using NUnit.Framework;
using FluentAssertions;

using System;
using System.Collections.Generic;
using System.Text;

using Encompass;

namespace Tests
{
    public class WorldTest
    {
        struct TestComponent : IComponent { }
        struct TestDrawComponent : IComponent { }

        static List<object> drawOrder = new List<object>();

        [Renders(typeof(TestDrawComponent), typeof(TestComponent))]
        class TestEntityRenderer : EntityRenderer
        {
            public override void Render(Entity entity)
            {
                drawOrder.Add(entity);
            }
        }

        class TestGeneralRenderer : GeneralRenderer
        {
            public override void Render()
            {
                drawOrder.Add(this);
            }
        }

        [TestCase(true)]
        [TestCase(false)]
        public void DrawOrder(bool parallelUpdate)
        {
            drawOrder.Clear();
            
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddEntityRenderer(new TestEntityRenderer());
            var testGeneralRenderer = worldBuilder.AddGeneralRenderer(new TestGeneralRenderer(), 7);

            TestComponent testComponent;
            TestDrawComponent testDrawComponent = default(TestDrawComponent);

            var entity = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entity, testComponent);
            worldBuilder.AddDrawComponent(entity, testDrawComponent, 3);

            TestDrawComponent testDrawComponentTwo = default(TestDrawComponent);

            var entityTwo = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityTwo, testComponent);
            worldBuilder.AddDrawComponent(entityTwo, testDrawComponentTwo, 1);

            TestDrawComponent testDrawComponentThree = default(TestDrawComponent);

            var entityThree = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityThree, testComponent);
            worldBuilder.AddDrawComponent(entityThree, testDrawComponentThree, 5);

            TestDrawComponent testDrawComponentFour = default(TestDrawComponent);

            var entityFour = worldBuilder.CreateEntity();
            worldBuilder.AddComponent(entityFour, testComponent);
            worldBuilder.AddDrawComponent(entityFour, testDrawComponentFour, -5);

            var world = worldBuilder.Build();

            if (parallelUpdate)
            {
                world.ParallelUpdate(0.01);
            }
            else
            {
                world.Update(0.01);
            }

            world.Draw();

            drawOrder.Should().BeEquivalentTo(entityFour, entityTwo, entity, entityThree, testGeneralRenderer);
        }
    }
}