namespace AyCode.Core.Serializers;

/// <summary>
/// Represents a deserialize chain that allows multiple deserializations from the same parsed data.
/// Maintains reference identity for IId objects across chain operations.
/// Implements IDisposable - call Dispose() when done or use 'using' statement.
/// </summary>
public interface IDeserializeChain<T> : IDisposable
{
    /// <summary>
    /// The first deserialized value.
    /// </summary>
    T? Value { get; }

    /// <summary>
    /// Deserialize to another type from the same data.
    /// </summary>
    TResult? ThenDeserialize<TResult>();

    /// <summary>
    /// Populate an existing object from the same data.
    /// Returns this chain for fluent API.
    /// </summary>
    IDeserializeChain<T> ThenPopulate(object target);
}

/// <summary>
/// Empty deserialize chain implementation for null/empty data.
/// </summary>
public sealed class EmptyDeserializeChain<T> : IDeserializeChain<T>
{
    public static readonly IDeserializeChain<T> Instance = new EmptyDeserializeChain<T>();
    
    private EmptyDeserializeChain() { }
    
    public T? Value => default;
    public TResult? ThenDeserialize<TResult>() => default;
    public IDeserializeChain<T> ThenPopulate(object target) => this;
    public void Dispose() { }
}