using CPF.Mac.CoreFoundation;
using CPF.Mac.Foundation;
using CPF.Mac.ObjCRuntime;
using System;
using System.Collections.Generic;

namespace CPF.Mac.CoreText
{
	internal static class Adapter
	{
		public static void AssertWritable(NSDictionary dictionary)
		{
			if (!(dictionary is NSMutableDictionary))
			{
				throw new NotSupportedException();
			}
		}

		public static int? BitwiseOr(int? a, int? b)
		{
			if (!a.HasValue)
			{
				return b;
			}
			return a.Value | (b ?? 0);
		}

		public static uint? BitwiseOr(uint? a, uint? b)
		{
			if (!a.HasValue)
			{
				return b;
			}
			return a.Value | (b ?? 0);
		}

		public static int? GetInt32Value(IDictionary<NSObject, NSObject> dictionary, NSObject key)
		{
			NSObject nSObject = dictionary[key];
			if (nSObject == null)
			{
				return null;
			}
			return ((NSNumber)nSObject).Int32Value;
		}

		public static T[] GetNativeArray<T>(NSDictionary dictionary, NSObject key, Converter<IntPtr, T> converter)
		{
			IntPtr value = CFDictionary.GetValue(dictionary.Handle, key.Handle);
			if (value == IntPtr.Zero || CFArray.GetCount(value) == 0)
			{
				return new T[0];
			}
			return NSArray.ArrayFromHandle(value, converter);
		}

		public static float? GetSingleValue(IDictionary<NSObject, NSObject> dictionary, NSObject key)
		{
			NSObject nSObject = dictionary[key];
			if (nSObject == null)
			{
				return null;
			}
			return ((NSNumber)nSObject).FloatValue;
		}

		public static string[] GetStringArray(IDictionary<NSObject, NSObject> dictionary, NSObject key)
		{
			NSObject nSObject = dictionary[key];
			if (nSObject == null)
			{
				return new string[0];
			}
			return NSArray.StringArrayFromHandle(nSObject.Handle);
		}

		public static string GetStringValue(IDictionary<NSObject, NSObject> dictionary, NSObject key)
		{
			NSObject nSObject = dictionary[key];
			if (nSObject == null)
			{
				return null;
			}
			return ((NSString)nSObject).ToString();
		}

		public static uint? GetUInt32Value(IDictionary<NSObject, NSObject> dictionary, NSObject key)
		{
			NSObject nSObject = dictionary[key];
			if (nSObject == null)
			{
				return null;
			}
			return ((NSNumber)nSObject).UInt32Value;
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, int? value)
		{
			if (value.HasValue)
			{
				dictionary[key] = new NSNumber(value.Value);
			}
			else
			{
				dictionary.Remove(key);
			}
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, float? value)
		{
			if (value.HasValue)
			{
				dictionary[key] = new NSNumber(value.Value);
			}
			else
			{
				dictionary.Remove(key);
			}
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, uint? value)
		{
			if (value.HasValue)
			{
				dictionary[key] = new NSNumber(value.Value);
			}
			else
			{
				dictionary.Remove(key);
			}
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, IEnumerable<string> value)
		{
			List<string> list;
			if (value == null || (list = new List<string>(value)).Count == 0)
			{
				SetValue(dictionary, key, (NSObject)null);
			}
			else
			{
				using (NSArray value2 = NSArray.FromStrings(list.ToArray()))
				{
					SetValue(dictionary, key, value2);
				}
			}
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, NSObject value)
		{
			if (value != null)
			{
				dictionary[key] = value;
			}
			else
			{
				dictionary.Remove(key);
			}
		}

		public static void SetValue(IDictionary<NSObject, NSObject> dictionary, NSObject key, string value)
		{
			if (value == null)
			{
				SetValue(dictionary, key, (NSObject)null);
			}
			else
			{
				using (NSString value2 = new NSString(value))
				{
					SetValue(dictionary, key, (NSObject)value2);
				}
			}
		}

		public static void SetNativeValue<T>(NSDictionary dictionary, NSObject key, IEnumerable<T> value) where T : INativeObject
		{
			List<IntPtr> handles;
			if (value == null || (handles = GetHandles(value)).Count == 0)
			{
				SetNativeValue(dictionary, key, null);
			}
			else
			{
				using (CFArray value2 = CFArray.FromIntPtrs(handles.ToArray()))
				{
					SetNativeValue(dictionary, key, value2);
				}
			}
		}

		private static List<IntPtr> GetHandles<T>(IEnumerable<T> value) where T : INativeObject
		{
			List<IntPtr> list = new List<IntPtr>();
			foreach (T item in value)
			{
				list.Add(item.Handle);
			}
			return list;
		}

		public static void SetNativeValue(NSDictionary dictionary, NSObject key, INativeObject value)
		{
			if (value != null)
			{
				AssertWritable(dictionary);
				CFMutableDictionary.SetValue(dictionary.Handle, key.Handle, value.Handle);
			}
			else
			{
				((IDictionary<NSObject, NSObject>)dictionary).Remove(key);
			}
		}
	}
}