namespace FoodFactory.Equipment;

using System;
using System.Collections.Generic;
using FoodFactory.Items;

public interface IBeltPortHost
{
  IBeltItemInsertLogic ResolveInsertLogic(IBeltPort port);
}
public class BeltPortHost : IBeltPortHost
{
  private readonly List<(Func<IBeltPort, bool> match, Func<IBeltItemInsertLogic> factory)> _bindings
    = new();

  public BeltPortHost Bind(
    Func<IBeltPort, bool> match,
    Func<IBeltItemInsertLogic> factory)
  {
    _bindings.Add((match, factory));
    return this;
  }
  private HashSet<IBeltPort> _ports = [];
  public IBeltItemInsertLogic? Default;

  /// <summary>
  /// Resolve the insert logic for a port. If no matching bind exists then the default is returned if supplied. Other wise throws an Exception.
  /// </summary>
  /// <param name="port"></param>
  /// <returns></returns>
  /// <exception cref="Exception"></exception>
  public IBeltItemInsertLogic ResolveInsertLogic(IBeltPort port)
  {
    _ports.Add(port);
    foreach (var (match, factory) in _bindings)
    {
      if (match(port))
      {
        return factory();
      }
    }
    if (Default is null)
    {
      throw new Exception($"{nameof(port)} does not have any binding attached that accepts it.");
    }
    return Default;
  }
  public IEnumerable<IBeltPort> GetPorts() => _ports;
}