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 : IDrawComponent
        {
            public int Layer { get ; set; }
        }

        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 new int Layer { get { return 9; } }

            public override void Render()
            {
                drawOrder.Add(this);
            }
        }

        [Test]
        public void DrawOrder()
        {
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddRenderer<TestEntityRenderer>();
            var testGeneralRenderer = worldBuilder.AddRenderer<TestGeneralRenderer>();

            TestComponent testComponent;
            TestDrawComponent testDrawComponent = default(TestDrawComponent);
            testDrawComponent.Layer = 3;

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

            TestDrawComponent testDrawComponentTwo = default(TestDrawComponent);
            testDrawComponentTwo.Layer = 1;

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

            TestDrawComponent testDrawComponentThree = default(TestDrawComponent);
            testDrawComponentThree.Layer = 5;

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

            TestDrawComponent testDrawComponentFour = default(TestDrawComponent);
            testDrawComponentFour.Layer = -5;

            var entityFour = worldBuilder.CreateEntity();
            entityFour.AddComponent(testComponent);
            entityFour.AddComponent(testDrawComponentFour);

            var world = worldBuilder.Build();

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

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