using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Configuration;

namespace Epost.Common
{
    public class ConfigurationOperator
    {

        public bool UpdateAppSettings(string key, string value)
        {
            bool reuslt = false;

            try
            {
                //   Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
                SetFileAccess(config.FilePath + "", false);
                ConfigurationSection sections = config.GetSection("appSettings");
                bool isSet = false;
                for (int i = 0; i < ((System.Configuration.AppSettingsSection)(sections)).Settings.Count; i++)
                {
                    string itemkey = ((System.Configuration.AppSettingsSection)(sections)).Settings.AllKeys[i];
                    if (itemkey == key)
                    {
                        ((System.Configuration.AppSettingsSection)(sections)).Settings.Remove(key);
                        ((System.Configuration.AppSettingsSection)(sections)).Settings.Add(key, value);
                        isSet = true;
                        break;
                    }
                }
                if (!isSet)
                {
                    ((System.Configuration.AppSettingsSection)(sections)).Settings.Add(key, value);
                }

                config.Save();
                ConfigurationManager.RefreshSection("appSettings");

                SetFileAccess(config.FilePath + "", true);
                reuslt = true;
            }
            catch (Exception ex)
            {
                //  LogNet.Log.WriteLog("UpdateAppSettings", ex);
            }

            return reuslt;
        }

        protected void SetFileAccess(string path, bool isReadOnly)
        {
            FileInfo fi = new FileInfo(path);
            if (fi.IsReadOnly != isReadOnly)
                fi.IsReadOnly = isReadOnly;
        }



        //检查文件,如果文件不存在则创建   
        public void ExistsFile(string FilePath)
        {
            //if(!File.Exists(FilePath))   
            //File.Create(FilePath);   
            //以上写法会报错,详细解释请看下文.........  
            if (!File.Exists(FilePath))
            {
                FileStream fs = File.Create(FilePath);
                fs.Close();
            }
        }
        public string ReadTxt()
        {
            string path = ConfigurationManager.AppSettings["SetupMode"];
            ExistsFile(path);//检查文件是否存在   
                                      //读取文件   
            StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);
            try
            {
                string input = sr.ReadToEnd();
                sr.Close();
                          
                input = input.Replace("\r\n", "").Replace("\n", ""); 
                return input;                                               
            }
            catch(Exception ex)
            {             
                LogHelper.WriteLogInfo("读取txt异常"+ex.Message);
                return "";
            }
        }

        public bool WriteTxt(string txt)
        {
            string path = ConfigurationManager.AppSettings["SetupMode"];
            ExistsFile(path);//检查文件是否存在   
                                                           //写入文本  
            StreamWriter sr = new StreamWriter(path, false, System.Text.Encoding.Default);
            try
            {
                sr.Write(txt);
                sr.Close();
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogInfo("写入txt异常" + ex.Message);
                return false;
            }
        }
    }
}