using System;
using System.Collections.Generic;
using Developpez.Dotnet.Collections;
using NUnit.Framework;

namespace Developpez.Dotnet.Tests.Collections
{
    [TestFixture(Description = "Tests unitaires pour la classe CompareExtensions")]
    public class CompareExtensionsTests
    {
        [Test(Description = "Vérifie le fonctionnement de la méthode ToComparison")]
        public void Check_ToComparison()
        {
            IComparer<string> comparer = Comparer<string>.Default;
            Comparison<string> comparison = comparer.ToComparison();
            string a = "Foo";
            string b = "Bar";
            int comparerResult = comparer.Compare(a, b);
            int comparisonResult = comparison(a, b);
            Assert.AreEqual(comparerResult, comparisonResult);
        }

        [Test(Description = "Vérifie le fonctionnement de la méthode ToComparer")]
        public void Check_ToComparer()
        {
            Comparison<string> comparison = (x,y) => string.Compare(x,y);
            IComparer<string> comparer = comparison.ToComparer();
            string a = "Foo";
            string b = "Bar";
            int comparerResult = comparer.Compare(a, b);
            int comparisonResult = comparison(a, b);
            Assert.AreEqual(comparerResult, comparisonResult);
        }

        [Test(Description = "Vérifie le fonctionnement de la méthode Reverse(Comparison<T>)")]
        public void Check_ReverseComparison()
        {
            Comparison<string> comparison = (x, y) => string.Compare(x, y);
            Comparison<string> reverse = comparison.Reverse();
            string a = "Foo";
            string b = "Bar";
            int comparisonResult = comparison(a, b);
            int reverseResult = reverse(a, b);
            Assert.AreEqual(comparisonResult, -reverseResult);
        }

        [Test(Description = "Vérifie le fonctionnement de la méthode Reverse(IComparer<T>)")]
        public void Check_ReverseComparer()
        {
            IComparer<string> comparer = Comparer<string>.Default;
            IComparer<string> reverse = comparer.Reverse();
            string a = "Foo";
            string b = "Bar";
            int comparerResult = comparer.Compare(a, b);
            int reverseResult = reverse.Compare(a, b);
            Assert.AreEqual(comparerResult, -reverseResult);
        }

        [Test(Description = "Vérifie le fonctionnement de la méthode Min")]
        public void Check_Min()
        {
            const int x = 42;
            const int y = 55;
            const int expected = x;
            int actual = Comparer<int>.Default.Min(x, y);
            Assert.AreEqual(expected, actual);
        }

        [Test(Description = "Vérifie le fonctionnement de la méthode Max")]
        public void Check_Max()
        {
            const int x = 42;
            const int y = 18;
            const int expected = x;
            int actual = Comparer<int>.Default.Max(x, y);
            Assert.AreEqual(expected, actual);
        }

    }
}