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

namespace Encompass
{
    public struct Entity
    {
        public readonly Guid id;

        private ComponentManager componentManager;

        internal Entity(Guid id, ComponentManager componentManager)
        {
            this.id = id;
            this.componentManager = componentManager;
        }

        public Guid AddComponent<TComponent>(TComponent component) where TComponent : struct, IComponent
        {
            return componentManager.AddComponent<TComponent>(id, component);
        }

        public IEnumerable<KeyValuePair<Guid, TComponent>> GetComponents<TComponent>() where TComponent : struct, IComponent
        {
            return componentManager.GetComponentsByEntityAndType<TComponent>(id);
        }

        public KeyValuePair<Guid, TComponent> GetComponent<TComponent>() where TComponent : struct, IComponent
        {
            return GetComponents<TComponent>().First();
        }

        public bool HasComponent<TComponent>() where TComponent : struct, IComponent
        {
            return componentManager.EntityHasComponentOfType<TComponent>(id);
        }

        internal void RemoveAllComponents()
        {
            componentManager.RemoveAllComponentsFromEntity(id);
        }
    }
}