using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;

namespace Katteker.AppStub
{
    public class IniFile   // revision 11
    {
        private readonly FileInfo _path;
        private readonly string _exe = Assembly.GetExecutingAssembly().GetName().Name;

        [DllImport("kernel32", CharSet = CharSet.Unicode)]
        private static extern long WritePrivateProfileString(string section, string key, string value, string filePath);

        [DllImport("kernel32", CharSet = CharSet.Unicode)]
        private static extern int GetPrivateProfileString(string section, string key, string Default, StringBuilder retVal, int size, string filePath);

        public IniFile(string iniPath = null)
        {
            _path = new FileInfo(iniPath ?? _exe + ".ini");
        }

        public string Read(string key, string section = null)
        {
            var retVal = new StringBuilder(255);
            GetPrivateProfileString(section ?? _exe, key, "", retVal, 255, _path.FullName);
            return retVal.ToString();
        }

        public void Write(string key, string value, string section = null)
        {
            WritePrivateProfileString(section ?? _exe, key, value, _path.FullName);
        }

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

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

        public bool Exists => _path.Exists;

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