using System.Runtime.InteropServices;
using System.Text;

namespace EC.Utils.Storage
{
	public class IniFileHelper
	{
		private string FileName { get; set; }

		[DllImport("kernel32.dll")]
		private static extern int GetPrivateProfileInt(
			string lpAppName,
			string lpKeyName,
			int nDefault,
			string lpFileName
			);

		[DllImport("kernel32.dll")]
		private static extern int GetPrivateProfileString(
			string lpAppName,
			string lpKeyName,
			string lpDefault,
			StringBuilder lpReturnedString,
			int nSize,
			string lpFileName
			);

		[DllImport("kernel32.dll")]
		private static extern int WritePrivateProfileString(
			string lpAppName,
			string lpKeyName,
			string lpString,
			string lpFileName
			);

		/// <summary>
		/// 构造函数
		/// </summary>
		public IniFileHelper()
		{
		}

		/// <summary>
		/// 构造函数
		/// </summary>
		/// <param name="fileName">Ini文件路径</param>
		public IniFileHelper(string fileName)
		{
			this.FileName = fileName;
		}

		/// <summary>
		/// 读取指定 节-键 的值
		/// </summary>
		/// <param name="section"></param>
		/// <param name="name"></param>
		/// <returns></returns>
		public string IniReadValue(string section, string name)
		{
			StringBuilder strSb = new StringBuilder(256);
			GetPrivateProfileString(section, name, "", strSb, 256, this.FileName);
			return strSb.ToString();
		}

		/// <summary>
		/// 写入指定值，如果不存在 节-键，则会自动创建
		/// </summary>
		/// <param name="section"></param>
		/// <param name="name"></param>
		/// <param name="value"></param>
		public void IniWriteValue(string section, string name, string value)
		{
			WritePrivateProfileString(section, name, value, this.FileName);
		}

		/// <summary>
		/// [扩展]读取string字符串
		/// </summary>
		/// <param name="section">节</param>
		/// <param name="name">键</param>
		/// <param name="def">默认值</param>
		/// <returns></returns>
		public string ReadString(string section, string name, string def)
		{
			StringBuilder vRetSb = new StringBuilder(2048);
			GetPrivateProfileString(section, name, def, vRetSb, 2048, this.FileName);
			return vRetSb.ToString();
		}

		/// <summary>
		/// [扩展]写入String字符串，如果不存在 节-键，则会自动创建
		/// </summary>
		/// <param name="section">节</param>
		/// <param name="name">键</param>
		/// <param name="strVal">写入值</param>
		public void WriteString(string section, string name, string strVal)
		{
			WritePrivateProfileString(section, name, strVal, this.FileName);
		}

		/// <summary>
		/// [扩展]读Int数值
		/// </summary>
		/// <param name="section">节</param>
		/// <param name="name">键</param>
		/// <param name="def">默认值</param>
		/// <returns></returns>
		public int ReadInt(string section, string name, int def)
		{
			return GetPrivateProfileInt(section, name, def, this.FileName);
		}

		/// <summary>
		/// [扩展]写入Int数值，如果不存在 节-键，则会自动创建
		/// </summary>
		/// <param name="section">节</param>
		/// <param name="name">键</param>
		/// <param name="intVal">写入值</param>
		public void WriteInt(string section, string name, int intVal)
		{
			WritePrivateProfileString(section, name, intVal.ToString(), this.FileName);
		}

		/// <summary>
		/// 删除指定的 节
		/// </summary>
		/// <param name="section"></param>
		public void DeleteSection(string section)
		{
			WritePrivateProfileString(section, null, null, this.FileName);
		}

		/// <summary>
		/// 删除全部 节
		/// </summary>
		public void DeleteAllSection()
		{
			WritePrivateProfileString(null, null, null, this.FileName);
		}
	}
}