using NPoco;
using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.IO;
using NLog;

namespace POSV.Service
{
    public class Global
    {
        private static Logger logger = NLog.LogManager.GetCurrentClassLogger();

        private static object _lock = new object();

        private Dictionary<string , string> _globalConfig = null;

        private static Global _instance = null;

        public static Global Instance
        {
            get
            {
                if (_instance == null)
                {
                    lock (_lock)
                    {
                        _instance = new Global();

                        _instance.InitConfig();

                        logger.Info("加载全局配置参数......");
                    }
                }

                return _instance;
            }
        }

        public string DataBaseFullPath
        {
            get { return Path.Combine(AppDomain.CurrentDomain.BaseDirectory , @"data\msc.s3db"); }
        }

        public Database OpenDataBase
        {
            get
            {
                return new Database(Global.Instance.SQLiteConnectionString, DatabaseType.SQLite, SQLiteFactory.Instance);
            }
        }

        /// <summary>
        /// 通用操作锁
        /// </summary>
        public object SyncLock = new object();


        /// <summary>
        /// 全部重载
        /// </summary>
        public void ReloadConfig()
        {
            this.InitConfig();
        }
        
        public void InitConfig()
        {
            try
            {
                using (IDatabase db = Instance.OpenDataBase)
                {
                    this._globalConfig = db.Dictionary<string , string>("select [keys],[values] from [pos_config];");
                }

                if (this._globalConfig != null)
                {
                    logger.Debug("获取消息中心默认参数成功...");
                }
                else
                {
                    this._globalConfig = new Dictionary<string, string>();
                }
            }
            catch (Exception ex)
            {
                logger.Error(ex, "加载消息中心全局配置异常");
            }
        }

        public string GlobalConfigValue(string keys)
        {
            if (this._globalConfig.ContainsKey(keys))
            {
                return this._globalConfig[keys];
            }
            else
            {
                return null;
            }
        }

        public string GlobalConfigStringValue(string keys)
        {
            return GlobalConfigStringValue(keys , string.Empty);
        }

        public string GlobalConfigStringValue(string keys,string defaultValue)
        {
            if (this._globalConfig.ContainsKey(keys))
            {
                return this._globalConfig[keys];
            }
            else
            {
                return defaultValue;
            }
        }

        /// <summary>
        /// 加载配置参数，返回Int类型
        /// </summary>
        /// <param name="keys"></param>
        /// <returns></returns>
        public int GlobalConfigIntValue(string keys)
        {
            return GlobalConfigIntValue(keys , 0);
        }

        public int GlobalConfigIntValue(string keys , int defaultValue)
        {
            if (this._globalConfig.ContainsKey(keys))
            {
                int result = defaultValue;
                int.TryParse(this._globalConfig[keys] , out result);

                return result;
            }
            else
            {
                return defaultValue;
            }
        }

        public string SQLiteConnectionString
        {
            get
            {
                SQLiteConnectionStringBuilder builder = new SQLiteConnectionStringBuilder();
                builder.DataSource = Path.Combine(AppDomain.CurrentDomain.BaseDirectory , @"data\msc.s3db");
                //builder.Password = "passwd";
                builder.Version = 3;
                builder.CacheSize = 10000;
                builder.DefaultTimeout = 5000;
                //builder.PageSize = 4096;
                builder.FailIfMissing = true;
                builder.Pooling = true;
                //builder.DefaultIsolationLevel = System.Data.IsolationLevel.ReadCommitted;
                builder.SyncMode = SynchronizationModes.Off;
                builder.JournalMode = SQLiteJournalModeEnum.Truncate;
                builder.UseUTF16Encoding = false;

                return builder.ToString();
            }
        }

    }
}