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

namespace RGB.NET.Core;

/// <inheritdoc cref="AbstractBindable" />
/// <inheritdoc cref="IDecoratable{T}" />
public abstract class AbstractDecoratable<T> : AbstractBindable, IDecoratable<T>
    where T : IDecorator
{
    #region Properties & Fields

    private readonly List<T> _decorators = [];

    /// <inheritdoc />
    public IReadOnlyList<T> Decorators { get; }

    #endregion

    #region Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="AbstractDecoratable{T}"/> class.
    /// </summary>
    protected AbstractDecoratable()
    {
        Decorators = new ReadOnlyCollection<T>(_decorators);
    }

    #endregion

    #region Methods

    /// <inheritdoc />
    public void AddDecorator(T decorator)
    {
        lock (Decorators)
        {
            _decorators.Add(decorator);
            _decorators.Sort((d1, d2) => d1.Order.CompareTo(d2.Order));
        }

        decorator.OnAttached(this);
    }

    /// <inheritdoc />
    public void RemoveDecorator(T decorator)
    {
        lock (Decorators)
            _decorators.Remove(decorator);

        decorator.OnDetached(this);
    }

    /// <inheritdoc />
    public void RemoveAllDecorators()
    {
        IEnumerable<T> decorators;

        lock (Decorators)
            decorators = Decorators.ToList();

        foreach (T decorator in decorators)
            RemoveDecorator(decorator);
    }

    #endregion
}