using System;
using System.Collections.Generic;
using System.Linq;

namespace Encompass
{
    public abstract class Renderer
    {
        internal EntityManager entityManager;
        internal ComponentManager componentManager;

        internal void AssignEntityManager(EntityManager entityManager)
        {
            this.entityManager = entityManager;
        }

        internal void AssignComponentManager(ComponentManager componentManager)
        {
            this.componentManager = componentManager;
        }

        protected bool EntityExists(Guid entityID)
        {
            return entityManager.EntityExists(entityID);
        }

        protected Entity GetEntity(Guid entityID)
        {
            return entityManager.GetEntity(entityID);
        }

        protected Guid GetEntityIDByComponentID(Guid componentID)
        {
            return componentManager.GetEntityIDByComponentID(componentID);
        }

        protected Entity GetEntityByComponentID(Guid componentID)
        {
            return GetEntity(GetEntityIDByComponentID(componentID));
        }

        protected IEnumerable<ValueTuple<Guid, TComponent>> ReadComponents<TComponent>() where TComponent : struct, IComponent
        {
            return componentManager.GetComponentsByType<TComponent>();
        }

        protected ValueTuple<Guid, TComponent> ReadComponent<TComponent>() where TComponent : struct, IComponent
        {
            return ReadComponents<TComponent>().First();
        }

        protected IEnumerable<ValueTuple<Guid, TComponent>> GetComponents<TComponent>(Entity entity) where TComponent : struct, IComponent
        {
            return componentManager.GetComponentsByEntityAndType<TComponent>(entity.ID);
        }

        protected ValueTuple<Guid, TComponent> GetComponent<TComponent>(Entity entity) where TComponent : struct, IComponent
        {
            return GetComponents<TComponent>(entity).First();
        }

        protected bool HasComponent<TComponent>(Entity entity) where TComponent : struct, IComponent
        {
            return componentManager.EntityHasComponentOfType<TComponent>(entity.ID);
        }

        protected bool SomeComponent<TComponent>() where TComponent : struct, IComponent
        {
            return componentManager.ComponentOfTypeExists<TComponent>();
        }
    }
}