using System;

using NUnit.Framework;
using FluentAssertions;
using Encompass;
using System.Collections.Generic;

namespace Tests
{
    public class EntityRendererTest
    {
        struct AComponent : IComponent { }
        struct BComponent : IComponent { }
        struct CComponent : IComponent { }

        struct TestDrawComponent : IComponent { }

        [Renders(typeof(TestDrawComponent), typeof(AComponent), typeof(BComponent))]
        class TestRenderer : EntityRenderer
        {
            public override void Render(Entity entity) { }
        }

        [Test]
        public void CheckAndTrackEntities()
        {
            var worldBuilder = new WorldBuilder();
            var renderer = worldBuilder.AddEntityRenderer(new TestRenderer());

            AComponent aComponent;
            BComponent bComponent;
            TestDrawComponent testDrawComponent = default(TestDrawComponent);

            var entityToTrack = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityToTrack, aComponent);
            worldBuilder.AddComponent(entityToTrack, bComponent);
            worldBuilder.AddComponent(entityToTrack, testDrawComponent);

            var entityNotToTrack = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityNotToTrack, aComponent);
            worldBuilder.AddComponent(entityNotToTrack, testDrawComponent);

            var entityWithoutDrawComponent = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityWithoutDrawComponent, aComponent);
            worldBuilder.AddComponent(entityWithoutDrawComponent, bComponent);

            var world = worldBuilder.Build();

            world.Update(0.01f);

            Assert.IsTrue(renderer.IsTracking(entityToTrack.ID));
            Assert.IsFalse(renderer.IsTracking(entityNotToTrack.ID));
            Assert.IsFalse(renderer.IsTracking(entityWithoutDrawComponent.ID));
        }

        static bool called = false;
        class DeactivatedRenderer : TestRenderer
        {
            public override void Render(Entity entity)
            {
                called = true;
            }
        }

        static bool calledOnDraw = false;
        static IEnumerable<ValueTuple<Guid, TestDrawComponent>> resultComponents;
        [Renders(typeof(TestDrawComponent), typeof(AComponent), typeof(CComponent))]
        class CalledRenderer : EntityRenderer
        {
            public override void Render(Entity entity)
            {
                resultComponents = GetComponents<TestDrawComponent>(entity);
                calledOnDraw = true;
            }
        }

        [Test]
        public void RenderMethodCalledOnWorldDraw()
        {
            var worldBuilder = new WorldBuilder();
            var renderer = worldBuilder.AddEntityRenderer(new CalledRenderer());

            AComponent aComponent;
            CComponent cComponent;
            TestDrawComponent testDrawComponent;

            var entity = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entity, aComponent);
            worldBuilder.AddComponent(entity, cComponent);
            var testDrawComponentID = worldBuilder.AddDrawComponent(entity, testDrawComponent, 2);

            var world = worldBuilder.Build();

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

            Assert.IsTrue(renderer.IsTracking(entity.ID));
            Assert.IsTrue(calledOnDraw);
            resultComponents.Should().Contain(new ValueTuple<Guid, TestDrawComponent>(testDrawComponentID, testDrawComponent));
        }
    }
}