using NUnit.Framework;

using System;
using System.Collections.Generic;

using Encompass;

namespace Tests
{
    public static class GeneralRendererTest
    {
        struct AComponent : IComponent { }

        public class SingletonRead
        {
            static ValueTuple<Guid, AComponent> result;

            class TestRenderer : GeneralRenderer
            {
                public override void Render()
                {
                    result = ReadComponent<AComponent>();
                }
            }

            [Test]
            public void SingletonComponent()
            {
                var worldBuilder = new WorldBuilder();
                worldBuilder.AddGeneralRenderer(new TestRenderer(), 1);

                AComponent aComponent;

                var entity = worldBuilder.CreateEntity();
                var componentID = entity.AddComponent(aComponent);

                var world = worldBuilder.Build();

                world.Update(0.01f);
                world.Draw();

                Assert.That(result, Is.EqualTo(new ValueTuple<Guid, AComponent>(componentID, aComponent)));
            }

            [Test]
            public void MultipleComponents()
            {
                var worldBuilder = new WorldBuilder();
                worldBuilder.AddGeneralRenderer(new TestRenderer(), 1);

                AComponent aComponent;
                AComponent aComponentTwo;

                var entity = worldBuilder.CreateEntity();
                var componentID = entity.AddComponent(aComponent);
                var componentTwoID = entity.AddComponent(aComponentTwo);
                var world = worldBuilder.Build();

                world.Update(0.01f);

                Assert.Throws<InvalidOperationException>(() => world.Draw());
            }
        }
    }
}