using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Threading;
using System.Runtime.CompilerServices;

namespace EAS.Distributed
{
    /// <summary>
    /// 文本文件日志记录器。
    /// </summary>
    /// <remarks>
    /// 日志输出到文本文件。
    /// </remarks>
    class TextLogger:IDisposable
    {
        private string path = "logs";
        private bool m_PathOK = false;

        #region 公共属性

        /// <summary>
        /// 日志路径。
        /// </summary>
        public string Path
        {
            get
            {
                return this.path;
            }
            set
            {
                this.path = value;
            }
        }

        #endregion

        void Initialize()
        {
        }

        /// <summary>
        /// 文件名称。
        /// </summary>
        public string FileName
        {
            get;
            set;
        }

        #region 求基础路径

        /// <summary>
        /// 求日志记录的基础路径。
        /// </summary>
        /// <returns></returns>
        string GetBasePath()
        {
            return XUpdate.Instance.GetBaseDirectory();
        }

        #endregion

        #region ILogger 成员

        public void Info(string message)
        {
            if (message == null) return;

            StringBuilder sb = new StringBuilder();
            sb.AppendLine(string.Format("{0},Info - {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), message));
            this.AppendLineText(sb);
        }

        public void Warn(string message)
        {
            if (message == null) return;

            StringBuilder sb = new StringBuilder();
            sb.AppendLine(string.Format("{0},Warn - {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), message));
            this.AppendLineText(sb);
        }

        public void Debug(string message)
        {
            if (message == null) return;

            StringBuilder sb = new StringBuilder();
            sb.AppendLine(string.Format("{0},Debug - {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), message));
            //sb.AppendLine();
            this.AppendLineText(sb);
        }

        public void Error(string message)
        {
            if (message == null) return;

            StringBuilder sb = new StringBuilder();
            sb.AppendLine(string.Format("{0},Error - {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), message));
            //sb.AppendLine();
            this.AppendLineText(sb);
        }

        public void Error(Exception exc)
        {
            if (exc == null) return;

            System.Exception exc2 = exc;

            while (true)
            {
                long ml = GC.GetTotalMemory(false);
                double memory = (double)ml / (1024 * 1024);
                StringBuilder sb = new StringBuilder();

                if (exc2 is System.Reflection.TargetInvocationException)
                {
                    //continue;
                }
                else if (exc2 is System.Reflection.TargetParameterCountException)
                {
                    //continue;
                }
                else if (exc2 is System.Reflection.TargetException)
                {
                    //continue;
                }
                else
                {
                    sb.AppendLine("[类型]:Error");
                    sb.AppendLine("[线程]:" + Thread.CurrentThread.ManagedThreadId.ToString());
                    sb.AppendLine("[内存]:" + memory.ToString("F2") + "M");
                    sb.AppendLine("[时间]:" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
                    sb.AppendLine("[内容]:" + exc2.Message);
                    sb.AppendLine("[来源]:" + exc2.Source);
                    sb.AppendLine("[目标]:" + exc2.TargetSite);
                    sb.AppendLine("[堆栈]:" + exc2.StackTrace);
                    this.AppendLineText(sb);
                }

                if (exc2.InnerException == null)
                    break;
                exc2 = exc2.InnerException;
            }
        }

        #endregion

        /// <summary>
        /// 2013-09-30，多线程排列写日志会导致页面转向之后会话和应用结束和重启，shit,Fuck iis。
        /// </summary>
        /// <param name="sb"></param>
        /// <param name="logType"></param>
        [MethodImpl(MethodImplOptions.Synchronized)]
        void AppendLineText(StringBuilder sb)
        {
            try
            {
                using (StreamWriter writer = this.GetStreamWriter())
                {
                    lock (writer)
                    {
                        writer.WriteLine(sb);
                    }
                }
            }
            catch (System.Exception exc)
            {
                //
            }
        }

        StreamWriter GetStreamWriter()
        {
            StreamWriter m_Writer = null;

            string m_Directory = this.Path;

            #region 处理路径

            if (!this.m_PathOK)
            {
                if (m_Directory.StartsWith("..\\"))
                {
                    string m_Path = this.GetBasePath();
                    while (true)
                    {
                        m_Path = Directory.GetParent(m_Path).ToString();
                        m_Directory = m_Directory.Substring(3, m_Directory.Length - 3);
                        if (!m_Directory.StartsWith("..\\"))
                        {
                            m_Directory = System.IO.Path.Combine(m_Path, m_Directory);
                            break;
                        }
                    }
                }
                else if (this.Path.IndexOf(":") < 0)
                {
                    string m_Path = this.GetBasePath();
                    m_Directory = System.IO.Path.Combine(m_Path, this.Path);
                }

                if (m_Directory.StartsWith("file:\\"))
                {
                    m_Directory = m_Directory.Substring(6, m_Directory.Length - 6);
                }

                this.path = m_Directory;
                this.m_PathOK = true;
            }

            #endregion

            if (!Directory.Exists(m_Directory))
                Directory.CreateDirectory(m_Directory);

            //升级日志。
            m_Directory = System.IO.Path.Combine(m_Directory, "update");
            if (!Directory.Exists(m_Directory))
                Directory.CreateDirectory(m_Directory);

            //当天记录。
            if (!string.IsNullOrEmpty(this.FileName))
            {
                m_Directory = System.IO.Path.Combine(m_Directory,string.Format("{0}.log",this.FileName));
            }
            else
            {
                m_Directory = System.IO.Path.Combine(m_Directory, string.Format("{0}.log",DateTime.Now.ToString("yyyyMMdd")));
            }

            if (File.Exists(m_Directory))
                m_Writer = File.AppendText(m_Directory);
            else
                m_Writer = File.CreateText(m_Directory);
            return m_Writer;
        }

        #region IDisposable 成员

        void IDisposable.Dispose()
        {
            
        }

        #endregion        
    }
}