using CPF.Mac.ObjCRuntime;
using System;
using System.Runtime.InteropServices;

namespace CPF.Mac.CoreFoundation
{
	internal class CFData : INativeObject, IDisposable
	{
		internal IntPtr handle;

		public IntPtr Handle => handle;

		public int Length => CFDataGetLength(handle);

		public IntPtr Bytes => CFDataGetBytePtr(handle);

		public CFData(IntPtr handle)
			: this(handle, owns: false)
		{
		}

		public CFData(IntPtr handle, bool owns)
		{
			if (!owns)
			{
				CFObject.CFRetain(handle);
			}
			this.handle = handle;
		}

		~CFData()
		{
			Dispose(disposing: false);
		}

		public void Dispose()
		{
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation", EntryPoint = "CFDataGetTypeID")]
		public static extern int GetTypeID();

		protected virtual void Dispose(bool disposing)
		{
			if (handle != IntPtr.Zero)
			{
				CFObject.CFRelease(handle);
				handle = IntPtr.Zero;
			}
		}

		public static CFData FromDataNoCopy(IntPtr buffer, int length)
		{
			return new CFData(CFDataCreateWithBytesNoCopy(IntPtr.Zero, buffer, length, CFAllocator.null_ptr), owns: true);
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDataCreateWithBytesNoCopy(IntPtr allocator, IntPtr bytes, int len, IntPtr deallocator);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern CFIndex CFDataGetLength(IntPtr data);

		public byte[] GetBuffer()
		{
			byte[] array = new byte[Length];
			Marshal.Copy(CFDataGetBytePtr(handle), array, 0, array.Length);
			return array;
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDataGetBytePtr(IntPtr data);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDataCreate(IntPtr allocator, IntPtr bytes, CFIndex len);

		public static CFData FromData(IntPtr buffer, int length)
		{
			return new CFData(CFDataCreate(IntPtr.Zero, buffer, length), owns: true);
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDataCreateCopy(IntPtr allocator, IntPtr data);

		public CFData Copy()
		{
			return new CFData(CFDataCreateCopy(IntPtr.Zero, Handle), owns: true);
		}
	}
}