using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Input;

namespace SunlightAggregationManager.UserClass
{
    internal class IniFile
    {
        public class IniFiles
        {
            public string path;
            [DllImport("kernel32")] //返回0表示失败，非0为成功
            private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
            [DllImport("kernel32")] //返回取得字符串缓冲区的长度
            private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
            /// <summary>
            /// 保存ini文件的路径
            /// 调用示例：var ini = IniFiles("C:\file.ini");
            /// </summary>
            /// <param name="INIPath"></param>
            public IniFiles(string iniPath)
            {
                this.path = iniPath;
            }
            /// <summary>
            /// 写Ini文件
            /// 调用示例：ini.IniWritevalue("Server","name","localhost");
            /// </summary>
            /// <param name="Section">[缓冲区]</param>
            /// <param name="Key">键</param>
            /// <param name="value">值</param>
            public void IniWritevalue(string Section, string Key, string? value)
            {
                // 确保路径有效
                if (!File.Exists(path))
                {
                    // 如果文件不存在，创建一个空的
                    using (FileStream fs = File.Create(path)) { }
                }

                // 处理 null 值，避免 API 调用出现问题
                string safeValue = value ?? string.Empty;

                long result = WritePrivateProfileString(Section, Key, safeValue, path);

                if (result==0)
                {
                    // 可以选择抛出异常或记录日志
                    // throw new Win32Exception(Marshal.GetLastWin32Error());
                }
            }
            /// <summary>
            /// 读Ini文件
            /// 调用示例：ini.IniWritevalue("Server","name");
            /// </summary>
            /// <param name="Section">[缓冲区]</param>
            /// <param name="Key">键</param>
            /// <returns>值</returns>
            public string IniReadvalue(string Section, string Key)
            {
                try
                {
                    if (!File.Exists(path))
                    {
                        return string.Empty;
                    }

                    var sb = new StringBuilder(4096);
                    GetPrivateProfileString(Section, Key, string.Empty, sb, sb.Capacity, path);
                    return sb.ToString();
                }
                catch (Exception) 
                {//错误返回0
                    return "0";
                }
            }

        }
    }
}