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// 
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// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;

namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
{
	public class OutVariables
	{
		public static void OutVarInShortCircuit(Dictionary<int, string> d)
		{
			if (d.Count > 2 && d.TryGetValue(42, out var value))
			{
				Console.WriteLine(value);
			}
		}

		public static Action CapturedOutVarInShortCircuit(Dictionary<int, string> d)
		{
			// Note: needs reasoning about "definitely assigned if true"
			// to ensure that the value is initialized when the delegate is declared.
			if (d.Count > 2 && d.TryGetValue(42, out var value))
			{
				return () => {
					Console.WriteLine(value);
				};
			}
			return null;
		}

		private bool TryGet<T>(out T result)
		{
			result = default;
			return true;
		}

		public void M3()
		{
			TryGet<Dictionary<int, (int, string)>>(out Dictionary<int, (int A, string B)> data);

			Test();

			int Test()
			{
				return data[0].A;
			}
		}

		public void GetObject(out object obj)
		{
			obj = null;
		}

		public void M4()
		{
			GetObject(out dynamic obj);
			obj.Method();
		}

		public void M5()
		{
			Func<bool> func = () => TryGet<object>(out var result) && result != null;
			Func<bool> func2 = () => TryGet<object>(out var result) && result != null;

			func();
			func2();
		}

		public static void CapturedBoolResult(Dictionary<int, int> d, int key)
		{
			// The boolean result of the out-returning call is captured into a local, yet the out
			// parameter is still promoted to an inline 'out var' rather than a separate declaration.
			bool value = d.TryGetValue(key, out var value2);
			Console.WriteLine(value);
			Console.WriteLine(value);
			Console.WriteLine(value2);
			Console.WriteLine(value2);
		}

		private static void GetTwo(out int a, out int b)
		{
			a = 1;
			b = 2;
		}

		public static void SameVariableUsedForTwoOutParameters()
		{
			// The declaration must use the explicit type: referencing an implicitly-typed
			// out variable in another argument of the declaring call is an error (CS8196).
			GetTwo(out int a, out a);
		}

		public static int SameVariableUsedForTwoOutParametersAndRead()
		{
			GetTwo(out int a, out a);
			return a;
		}

		private static void OutAndValue(out int a, int b)
		{
			a = b;
		}

		private static int UseAndReturn(out int a)
		{
			a = 1;
			return a;
		}

		public static void SameVariableUsedInNestedCallArgument()
		{
			// CS8196 also applies when the second reference is nested within
			// another argument of the declaring call.
			OutAndValue(out int a, UseAndReturn(out a));
			Console.WriteLine(a);
		}
	}
}