using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using System.Xml.Linq;

namespace GeoSigma.SigmaDrawerUtil
{
    public class XmlConfig
    {
        public virtual string SectionName { get; set; }
        public string FileName; //INI文件名
 
        string fileName = "\\SigmaConfig.xml";
        XDocument xmlDoc;
        private XElement sectionElement;
        /// <summary>
        /// 构造函数
        /// </summary>
        public XmlConfig()
        {
            if(string.IsNullOrEmpty(SectionName))
            {
                return;
            }
            var path = Application.StartupPath;
            var strXmlFile = path + fileName;

            if (!File.Exists(strXmlFile))
            {
                xmlDoc = new XDocument();
            }
            else
            {
                xmlDoc = XDocument.Load(strXmlFile);
            }
            
            // 取到根结点
            XElement rootEle = xmlDoc.Element("Config");
            if(rootEle == null)
            {
                xmlDoc.Add(new XElement("Config"));
                rootEle = xmlDoc.Element("Config");
            }
            sectionElement = rootEle.Element(SectionName);
            if (sectionElement == null)
            {
                rootEle.Add(new XElement(SectionName));
                sectionElement = rootEle.Element(SectionName);
            }
        }
        /// <summary>
        /// 相关属性
        /// </summary>
        public virtual void ResetAttributes()
        {
            if (SectionAttributes != null && SectionAttributes.Count > 0)
            {
                for (int i = 0; i < SectionAttributes.Count; i++)
                {
                    XAttribute attr = sectionElement.Attribute(SectionAttributes[i].Name);
                    if (attr != null)
                    {
                        attr.Value = SectionAttributes[i].Value;
                    }
                    else
                    {
                        sectionElement.Add(SectionAttributes[i]);
                    }
                }
            }
        }
        public List<XAttribute> SectionAttributes
        {
            get;
            set;
        } = new List<XAttribute>();
        public string GetValue(string key)
        {
            string strValue = sectionElement.Element(key)?.Value;
            return strValue;
        }

        public void SetValue(string key, string value)
        {
            XElement ele = sectionElement.Element(key);
            if(ele == null)
            {
                sectionElement.Add(new XElement(key, value));
            }
            else
            {
                ele.Value = value;
            }
        }

        public void ResetValues(string key, List<string> values)
        {
            List<XElement> elements = sectionElement.Elements(key).ToList();
            for(int i = 0; i < elements.Count; i++)
            {
                elements[i].Remove();
            }
            foreach(string eleValue in values)
            {
                sectionElement.Add(new XElement(key, eleValue));
            }
        }

        public void Save()
        {
            var path = Application.StartupPath;
            var strXmlFile = path + fileName;
            xmlDoc?.Save(strXmlFile);
        }
        /// <summary>
        /// 查找所有指定键对应的值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public List<string> FindValues(string key)
        {
            IEnumerable<string> eles = 
                from ele in sectionElement.Elements()
                where ele.Name.ToString().Equals(key)
                select ele.Value;
            return eles?.ToList();
        }

        ////写INI文件
        //public void WriteString(string Section, string Ident, string Value)
        //{
        //    if (!WritePrivateProfileString(Section, Ident, Value, FileName))
        //    {

        //        throw (new ApplicationException("写Ini文件出错"));
        //    }
        //}

        ////读取INI文件指定
        //public string ReadString(string Section, string Ident, string Default)
        //{
        //    Byte[] Buffer = new Byte[65535];
        //    int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.GetUpperBound(0), FileName);
        //    //必须设定0（系统默认的代码页）的编码方式，否则无法支持中文
        //    string s = Encoding.GetEncoding(0).GetString(Buffer);
        //    s = s.Substring(0, bufLen);
        //    return s.Trim();
        //}

        ////读整数
        //public int ReadInteger(string Section, string Ident, int Default)
        //{
        //    string intStr = ReadString(Section, Ident, Convert.ToString(Default));
        //    try
        //    {
        //        return Convert.ToInt32(intStr);
        //    }
        //    catch (Exception ex)
        //    {
        //        Console.WriteLine(ex.Message);
        //        return Default;
        //    }
        //}

