using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using zero.Core.Entities;
using zero.Core.Options;

namespace zero.Core.Blueprints
{
  public class BlueprintService : IBlueprintService
  {
    protected IZeroOptions Options { get; set; }

    protected IReadOnlyCollection<Blueprint> Blueprints { get; set; }


    public BlueprintService(IZeroOptions options)
    {
      Options = options;
      Blueprints = Options.Blueprints.GetAllItems();
    }


    /// <inheritdoc />
    public bool IsEnabled<T>(T model) where T : ZeroEntity => IsEnabled(model.GetType());


    /// <inheritdoc />
    public bool IsEnabled<T>() where T : ZeroEntity => IsEnabled(typeof(T));


    /// <inheritdoc />
    public bool IsEnabled(Type type) => Blueprints.Any(x => x.ContentType.IsAssignableFrom(type));


    /// <inheritdoc />
    public bool TryGetBlueprint<T>(T model, out Blueprint blueprint) where T : ZeroEntity => TryGetBlueprint(model.GetType(), out blueprint);


    /// <inheritdoc />
    public bool TryGetBlueprint<T>(out Blueprint blueprint) where T : ZeroEntity => TryGetBlueprint(typeof(T), out blueprint);


    /// <inheritdoc />
    public bool TryGetBlueprint(Type type, out Blueprint blueprint)
    {
      blueprint = Blueprints.FirstOrDefault(x => x.ContentType.IsAssignableFrom(type));
      return blueprint != null;
    }
  }


  public interface IBlueprintService
  {
    /// <summary>
    /// Check whether blueprinting functionality is enabled for a certain entity
    /// </summary>
    bool IsEnabled<T>() where T : ZeroEntity;

    /// <summary>
    /// Check whether blueprinting functionality is enabled for a certain entity
    /// </summary>
    bool IsEnabled<T>(T model) where T : ZeroEntity;

    bool IsEnabled(Type type);

    bool TryGetBlueprint<T>(T model, out Blueprint blueprint) where T : ZeroEntity;

    bool TryGetBlueprint<T>(out Blueprint blueprint) where T : ZeroEntity;

    bool TryGetBlueprint(Type type, out Blueprint blueprint);
  }
}