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using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;

namespace ConsoleAppLogs
{
    /// <summary>
    /// 日志策略接口
    /// </summary>
    public interface ILogStrategy
    {
        /// <summary>
        /// 写入日志
        /// </summary>
        /// <param name="message">消息</param>
        void Write(string message);
    }

    /// <summary>
    /// 日志操作管理类
    /// </summary>
    public class Logs
    {
        private static ILogStrategy _ilogstrategy = new LogStrategy();//日志策略

        /// <summary>
        /// 写入日志
        /// </summary>
        /// <param name="message">消息</param>
        public static void Write(string message)
        {
            _ilogstrategy.Write(message);
        }

        /// <summary>
        /// 写入日志
        /// </summary>
        /// <param name="ex">异常对象</param>
        public static void Write(Exception ex)
        {
            _ilogstrategy.Write(string.Format("{0}{1}{2}", ex.Message, Environment.NewLine, ex.StackTrace));
        }
    }

    /// <summary>
    /// 基于txt文件的日志策略
    /// </summary>
    public class LogStrategy : ILogStrategy
    {
        private static object _locker = new object();//锁对象
        private static int _fileCountLimit = 31;//A long month of logs

        /// <summary>
        /// 写入日志
        /// </summary>
        /// <param name="message">消息</param>
        public void Write(string message)
        {
            lock (_locker)
            {
                FileStream fs = null;
                StreamWriter sw = null;
                try
                {
                    string basePath = AppDomain.CurrentDomain.BaseDirectory;
                    string logName = string.Format("log{0}.txt", DateTime.Now.ToString("yyyyMMdd"));
                    string fileName = Path.Combine(basePath, "logs", logName);

                    FileInfo fileInfo = new FileInfo(fileName);
                    if (!fileInfo.Directory.Exists)
                    {
                        fileInfo.Directory.Create();
                    }
                    if (!fileInfo.Exists)
                    {
                        fileInfo.Create().Close();
                        //清理文件,只保留一定数量的文件
                        FileInfo[] fis = fileInfo.Directory.GetFiles("log*.txt", SearchOption.TopDirectoryOnly);
                        if(fis.Length > _fileCountLimit)
                        {
                            Array.Sort(fis, delegate (FileInfo f1, FileInfo f2)
                            {
                                return f2.Name.CompareTo(f1.Name);
                            });
                            for(int i = _fileCountLimit; i < fis.Length; i++)
                            {
                                FileInfo f = fis[i];
                                f.Delete();
                            }
                        }
                    }
                    else if (fileInfo.Length > 2048 * 1000)
                    {
                        fileInfo.Delete();
                    }

                    fs = fileInfo.OpenWrite();
                    sw = new StreamWriter(fs);
                    sw.BaseStream.Seek(0, SeekOrigin.End);

                    sw.Write("{0}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
                    sw.Write(Environment.NewLine);

                    StackFrame stackFrame = FindStackFrame();
                    MethodBase methodBase = GetCallingMethodBase(stackFrame);
                    string callingClass = methodBase.ReflectedType.FullName;
                    string callingMethod = methodBase.Name;
                    sw.Write("{0}.{1}", callingClass, callingMethod);
                    sw.Write(Environment.NewLine);

                    sw.Write(message);
                    sw.Write(Environment.NewLine);
                    sw.Write(Environment.NewLine);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
                finally
                {
                    if (sw != null)
                    {
                        sw.Flush();
                        sw.Close();
                    }
                    if (fs != null)
                    {
                        fs.Close();
                    }
                }
            }
        }

        private static StackFrame FindStackFrame()
        {
            StackTrace stackTrace = new StackTrace();
            int i = 0;
            foreach (StackFrame item in stackTrace.GetFrames())
            {
                MethodBase methodBase = item.GetMethod();
                string name = MethodBase.GetCurrentMethod().Name;
                if (!methodBase.Name.Equals("Write") && !methodBase.Name.Equals(name))
                    return new StackFrame(i, false);
                i++;
            }
            return null;
        }

        private static MethodBase GetCallingMethodBase(StackFrame stackFrame)
        {
            return stackFrame == null
                ? MethodBase.GetCurrentMethod() : stackFrame.GetMethod();
        }
    }
}