﻿// The MIT License (MIT)
// 
// Copyright (c) 2014-2017, Institute for Software & Systems Engineering
// 
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// 
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namespace Tests.Execution.StateMachines
{
	using SafetySharp.Modeling;
	using Shouldly;
	using Utilities;

	internal class ConflictingVariables : TestObject
	{
		private readonly StateMachine<S> _stateMachine = new StateMachine<S>(S.A);
		private int _x;
		private int _y;

		protected override void Check()
		{
			Transition();
			(_stateMachine == S.B).ShouldBe(true);
			_x.ShouldBe(0);
			_y.ShouldBe(8);

			Transition();
			(_stateMachine == S.A).ShouldBe(true);
			_x.ShouldBe(0);
			_y.ShouldBe(4);
		}

		private void Transition()
		{
			_stateMachine
				.Transition(
					from: S.A,
					to: S.B,
					action: () =>
					{
						var _x = 4;
						var x = _x / 2;
						_x += x;
						_y = _x + x;
					})
				.Transition(
					from: S.B,
					to: S.A,
					action: () =>
					{
						var _x = 2;
						var x = _x / 2;
						_x += x;
						_y = _x + x;
					});
		}

		private enum S
		{
			A,
			B,
			C
		}
	}
}