using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Reflection;

namespace Mesnac.Maths
{
    public class Factory
    {
        #region 单例模式
        private static Factory _this;
        public static Factory Instance
        {
            get
            {
                if (null == _this)
                    _this = new Factory();
                return _this;
            }
        }
        private Factory()
        {
            this.AllMaths = new Dictionary<string, IMath>();
            GetMaths();
        }
        #endregion

        #region 属性
        public Dictionary<string, IMath> AllMaths { get; set; }
        #endregion

        public string GetMethodName(string method)
        {
            string ss = method.Replace(" ", "");
            if (ss.IndexOf("(") > 0)
            {
                return ss.Substring(0, ss.IndexOf("("));
            }
            return ss;
        }
        public string GetMethodParameter(string method)
        {
            string ss = method.Replace(" ", "");
            if (ss.IndexOf("(") >= 0)
            {
                ss = ss.Substring(ss.IndexOf("(") + 1);
            }
            else
            {
                return string.Empty;
            }
            if (ss.IndexOf(")") >= 0)
            {
                return ss.Substring(0, ss.IndexOf(")"));
            }
            return ss;
        }

        public string[] GetParameters(string parameters)
        {
            List<string> Result = new List<string>();
            string ss = parameters;
            while (true)
            {
                string parameter = string.Empty;
                if (ss.StartsWith("{"))
                {
                    parameter = ss.Substring(0, ss.IndexOf("}") + 1).Trim();
                    ss = ss.Substring(ss.IndexOf("}") + 1).Trim();
                }
                else if (ss.StartsWith("["))
                {
                    parameter = ss.Substring(0, ss.IndexOf("]") + 1).Trim();
                    ss = ss.Substring(ss.IndexOf("]") + 1).Trim();
                }
                else if (ss.StartsWith("("))
                {
                    parameter = ss.Substring(0, ss.IndexOf(")") + 1).Trim();
                    ss = ss.Substring(ss.IndexOf(")") + 1).Trim();
                }
                else if (ss.StartsWith("<"))
                {
                    parameter = ss.Substring(0, ss.IndexOf(">") + 1).Trim();
                    ss = ss.Substring(ss.IndexOf(">") + 1).Trim();
                }
                else if (ss.IndexOf(",") > 0)
                {
                    parameter = ss.Substring(0, ss.IndexOf(",")).Trim();
                    ss = ss.Substring(ss.IndexOf(",") + 1).Trim();
                }
                else
                {
                    parameter = ss.Replace(")", "").Replace(",", "");
                    ss = string.Empty;
                }
                if ((string.IsNullOrWhiteSpace(ss)) && (string.IsNullOrWhiteSpace(parameter)))
                {
                    break;
                }
                if (string.IsNullOrWhiteSpace(parameter))
                {
                    continue;
                }
                Result.Add(parameter);
            }
            return Result.ToArray();
        }
        public object Execute(string method, object[] buff)
        {
            string name = GetMethodName(method);
            if (string.IsNullOrWhiteSpace(name))
            {
                if (buff.Length == 1)
                {
                    return buff[0];
                }
                else
                {
                    return buff;
                }
            }
            string ps = GetMethodParameter(method);
            IMath math = null;
            this.AllMaths.TryGetValue(name, out math);
            if (math != null)
            {
                return math.Execute(GetParameters(ps), buff);
            }
            if (buff.Length > 0)
            {
                if (buff.Length == 1)
                {
                    return buff[0];
                }
                else
                {
                    return buff;
                }
            }
            return null;
        }

        private void GetMaths(FileInfo fi)
        {
            if (fi.Extension.ToLower() != ".dll")
            {
                return;
            }
            Assembly ass = Assembly.LoadFile(fi.FullName);
            if (ass == null)
            {
                return;
            }
            Type[] types = ass.GetTypes();
            foreach (Type t in types)
            {
                Type a = t.GetInterface(typeof(IMath).FullName);
                if (a != null)
                {
                    IMath m = (IMath)Activator.CreateInstance(t);
                    this.AllMaths.Add(m.Name, m);
                }
            }
        }

        private void GetMaths()
        {
            string path = this.GetType().Assembly.Location;
            //DirectoryInfo dir = new DirectoryInfo((new FileInfo(path)).Directory + "\\Mesnac.Maths\\");
            DirectoryInfo dir = new DirectoryInfo((new FileInfo(path)).Directory + "\\Data\\DeviceConfig\\Mesnac.Maths\\");

            FileInfo[] files = dir.GetFiles();
            foreach (FileInfo fi in files)
            {
                try
                {
                    GetMaths(fi);
                }
                catch (Exception ex)
                {
                    ICSharpCode.Core.LoggingService.Error(ex.Message);
                    ICSharpCode.Core.LoggingService.Error(ex.StackTrace);
                }
            }
        }
    }
}