        ////写整数
        //public void WriteInteger(string Section, string Ident, int Value)
        //{
        //    WriteString(Section, Ident, Value.ToString());
        //}

        ////读布尔
        //public bool ReadBool(string Section, string Ident, bool Default)
        //{
        //    try
        //    {
        //        return Convert.ToBoolean(ReadString(Section, Ident, Convert.ToString(Default)));
        //    }
        //    catch (Exception ex)
        //    {
        //        Console.WriteLine(ex.Message);
        //        return Default;
        //    }
        //}

        ////写Bool
        //public void WriteBool(string Section, string Ident, bool Value)
        //{
        //    WriteString(Section, Ident, Convert.ToString(Value));
        //}

        ////从Ini文件中，将指定的Section名称中的所有Ident添加到列表中
        //public void ReadSection(string section, StringCollection Idents)
        //{
        //    Byte[] Buffer = new Byte[16384];
        //    //Idents.Clear();

        //    int bufLen = GetPrivateProfileString(section, null, null, Buffer, Buffer.GetUpperBound(0), FileName);
        //    //对Section进行解析
        //    GetStringsFromBuffer(Buffer, bufLen, Idents);
        //}

        //private void GetStringsFromBuffer(Byte[] Buffer, int bufLen, StringCollection Strings)
        //{
        //    Strings.Clear();
        //    if (bufLen != 0)
        //    {
        //        int start = 0;
        //        for (int i = 0; i < bufLen; i++)
        //        {
        //            if ((Buffer[i] == 0) && ((i - start) > 0))
        //            {
        //                String s = Encoding.GetEncoding(0).GetString(Buffer, start, i - start);
        //                Strings.Add(s);
        //                start = i + 1;
        //            }
        //        }
        //    }
        //}

        ////从Ini文件中，读取所有的Sections的名称
        //public void ReadSections(StringCollection SectionList)
        //{
        //    //Note:必须得用Bytes来实现，StringBuilder只能取到第一个Section
        //    byte[] Buffer = new byte[65535];
        //    int bufLen = 0;
        //    bufLen = GetPrivateProfileString(null, null, null, Buffer,
        //    Buffer.GetUpperBound(0), FileName);
        //    GetStringsFromBuffer(Buffer, bufLen, SectionList);
        //}

        ////读取指定的Section的所有Value到列表中
        //public void ReadSectionValues(string Section, NameValueCollection Values)
        //{
        //    StringCollection KeyList = new StringCollection();
        //    ReadSection(Section, KeyList);
        //    Values.Clear();
        //    foreach (string key in KeyList)
        //    {
        //        Values.Add(key, ReadString(Section, key, ""));
        //    }
        //}

        ////清除某个Section
        //public void EraseSection(string Section)
        //{
        //    if (!WritePrivateProfileString(Section, null, null, FileName))
        //    {
        //        throw (new ApplicationException("无法清除Ini文件中的Section"));
        //    }
        //}

        ////删除某个Section下的键
        //public void DeleteKey(string Section, string Ident)
        //{
        //    WritePrivateProfileString(Section, Ident, null, FileName);
        //}

        ////Note:对于Win9X，来说需要实现UpdateFile方法将缓冲中的数据写入文件
        ////在Win NT, 2000和XP上，都是直接写文件，没有缓冲，所以，无须实现UpdateFile
        ////执行完对Ini文件的修改之后，应该调用本方法更新缓冲区。
        //public void UpdateFile()
        //{
        //    WritePrivateProfileString(null, null, null, FileName);
        //}

        ////检查某个Section下的某个键值是否存在
        //public bool ValueExists(string Section, string Ident)
        //{
        //    StringCollection Idents = new StringCollection();
        //    ReadSection(Section, Idents);
        //    return Idents.IndexOf(Ident) > -1;
        //}

        ////确保资源的释放
        //~Config()
        //{
        //    UpdateFile();
        //}
    }
}