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

namespace CPF.Mac.CoreFoundation
{
	[Since(3, 2)]
	internal class CFDictionary : INativeObject, IDisposable
	{
		public static IntPtr KeyCallbacks;

		public static IntPtr ValueCallbacks;

		public IntPtr Handle
		{
			get;
			private set;
		}

		public int Count => CFDictionaryGetCount(Handle);

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

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

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

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

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

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

		static CFDictionary()
		{
			IntPtr handle = Dlfcn.dlopen("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation", 0);
			try
			{
				KeyCallbacks = Dlfcn.GetIndirect(handle, "kCFTypeDictionaryKeyCallBacks");
				ValueCallbacks = Dlfcn.GetIndirect(handle, "kCFTypeDictionaryValueCallBacks");
			}
			finally
			{
				Dlfcn.dlclose(handle);
			}
		}

		public static CFDictionary FromObjectAndKey(INativeObject obj, INativeObject key)
		{
			return new CFDictionary(CFDictionaryCreate(IntPtr.Zero, new IntPtr[1]
			{
				key.Handle
			}, new IntPtr[1]
			{
				obj.Handle
			}, 1, KeyCallbacks, ValueCallbacks), owns: true);
		}

		public static CFDictionary FromObjectsAndKeys(INativeObject[] objects, INativeObject[] keys)
		{
			if (objects == null)
			{
				throw new ArgumentNullException("objects");
			}
			if (keys == null)
			{
				throw new ArgumentNullException("keys");
			}
			if (objects.Length != keys.Length)
			{
				throw new ArgumentException("The length of both arrays must be the same");
			}
			IntPtr[] array = new IntPtr[keys.Length];
			IntPtr[] array2 = new IntPtr[keys.Length];
			for (int i = 0; i < array.Length; i++)
			{
				array[i] = keys[i].Handle;
				array2[i] = objects[i].Handle;
			}
			return new CFDictionary(CFDictionaryCreate(IntPtr.Zero, array, array2, array.Length, KeyCallbacks, ValueCallbacks), owns: true);
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDictionaryCreate(IntPtr allocator, IntPtr[] keys, IntPtr[] vals, int len, IntPtr keyCallbacks, IntPtr valCallbacks);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFDictionaryGetValue(IntPtr theDict, IntPtr key);

		public static IntPtr GetValue(IntPtr theDict, IntPtr key)
		{
			return CFDictionaryGetValue(theDict, key);
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern int CFDictionaryGetCount(IntPtr theDict);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern void CFDictionaryGetKeysAndValues(IntPtr theDict, IntPtr[] keys, IntPtr[] values);

		public void GetKeysAndValues(out IntPtr[] keys, out IntPtr[] values)
		{
			int count = Count;
			keys = new IntPtr[count];
			values = new IntPtr[count];
			CFDictionaryGetKeysAndValues(Handle, keys, values);
		}

		public static bool GetBooleanValue(IntPtr theDict, IntPtr key)
		{
			IntPtr value = GetValue(theDict, key);
			if (value == IntPtr.Zero)
			{
				return false;
			}
			return CFBoolean.GetValue(value);
		}

		public string GetStringValue(string key)
		{
			using (CFString cFString = new CFString(key))
			{
				return CFString.FetchString(CFDictionaryGetValue(Handle, cFString.handle));
			}
		}

		public int GetInt32Value(string key)
		{
			int value = 0;
			using (CFString cFString = new CFString(key))
			{
				if (!CFNumberGetValue(CFDictionaryGetValue(Handle, cFString.Handle), 3, out value))
				{
					throw new KeyNotFoundException($"Key {key} not found");
				}
				return value;
			}
		}

		public long GetInt64Value(string key)
		{
			long value = 0L;
			using (CFString cFString = new CFString(key))
			{
				if (!CFNumberGetValue(CFDictionaryGetValue(Handle, cFString.Handle), 4, out value))
				{
					throw new KeyNotFoundException($"Key {key} not found");
				}
				return value;
			}
		}

		public IntPtr GetIntPtrValue(string key)
		{
			using (CFString cFString = new CFString(key))
			{
				return CFDictionaryGetValue(Handle, cFString.handle);
			}
		}

		public CFDictionary GetDictionaryValue(string key)
		{
			using (CFString cFString = new CFString(key))
			{
				IntPtr intPtr = CFDictionaryGetValue(Handle, cFString.handle);
				return (intPtr == IntPtr.Zero) ? null : new CFDictionary(intPtr);
			}
		}

		public bool ContainsKey(string key)
		{
			using (CFString cFString = new CFString(key))
			{
				return CFDictionaryContainsKey(Handle, cFString.handle);
			}
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern bool CFNumberGetValue(IntPtr number, int theType, out int value);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern bool CFNumberGetValue(IntPtr number, int theType, out long value);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern bool CFDictionaryContainsKey(IntPtr theDict, IntPtr key);
	}
}