// iniFile.cs
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX - FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
// https://github.com/gnh1201/welsonjs
// 
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace WelsonJS
{
    public class IniFile
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
        static extern long WritePrivateProfileString(string section, string key, string value, string FilePath);

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
        static extern int GetPrivateProfileString(string section, string key, string Default, StringBuilder RetVal, int Size, string FilePath);

        private readonly FileInfo FileInfo;

        //private readonly string exe = Assembly.GetExecutingAssembly().GetName().Name;
        private readonly string defaultSection = "Default";

        private readonly FileAccess fileAccess;

        public IniFile(string path = null, FileAccess access = FileAccess.ReadWrite)
        {
            fileAccess = access;
            FileInfo = new FileInfo(path ?? defaultSection);
        }

        public string Read(string key, string section = null)
        {
            var RetVal = new StringBuilder(65025);

            if (fileAccess != FileAccess.Write)
            {
                GetPrivateProfileString(section ?? defaultSection, key, "", RetVal, 65025, FileInfo.FullName);
            }
            else
            {
                throw new Exception("Can`t read file! No access!");
            }

            return RetVal.ToString();
        }
        public void Write(string key, string value, string section = null)
        {
            if (fileAccess != FileAccess.Read)
            {
                WritePrivateProfileString(section ?? defaultSection, key, value, FileInfo.FullName);
            }
            else
            {
                throw new Exception("Can`t write to file! No access!");
            }
        }

        public void DeleteKey(string key, string section = null)
        {
            Write(key, null, section ?? defaultSection);
        }

        public void DeleteSection(string section = null)
        {
            Write(null, null, section ?? defaultSection);
        }

        public bool KeyExists(string key, string section = null)
        {
            return Read(key, section).Length > 0;
        }
    }
}

/* References:
 * [1] GitHub - A simple class on C# for read/write ini files, niklyadov/tiny-ini-file-class
 *     https://github.com/niklyadov/tiny-ini-file-class
 */