using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using Zhaizj.Framework.Web;
using System.IO;

namespace Zhaizj.Framework.Log
{

    /// <summary>
    /// 日志配置文件，默认配置文件在 /framework/config/log.config，日志文件在 /framework/log/log.txt 中
    /// </summary>
    public class LogConfig
    {
        /// <summary>
        /// 日志配置信息(全局缓存)
        /// <remarks>
        /// logLevel 的值(不区分大小写)：none, debug, info, warn, error, fatal, all；
        /// logFile 和 logProvider 通常不用填写
        /// </remarks>
        /// <example>
        /// 配置文件的格式(一行一条配置，键值之间用冒号分开)。
        /// <code>
        /// logLevel : info
        /// logFile : log/log.txt
        /// logProvider : Zhaizj.Framework.Log.FileLogger
        /// </code>
        /// </example>
        /// </summary>
        public static readonly LogConfig Instance = new LogConfig();
        /// <summary>
        /// 日志配置内容
        /// </summary>
        public Dictionary<String, String> dic = new Dictionary<String, String>();
        /// <summary>
        /// 构造函数初始化
        /// </summary>
        private LogConfig()
        {
            String absPath = getConfigAbsPath();
            dic = cfgHelper.Read(absPath);
            this.FilePath = getFilePath(dic);
            this.Level = getLevel(dic);
            this.LoggerImpl = getLoggerImpl(dic);
        }
        /// <summary>
        /// 获取日志级别
        /// </summary>
        /// <param name="dic"></param>
        /// <returns></returns>
        private LogLevel getLevel(Dictionary<String, String> dic)
        {
            String level;
            dic.TryGetValue("logLevel", out level);
            if (strUtil.IsNullOrEmpty(level)) return getDefaultLevel();
            try
            {
                return (LogLevel)Enum.Parse(typeof(LogLevel), level, true);
            }
            catch { return getDefaultLevel(); }
        }

        /// <summary>
        /// 获取默认级别
        /// </summary>
        /// <returns></returns>
        private static LogLevel getDefaultLevel()
        {
            return LogLevel.None;
        }

        private void loadDefault()
        {
            this.Level = LogLevel.Debug;
            this.FilePath = getAbsoluteLogPath(getFilePath(dic));
        }

        /// <summary>
        /// 获取配置文件路径
        /// </summary>
        /// <returns></returns>
        private static String getConfigAbsPath()
        {
            String absolutePath = PathHelper.Map(strUtil.Join(cfgHelper.ConfigRoot, "log.config"));
            if (!File.Exists(absolutePath))
            {
                absolutePath = null;
            }
            return absolutePath;
        }
        /// <summary>
        /// 日志输出配置
        /// </summary>
        /// <param name="dic"></param>
        /// <returns></returns>
        private static String getFilePath(Dictionary<String, String> dic)
        {
            String filePath;
            String logPath;
            dic.TryGetValue("logFile", out filePath);
            dic.TryGetValue("logPath", out logPath);
            filePath = getDefaultLogPath(filePath, logPath);
            return getAbsoluteLogPath(filePath);
        }

        /// <summary>
        /// 日志输出路径修改
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="logdir"></param>
        /// <returns></returns>
        private static String getDefaultLogPath(string filePath, string logdir)
        {
            if (!Directory.Exists(logdir))
            {
                Directory.CreateDirectory(logdir);
            }
            string logPath = logdir + "/" + DateTime.Now.ToString(filePath) + ".txt";
            return cfgHelper.FrameworkRoot + logPath;
        }

        private static String getAbsoluteLogPath(String path)
        {
            if (path.StartsWith(cfgHelper.FrameworkRoot) == false)
                path = strUtil.Join(cfgHelper.FrameworkRoot, path);
            return PathHelper.Map(path);
        }
        private static String getLoggerImpl(Dictionary<String, String> dic)
        {
            String logProvider;
            dic.TryGetValue("logProvider", out logProvider);
            return logProvider;
        }

        //---------------------------------------------------------------------------------------------
        /// <summary>
        /// 记录的层次，不区分大小写，有 none, debug, info, warn, error, fatal, all 这几种可选
        /// </summary>
        public LogLevel Level { get; set; }

        /// <summary>
        /// 日志文件存储的路径
        /// </summary>
        public String FilePath { get; set; }

        /// <summary>
        /// 日志记录工具，默认是 FileLogger
        /// </summary>
        public String LoggerImpl { get; set; }

    }

}