using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Foundations.UnitTests
{
    public class ThreadsafeBoolTests : UnitTestSharp.TestFixture
    {
        public void BlankInitializationIsFalse()
        {
            var test = new ThreadsafeBool();
            CheckFalse(test);
        }

        public void InitialValueIsSet_True()
        {
            var test = new ThreadsafeBool(true);
            CheckTrue(test);
        }

        public void InitialValueIsSet_False()
        {
            var test = new ThreadsafeBool(false);
            CheckFalse(test);
        }

        public void Set_SetsValue_True()
        {
            var test = new ThreadsafeBool();
            test.Set(true);
            CheckTrue(test);
        }

        public void Set_SetsValue_False()
        {
            var test = new ThreadsafeBool(true);
            test.Set(false);
            CheckFalse(test);
        }

        public void Set_TriggersOnChangedWhenDifferent()
        {
            var test = new ThreadsafeBool();
            bool? value = null;
            test.OnChanged += newValue => value = newValue;
            test.Set(true);
            CheckTrue(value.Value);
        }

        public void Set_DoesNotTriggerOnChangedWhenSame()
        {
            var test = new ThreadsafeBool(true);
            bool? value = null;
            test.OnChanged += newValue => value = newValue;
            test.Set(true);
            CheckNull(value);
        }

        public void Set_ReturnsOldValueWhenChanged()
        {
            var test = new ThreadsafeBool();
            CheckFalse(test.Set(true));
        }

        public void Set_ReturnsOldValueWhenNotChanged()
        {
            var test = new ThreadsafeBool();
            CheckFalse(test.Set(false));
        }

        public void PulseChangeEvent()
        {
            var test = new ThreadsafeBool(true);
            bool? value = null;
            test.OnChanged += newValue => value = newValue;
            test.PulseChangeEvent();
            CheckTrue(value.Value);
        }

        public void Toggle_True()
        {
            var test = new ThreadsafeBool();
            test.Toggle();
            CheckTrue(test);
        }

        public void Toggle_False()
        {
            var test = new ThreadsafeBool(initialValue: true);
            test.Toggle();
            CheckFalse(test);
        }

        public void Toggle_TriggersOnChanged_True()
        {
            var test = new ThreadsafeBool();
            bool? value = null;
            test.OnChanged += newValue => value = newValue;
            test.Toggle();
            CheckEqual(true, value);
        }

        public void Toggle_TriggersOnChanged_False()
        {
            var test = new ThreadsafeBool(initialValue: true);
            bool? value = null;
            test.OnChanged += newValue => value = newValue;
            test.Toggle();
            CheckEqual(false, value);
        }

        public void Toggle_ReturnsOldValue_True()
        {
            var test = new ThreadsafeBool(initialValue: true);
            CheckTrue(test.Toggle());
        }

        public void Toggle_ReturnsOldValue_False()
        {
            var test = new ThreadsafeBool(initialValue: false);
            CheckFalse(test.Toggle());
        }

        public class PropertyChangedEventTests : UnitTestSharp.TestFixture
        {
            public void ToggleTriggersPropertyChanged()
            {
                var test = new ThreadsafeBool(initialValue: false);
                bool propertyChanged = false;
                test.PropertyChanged += (sender, args) =>
                {
                    propertyChanged = true;
                };

                test.Toggle();
                Check(propertyChanged);
            }

            public void SetTriggersPropertyChanged()
            {
                var test = new ThreadsafeBool(initialValue: false);
                bool propertyChanged = false;
                test.PropertyChanged += (sender, args) =>
                {
                    propertyChanged = true;
                };

                test.Set(true);
                Check(propertyChanged);
            }

            public void SetDoesNotTriggersPropertyChangedIfNotChanged()
            {
                var test = new ThreadsafeBool(initialValue: false);
                bool propertyChanged = false;
                test.PropertyChanged += (sender, args) =>
                {
                    propertyChanged = true;
                };

                test.Set(false);
                CheckFalse(propertyChanged);
            }

            public void PulseChangeEventTriggersPropertyChanged()
            {
                var test = new ThreadsafeBool(initialValue: false);
                bool propertyChanged = false;
                test.PropertyChanged += (sender, args) =>
                {
                    propertyChanged = true;
                };

                test.PulseChangeEvent();
                Check(propertyChanged);
            }
        }
    }
}