using System.Collections.Immutable;
using System.Linq;
using UnitTestSharp;

namespace Ariadne.Generator.UnitTests
{
    public class ArcCompositionTests : TestFixture
    {
        public static ArcComposition Variant(string fileName = "A.CodeBehind.cs", string message = "Message")
        {
            return new ArcComposition(
                new EquatableArray<ArcFile>(ImmutableArray.Create(new ArcFile(fileName, "text"))),
                ArcOutputTests.Problems(DiagnosticDataTests.Variant(message: message)));
        }

        public class CtorTests : TestFixture
        {
            public void KeepsTheFilesAndTheDiagnostics()
            {
                ArcComposition composition = Variant();

                CheckEqual(new ArcFile("A.CodeBehind.cs", "text"), composition.Files.Items.Single());
                CheckEqual(DiagnosticDataTests.Variant(), composition.Diagnostics.Items.Single());
            }
        }

        public class EqualsTests : TestFixture
        {
            public void SameValues_AreEqual()
            {
                CheckTrue(Variant().Equals(Variant()));
                CheckTrue(Variant().Equals((object)Variant()));
            }

            public void Null_IsNotEqual()
            {
                CheckFalse(Variant().Equals((ArcComposition)null));
                CheckFalse(Variant().Equals((object)null));
            }

            public void OtherType_IsNotEqual()
            {
                CheckFalse(Variant().Equals("A"));
            }

            public void DifferentFiles_AreNotEqual()
            {
                CheckFalse(Variant().Equals(Variant(fileName: "B.CodeBehind.cs")));
            }

            public void DifferentDiagnostics_AreNotEqual()
            {
                CheckFalse(Variant().Equals(Variant(message: "Other")));
            }
        }

        public class GetHashCodeTests : TestFixture
        {
            public void EqualCompositions_HaveEqualHashCodes()
            {
                CheckEqual(Variant().GetHashCode(), Variant().GetHashCode());
            }
        }
    }
}