using System;
using System.Runtime.InteropServices;
using Facepunch.Steamworks.Data;

namespace Facepunch.Steamworks.Ugc
{
	internal struct SteamParamStringArray : IDisposable
	{
		public SteamParamStringArray_t Value;

		IntPtr[] NativeStrings;
		IntPtr NativeArray;

		public static SteamParamStringArray From( string[] array )
		{
			var a = new SteamParamStringArray();

			a.NativeStrings = new IntPtr[array.Length];
			for ( int i = 0; i < a.NativeStrings.Length; i++ )
			{
				a.NativeStrings[i] = Marshal.StringToHGlobalAnsi( array[i] );
			}

			var size = Marshal.SizeOf( typeof( IntPtr ) ) * a.NativeStrings.Length;
			a.NativeArray = Marshal.AllocHGlobal( size );
			Marshal.Copy( a.NativeStrings, 0, a.NativeArray, a.NativeStrings.Length );

			a.Value = new SteamParamStringArray_t
			{
				Strings = a.NativeArray,
				NumStrings = array.Length
			};

			return a;			
		}

		public void Dispose()
		{
			foreach ( var x in NativeStrings )
				Marshal.FreeHGlobal( x );

			Marshal.FreeHGlobal( NativeArray );
		}
	}
}