using System.Collections.Generic;

namespace Encompass
{
    public class WorldBuilder
    {
        private List<Engine> engines = new List<Engine>();

        private ComponentManager componentManager;
        private EntityManager entityManager;
        private MessageManager messageManager;

        public WorldBuilder()
        {
            componentManager = new ComponentManager();
            entityManager = new EntityManager(componentManager);
            messageManager = new MessageManager();
        }

        public Entity CreateEntity()
        {
            return this.entityManager.CreateEntity();
        }

        public Engine AddEngine<TEngine>() where TEngine : Engine, new()
        {
            var engine = new TEngine();

            engine.AssignEntityManager(this.entityManager);
            engine.AssignComponentManager(this.componentManager);
            engine.AssignMessageManager(this.messageManager);

            engines.Add(engine);

            return engine;
        }

        public World Build()
        {
            var world = new World(
                this.engines,
                this.entityManager,
                this.componentManager,
                this.messageManager
            );

            this.componentManager.ActivateComponents();
            this.componentManager.RemoveComponents();

            return world;
        }
    }
}