    }
                }
            }
            catch { }
        }

        public static void AppendWriteFile(string fileName, string contexts, string encodingStr = "UTF-8")
        {
            try
            {
                if (!string.IsNullOrEmpty(fileName))
                {
                    using (FileStream fs = new FileStream(fileName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
                    {
                        Encoding textEncoding = Encoding.GetEncoding(encodingStr.ToUpper());
                        using (StreamWriter streamWriter = new StreamWriter(fs, textEncoding))
                        {
                            streamWriter.Write(contexts);
                        }
                    }
                }
            }
            catch { }
        }

        public static string ReaderFile(string fileName, string encodingStr = "UTF-8")
        {
            try
            {
                if (File.Exists(fileName))
                {
                    using (var fileStream = File.OpenRead(fileName))
                    {
                        using (StreamReader reader = new StreamReader(fileStream, System.Text.Encoding.GetEncoding(encodingStr)))
                        {
                            if (reader.Peek() != -1)//防止读不完全问题
                            {
                                string txtline = reader.ReadToEnd();
                                return txtline;
                            }
                        }
                    }
                }
            }
            catch { }
            return string.Empty;
        }

        public static void DeleteFile(string fileName)
        {
            try
            {
                if (File.Exists(fileName))
                {
                    File.Delete(fileName);
                }
            }
            catch { }
        }
    }
}