using System;
using System.Linq;
using zero.Core.Collections;
using zero.Core.Entities;
using zero.Core.Utils;

namespace zero.Core.Options
{
  public class InterceptorOptions : ZeroBackofficeCollection<InterceptorRegistration>, IZeroCollectionOptions
  {
    public void Add<T>(int gravity = 0, Func<Type, bool> canHandle = null) where T : ICollectionInterceptor
    {
      Type type = typeof(T);

      if (canHandle == null)
      {
        canHandle = _ => true;
      }

      Items.Add(new InterceptorRegistration()
      {
        Hash = IdGenerator.Create(),
        Name = type.Name,
        Gravity = gravity,
        CanHandle = canHandle,
        InterceptorType = type
      });
    }

    public void Add<T, TBoxed>(int gravity = 0, Func<Type, bool> canHandle = null) 
      where T : ICollectionInterceptor<TBoxed>
      where TBoxed : ZeroEntity
    {
      Type type = typeof(T);
      Type boxedType = typeof(TBoxed);
      Func<Type, bool> finalCanHandle = requestedType => boxedType.IsAssignableFrom(requestedType) && (canHandle == null || canHandle.Invoke(requestedType));

      Items.Add(new InterceptorRegistration()
      {
        Hash = IdGenerator.Create(),
        Name = type.Name,
        Gravity = gravity,
        CanHandle = finalCanHandle,
        InterceptorType = type,
        IsInterceptorBoxed = true
      });
    }
  }


  public class InterceptorRegistration
  {
    public int Gravity { get; set; }

    public Type InterceptorType { get; set; }

    public string Hash { get; set; }

    public string Name { get; set; }

    public Func<Type, bool> CanHandle { get; set; }

    public bool IsInterceptorBoxed { get; set; }
  }
}